Forecast Discussions mentioning "ACARS", "MDCRS", "AIRCRAFT", "TAMDAR", or "AMDAR" received at FSL on 01/23/07


AREA FORECAST DISCUSSION...UPDATED
NWS MOUNT HOLLY NJ
AFDPHI 550 PM EST MON JAN 22 2007

RADAR IS SHOWING, AND OBSERVATION HERE AT MT HOLLY IS CONFIRMING, THAT SCATTERED SNOW FLURRIES HAVE BROKEN OUT IN ADVANCE OF THE SHORT WAVE APPROACHING FROM THE CENTRAL GREAT LAKES REGION THIS EVENING. WE HAVE ADDED FLURRIES TO MOST OF THE REGION FOR TONIGHT. NO OTHER CHANGES. PREV AFD IS BELOW.

&&

.PHI WATCHES/WARNINGS/ADVISORIES... PA...NONE. NJ...NONE. DE...NONE. MD...NONE. MARINE...NONE.

&&

$$

MPD

********************************************************************

.OVERVIEW...

WINTER IS HERE AND WILL HANG AROUND FOR AWHILE.

.SHORT TERM/TONIGHT THROUGH WEDNESDAY NIGHT/...

PLENTY OF DANK AND DREARY LOOKING CLOUDS AROUND THE REGION WHICH WILL STAY AROUND FOR A COUPLE OF DAYS. NOT MUCH IN THE WAY OF WIND BUT WHEN TEMPERATURES ARE IN THE 20S, DOESN`T TAKE MUCH TO COOL YOU DOWN EVEN MORE. SO WHEN IS THE NEXT TIME FOR PRECIPITATION? THE NORTHERN BRANCH WILL PREVAIL OVER A GOOD PART OF THE WORKWEEK. SOME OF THE COLDEST TEMPERATURES WILL BE WEDNESDAY INTO THURSDAY WITH A -18C AT 80H. JUST UP THE ROAD A SHORT DISTANCE A -26C IS OVER NEW YORK STATE. THE LOW THAT BROUGHT SNOW TO US ON SUNDAY IS OFF THE COAST AND PULLING DOWN SOME COLD AIR, BUT ITS THE NEXT SHORT WAVE OVER JAMES BAY THAT IS GOING TO PUSH SOUTHEAST AND BRING THE REINFORCED COLD. ANY PRECIPITATION LIKELY TO BE IN THE FORM OF LIGHT SNOW OR A PASSING SNOW SHOWER AND THAT COULD OCCUR AT ANY TIME WITH NO ORGANIZED DYNAMICS TO SET ANYTHING OFF EXCEPT OFF THE GREAT LAKES. SO WE`LL CONTINUE TO A NORTHWEST FLOW COLD TEMPERATURES AND MOSTLY CLOUDY SKIES INTO WEDNESDAY NIGHT. MEANWHILE, CLOSED LOW OVER OLD MEXICO WILL REMAIN ANCHORED TO THE SOUTHERN IN THE TAIL END OF THE SOUTHERN BRANCH.

.LONG TERM/THURSDAY THROUGH MONDAY/...

WE CONTINUE IN THE SAME PATTERN FOR THE EXTENDED PERIOD AND IT IS EVEN COLDER THAN THE SHORT TERM. A NICE PIPE LINE OF REINFORCED COLD AIR SETS UP FROM EDMONTON DOWN THROUGH THE MID ATLANTIC COAST. ALTHOUGH COLD, THIS PATTERN WILL NOT SUPPORT THE DEVELOPMENT OF A MAJOR STORM. THE COLDEST DAY THIS WEEK LOOKS LIKE FRIDAY WITH THE NEXT SHOT OF COLD AIR. ABOUT THE THE ONLY THING WE CAN HOPE FOR IN THE WAY OF SNOW IS A CLIPPER OR TWO TO DROP ABOUT 4 TO 5 INCHES IN A FELLED SWOOP OVER OUR SOUTHERN ZONES. OUR EXTENDED PERIOD FOR 27 JAN THROUGH FEB 4 IS FOR BELOW NORMAL TEMPERATURES AND NEAR NORMAL PRECIPITATION. WHAT THIS PATTERN DOES DO IN THE LONG TERM IS SET THE STAGE, WITH THE COLD AIR IN PLACE, FOR A LOW TO DEVELOP OVER THE NORTHERN GULF AND THEN TRACK UP THROUGH THE APPALACHIANS WITH SECONDARY DEVELOPMENT OVER THE CAROLINAS. BUT THAT IS NOT IN THE FORESEEABLE FUTURE OF THE MODELS. JUST ENJOY THE SEASONABLE COLD, STAY WARM AND FOR THOSE HOPING FOR SNOW, IT WILL HAPPEN.

&& .AVIATION... THE MAJORITY OF THE TERMINALS HAVE BEEN STUCK IN THE IFR TO MVFR RANGE, HOWEVER SOME IMPROVEMENT HAS TAKEN PLACE EARLY THIS AFTERNOON AS SOMEWHAT DRIER AIR IS WORKING ITS WAY DOWN. SOME PILOT REPORTS THOUGH INDICATE MODERATE TO SEVERE ICING IN THE KABE VICINITY AT 6,000-8,000 FEET. EARLIER ACARS DATA AT PHILADELPHIA SHOWED A FAIRLY SHALLOW LAYER OF SATURATION AND THE 12Z LWX RAOB INDICATED THE MOISTURE WAS MOSTLY BELOW 5,000 FEET. VISIBLE SATELLITE IMAGERY AND SURFACE OBS SHOW A WEALTH OF CLOUDS ACROSS THE MID ATLANTIC. HOWEVER, SOME BREAKS DEVELOPED IN NORTHERN VIRGINIA. THE MAIN FORECAST CHALLENGE IS THE EXTENT OF ANY LOW-LEVEL DRYING TONIGHT INTO TUESDAY. FORECAST SOUNDINGS INDICATE NOT MUCH MIXING WITHIN THE LOWER PORTION OF THE BOUNDARY LAYER DESPITE AN INCREASING PRESSURE GRADIENT. IT APPEARS THE EXTENT OF THE MOIST LAYER HAS DECREASED THIS AFTERNOON WITH SEVERAL AREAS SEEING CEILINGS COME UP. ORGINALLY THOUGHT MOISTURE WOULD HANG TOUGH, WHICH IT HAS BUT CEILINGS ARE NOW RESPONDING IN THE UPSWING DIRECTION AT MANY LOCATIONS. NOT VERY CONFIDENT THAT THIS WILL HOLD OVERNIGHT, THEREFORE DID NOT WANT TO BE TOO OPTIMISTIC. GENERALLY HELD ONTO IFR TO MVFR CONDITIONS OVERNIGHT AS THERE IS A SHORT WAVE THAT IS FORECAST TO CRUISE ACROSS THE AREA TONIGHT, KEEPING CLOUDS IN PLACE. AREAS THAT SEE CEILINGS LIFTING SOME THIS AFTERNOON, MAY TEND TO LOWER AGAIN TONIGHT WITH THE LOW-LEVEL MOISTURE IN PLACE. THERE IS AN INCREASING PRESSURE GRADIENT OVERNIGHT, HOWEVER SURFACE WINDS MAY NOT RESPOND MUCH. WE IMPROVED THINGS THOUGH TUESDAY MORNING AS BETTER MIXING SHOULD ALLOW SOME DRYING TO TAKE PLACE. THERE COULD BE A FEW SNOW SHOWERS TONIGHT IN THE KABE AND KRDG VICINITY, WITH SOME FLURRIES POSSIBLY DOWN TO A KTTN-KILG LINE AS THE SHORT WAVE MOVES THROUGH. HOWEVER DID NOT CARRY ANY LIGHT PRECIPITATION IN THE 18Z TAFS.

&&

.MARINE... CONDITIONS RATHER TRANQUIL ACROSS THE AREA WATERS TODAY WITH SEAS 2 FEET OR LESS OVER THE COASTAL WATERS AND ABOUT A FOOT ON DELAWARE BAY. WINDS HAVE BEEN ABOUT 10 KNOTS OR LESS SO FAR. LOW PRESSURE WELL OFF THE NORTH CAROLINA COAST THIS AFTERNOON WILL CONTINUE TO MOVE NORTHEASTWARD TONIGHT WELL EAST OF OUR AREA. HOWEVER AS THIS SYSTEM MOVES TO OUR EAST THEN NORTHEAST, THE PRESSURE GRADIENT WILL TIGHTEN UP SOME OVERNIGHT AND DURING THE DAY ON TUESDAY. BUFKIT SOUNDINGS INDICATE GUSTS UP TO 25 KNOTS ARE POSSIBLE STARTING LATE TONIGHT AND CONTINUING INTO TUESDAY EVENING. FOR NOW WE WILL ALLOW FOR GUSTS TO APPROACH 25 KNOTS AND HOLD OFF ON A SMALL CRAFT ADVISORY. SOME WEAK SURFACE RIDGING MOVES IN TUESDAY EVENING, WHICH SHOULD DIMINISH THE WINDS A BIT. A STRONG COLD FRONT IS FORECAST TO APPROACH THE WATERS WEDNESDAY, THEN SWEEP ACROSS EARLY WEDNESDAY EVENING. STRONG CAA COUPLED WITH A TIGHTENING PRESSURE GRADIENT AS LOW PRESSURE DEEPENS NEAR NOVA SCOTIA WILL PRODUCE GUSTY WINDS OVER THE MARINE AREA. BUFKIT PROFILES INDICATE 30-KNOT GUSTS POSSIBLE WEDNESDAY NIGHT AND THURSDAY. AS THE CORE OF THE COLD AIR DROPS DOWN THURSDAY NIGHT AND FRIDAY, PLENTY OF WIND ALOFT COUPLED WITH COLD AIR POURING OVER THE RELATIVELY MILD WATER COULD PRODUCE GALE FORCE GUSTS. FOR THURSDAY NIGHT AND FRIDAY WAVEWATCH INDICATING 7 FOOT SEAS AT BUOY 44009. WITH THE FLOW EXPECTED TO BE OFFSHORE, WE WILL TOP THE SEAS AT ABOUT 5-6 FEET.

