Forecast Discussions mentioning "ACARS", "MDCRS", or "AIRCRAFT" received at FSL on 04/02/02

.SYNOPSIS...AN UPPER LEVEL RIDGE OFFSHORE WILL MAINTAIN DRY WEATHER OVER WESTERN WASHINGTON THROUGH MIDWEEK. A SURFACE HIGH OVER BRITISH COLUMBIA WILL SUPPLY COOL NORTH WINDS ACROSS THE AREA THROUGH MIDWEEK. THE OFFSHORE RIDGE WILL WEAKEN BY THURSDAY...WITH THE NEXT FRONTAL SYSTEM ARRIVING ON FRIDAY.

.DISCUSSION...RADAR AND OBS SHOWING ONLY ISOLATED SHOWERS UP NEAR WHIDBEY ISL AND DOWN NEAR TACOMA TO ABT SHELTON...REMNANTS OF OLD CONVERGENCE ZONES. NLY LOW LEVEL FLOW COVERS MOST OF PGTSND ALREADY AND PER ACARS SOUNDINGS IS ABOUT 4000 FT DEEP. FLOW THRU E ENTRANCE STRAIT IS ALSO BECOMING MORE NELY...THUS CONVERGENCE ZONE PCPN WILL BE DYING OUT VERY SOON. WL GO WITH DRY FCST FOR MID MORNING UPDATE. VSBL SATELLITE IMAGERY SHOWS MOST AREAS ALREADY PARTLY SUNNY...BUT BIG CLOUD DECK IS STILL STUCK OVR PGTSND EXTENDING FM EVERETT DOWN TO OLYMPIA...AND FM OLYMPICS TO CASCDS. BIG QUESTION IS JUST HOW MUCH IT WILL BREAK UP THIS AFTN. CURRENT FCST LOOKS OK WITH PARTLY SUNNY THIS AFTN...BUT MIGHT STILL BE MSTLY CLDY S PART PGTSND THRU MID AFTN.

OFSHR UPR RIDGE MAINTAINS STRENGTH THRU MIDWEEK. A LITTLE MSTR FROM UPSTREAM TROUGH SLIDES THRU THE RDG WED...BUT NEW AVN TAKES IT UP INTO B.C. UPR RDG BREAKS DOWN BY THU WITH MDLS STILL INSISTING ON BRINGING THE OFSHR TROF ACRS THE AREA FRI. SUSPECT IT MAY BE LATER THAN THIS. WITH WESTERLIES ALF OVER THE AREA THIS WEEKEND...WETTER FCST LOOKS GOOD. KAM UIL 100 SEA 100 OLM 100

.SEW...SNOW ADVISORY THIS MORNING CENTRAL CASCDS... .SMALL CRAFT ADVISORY COAST...STRAIT...

.KATX...VCP31/CSR31...OPERATIONAL.



.SYNOPSIS...A PERSISTENT MARINE LAYER WILL BRING NIGHT AND MORNING LOW CLOUDS TO AREAS WEST OF THE MOUNTAINS THROUGH THURSDAY... CLEARING TO NEAR THE COAST EACH AFTERNOON...WITH A SLOW COOLING TREND FOR THE MOUNTAINS AND DESERTS. A PACIFIC TROUGH OF LOW PRESSURE WILL BRING A DEEPER MARINE LAYER FOR FRIDAY AND SATURDAY WILL ONLY PARTIAL AFTERNOON CLEARING WEST OF THE MOUNTAINS...AND WITH GUSTY WINDS AND A LITTLE COOLER TEMPERATURES FOR THE MOUNTAINS AND DESERTS.

.DISCUSSION...MON EVENING ACARS SOUNDINGS SHOWED THE BASE OF A STRONG MARINE INVERSION AT 2000 FT WITH A TOP OF 2500 FT. THE MARINE LYR IS EXPECTED TO DEEPEN TO AROUND 3000 FT THIS MORNING WITH MINOR DAY TO DAY FLUCTIONS THRU THU. INCRG MARINE LYR DEPTH SHOULD REDUCE DENSE FOG COVERAGE IN THE VLYS THIS MORNING WITH ONLY LCL DENSE FOG NR THE FOOTHILLS. LOW CLOUDS ARE EXPECTED TO REMAIN NR THE CST THIS AFTERNOON WITH INLAND CLRG A LTL SLOWER TODAY. TEMPERATURES IN THE MTNS AND DESERTS WL GRADUALLY COOL TODAY THRU THU WITH A FEW HIGH CLOUDS AT TIMES.

THE WK UPR LOW OVR SRN CA WL DRIFT SLOWLY WWD OFF THE CST THRU WED...THEN BE NUDGED INLAND THU AHEAD OF TROUGH OF LOW PRESSURE OVR THE ERN PAC. THIS TROUGH MOVES INLAND ACROSS SRN CA FRI WITH THE AVN THE MOST AMPLIFIED OF ALL THE MDLS WITH THIS TROUGH. IF THE MORE AMPLIFIED AVN WERE TO VERIFY FOR FRI/SAT...THERE COULD BE SOME LIGHT RAIN ALG AND W OF THE MTNS LATE FRI NIGHT AND EARLY SAT. FOR NOW...HAVE GONE WITH A LESS AMPLIFIED AVN SOLUTION FOR FRI/SAT SHOWING DEEPENING OF THE MARINE LYR WITH GUSTY WINDS AND SOME ADDITIONAL COOLING IN THE MTNS AND DESERTS. WK RDGG DEVELOPS FOR SUN/MON WITH INLAND WARMING AND A DECRG MARINE LYR DEPTH W OF THE MTNS.

.SAN...NONE.

MARTIN