Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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000
FXUS66 KSEW 020500
AFDSEW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
900 PM PST SUN MAR 1 2015

.SYNOPSIS...A WEAK WEATHER SYSTEM WILL MOVE SOUTHEAST THROUGH THE
AREA TONIGHT FOR AREAS OF LIGHT PRECIPITATION. DRY WEATHER WILL
PREVAIL THE REMAINDER OF THE WEEK UNDER THE INFLUENCE OF AN UPPER
RIDGE AND LOW LEVEL OFFSHORE FLOW.

&&

.SHORT TERM...LIGHT SHOWERS ALONG THE COAST AS PER CURRENT RADAR
IMAGERY...WHILE...LOOKING AT OBS...NOT MUCH IN THE WAY OF PRECIP IS
MAKING IT EAST OF PUGET SOUND. SHORT TERM MODELS REMAIN CONSISTENT
IN FOCUSING THEIR ATTENTION ON COASTAL AREAS FOR PRECIP...BUT STILL
WOULD NOT RULE OUT A STRAY BIT OF RAIN INLAND EITHER. AS
SUCH...INHERITED FORECAST HOLDING TOGETHER NICELY.

MODELS REMAIN CONSISTENT WITH THIS SYSTEM EXITING THE AREA
QUICKLY...FOLLOWED BY UPPER LEVEL RIDGING BUILDING OVER THE EASTERN
PACIFIC. HELPING TO DRY OUT CONDITIONS ALONG WITH THIS RIDGE IS LOW
LEVEL NORTH TO NORHTEAST OFFSHORE FLOW AT THE SURFACE IS EXPECTED TO
INCREASE AS A 1040 MB SURFACE HIGH DROPS SOUTH INTO BRITISH
COLUMBIA. THIS WILL HELP DIMINISH CLOUDS AS THE DAY PROGRESSES
MONDAY. THERE WILL ALSO BE SOME BREEZY NORTH WINDS DURING THE
DAY...ESPECIALLY OVER THE NORTH INTERIOR.

UPPER LEVEL RIDGING WILL REMAIN IN PLACE OVER THE NORTHEAST
PACIFIC BRINGING DRY AND MAINLY SUNNY WEATHER TUESDAY AND WEDNESDAY
ALTHOUGH THERE COULD BE SOME HIGH CLOUDS AT TIMES...ESPECIALLY ON
TUESDAY. SMR/SCHNEIDER

.LONG TERM...FROM 230 PM DISCUSSION...AN UPPER RIDGE WILL REMAIN
OVER THE AREA THURSDAY THROUGH SUNDAY...KEEPING THE WEATHER MAINLY
DRY. SHORT WAVE ENERGY COMING OVER THE TOP OF THE RIDGE THURSDAY
THROUGH FRIDAY COULD BRING A FEW SHOWERS TO THE FAR NORTHERN ZONES
BUT THIS DOES NOT LOOK LIKE IT WILL AMOUNT TO MUCH FOR NOW.
OTHERWISE...IT LOOKS LIKE A FAIRLY DIRTY RIDGE THURSDAY AND FRIDAY
WITH HIGH CLOUDS AND PARTLY SUNNY SKIES. SCHNEIDER

&&

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

&&

.AVIATION...A COLD FRONT WILL SPREAD LIGHT RAIN TO WESTERN WA
TONIGHT. THE FLOW ALOFT IS NORTHERLY. MVFR CIGS ARE LIKELY BEHIND
THIS FRONT LATE TONIGHT. SKIES WILL CLEAR FROM NORTH TO SOUTH MONDAY
AFTERNOON AS OFFSHORE FLOW DEVELOPS. 33

KSEA...NORTH WINDS AT THE SURFACE. CIGS LOWERING OVERNIGHT WITH MVFR
CONDITIONS BY 09-12Z. LOW LEVEL CLOUDS WILL SCATTER OUT MON
AFTERNOON...WITH CLEAR SKIES MON EVENING. 33

&&

.MARINE...A COLD FRONT WILL TRACK SOUTH THROUGH WESTERN WA TONIGHT
WITH SMALL CRAFT ADVISORY N/NW WINDS OVER THE COASTAL WATERS. HIGH
PRESSURE WILL BUILD OVER INTERIOR B.C. ON MONDAY WITH N/NE WINDS
ACROSS WESTERN WA. SMALL CRAFT ADVISORIES ARE LIKELY FOR ALL MARINE
ZONES. GALES ARE POSSIBLE MON NIGHT OVER THE NORTHERN INLAND WATERS
WITH FRASER RIVER OUTFLOW. OFFSHORE WINDS WILL EASE ON TUE. WEAK
HIGH PRES WILL REMAIN OVER THE REGION WEDNESDAY AND THURSDAY FOR
GENERALLY LIGHT WINDS. 33

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...NONE.
PZ...SMALL CRAFT ADVISORY COASTAL WATERS TONIGHT.
     GALE WATCH N INLAND WATERS MONDAY NIGHT.
&&

$$

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




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