&&

$$

OVERVIEW/SHORT/LONG TERM...EBERWINE AVIATION/MARINE...GORSE


AREA FORECAST DISCUSSION
NWS CHICAGO/ROMEOVILLE IL
AFDLOT 1145 AM CST SUN JAN 21 2007

.DISCUSSION... 345 AM CST

RADAR SHOWS THE SNOW MOVING INTO NORTHEAST ILLINOIS AND NORTHWEST INDIANA. THE 700 MB OMEGA FIELD AND 700 TO 500 MB LAYER Q VECTOR FIELD SHOW THE MAXIMUM LIFT AROUND 15 UTC. THIS IS FROM THE LOCALLY RUN WRF ARW MODEL. THE 00 UTC SOUNDINGS AT ILX AND DVN WERE DRY FROM 955 TO 584 MB. BUT THEY SHOULD HAVE INCREASE MOISTURE IN THAT LAYER BY 09 UTC THIS MORNING. THE FORECAST SOUNDING FROM THE GFS AND NAM MODELS SHOW THE MAXIMUM DEPTH OF SATURATION FROM 5 AM TO 7 AM THIS MORNING. THEN THE DRIER AIR ABOVE 500 MB MOVES IN AFTER 11 AM. SNOW PRODUCTION IS STILL SEEN THROUGH 6 PM CST. WE WILL KEEP THE ADVISORY FOR SNOW UNTIL 6 PM CST. A CIRCULATION IS SEEN ON THE 700 MB PROFILER DATA OVER SOUTHWEST NEBRASKA AND NORTHEAST COLORADO AT 07 UTC. THIS CIRCULATION IS FORECAST TO REACH NORTHERN LAKE MICHIGAN BY 00 UTC MONDAY. THE ACARS WIND SPEED SHOWS THE JET OVER ILLINOIS TO NORTHERN OHIO AT 945 UTC. THERE WILL BE A LOT OF DIVERGENCE ALOFT FOR THE NEXT SEVERAL HOURS.

WE MADE SOME SLIGHT ADJUSTMENTS ON THE SNOW AMOUNTS AND HIGH AND LOW TEMPERATURES TODAY AND TONIGHT. MADE A FEW ADJUSTMENTS ON PRECIPITATION OVER LAKE MICHIGAN AND OUR FORECAST AREA FOR WEDNESDAY. A SHORT WAVE WILL MOVE ACROSS NORTHERN ILLINOIS AND WISCONSIN MONDAY. WILL KEEP A CHANCE OF LIGHT SNOW SHOWERS ON THAT DAY.

&&

.AVIATION... 1145 AM CST

FOR 18Z TAFS...DEFORMATION ZONE PRECIPITATION BAND MAINLY ACROSS WISCONSIN AND LAKE MI ATTM...EXITING FAR NORTHERN IL. ANOTHER PATCH OF PRECIPITATION SHOWING UP ON RADAR OVER EASTERN IA AND NW IL ASSOCIATED WITH VORT MAX. VORT MAX BEST SEEN ON WATER VAPOR SATELLITE LOOP AND IS MOVING RAPIDLY NE OVER NW IL. THE PRECIPITATION THAT REMAINS OVER NE IL/NW IN LATE THIS MORNING IS A MIX OF LIGHT SNOW AND FREEZING DRIZZLE. THIS SUPPORTED BY 12Z SOUNDING FROM DVN WHICH WAS MOIST UP TO ABOUT 12K FT BUT TEMPERATURE OF THE MOIST COLUMN WAS AROUND -8C WHICH IS ON THE THRESHOLD OF ICE CRYSTALS VERSUS SUPERCOOLED WATER. WILL KEEP INTERMITTENT LIGHT SNOW AND FREEZING DRIZZLE GOING FOR A FEW HOURS AND END ALL PRECIP BY LATE AFTERNOON. VISIBILITY SHOULD GRADUALLY IMPROVE AS PRECIPITATION WINDS DOWN BUT DONT EXPECT ANY BIG IMPROVEMENT UNTIL SURFACE WAVE PASSES AND WINDS BECOME MORE NORTHERLY TONIGHT.

ALLSOPP &&

.LOT WATCHES/WARNINGS/ADVISORIES... .IL...NONE. .IN...NONE. .LM...NONE.

&&

$$


AREA FORECAST DISCUSSION
NWS CHICAGO/ROMEOVILLE IL
AFDLOT 545 AM CST SUN JAN 21 2007

.DISCUSSION... 345 AM CST

RADAR SHOWS THE SNOW MOVING INTO NORTHEAST ILLINOIS AND NORTHWEST INDIANA. THE 700 MB OMEGA FIELD AND 700 TO 500 MB LAYER Q VECTOR FIELD SHOW THE MAXIMUM LIFT AROUND 15 UTC. THIS IS FROM THE LOCALLY RUN WRF ARW MODEL. THE 00 UTC SOUNDINGS AT ILX AND DVN WERE DRY FROM 955 TO 584 MB. BUT THEY SHOULD HAVE INCREASE MOISTURE IN THAT LAYER BY 09 UTC THIS MORNING. THE FORECAST SOUNDING FROM THE GFS AND NAM MODELS SHOW THE MAXIMUM DEPTH OF SATURATION FROM 5 AM TO 7 AM THIS MORNING. THEN THE DRIER AIR ABOVE 500 MB MOVES IN AFTER 11 AM. SNOW PRODUCTION IS STILL SEEN THROUGH 6 PM CST. WE WILL KEEP THE ADVISORY FOR SNOW UNTIL 6 PM CST. A CIRCULATION IS SEEN ON THE 700 MB PROFILER DATA OVER SOUTHWEST NEBRASKA AND NORTHEAST COLORADO AT 07 UTC. THIS CIRCULATION IS FORECAST TO REACH NORTHERN LAKE MICHIGAN BY 00 UTC MONDAY. THE ACARS WIND SPEED SHOWS THE JET OVER ILLINOIS TO NORTHERN OHIO AT 945 UTC. THERE WILL BE A LOT OF DIVERGENCE ALOFT FOR THE NEXT SEVERAL HOURS.

WE MADE SOME SLIGHT ADJUSTMENTS ON THE SNOW AMOUNTS AND HIGH AND LOW TEMPERATURES TODAY AND TONIGHT. MADE A FEW ADJUSTMENTS ON PRECIPITATION OVER LAKE MICHIGAN AND OUR FORECAST AREA FOR WEDNESDAY. A SHORT WAVE WILL MOVE ACROSS NORTHERN ILLINOIS AND WISCONSIN MONDAY. WILL KEEP A CHANCE OF LIGHT SNOW SHOWERS ON THAT DAY.

&&

.AVIATION... 545 AM CST

12Z TAFS...DRY SLOT SLICING NORTH-NORTHEASTWARD ACROSS WESTERN IL CAUSING A SPLIT IN THE PRECIPITATION ACROSS THE AREA. MAIN THRUST OF THE DEEP MOIST LIFT PUSHING OFF ACROSS THE OH VALLEY AND TOWARDS THE LOWER LAKES. UPPER LOW CURRENTLY IN EASTERN NEB WITH DEFORMATION ZONE SNOW NORTH AND NORTHEAST OF CIRCULATION IS MOVING FM IA AND SOUTHERN MN INTO SRN WI.

BRIEF SHOT OF ACCUMULATING SNOW QUICKLY COMMING TO AN END BEFORE DAYBREAK. UVV CONTINUES IN LOW LEVEL MOISTURE AS SURFACE LOW IN EASTERN KS MOVS INTO WEST CENTRAL IL THIS AFTERNOON SO EXPECT HIGH END IFR/LOW END MVFR CIGS AND OCCASIONAL VERY LIGHT SN. AS VORT MAX MOVS ACROSS NORTHERN IL LATER AFTERNOON MAY SEE A LITTLE MORE VIGEROUS SNOW/SNOW SHOWERS...ENDING AROUND 00Z. E TO SE WINDS WILL PERSIST UNTIL THE SURFACE LOW CROSSES INTO NORTHERN IND EARLY THIS EVE...THEN WILL BACK AROUND THRU NE TO NW. WITH WEAK FLOW THRU THE NIGHT EXPECT MVFR STRATOCU CIGS TO HOLD ACROSS REGION TIL AFT 12Z.

