Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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000
FXUS66 KSEW 242150
AFDSEW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
300 PM PDT TUE MAR 24 2015

.SYNOPSIS...THERE WILL BE A BREAK BETWEEN WEATHER SYSTEMS THIS
EVENING. A WARM FRONT WILL SPREAD RAIN INTO THE AREA LATER TONIGHT
AND WEDNESDAY. AN UPPER LEVEL RIDGE WILL BRING WARM DRY WEATHER
THURSDAY. THE RIDGE WILL SHIFT EAST ON FRIDAY AND A WEAK FRONT WILL
REACH THE AREA FRIDAY NIGHT. HIGH PRESSURE WILL LIKELY REBUILD FOR
THE WEEKEND. A FRONT MAY REACH THE AREA AROUND MONDAY NIGHT.

&&

.SHORT TERM...A WARM FRONT WILL MOVE THROUGH WESTERN WA ON WEDNESDAY
AS AN UPPER RIDGE BUILDS TOWARD THE AREA. THE SNOW LEVEL WILL RISE
ABOVE THE PASSES ON WED. THE RAIN WILL SHIFT NORTH INTO B.C. WED
EVENING AND SHOULD DRY UP ENTIRELY BY DAYBREAK THURSDAY. SKIES WILL
CLEAR BY THURSDAY AFTERNOON...AND HIGH TEMPS SHOULD WARM WELL INTO
THE 60S UNDER A STRONG UPPER RIDGE. THE RIDGE WILL SHIFT EAST ON
FRIDAY AS A WEAK SPLITTING FRONT NEARS THE COAST.

.LONG TERM...THE WEAK FRONT WILL BRING SOME RAIN TO PARTS OF WRN WA
FRIDAY NIGHT...MAINLY COAST AND MOUNTAINS. SATURDAY MAY START OUT
DAMP AND DRIPPY BUT OVERALL THE WEEKEND SHOULD TURN OUT DRY. THE
UPPER LEVEL RIDGE THAT BUILDS OVER THE AREA FOR THE WEEKEND IS NOT
NEARLY AS STRONG AS THE RIDGE ON THURSDAY. ANOTHER FRONT SHOULD
APPROACH THE AREA MONDAY OR MONDAY NIGHT.

&&

.HYDROLOGY...FLOODING IS UNLIKELY THE NEXT 7 DAYS.

&&

.AVIATION...WEAK ISOLATED SHOWERS WILL REMAIN OVER THE AREA THIS
AFTERNOON. THE FLOW ALOFT IS WESTERLY. CLOUDS WILL INCREASE
OVERNIGHT AS A WARM FRONT MOVES INLAND. EXPECT RAIN ALONG THE COAST
BY 04-06Z TONIGHT...THEN SPREADING INTO THE INTERIOR 06-09Z. RAIN
WILL CONTINUE THROUGH WEDNESDAY AS THE FRONT LIFTS NORTH THROUGH
WESTERN WA. EXPECT A MOIST AND STABLE AIR MASS WITH MVFR CIGS
POSSIBLE. 33

KSEA...CIGS 035-050 THIS EVENING. SURFACE WINDS WILL REMAIN
SOUTHERLY TO 10 KT. A WARM FRONT WILL BRING MORE RAIN TO THE AREA BY
06-09Z TONIGHT. 33

&&

.MARINE...SOUTH TO SOUTHEAST WINDS WILL RISE TONIGHT AS A WARM FRONT
MOVES INLAND. SMALL CRAFT ADVISORIES ARE IN EFFECT FOR THE COASTAL
WATERS...ENTRANCES TO THE STRAIT...NORTHERN INLAND WATERS AND
ADMIRALTY INLET. WINDS WILL EASE WED NIGHT AND THU AS HIGH PRES
BUILDS OVER WESTERN WA. A COLD FRONT WILL CROSS THE AREA FRIDAY
AFTERNOON OR EVENING. ONSHORE FLOW WILL PREVAIL ON SATURDAY. 33

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...NONE.
PZ...SMALL CRAFT ADVISORY COASTAL WATERS...ENTRANCE TO THE STRAIT OF
     JUAN DE FUCA...NORTHERN INLAND WATERS...ADMIRALTY INLET.

&&

$$

YOU CAN SEE AN ILLUSTRATED VERSION OF THIS FORECAST DISCUSSION AT
WWW.WEATHER.GOV/SEATTLE/GAFD/LATEST_WEBAFD.HTML








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