AVIATION FORECAST DISCUSSION FOR 00Z TAF CYCLE
AFDCHI LOW CLOUDS CONTINUE TO VERY SLOWLY PULL OFF TO THE EAST. UPPER LOW
WOBBLING A BIT.. BUT SHOULD GET FAR ENOUGH EAST TO GET US INTO
PARTIAL CLEARING LATE THIS EVENING...AND LOSE OUR CIGS SOMETIME
AROUND 08Z. SOME CHANCE OF FILLING BEFORE DAYBREAK IN AREAS THAT
CLEAR OUT...BUT EVERYTHING SHOULD BE OUT OF THE AREA BY SUNRISE.
LIGHT WEST WINDS TO BECOME LIGHT SOUTHWEST AND CONTINUE THROUGH THE
END OF THE PERIOD.
JHV
AREA FORECAST DISCUSSION
NWS SEATTLE WA
AFDSEW 930 AM PST SAT MAR 22 2003
.SYNOPSIS...SHOWERY AND BLUSTERY WEATHER IN THE WAKE OF A STRONG COLD
FRONT WILL CONTINUE THROUGH THE DAY AND DIMINISH BY SUNDAY. TEMPORARY
HIGH PRESSURE WILL BE OVER THE REGION MONDAY. ANOTHER COLD FRONT WILL
BRING MORE RAIN LATE MONDAY NIGHT INTO TUESDAY.
.DISCUSSION...SATELLITE IMAGERY SHOWS COLD FRONT INTO CASCADES AT
16Z. WESTERLIES ALREADY FLOWING THROUGH THE STRAIT AND CONVERGENCE
ZONE ALREADY FORMING NEAR EAST ENTRANCE TO THE STRAIT. THIS COMBINED
WITH STRONG WSWLY FLOW ALOFT HAS LEFT A BIG BREAK IN THE CLOUD COVER
OVER PUGET SOUND. AIR MASS QUITE UNSTABLE BEHIND THE FRONT WITH
LIFTED INDEXES STILL BELOW 0 THIS AFTERNOON AND CONVECTIVE
TEMPERATURES NEAR 50. THIS SHOULD HELP CLOSE UP THE HUGE BREAKS IN
THE CLOUD COVER BUT STILL EXPECT SOME SUNSHINE ESPECIALLY FROM NORTH
SEATTLE TO EDMONDS. NO ACARS DATA POST FRONTAL BUT PASS TEMPERATURES
ARE FALLING QUICKLY AT 16Z AND FORECAST OF SNOW LEVEL BELOW ALL THE
PASSES THIS AFTERNOON LOOKS GOOD. SURFACE AND UPPER LEVEL TROUGH
MOVING THROUGH THE AREA SUNDAY MORNING. FLOW ALOFT BECOMING NWLY
BEHIND THE TROUGH. THIS WILL PUSH THE CONVERGENCE ZONE DOWN INTO THE
METRO AREA. DRYING TREND STILL INTACT FOR LATER SUNDAY INTO MONDAY AS
SURFACE HIGH BUILDS INLAND AND WEAK UPPER LEVEL RIDGE MOVES ACROSS
THE AREA. WILL ADD SOME SUNSHINE TO THE FORECAST FOR TODAY OTHERWISE
LITTLE CHANGE. felton
UIL 886 SEA 666 OLM 886
.KSEW...GALE WARNING CENTRAL AND EASTERN STRAIT.
.SMALL CRAFT ADVISORY REMAINDER OF THE WATERS.
.WINTER STORM WARNING NORTH CASCADES.
.SNOW ADVISORY CENTRAL CASCADES.
.FLOOD WARNING SKOKOMISH RIVER.
.KATX...VCP21/CSR21...OPERATIONAL.