TRS

&&

.LOT WATCHES/WARNINGS/ADVISORIES... .IL...SNOW ADVZY 3AM TO 6PM SUNDAY. .IN...SNOW ADVZY 3AM TO 6PM SUNDAY. .LM...NONE.

&&

$$


AREA FORECAST DISCUSSION
NWS CHICAGO/ROMEOVILLE IL
AFDLOT 345 AM CST SUN JAN 21 2007

.DISCUSSION...

RADAR SHOWS THE SNOW MOVING INTO NORTHEAST ILLINOIS AND NORTHWEST INDIANA. THE 700 MB OMEGA FIELD AND 700 TO 500 MB LAYER Q VECTOR FIELD SHOW THE MAXIMUM LIFT AROUND 15 UTC. THIS IS FROM THE LOCALLY RUN WRF ARW MODEL. THE 00 UTC SOUNDINGS AT ILX AND DVN WERE DRY FROM 955 TO 584 MB. BUT THEY SHOULD HAVE INCREASE MOISTURE IN THAT LAYER BY 09 UTC THIS MORNING. THE FORECAST SOUNDING FROM THE GFS AND NAM MODELS SHOW THE MAXIMUM DEPTH OF SATURATION FROM 5 AM TO 7 AM THIS MORNING. THEN THE DRIER AIR ABOVE 500 MB MOVES IN AFTER 11 AM. SNOW PRODUCTION IS STILL SEEN THROUGH 6 PM CST. WE WILL KEEP THE ADVISORY FOR SNOW UNTIL 6 PM CST. A CIRCULATION IS SEEN ON THE 700 MB PROFILER DATA OVER SOUTHWEST NEBRASKA AND NORTHEAST COLORADO AT 07 UTC. THIS CIRCULATION IS FORECAST TO REACH NORTHERN LAKE MICHIGAN BY 00 UTC MONDAY. THE ACARS WIND SPEED SHOWS THE JET OVER ILLINOIS TO NORTHERN OHIO AT 945 UTC. THERE WILL BE A LOT OF DIVERGENCE ALOFT FOR THE NEXT SEVERAL HOURS.

WE MADE SOME SLIGHT ADJUSTMENTS ON THE SNOW AMOUNTS AND HIGH AND LOW TEMPERATURES TODAY AND TONIGHT. MADE A FEW ADJUSTMENTS ON PRECIPITATION OVER LAKE MICHIGAN AND OUR FORECAST AREA FOR WEDNESDAY. A SHORT WAVE WILL MOVE ACROSS NORTHERN ILLINOIS AND WISCONSIN MONDAY. WILL KEEP A CHANCE OF LIGHT SNOW SHOWERS ON THAT DAY.

&&

.AVIATION...

06Z TAFS...STILL HOLDING ONTO TIMETABLE FOR UPCOMING SNOW EVENT. THIS SHORTWAVE STILL EXPECTED TO MOVE IN BEFORE DAWN. CI OVERHEAD NOW...LOWERING TO AC AFT MIDNGT. STILL LOOKING LIKE A PRE-DAWN ENTRY INTO NRN IL FOR SNOWFALL. SNOW INCREASING IN COVERAGE AND INTENSITY TOWARD MID MRNG WITH BEST VERTICAL MOTION IN THE LATE MORNING AND EARLY AFTERNOON HRS. HAVE LOWERED CIGS AND VSBY TO IFR TO REFLECT THIS HEAVY PERIOD. CUD BE PDS OF LESS THAN 1/2 MILE AROUND THE NOON HOUR BUT HAVE NOT REFLECTED THIS IN TERMINAL FCSTS FOR ITS SHUTDOWN CAPABILITY. SNOW LESSENING AFT 2PM AND SHUD SEE VSBY LIFTING TO MVFR AFT THEN...ALTHO CIGS STILL IFR THRU 06Z IN CAA WRAPAROUND. WINDS GENERALLY SE TONGHT BACKING TO EAST IN THE LT MRNG AND SHUD BACK TO NORTHEAST TO NORTH AFT DARK SUNDAY EVENING.

RLB

&&

.LOT WATCHES/WARNINGS/ADVISORIES... .IL...SNOW ADVZY 3AM TO 6PM SUNDAY. .IN...SNOW ADVZY 3AM TO 6PM SUNDAY. .LM...NONE.

&&

$$


AREA FORECAST DISCUSSION
NWS LOUISVILLE KY
AFDLMK 930 PM EST MON JAN 22 2007

.EVENING UPDATE...

UPDATED ZONES TO TAKE OUT EVENING WORDING. LOWERED DEWPOINTS AND TEMPERATURES ACROSS THE NORTH HALF OF CWA TO REFLECT LATEST OBS. EARLIER...SOME LIGHT SLEET WAS REPORTED ACROSS CENTRAL KENTUCKY. RADAR RETURNS HAVE DIMINISHED CONSIDERABLY AND ASIDE FROM A FEW STRAY FLURRIES OR AN ICE PELLET...HAVE REMOVED POPS FROM THE FORECAST. EXTENSIVE LOW CLOUDS CONTINUE WEST ALL THE WAY THROUGH ILLINOIS. ANY CLEARING WILL HAVE TO WAIT UNTIL TOMORROW AFTERNOON AT THE EARLIEST.

.AVIATION (00Z TAFS)...

EXTENSIVE LOW STRATUS WILL CONTINUE OVERNIGHT THROUGH THE MORNING HOURS TUESDAY. PATCHY DRIZZLE OR FLURRIES MAY BRIEFLY REDUCE VISIBILITIES TO BELOW 5SM THIS EVENING. CEILINGS WILL REMAIN MVFR AND VARY BETWEEN 1 AND 1.5 THOUSAND FEET OVERNIGHT...BUT PERHAPS LOWER CLOSER TO ONE THOUSAND FEET AT LEX...DUE TO NORTHWEST FLOW AND HIGHER ELEVATION. SURFACE WINDS WILL REMAIN WEST NORTHWEST AT 5 TO 10 MPH OVERNIGHT..WITH 15-20 MPH WEST NORTHWEST WINDS AT 2000 FEET. DUE TO STRONG INVERSION AT 5000 FEET...LOW CLOUDS WILL BE SLOW TO ERODE...BUT MAY BECOME SCATTERED TUESDAY AFTERNOON. JSD

.SHORT TERM (TONIGHT-TUESDAY)...

EXTENSIVE LOW CLOUDS OVER THE ENTIRE OHIO VALLEY REGION TODAY. THIS COUPLED WITH WEAK COLD ADVECTION HAS LED TO STEADY OR SLOWLY FALLING TEMPS TODAY...IN THE MID-UPPER 30S MOST PLACES AS OF 19Z. SCT PRECIP ON RADAR...AND BASED ON SPOTTER REPORTS COUPLED WITH ACARS DATA... PTYPE IS A MIX OF -RA/-SN/-PL...BUT INTENSITIES ARE VERY LIGHT. EXPECT THIS TO CONTINUE FOR THE REMAINDER OF THE AFTN HOURS.

FCST SOUNDINGS SHOW LOW LEVEL LAPSE RATES STEEPENING INTO THE EVENING HOURS. THIS ALONG WITH LIFT FROM PASSING UPPER TROF WILL HELP CONTINUE POTENTIAL FOR PRECIP THIS EVENING...WILL WORD AS SLIGHT CHANCE OF -SHRA/-SHSN...HOWEVER AIRMASS ABOVE 800MB (ICE CRYSTAL LEVELS) IS FCST TO REMAIN ON THE DRY SIDE...SO PRECIP AMTS SHOULD BE LIGHT AND WE MAY END UP SEEING MORE OF A PATCHY LIGHT DRIZZLE/FLURRY TYPE DEAL. WILL MENTION ISLTD SLICK SPOTS POSSIBLE IN THE HWO FOR TONIGHT AND EARLY TUESDAY MORNING.

CHANCES FOR PRECIP SHOULD DIMINISH AFTER 6Z AS UPPER WAVE PASSES OFF TO THE EAST...BUT SKIES WILL REMAIN CLOUDY PER NAM/GFS FCST SOUNDINGS. BOTH SHOW CLOUD COVER DIMINISHING TUESDAY AS DRIER AIR ADVECTS IN FROM THE W/SW...WHICH IS OBSERVED IN VISIBLE SATELLITE OVER AR/OK ATTM. HOWEVER THAT MAY BE DELAYED DUE TO VERY STRONG INVERSION SEEN AROUND 850MB. OVERALL WILL TREND TOWARD PARTLY CLOUDY WORDING IN THE AFTN TUESDAY.

REGARDING TEMPS...USED A 50/50 BLEND OF NAM/GFS TEMPS WHICH YIELDED MIDDLE 20S MOST LOCATIONS FOR LOWS TONIGHT...AND UPPER 30S/LOWER 40S FOR HIGHS TUESDAY.

CS

.LONG TERM (TUESDAY NIGHT-MONDAY)...

TUES NIGHT-WED NIGHT...

