Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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FXUS66 KSEW 010510
AFDSEW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
910 PM PST SAT FEB 28 2015

.SYNOPSIS...AN UPPER RIDGE AND OFFSHORE FLOW WILL BRING ONE MORE
SUNNY DAY TO WESTERN WASHINGTON SUNDAY. A WEAK WEATHER SYSTEM WILL
MOVE THROUGH THE AREA SUNDAY NIGHT FOR A CHANCE OF LIGHT RAIN. DRY
WEATHER WILL PREVAIL FOR THE REMAINDER OF NEXT WEEK UNDER THE
INFLUENCE OF AN UPPER RIDGE AND LOW LEVEL OFFSHORE FLOW.

&&

.SHORT TERM...STARTING TO SEE SOME UPPER LEVEL CLOUDS DRIFT IN OVER
PORTIONS OF WESTERN WASHINGTON THIS EVENING ON THE LATEST IR
SATELLITE IMAGERY. THIS WAVE LOOKS TO BE IN ADVANCE OF A WEAK
WEATHER SYSTEM EXPECTED TO ARRIVE SUNDAY NIGHT. 00Z GFS AND NAM
SOLUTIONS CONTINUE TO SHOW BEST CHANCES FOR PRECIP TO BE ALONG THE
COAST BUT CHANCES DWINDLE RAPIDLY AS YOU GO INLAND...WITH ANY PRECIP
THERE BEING PRETTY LIGHT AND SHORT LIVED. ECMWF CONTINUES TO BE THE
WETTER SOLUTION AND THUS...AN OUTLIER. WILL CONTINUE TO SIDE WITH
THE DRIER SOLUTIONS AND THE INHERITED FORECAST REFLECTING AN
EMPHASIS ON THE COAST AND NOT SO MUCH ON THE INTERIOR. THIS SYSTEM
DOES NOT LINGER WITH ANY CHANCES OF PRECIP APPROACHING NIL BY MONDAY
MORNING AS UPPER LEVEL RIDGING ONCE AGAIN RETURNS TO THE AREA. THIS
RIDGE WILL REMAIN TUESDAY AND...COUPLED WITH LOW LEVEL OFFSHORE
FLOW...WILL RESULT IN ANOTHER DRY AND MOSTLY SUNNY DAY. SMR

.LONG TERM...THE AFOREMENTIONED UPPER LEVEL RIDGE WILL REMAIN IN
CONTROL WEDNESDAY. WHILE 12Z MODELS SHOWED A DRIER SOLUTION FOR
THURSDAY...18Z AND 00Z RUNS HAVE RETURNED TO THE SOLUTION OF
BRINGING A SHORTWAVE SYSTEM IN FOR THURSDAY AFTERNOON AND THE CHANCE
FOR A QUICK SHOT OF RAIN. RIDGING REBUILDS THURSDAY EVENING...DRYING
THINGS OUT FOR THE REMAINDER OF THE FORECAST PERIOD. TEMPERATURES
WILL BE NEAR NORMAL...HIGHS IN THE LOWER TO MID 50S AND LOWS MOSTLY
IN THE 30S. SMR

&&

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

&&

.AVIATION...DRY NORTHERLY FLOW WILL PREVAIL TONIGHT AND SUNDAY. VFR
CONDITIONS EXPECTED WITH JUST SCT-BKN HIGH CLOUDS. 33

KSEA...VFR CONDITIONS. LIGHT N/NE WINDS AT THE SURFACE. 33

&&

.MARINE...HIGH PRES EAST OF THE CASCADES WILL MAINTAIN OFFSHORE FLOW
ACROSS WESTERN WA TONIGHT AND SUNDAY. A WEAK FRONT WILL MOVE SOUTH
THROUGH THE WATERS SUNDAY NIGHT. NORTH TO NE FLOW WILL DEVELOP
MONDAY NIGHT INTO TUESDAY AS HIGH PRESSURE BUILDS OVER INTERIOR B.C.
THE NORTHERN INLAND WATERS MAY SEE GALES WITH FRASER RIVER OUTFLOW.
WINDS WILL EASE TUESDAY NIGHT. WEAK HIGH PRESSURE WILL BRING
GENERALLY LIGHT WINDS OVER THE WATERS ON WEDNESDAY. 33

&&

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

&&

$$

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





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