Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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000
FXUS66 KSEW 242147
AFDSEW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
250 PM PDT SUN APR 24 2016

.SYNOPSIS...SCATTERED SHOWERS WILL TAPER OFF OVERNIGHT AS AN
UPPER TROUGH OVER WESTERN WASHINGTON WEAKENS. THE TROUGH WILL
BE REPLACED BY AN UPPER RIDGE BY TUESDAY FOR DRY SUNNY WEATHER.
THE REST OF THE WEEK WILL BE MAINLY DRY WITH ONLY WEAK WEATHER
SYSTEMS GIVING WESTERN WASHINGTON A CHANCE OF SHOWERS...MAINLY
ON FRIDAY.

&&

.SHORT TERM...A RESIDUAL TROUGH AXIS OVER WRN WA TONIGHT WILL
KEEP SCATTERED SHOWERS GOING. AFTER THE TROUGH MOVES EAST OF
THE CASCADES MONDAY DRIER NW FLOW ALOFT WILL SHIFT OVER WRN WA
AND THE AIR MASS WILL START TO STABILIZING. MONDAY NIGHT SHOULD
BE MOSTLY CLEAR AND TUESDAY LOOKS LIKE A NICE DAY. MOISTURE AHEAD
OF THE NEXT FRONT WILL GIVE INCREASING CLOUDS IN THE AFTERNOON
AND THERE IS A CHANCE OF LIGHT RAIN OR A LITTLE SHOWER ACTIVITY...
MAINLY ON THE COAST TUE NIGHT AND WED.

.LONG TERM...THURSDAY SHOULD SEE SOME SUNSHINE BEFORE A WEAK
SYSTEM ON FRIDAY BRINGS MORE CLOUDS AND PERHAPS A LITTLE SHOWER
ACTIVITY TO WRN WA. THE WEEKEND LOOKS SUNNY ON THE LATEST GFS
AND EURO WITH AN UPPER RIDGE BUILDING OVER THE REGION.

&&

.AVIATION...AN UPPER LEVEL TROUGH OVER THE PAC NW WILL MAINTAIN
SHOWERS ACROSS WESTERN WA TONIGHT. THE FLOW ALOFT IS SOUTHERLY. THE
AIR MASS IS MOIST AND UNSTABLE. LOW LEVEL ONSHORE FLOW WILL PREVAIL.
MVFR CIGS ARE POSSIBLE IN SHOWERS. SHOWERS WILL TAPER DOWN MONDAY
MORNING AS AN UPPER LEVEL RIDGE SHIFTS INLAND. 33

KSEA...SHOWERS WILL REMAIN IN THE VICINITY TONIGHT. NORTHERLY WINDS
WILL BECOME LIGHT/VARIABLE...THEN SWITCH TO S/SE 09-12Z. MVFR CIGS
POSSIBLE OVERNIGHT.

&&

.MARINE...HIGH PRESSURE OVER THE NE PACIFIC WILL MAINTAIN ONSHORE
FLOW ACROSS WESTERN WASHINGTON. MEANWHILE THE COASTAL WATERS WILL
SEE WEST SWELLS BUILDING TO 10 TO 11 FEET. A WEAK COLD FRONT WILL
DISSIPATE OVER THE COASTAL WATERS EARLY WEDNESDAY. ANOTHER WEAK
FRONT WILL CROSS THE WATERS ON FRIDAY. 33

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...NONE.

PZ...SMALL CRAFT ADVISORY COASTAL WATERS...STRAIT OF JUAN DE
     FUCA...ADMIRALTY INLET.

     SMALL CRAFT ADVISORY FOR ROUGH GRAYS HARBOR BAR.

&&

$$

WWW.WEATHER.GOV/SEATTLE

AN ILLUSTRATED VERSION OF THIS FORECAST DISCUSSION CAN BE SEEN AT
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