THIS PERIOD BEGINS WITH THE UPPER FLOW PATTERN MAINLY ZONAL/SLIGHTLY NW. AT THE SFC...LOW PRESSURE AND ASSOCIATED FRONT EXTEND FROM HUDSON BAY SW TO SRN GREAT LAKES. A SHORTWAVE EMBEDDED IN WNW FLOW ALOFT IS LOCATED ACROSS THE NRN PLAINS. AT THIS TIME...THINK THE SFC FRONT FROM THE GREAT LAKES MAY STAY TO OUR NE FOR THE MOST PART...AND ONLY BRING A SLIGHT WIND SHIFT TO THE AREA WED MORNING. HOWEVER TIME-HEIGHT CROSS SECTIONS ACROSS OUR NE FROM THE NAM AND GFS INDICATE DEEPER MOISTURE FROM 06-12Z...EXTENDING INTO THE -5 TO -15 DEGREE C RANGE. THINK THAT ONLY TRACE AMOUNTS OF PRECIP WOULD OCCUR (IN THE FORM OF FLURRIES) SO MAY INSERT THIS INTO THE GRIDS. THINK A BETTER CHANCE RESIDES WITH THE UPPER PLAINS` SHORTWAVE DIVING SEWD ACROSS THE CWA WED NIGHT. THIS MAY HELP SPARK A FEW LIGHT SHOWERS ACROSS THE AREA...WITH THE BEST CHANCE ACROSS THE NERN CWA. THINK SLT CHC SNOW SHOWERS SHOULD DO THE TRICK. ANY PRECIP WOULD BE LIGHT IN NATURE.

THU-FRI...

THIS PERIOD WILL BE MAINLY DRY AS UPPER TROUGH MOVES OFF TO THE NE AND SFC HIGH PRESSURE TRIES TO NOSE IN FROM THE WEST. STILL A NW FLOW ALOFT WILL BE PRESENT ACROSS THE REGION...AND MAY HAVE SOME LINGERING FLURRIES ACROSS OUR NE THU MORN. WOULD BE A MINIMAL SHOT SO WILL NOT INSERT INTO GRIDS AT THIS TIME. MODELS HAVE BEEN TRENDING CLOSER TO THE ECMWF...WHICH HAS BEEN THE MOST CONSISTENT MODEL DOWNPLAYING THE SOUTHWARD ADVANCEMENT OF ARCTIC AIR. STILL...THINK TEMPS WILL HAVE A HARD TIME GETTING OUT OF THE 30S FOR THU UNDER THE NW FLOW (ESPECIALLY ACROSS OUR NE). TEMPS SHOULD SLOWLY MODERATE ON FRI...WITH VALUES CLOSER TO NORMAL.

SAT-MON...

THIS PERIOD POSES THE MOST UNCERTAINTY...HOWEVER FORECASTER CONFIDENCE INCREASING DUE TO THE CONSISTENCY WITH THE ECMWF. AT THE BEGINNING OF THIS PERIOD...UPPER FLOW ALOFT IS STILL A WNW FLOW...WITH A CUT-OFF LOW OVER THE SWRN CONUS FINALLY EJECTING INTO THE SRN PLAINS. MODERATING TEMPS CONTINUE WITH SWRLY SFC WINDS AND SLT RIDGING OVERHEAD. A SFC LOW IS LOCATED OVER THE GREAT LAKES REGION SAT MORN...WITH SWWD EXTENDING FRONT. THIS FRONT WILL LIKELY PASS THROUGH THE REGION SATURDAY...WHILE AT THE SAME TIME UPPER LOW EJECTING INTO PLAINS TRAVELS JUST TO OUR SOUTH. A COMBINATION OF THESE POSES A SLT PRECIP THREAT FOR THE AREA...HOWEVER QPF AMOUNTS LOOK VERY LIGHT AT THIS POINT SINCE OUR CWA RESIDES IN THE MIDDLE OF THE TWO NRN AND SRN STREAMS. WILL JUST CARRY SLT CHC POPS...AND WOULD LIKELY START OFF AS LIQUID. SAT NIGHT...PRECIP SHOULD SWITCH TO -SHSN AS TEMPS AT 850MB DROP TO AROUND -12 DEGREES C. UPPER TROUGH BEHIND NRN STREAM FRONT TRIES TO BRING ARCTIC AIR INTO THE REGION...HOWEVER TREND IS TO LIGHTEN THE PUNCH...WITH THE NE CONUS REALLY EXPERIENCING THE WORST OF THE ARCTIC AIR. COULD HAVE A CHC OF FLURRIES WITH THE UPPER TROUGH PASSAGE...BUT GIVEN VERY DRY ATMS WILL NOT INSERT INTO THE GRIDS FOR SUNDAY AT THIS TIME. DESPITE THE MODELS TRENDING TOWARD KEEPING THE COLDEST TEMPS TO OUR NE...ENSEMBLES STILL SHOW TEMPS 1 STD DEV BELOW NORM SUN-MON...SO WILL TREND TOWARD ROUGHLY 3-5 DEGREES BELOW NORMAL FOR THESE DAYS.

AL

&&

.AVIATION (00Z TAFS)...

EXTENSIVE LOW STRATUS WILL CONTINUE OVERNIGHT THROUGH THE MORNING HOURS TUESDAY. PATCHY DRIZZLE OR FLURRIES MAY BRIEFLY REDUCE VISIBILITIES TO BELOW 5SM THIS EVENING. CEILINGS WILL REMAIN MVFR AND VARY BETWEEN 1 AND 1.5 THOUSAND FEET OVERNIGHT...BUT PERHAPS LOWER CLOSER TO ONE THOUSAND FEET AT LEX...DUE TO NORTHWEST FLOW AND HIGHER ELEVATION. SURFACE WINDS WILL REMAIN WEST NORTHWEST AT 5 TO 10 MPH OVERNIGHT..WITH 15-20 MPH WEST NORTHWEST WINDS AT 2000 FEET. DUE TO STRONG INVERSION AT 5000 FEET...LOW CLOUDS WILL BE SLOW TO ERODE...BUT MAY BECOME SCATTERED TUESDAY AFTERNOON. JSD

&&

.LMK WATCHES/WARNINGS/ADVISORIES... KY...NONE. IN...NONE.

&&

$$


AREA FORECAST DISCUSSION
NWS LOUISVILLE KY
AFDLMK 610 PM EST MON JAN 22 2007

.AVIATION...

EXTENSIVE LOW STRATUS WILL CONTINUE OVERNIGHT THROUGH THE MORNING HOURS TUESDAY. PATCHY DRIZZLE OR FLURRIES MAY BRIEFLY REDUCE VISIBILITIES TO BELOW 5SM THIS EVENING. CEILINGS WILL REMAIN MVFR AND VARY BETWEEN 1 AND 1.5 THOUSAND FEET OVERNIGHT...BUT PERHAPS LOWER CLOSER TO ONE THOUSAND FEET AT LEX...DUE TO NORTHWEST FLOW AND HIGHER ELEVATION. SURFACE WINDS WILL REMAIN WEST NORTHWEST AT 5 TO 10 MPH OVERNIGHT..WITH 15-20 MPH WEST NORTHWEST WINDS AT 2000 FEET. DUE TO STRONG INVERSION AT 5000 FEET...LOW CLOUDS WILL BE SLOW TO ERODE...BUT MAY BECOME SCATTERED TUESDAY AFTERNOON. JSD

.SHORT TERM (TONIGHT-TUESDAY)...

EXTENSIVE LOW CLOUDS OVER THE ENTIRE OHIO VALLEY REGION TODAY. THIS COUPLED WITH WEAK COLD ADVECTION HAS LED TO STEADY OR SLOWLY FALLING TEMPS TODAY...IN THE MID-UPPER 30S MOST PLACES AS OF 19Z. SCT PRECIP ON RADAR...AND BASED ON SPOTTER REPORTS COUPLED WITH ACARS DATA... PTYPE IS A MIX OF -RA/-SN/-PL...BUT INTENSITIES ARE VERY LIGHT. EXPECT THIS TO CONTINUE FOR THE REMAINDER OF THE AFTN HOURS.

FCST SOUNDINGS SHOW LOW LEVEL LAPSE RATES STEEPENING INTO THE EVENING HOURS. THIS ALONG WITH LIFT FROM PASSING UPPER TROF WILL HELP CONTINUE POTENTIAL FOR PRECIP THIS EVENING...WILL WORD AS SLIGHT CHANCE OF -SHRA/-SHSN...HOWEVER AIRMASS ABOVE 800MB (ICE CRYSTAL LEVELS) IS FCST TO REMAIN ON THE DRY SIDE...SO PRECIP AMTS SHOULD BE LIGHT AND WE MAY END UP SEEING MORE OF A PATCHY LIGHT DRIZZLE/FLURRY TYPE DEAL. WILL MENTION ISLTD SLICK SPOTS POSSIBLE IN THE HWO FOR TONIGHT AND EARLY TUESDAY MORNING.

