Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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FXUS66 KSEW 280956
AFDSEW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
300 AM PDT SAT MAR 28 2015

.SYNOPSIS...SHOWERS WILL MOSTLY END EARLY THIS MORNING AS A FRONT
MOVES INLAND. A WEAK UPPER RIDGE WILL KEEP WEATHER SYSTEMS MAINLY
NORTH OF THE AREA THIS WEEKEND. A COLD FRONT WILL REACH WESTERN
WASHINGTON LATE MONDAY WITH RAIN. A COOL SHOWERY UPPER TROUGH WILL
BE OVER THE AREA FOR MUCH OF THE REST OF THE WEEK.

&&

.SHORT TERM...A FRONT WILL MOVE INLAND THIS MORNING WITH SHOWERS
MOSTLY CONCENTRATED OVER THE CASCADES AND PERHAPS A PUGET SOUND
CONVERGENCE ZONE NORTH OF SEATTLE TODAY.

A BROAD UPPER RIDGE WILL BE OVER THE WESTERN U.S. SUNDAY AND MONDAY.
THIS WILL KEEP THE RAIN THREAT MOSTLY JUST TO THE NORTH OF WESTERN
WASHINGTON. THE COAST AND NORTH CASCADES WILL HAVE THE BEST CHANCE
TO GET A LITTLE RAIN AT TIMES DURING THIS PERIOD. MOST OTHER AREAS
SHOULD BE GENERALLY DRY.

A FRONT WILL REACH THE COAST MONDAY AFTERNOON AND PUSH INTO THE
INTERIOR MONDAY EVENING FOR A ROUND OF RAIN ALL AREAS. SCHNEIDER

.LONG TERM...A BROAD UPPER TROUGH WILL BE OVER THE REGION TUESDAY
THROUGH FRIDAY FOR SHOWERY WEATHER AT TIMES. MODELS SUGGEST AN UPPER
RIDGE WILL BRING DRIER WEATHER THURSDAY. MODELS ARE IN POOR
AGREEMENT WITH HOW THINGS WILL PROGRESS AFTER THAT. SCHNEIDER

&&

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

&&

.AVIATION...THE SMALL UPPER TROUGH OVER WESTERN WASHINGTON EARLY
THIS MORNING WILL MOVE QUICKLY EAST...AND A FLAT UPPER RIDGE WILL
BUILD OVER THE REGION LATER TODAY AND TONIGHT. A WARM FRONT MOVING
OVER THE NORTH SIDE OF THE RIDGE WILL BRUSH THE FORECAST AREA. THE
AIR MASS WILL BE WEAKLY UNSTABLE TODAY WITH MAINLY LOWER LEVEL
MOISTURE...THEN BECOME STABLE TONIGHT WITH INCREASING MOISTURE AT
MID AND HIGH LEVELS.

THERE HAS BEEN COME CLEARING BEHIND THE COLD FRONT THAT MOVED
THROUGH WESTERN WASHINGTON DURING THE NIGHT...BUT MOIST ONSHORE FLOW
SHOULD KEEP CEILINGS GENERALLY IN THE 025-035 RANGE. SHOWERS AND
LOWER CEILINGS TO OVC020 WILL BE MAINLY CONFINED TO THE PUGET SOUND
CONVERGENCE ZONE WILL IT CONTINUES THIS MORNING...AND IT SHOULD
REMAIN NORTH OF SEATTLE. THERE WILL BE IMPROVEMENT THIS AFTERNOON...
AND CONDITIONS SHOULD REMAIN GENERALLY VFR TONIGHT.

KSEA...SOUTHWEST WIND 8-16 KT GUSTING 26 KT...EASING TO 6-12 KT THIS
AFTERNOON...THEN BECOMING SOUTH TONIGHT. THE PUGET SOUND CONVERGENCE
ZONE SHOULD REMAIN NORTH OF SEATTLE.   MCDONNAL

&&

.MARINE...STRONG ONSHORE FLOW THIS MORNING WILL EASE TODAY AS HIGH
PRESSURE BUILDS OVER THE REGION. GALE FORCE WESTERLIES IN THE
CENTRAL STRAIT OF JUAN DE FUCA AND EAST ENTRANCE STRAIT WILL
CONTINUE FOR SEVERAL MORE HOURS THIS MORNING...THEN EASE LATE THIS
MORNING AND AFTERNOON.

A WARM FRONT WILL BRUSH THE AREA AS IT MOVES INTO SOUTHERN BRITISH
COLUMBIA LATE TODAY THROUGH SUNDAY NIGHT. IT WILL PRODUCE SMALL
CRAFT ADVISORY SOUTHERLIES OVER THE COASTAL WATERS AND AT THE WEST
ENTRANCE STRAIT...WITH SMALL CRAFT ADVISORY WINDS LIKELY AT TIMES
FOR THE INLAND WATERS SUNDAY AND SUNDAY NIGHT.

A COLD FRONT WILL MOVE THROUGH THE FORECAST AREA FROM THE WEST
MONDAY WITH WIDESPREAD SMALL CRAFT ADVISORY WINDS. ONSHORE FLOW WILL
FOLLOW THE COLD FRONT MONDAY NIGHT AND TUESDAY.   MCDONNAL

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...NONE.
PZ...GALE WARNING CENTRAL STRAIT AND EAST ENTRANCE STRAIT.
     SMALL CRAFT ADVISORY ALL OTHER WATERS.

&&

$$

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







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