CHANCES FOR PRECIP SHOULD DIMINISH AFTER 6Z AS UPPER WAVE PASSES OFF TO THE EAST...BUT SKIES WILL REMAIN CLOUDY PER NAM/GFS FCST SOUNDINGS. BOTH SHOW CLOUD COVER DIMINISHING TUESDAY AS DRIER AIR ADVECTS IN FROM THE W/SW...WHICH IS OBSERVED IN VISIBLE SATELLITE OVER AR/OK ATTM. HOWEVER THAT MAY BE DELAYED DUE TO VERY STRONG INVERSION SEEN AROUND 850MB. OVERALL WILL TREND TOWARD PARTLY CLOUDY WORDING IN THE AFTN TUESDAY.

REGARDING TEMPS...USED A 50/50 BLEND OF NAM/GFS TEMPS WHICH YIELDED MIDDLE 20S MOST LOCATIONS FOR LOWS TONIGHT...AND UPPER 30S/LOWER 40S FOR HIGHS TUESDAY.

CS

.LONG TERM (TUESDAY NIGHT-MONDAY)...

TUES NIGHT-WED NIGHT...

THIS PERIOD BEGINS WITH THE UPPER FLOW PATTERN MAINLY ZONAL/SLIGHTLY NW. AT THE SFC...LOW PRESSURE AND ASSOCIATED FRONT EXTEND FROM HUDSON BAY SW TO SRN GREAT LAKES. A SHORTWAVE EMBEDDED IN WNW FLOW ALOFT IS LOCATED ACROSS THE NRN PLAINS. AT THIS TIME...THINK THE SFC FRONT FROM THE GREAT LAKES MAY STAY TO OUR NE FOR THE MOST PART...AND ONLY BRING A SLIGHT WIND SHIFT TO THE AREA WED MORNING. HOWEVER TIME-HEIGHT CROSS SECTIONS ACROSS OUR NE FROM THE NAM AND GFS INDICATE DEEPER MOISTURE FROM 06-12Z...EXTENDING INTO THE -5 TO -15 DEGREE C RANGE. THINK THAT ONLY TRACE AMOUNTS OF PRECIP WOULD OCCUR (IN THE FORM OF FLURRIES) SO MAY INSERT THIS INTO THE GRIDS. THINK A BETTER CHANCE RESIDES WITH THE UPPER PLAINS` SHORTWAVE DIVING SEWD ACROSS THE CWA WED NIGHT. THIS MAY HELP SPARK A FEW LIGHT SHOWERS ACROSS THE AREA...WITH THE BEST CHANCE ACROSS THE NERN CWA. THINK SLT CHC SNOW SHOWERS SHOULD DO THE TRICK. ANY PRECIP WOULD BE LIGHT IN NATURE.

THU-FRI...

THIS PERIOD WILL BE MAINLY DRY AS UPPER TROUGH MOVES OFF TO THE NE AND SFC HIGH PRESSURE TRIES TO NOSE IN FROM THE WEST. STILL A NW FLOW ALOFT WILL BE PRESENT ACROSS THE REGION...AND MAY HAVE SOME LINGERING FLURRIES ACROSS OUR NE THU MORN. WOULD BE A MINIMAL SHOT SO WILL NOT INSERT INTO GRIDS AT THIS TIME. MODELS HAVE BEEN TRENDING CLOSER TO THE ECMWF...WHICH HAS BEEN THE MOST CONSISTENT MODEL DOWNPLAYING THE SOUTHWARD ADVANCEMENT OF ARCTIC AIR. STILL...THINK TEMPS WILL HAVE A HARD TIME GETTING OUT OF THE 30S FOR THU UNDER THE NW FLOW (ESPECIALLY ACROSS OUR NE). TEMPS SHOULD SLOWLY MODERATE ON FRI...WITH VALUES CLOSER TO NORMAL.

SAT-MON...

THIS PERIOD POSES THE MOST UNCERTAINTY...HOWEVER FORECASTER CONFIDENCE INCREASING DUE TO THE CONSISTENCY WITH THE ECMWF. AT THE BEGINNING OF THIS PERIOD...UPPER FLOW ALOFT IS STILL A WNW FLOW...WITH A CUT-OFF LOW OVER THE SWRN CONUS FINALLY EJECTING INTO THE SRN PLAINS. MODERATING TEMPS CONTINUE WITH SWRLY SFC WINDS AND SLT RIDGING OVERHEAD. A SFC LOW IS LOCATED OVER THE GREAT LAKES REGION SAT MORN...WITH SWWD EXTENDING FRONT. THIS FRONT WILL LIKELY PASS THROUGH THE REGION SATURDAY...WHILE AT THE SAME TIME UPPER LOW EJECTING INTO PLAINS TRAVELS JUST TO OUR SOUTH. A COMBINATION OF THESE POSES A SLT PRECIP THREAT FOR THE AREA...HOWEVER QPF AMOUNTS LOOK VERY LIGHT AT THIS POINT SINCE OUR CWA RESIDES IN THE MIDDLE OF THE TWO NRN AND SRN STREAMS. WILL JUST CARRY SLT CHC POPS...AND WOULD LIKELY START OFF AS LIQUID. SAT NIGHT...PRECIP SHOULD SWITCH TO -SHSN AS TEMPS AT 850MB DROP TO AROUND -12 DEGREES C. UPPER TROUGH BEHIND NRN STREAM FRONT TRIES TO BRING ARCTIC AIR INTO THE REGION...HOWEVER TREND IS TO LIGHTEN THE PUNCH...WITH THE NE CONUS REALLY EXPERIENCING THE WORST OF THE ARCTIC AIR. COULD HAVE A CHC OF FLURRIES WITH THE UPPER TROUGH PASSAGE...BUT GIVEN VERY DRY ATMS WILL NOT INSERT INTO THE GRIDS FOR SUNDAY AT THIS TIME. DESPITE THE MODELS TRENDING TOWARD KEEPING THE COLDEST TEMPS TO OUR NE...ENSEMBLES STILL SHOW TEMPS 1 STD DEV BELOW NORM SUN-MON...SO WILL TREND TOWARD ROUGHLY 3-5 DEGREES BELOW NORMAL FOR THESE DAYS.

AL

&&

.AVIATION (18Z TAFS)...

EXTENSIVE LOW STRATUS WILL BE THE DOMINANT FORECAST PROBLEM FOR AVIATION CONCERNS THE NEXT 24 HRS.

BASED ON OBSERVATIONAL TRENDS AND LATEST RUC/NAM SOUNDINGS... EXPECT SCT AREAS OF DRIZZLE/-SHRA TO CONTINUE THROUGH THE AFTN HOURS. THESE WILL LOCALLY REDUCE CIGS/VSBYS TO AROUND 700FT/1SM RESPECTIVELY. OTHERWISE CIGS WILL REMAIN IN THE MVFR CATEGORY THROUGH 0Z...WITH VSBYS IN THE VFR RANGE. WILL MAINTAIN 6SM -DZ BR AS PREVAILING AT SDF/LEX/BWG.

INTO THIS EVENING LOWER LEVELS COOL SUCH THAT A FEW FLURRIES OR -SHSN MAY BE POSSIBLE HOWEVER COVERAGE IS NOT ENOUGH TO INCLUDE IN THE TAFS AT THIS TIME. LOW LEVEL RH FIELDS SUGGEST THAT CIGS MAY LIFT SLIGHTLY FROM LATE AFTN INTO THE EVENING AS DRIER AIR SLIDES ACROSS THE CWA...BUT ONLY TEMPORARILY. NAM FCST SOUNDINGS THEN INDICATE THAT CIGS MAY BECOME QUITE LOW (LIFR) AFTER 6Z (ESPECIALLY AT LEX) WHILE MOS GUIDANCE IS LESS PESSIMISTIC. WILL GO WITH A BLEND OF SOLUTIONS FOR THE TIME BEING.

WITH HIGH PRES MOVING INTO THE REGION FROM THE PLAINS...WINDS WILL GENERALLY BE WESTERLY AND LIGHT...AOB 10KTS THROUGH THE 18Z TAF PERIOD.

CS

&&

.LMK WATCHES/WARNINGS/ADVISORIES... KY...NONE. IN...NONE.

&&

$$


AREA FORECAST DISCUSSION
NWS ALBUQUERQUE NM
AFDABQ 202 PM MST SUN JAN 21 2007

.DISCUSSION... 20Z SFC ANALYSIS SHOWS LOW PRESSURE CENTERED OVER S CENTRAL CO WITH A COLD FRONT DRAPED SW THROUGH NW NM INTO SOUTHERN AZ. 1022MB HIGH PRES AREA IS NOSING DOWN THE LEE OF THE ROCKIES EAST OF DENVER FORCING A COLD FRONT SOUTH INTO NE NM. WV/IR SAT IMAGERY SHOWS AN UPPER LEVEL LOW MOVING SOUTH THRU AZ WITH A SHEARED UPPER TROUGH OVER CENTRAL CO EXTENDING EAST INTO THE UPPER MIDWEST. THE LATEST 400-200MB AIRCRAFT DATA INDICATES A 110-130 KNOT JET OVER EASTERN NV DIVING SOUTH BEHIND THE UPPER LOW. RADAR TRENDS THIS AFTERNOON SHOW SN BREAKING OUT OVER EASTERN AZ AS WELL AS BEHIND THE FRONT OVER SE CO.

12Z MREF H5 HEIGHT PATTERN IN GOOD AGREEMENT WITH 15Z SREF THAT 3-4 SIGMA UPPER LEVEL LOW WILL CONTINUE TO MOVE SOUTH THRU MON AFT TO A POSITION OVER FAR NE SONORA...WITH LITTLE ENSEMBLE SPREAD. 12Z NAM AND GFS SOLNS IN GOOD AGREEMENT WITH THE DETAILS OF THE DEVELOPING WINTER STORM FOR SOUTHWEST CORNER OF NM. SIDED WITH 12Z GFS ON MODEL DETAILS WITH HPC COLLABORATION AND WWD SNOW AMOUNT GRAPHICS. UPPER DIVERGENCE WILL INCREASE OVERNIGHT ACROSS THE WESTERN HALF OF NM AS THE UPPER LOW DIVES SOUTH. THE COLD FRONT OVER SE CO WILL ALSO ADVANCE SOUTHWEST ACROSS THE NE PLAINS INTO THE CENTRAL VALLEYS AFTER DARK. THIS WILL ALLOW A DECENT CANYON WIND TO AFFECT USUAL LOCATIONS ACROSS ABQ AND SET UP A CONVERGENCE ZONE ALONG THE CONTINENTAL DIVIDE OVERNIGHT. PLENTIFUL LOW LEVEL MOISTURE... UPSLOPE FLOW INTO THE WESTERN MTNS AND GILA REGION...MODERATE UPPER DIVERGENCE...ALONG WITH IDEAL DENDRITIC SNOW GROWTH WILL YIELD AVERAGE OF 5-10 INCHES OF SNOW WITH LOCALLY HIGHER AMOUNTS UP TO 15 INCHES ALONG THE CONTINENTAL DIVIDE. HENCE WILL UPGRADE ZONE 8 AND 14 TO WARNING AND BUFFER WITH A SNOW ADV FOR ZONES 15-16-17-26. ABQ SITS IN A UNIQUE LOCATION AS EAST WINDS WILL LIKELY BLOW SNOW BEYOND WEST MESA HOWEVER WEAK OVERTOPPING MAY DEPOSIT SOME SNOW IN THE FOOTHILLS. LEFT SANDIA...MANZANOS...AND ABQ OUT OF THE ADVISORY ATTM. WILL LIKELY SEE A LARGE SNOWFALL GRADIENT OVER EASTERN CIBOLA AND WESTERN SOCORRO COUNTIES.

MODEL SOLNS DIVERGE CONSIDERABLY BEYOND TUESDAY WITH POSITION OF UPPER LOW. GFS TAKES STORM SYSTEM WELL SOUTH INTO CHIHUAHUA WHILE NAM SPINS UPPER LOW ALONG NM/MEXICO BORDER. BOTH MODELS LIFT SYSTEM NORTHWARD THRU NM LATE IN THE WEEK WITH ANOTHER POSSIBLE WINTER STORM. TIMING AND INTENSITY WITH THIS IS SIGNIFICANTLY DIFFERENT FROM MODEL TO MODEL AND RUN TO RUN. LEFT SLIGHT CHANCE POPS IN THE EXTENDED AND KEPT PARTLY-MOSTLY CLOUDY SKIES ACROSS THE SOUTH.

&&

.PRELIMINARY POINT TEMPS/POPS... FARMINGTON...................... 17 36 10 39 / 20 0 0 0 GALLUP.......................... 15 30 -2 35 / 60 10 0 0 GRANTS.......................... 17 31 2 37 / 70 30 5 0 GLENWOOD........................ 28 36 17 43 / 90 60 20 5 CHAMA........................... -1 26 -9 32 / 20 0 0 0 LOS ALAMOS...................... 10 32 6 35 / 50 10 0 0 RED RIVER....................... -3 22 -12 31 / 30 0 0 0 TAOS............................ 6 31 2 38 / 30 0 0 0 SANTA FE........................ 14 31 9 35 / 40 10 0 0 SANTA FE AIRPORT................ 15 33 11 37 / 40 10 0 0 ESPANOLA........................ 15 36 12 41 / 30 5 0 0 ALBUQUERQUE HEIGHTS............. 25 36 19 39 / 50 20 5 0 ALBUQUERQUE VALLEY.............. 24 37 13 41 / 50 20 5 0 ALBUQUERQUE FOOTHILLS........... 23 35 16 37 / 50 20 5 0 ALBUQUERQUE WEST MESA........... 24 36 18 39 / 50 20 5 0 SOCORRO......................... 24 36 16 41 / 60 40 10 5 SANDIA PARK/CEDAR CREST......... 18 32 14 34 / 60 20 5 0 MORIARTY/ESTANCIA............... 17 32 8 36 / 50 20 5 0 CARRIZOZO....................... 22 32 18 37 / 50 50 20 5 RUIDOSO......................... 18 27 15 33 / 60 60 30 10 RATON........................... 8 32 3 40 / 30 0 0 0 LAS VEGAS....................... 10 31 8 40 / 50 10 0 0 ROY............................. 12 31 17 41 / 10 0 0 0 CLAYTON......................... 13 32 13 39 / 10 5 0 0 SANTA ROSA...................... 21 33 16 44 / 20 10 5 5 TUCUMCARI....................... 18 33 15 41 / 10 10 0 0 FORT SUMNER..................... 21 35 13 43 / 20 10 5 5 CLOVIS.......................... 21 34 16 42 / 10 10 5 5 PORTALES........................ 21 35 14 43 / 10 10 5 5 ROSWELL......................... 24 34 22 39 / 30 40 10 10

&&

.ABQ WATCHES/WARNINGS/ADVISORIES... WINTER STORM WARNING FROM 5 PM THIS AFTERNOON TO 5 PM MST MONDAY FOR THE FOLLOWING ZONES...NMZ008-014.

SNOW ADVISORY FROM 5 PM THIS AFTERNOON TO 5 PM MST MONDAY FOR THE FOLLOWING ZONES...NMZ015>017-026.

&&

$$

GUYER


AREA FORECAST DISCUSSION
NWS LOUISVILLE KY
AFDLMK 300 AM EST JAN 22 2007

.AVIATION (06Z TAFS)... BOTH THE GFS AND NAM LOW LEVEL RH FIELDS POINT TO CLEARING SKIES OVER THE WESTERN FA 10-12Z AND IN THE EAST BY AFTN...THIS LOOKS TO BE A BIT TOO FAST CONSIDERING THE LATEST SAT TRENDS. CIGS 2000 TO 2500 FT UNTIL CLEARING...SOME LOWER CIGS 1200-15000 ERN SECS FOR THE FIRST TWO OR THREE HOURS. WILL INTROD MID CLDS IN ASSOCIATED WITH SHORT WAVE DROPPING SOUTHEAST INTO THE REGION DURING THE EARLY NIGHT HOURS THIS TUE EVE. --21

.EVENING UPDATE...

UPDATED ZONES TO TAKE OUT EVENING WORDING. LOWERED DEWPOINTS AND TEMPERATURES ACROSS THE NORTH HALF OF CWA TO REFLECT LATEST OBS. EARLIER...SOME LIGHT SLEET WAS REPORTED ACROSS CENTRAL KENTUCKY. RADAR RETURNS HAVE DIMINISHED CONSIDERABLY AND ASIDE FROM A FEW STRAY FLURRIES OR AN ICE PELLET...HAVE REMOVED POPS FROM THE FORECAST. EXTENSIVE LOW CLOUDS CONTINUE WEST ALL THE WAY THROUGH ILLINOIS. ANY CLEARING WILL HAVE TO WAIT UNTIL TOMORROW AFTERNOON AT THE EARLIEST.

.AVIATION (00Z TAFS)...

EXTENSIVE LOW STRATUS WILL CONTINUE OVERNIGHT THROUGH THE MORNING HOURS TUESDAY. PATCHY DRIZZLE OR FLURRIES MAY BRIEFLY REDUCE VISIBILITIES TO BELOW 5SM THIS EVENING. CEILINGS WILL REMAIN MVFR AND VARY BETWEEN 1 AND 1.5 THOUSAND FEET OVERNIGHT...BUT PERHAPS LOWER CLOSER TO ONE THOUSAND FEET AT LEX...DUE TO NORTHWEST FLOW AND HIGHER ELEVATION. SURFACE WINDS WILL REMAIN WEST NORTHWEST AT 5 TO 10 MPH OVERNIGHT..WITH 15-20 MPH WEST NORTHWEST WINDS AT 2000 FEET. DUE TO STRONG INVERSION AT 5000 FEET...LOW CLOUDS WILL BE SLOW TO ERODE...BUT MAY BECOME SCATTERED TUESDAY AFTERNOON. JSD

.SHORT TERM (TONIGHT-TUESDAY)...

EXTENSIVE LOW CLOUDS OVER THE ENTIRE OHIO VALLEY REGION TODAY. THIS COUPLED WITH WEAK COLD ADVECTION HAS LED TO STEADY OR SLOWLY FALLING TEMPS TODAY...IN THE MID-UPPER 30S MOST PLACES AS OF 19Z. SCT PRECIP ON RADAR...AND BASED ON SPOTTER REPORTS COUPLED WITH ACARS DATA... PTYPE IS A MIX OF -RA/-SN/-PL...BUT INTENSITIES ARE VERY LIGHT. EXPECT THIS TO CONTINUE FOR THE REMAINDER OF THE AFTN HOURS.

FCST SOUNDINGS SHOW LOW LEVEL LAPSE RATES STEEPENING INTO THE EVENING HOURS. THIS ALONG WITH LIFT FROM PASSING UPPER TROF WILL HELP CONTINUE POTENTIAL FOR PRECIP THIS EVENING...WILL WORD AS SLIGHT CHANCE OF -SHRA/-SHSN...HOWEVER AIRMASS ABOVE 800MB (ICE CRYSTAL LEVELS) IS FCST TO REMAIN ON THE DRY SIDE...SO PRECIP AMTS SHOULD BE LIGHT AND WE MAY END UP SEEING MORE OF A PATCHY LIGHT DRIZZLE/FLURRY TYPE DEAL. WILL MENTION ISLTD SLICK SPOTS POSSIBLE IN THE HWO FOR TONIGHT AND EARLY TUESDAY MORNING.

CHANCES FOR PRECIP SHOULD DIMINISH AFTER 6Z AS UPPER WAVE PASSES OFF TO THE EAST...BUT SKIES WILL REMAIN CLOUDY PER NAM/GFS FCST SOUNDINGS. BOTH SHOW CLOUD COVER DIMINISHING TUESDAY AS DRIER AIR ADVECTS IN FROM THE W/SW...WHICH IS OBSERVED IN VISIBLE SATELLITE OVER AR/OK ATTM. HOWEVER THAT MAY BE DELAYED DUE TO VERY STRONG INVERSION SEEN AROUND 850MB. OVERALL WILL TREND TOWARD PARTLY CLOUDY WORDING IN THE AFTN TUESDAY.

REGARDING TEMPS...USED A 50/50 BLEND OF NAM/GFS TEMPS WHICH YIELDED MIDDLE 20S MOST LOCATIONS FOR LOWS TONIGHT...AND UPPER 30S/LOWER 40S FOR HIGHS TUESDAY.

CS

.LONG TERM (TUESDAY NIGHT-MONDAY)...

TUES NIGHT-WED NIGHT...

THIS PERIOD BEGINS WITH THE UPPER FLOW PATTERN MAINLY ZONAL/SLIGHTLY NW. AT THE SFC...LOW PRESSURE AND ASSOCIATED FRONT EXTEND FROM HUDSON BAY SW TO SRN GREAT LAKES. A SHORTWAVE EMBEDDED IN WNW FLOW ALOFT IS LOCATED ACROSS THE NRN PLAINS. AT THIS TIME...THINK THE SFC FRONT FROM THE GREAT LAKES MAY STAY TO OUR NE FOR THE MOST PART...AND ONLY BRING A SLIGHT WIND SHIFT TO THE AREA WED MORNING. HOWEVER TIME-HEIGHT CROSS SECTIONS ACROSS OUR NE FROM THE NAM AND GFS INDICATE DEEPER MOISTURE FROM 06-12Z...EXTENDING INTO THE -5 TO -15 DEGREE C RANGE. THINK THAT ONLY TRACE AMOUNTS OF PRECIP WOULD OCCUR (IN THE FORM OF FLURRIES) SO MAY INSERT THIS INTO THE GRIDS. THINK A BETTER CHANCE RESIDES WITH THE UPPER PLAINS` SHORTWAVE DIVING SEWD ACROSS THE CWA WED NIGHT. THIS MAY HELP SPARK A FEW LIGHT SHOWERS ACROSS THE AREA...WITH THE BEST CHANCE ACROSS THE NERN CWA. THINK SLT CHC SNOW SHOWERS SHOULD DO THE TRICK. ANY PRECIP WOULD BE LIGHT IN NATURE.

THU-FRI...

THIS PERIOD WILL BE MAINLY DRY AS UPPER TROUGH MOVES OFF TO THE NE AND SFC HIGH PRESSURE TRIES TO NOSE IN FROM THE WEST. STILL A NW FLOW ALOFT WILL BE PRESENT ACROSS THE REGION...AND MAY HAVE SOME LINGERING FLURRIES ACROSS OUR NE THU MORN. WOULD BE A MINIMAL SHOT SO WILL NOT INSERT INTO GRIDS AT THIS TIME. MODELS HAVE BEEN TRENDING CLOSER TO THE ECMWF...WHICH HAS BEEN THE MOST CONSISTENT MODEL DOWNPLAYING THE SOUTHWARD ADVANCEMENT OF ARCTIC AIR. STILL...THINK TEMPS WILL HAVE A HARD TIME GETTING OUT OF THE 30S FOR THU UNDER THE NW FLOW (ESPECIALLY ACROSS OUR NE). TEMPS SHOULD SLOWLY MODERATE ON FRI...WITH VALUES CLOSER TO NORMAL.

SAT-MON...

THIS PERIOD POSES THE MOST UNCERTAINTY...HOWEVER FORECASTER CONFIDENCE INCREASING DUE TO THE CONSISTENCY WITH THE ECMWF. AT THE BEGINNING OF THIS PERIOD...UPPER FLOW ALOFT IS STILL A WNW FLOW...WITH A CUT-OFF LOW OVER THE SWRN CONUS FINALLY EJECTING INTO THE SRN PLAINS. MODERATING TEMPS CONTINUE WITH SWRLY SFC WINDS AND SLT RIDGING OVERHEAD. A SFC LOW IS LOCATED OVER THE GREAT LAKES REGION SAT MORN...WITH SWWD EXTENDING FRONT. THIS FRONT WILL LIKELY PASS THROUGH THE REGION SATURDAY...WHILE AT THE SAME TIME UPPER LOW EJECTING INTO PLAINS TRAVELS JUST TO OUR SOUTH. A COMBINATION OF THESE POSES A SLT PRECIP THREAT FOR THE AREA...HOWEVER QPF AMOUNTS LOOK VERY LIGHT AT THIS POINT SINCE OUR CWA RESIDES IN THE MIDDLE OF THE TWO NRN AND SRN STREAMS. WILL JUST CARRY SLT CHC POPS...AND WOULD LIKELY START OFF AS LIQUID. SAT NIGHT...PRECIP SHOULD SWITCH TO -SHSN AS TEMPS AT 850MB DROP TO AROUND -12 DEGREES C. UPPER TROUGH BEHIND NRN STREAM FRONT TRIES TO BRING ARCTIC AIR INTO THE REGION...HOWEVER TREND IS TO LIGHTEN THE PUNCH...WITH THE NE CONUS REALLY EXPERIENCING THE WORST OF THE ARCTIC AIR. COULD HAVE A CHC OF FLURRIES WITH THE UPPER TROUGH PASSAGE...BUT GIVEN VERY DRY ATMS WILL NOT INSERT INTO THE GRIDS FOR SUNDAY AT THIS TIME. DESPITE THE MODELS TRENDING TOWARD KEEPING THE COLDEST TEMPS TO OUR NE...ENSEMBLES STILL SHOW TEMPS 1 STD DEV BELOW NORM SUN-MON...SO WILL TREND TOWARD ROUGHLY 3-5 DEGREES BELOW NORMAL FOR THESE DAYS.

AL

&&

.AVIATION (00Z TAFS)...

EXTENSIVE LOW STRATUS WILL CONTINUE OVERNIGHT THROUGH THE MORNING HOURS TUESDAY. PATCHY DRIZZLE OR FLURRIES MAY BRIEFLY REDUCE VISIBILITIES TO BELOW 5SM THIS EVENING. CEILINGS WILL REMAIN MVFR AND VARY BETWEEN 1 AND 1.5 THOUSAND FEET OVERNIGHT...BUT PERHAPS LOWER CLOSER TO ONE THOUSAND FEET AT LEX...DUE TO NORTHWEST FLOW AND HIGHER ELEVATION. SURFACE WINDS WILL REMAIN WEST NORTHWEST AT 5 TO 10 MPH OVERNIGHT..WITH 15-20 MPH WEST NORTHWEST WINDS AT 2000 FEET. DUE TO STRONG INVERSION AT 5000 FEET...LOW CLOUDS WILL BE SLOW TO ERODE...BUT MAY BECOME SCATTERED TUESDAY AFTERNOON. JSD

&&

.LMK WATCHES/WARNINGS/ADVISORIES... KY...NONE. IN...NONE.

&&

$$


=AREA FORECAST DISCUSSION
NWS CHICAGO/ROMEOVILLE IL
AFDLOT 530 AM CST MON JAN 22 2007

DISCUSSION FOR MORNING ZONES/GRIDS... 430 AM CST

DISTURBANCES TO PERIODICALLY DROP SOUTHEAST ACROSS CENTRAL CANADA AS THE UPPER RIDGE CONTINUES TO BUILD ACROSS WESTERN CANADA THROUGH THE WEEKEND. THIS KEEPS REGION SEASONALLY COLD AS CORE OF COLD AIR DROPS ACROSS ONTARIO TO THE LOWER LAKES...ST. LAWRENCE VALLEY AND NEW ENGLAND MID AND LATE WEEK. COLD AIR CURRENTLY OVER THE YKON AND ALASKA ARRIVES SAT AND SAT NIGHT FOLLOWING SHORT WAVE TROF PASSAGE AND CFP.

LATEST IMPULSE IS MOVING ACROSS LAKE MI EARLY THIS MORNING WHILE NEXT IN SERIES IS QUICKLY DROPPING ACROSS MT WITH WAA MID CLOUDS ALREADY SPREADING INTO SW MN AND NW IA. STRATUS/STRATOCU CEILINGS CONTINUE TO CLEAR W TO E ACROSS NW AND W CENTRAL IL AT AROUND 30 KTS AND SHOULD CLEAR THE IN STATE LINE BY AROUND 14Z BUT THE MID CLOUDS WILL BE NOT FAR BEHIND AND WILL BE SPREADING ACROSS THE AREA LATER THIS MORNING AND THROUGH THE AFTERNOON. MODELS INDICATE THAT THE ISENTROPIC LIFT AHEAD OF THE SHORT WAVE WILL SLICE ESE ACROSS NW IL INTO CENTRAL IND DURING THE AFTERNOON...AND THAT ONLY THE FAR SW AND SOITHERN PORTIONS OF THE FA ARE AT RISK OF SEEING MEASURABLE SN FROM LATE AFTERNOON THRU THIS EVE.

ANOTHER SHORT WAVE IS TO DROP SE ON WED BUT FURTHER TO THE E ACROSS WESTERN ONTARIO INTO UPPER GREAT LAKES WITH PRECIP THREAT REMAINING IN WI AND LOWER MI. AS THIS WAVE PASSES BY WED NIGHT THE EDGE OF ANOTHER SHOT OF COLD AIR BRUSHES BY INTO THE CENTRAL LAKES. THIS WITH VEERING SURFACE WINDS MAY BRING LAKE EFFECT SHSN AS FAR WEST AS THE NE CORNER OF PORTER CO. THE LAKE EFFECT MAY PERSIST INTO THU AS THE SURFACE RIDGE BUILDS ACROSS THE UPPER MIDWEST AND UPPER GREAT LAKES KEEPING NNW-NW LOW LEVEL FLOW GOING.

UPPER LOW THAT BREACHES THE TOP OF THE WESTERN UPPER RIDGE IS FORECAST TO MOVE FROM NORTHERN SASK AND ACROSS NORTHERN ONTARIO FRI AND SAT. FLOW BACKS AHEAD OF THE SYSTEM AND BRINGS SOME MODERATION FRI AND FRI NIGHT BEFORE COLD FRONT TRAILING FROM THE ASSOCIATED SURFACE LOW DROPS SE OUT OF THE UPPER MIDWEST AND THRU THE FA DURING THE DAY SAT AND SAT NIGHT DELIVERING VERY COLD AIR. ANY SIGNIFICANT PRECIP WITH THIS SYSTEM WILL BE OFF TO THE N AND NE INTO THE GREAT LAKES AND CANADA. LIKELY TO BE SOME FLURRIES OR LIGHT SNOW SHOWERS PRE AND ESPECIALLY POST CFP BUT OF NO CONSEQUENCE. TRS

&&

.AVIATION DISCUSSION... 538 AM CST

THE SNOW COVER WILL KEEP THE ATMOSPHERE COLDER THAN WITHOUT SNOW BELOW 930 MB TODAY AND TONIGHT. THIS IS SEEN ON THE 1205 UTC ACARS SOUNDING FROM ROCKFORD AND THE 1148 UTC SOUNDING AT ORD AS AN INVERSION AROUND 900 MB. SOUTHWEST WIND IS BRINGING WARM AIR INTO THE REGION AND MIX OF THE WARM AIR AND COLD AIR IS FORMING STRATUS CLOUDS. A WEAK SURFACE TROUGH OVER SOUTHERN WISCONSIN WILL PASS THROUGH THIS AFTERNOON AND THE WIND WILL SHIFT TO THE WEST. THERE WILL BE SOME DRIER AND COLDER AIR ABOVE THE BOUNDARY LAYER. SO THE STRATUS CLOUDS MAY BECOME SCATTERED THIS AFTERNOON. BUT THE STRATUS MAY COME BACK WITH SOME FOG TONIGHT AS THE WIND BECOMES LIGHT AND THE INVERSION SETS UP. WILL ADD MVFR CEILINGS TONIGHT. &&

.LOT WATCHES/WARNINGS/ADVISORIES... .IL...NONE. .IN...NONE. .LM...SMALL CRAFT ADVY FOR ILLINOIS AND INDIANA NEARSHORE UNTIL 1 PM CST.

&&

$$


AREA FORECAST DISCUSSION
NWS SAN DIEGO CA
AFDSGX 230 PM PST TUE JAN 23 2007

.SYNOPSIS...WEAK OFFSHORE FLOW AND HIGH PRESSURE ALOFT WILL CONTINUE MOSTLY CLEAR SKIES WITH WARMER DAYS THROUGH THURSDAY. LOCALLY BREEZY THROUGH AND BELOW MOUNTAIN CANYONS AND PASSES AT TIMES THROUGH THURSDAY. UPPER LEVEL LOW PRESSURE AND ONSHORE FLOW WILL BRING MORE CLOUDS AND COOLER DAYS THIS WEEKEND AND EARLY NEXT WEEK.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...

.SHORT TERM (TODAY-FRI)...CLEAR SKIES TODAY EXCEPT FOR A FEW HIGH CLOUDS. ACARS SOUNDINGS SHOWED WEAK NE WINDS AT OR BELOW 10 KTS IN THE LOW LEVELS AND ONLY 25-30 KT ABOVE 10 KFT. WEAKENING OFFSHORE GRADIENTS WITH ABOUT -4 MB SAN-TPH.

A RIDGE OF HIGH PRESSURE WILL MOVE ACROSS THE W COAST WHILE A LOW UNDERCUTS IT AND MEANDERS AROUND OVER NW MEX THROUGH WED. AN UPPER TROUGH MOVES INTO NRN CA AND THE CLOSED LOW OVER MEX BEGINS TO MOVE OFF THE TO E ON THU. THE TROUGH CONTINUES TO SLOWLY MOVE E WITH GRADUALLY LOWERING HEIGHTS LATE THU AND FRI. WEAK OFFSHORE FLOW MAY BRIEFLY REINTENSIFY WED BUT WINDS WILL REMAIN BELOW ADVISORY STRENGTH. TEMPS AT 850 MB INCREASE THROUGH WED...LEVEL OFF THU AND DECREASE A LITTLE FRI. SKIES WILL REMAIN MOSTLY CLEAR THROUGH THU THEN THERE WILL BE INCREASING HIGH CLOUDINESS FRI. MILD DAYS IN MOST AREAS WED...ESPECIALLY W OF THE MOUNTAINS. SLIGHTLY COOLER THU IN THE COASTAL AND VALLEY AREAS AS A STRONGER AFTERNOON SEA BREEZE DEVELOPS. COOLER IN MOST AREAS FRI WITH DECREASING HEIGHTS AND STRONGER ONSHORE FLOW.

THE DRY OFFSHORE FLOW WILL CONTINUE AREAS OF VERY LOW HUMIDITIES THE REMAINDER OF THIS AFTERNOON. IT WILL STILL BE QUITE DRY WED BUT HUMIDITIES SHOULD NOT BE LOW ENOUGH FOR A LONG ENOUGH PERIOD OF TIME FOR RED FLAG CONDITIONS.

.LONG TERM (SAT-TUE)...PROGS CONTINUE IN POOR AGREEMENT ON THE DETAILS BUT GENERALLY INDICATE TROUGHING ALOFT AND ONSHORE FLOW THROUGH THE EXTENDED PERIOD. THIS WILL BRING A RETURN OF MARINE LAYER CLOUDS AND ALSO MORE MID TO HIGH CLOUDINESS. THE COOL UPPER TROUGH AND LIMITED MOISTURE WILL RESULT IN A SLIGHT CHANCE OF PRECIP EARLY NEXT WEEK OVER AND W OF THE MOUNTAINS. COOLER DAYS. RELATIVELY MILD NIGHTS W OF THE MOUNTAINS DUE TO INCREASED CLOUD COVER.

&&

.AVIATION... CLEAR SKIES TONIGHT THROUGH WEDNESDAY. ONLY AVIATION CONCERN IS OCCASIONAL MODERATE TURBULENCE OVER AND TO THE SOUTHWEST OF MOUNTAINS. WINDS BELOW FL035 UNTIL 2000 PST/0400 UTC...WEST TO NORTHWEST 5-10 KNOTS...OTHERWISE WINDS FL0100-FL100 NORTHEAST 10-20 KNOTS TONIGHT BECOMING EAST 10-15 KNOTS AFTER 0700 PST/1500 UTC.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...

RED FLAG WARNING UNTIL 6 PM PST THIS AFTERNOON FOR THE MOUNTAINS...INLAND VALLEYS AND ORANGE COUNTY. SEE LAXRFWSGX.

&&

$$

PUBLIC...DVA AVIATION...BALFOUR