Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

000
FXUS66 KSEW 032214
AFDSEW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
230 PM PST TUE MAR 3 2015

.SYNOPSIS...HIGH PRESSURE AND OFFSHORE FLOW WILL GIVE FAIR WEATHER
THROUGH WEDNESDAY. A WEAK FRONT WILL BRUSH THE NORTH PART OF WESTERN
WASHINGTON THURSDAY. HIGH PRESSURE WILL REBUILD FOR THE WEEKEND.

&&

.SHORT TERM...THERE IS AN UPPER RIDGE OFFSHORE WITH NORTHERLY FLOW
ALOFT OVER THE PACIFIC NORTHWEST. THERE IS A LITTLE CIRRUS BUT NOT
MUCH. LOW TEMPS TONIGHT WILL BE FROSTY AGAIN. THERE IS SURFACE HIGH
PRESSURE INLAND WITH LOWER PRESSURE OVER CALIF WHICH EXTENDS
SOMEWHAT NORTH ALONG THE OREGON AND WA COASTAL WATERS...THIS IS
GIVING LIGHT OFFSHORE FLOW. THE AIR IS STABLE AND MAINLY DRY.

THE RIDGE WILL WEAKEN ON WEDNESDAY AS THE OFFSHORE RIDGE FLATTENS
AND SHIFTS EAST OVER THE AREA. A WEAK UPPER LEVEL SHORT WAVE TROUGH
AND ASSOCIATED FRONTAL SYSTEM WILL MOVE INTO BRITISH COLUMBIA
THURSDAY. OVER WESTERN WA CLOUDS WILL INCREASE THU AND THERE IS A
CHANCE OF RAIN IN THE FORECAST FOR THE NORTHERNMOST PORTION OF WRN
WA...MAYBE WE WILL SQUEEZE A LITTLE DRIZZLE OR A SHOWER OR TWO FROM
THAT.

.LONG TERM...ANOTHER UPPER LEVEL RIDGE WILL BUILD INTO THE WEEKEND.
SURFACE HIGH PRESSURE WITH A MILD AIR MASS AND SOME SUNSHINE SHOULD
GIVE HIGHS HIGHS IN THE MID 50S TO LOWER 60S AND LOWS AROUND 40. IT
LOOKS DRY NEXT WEEKEND THROUGH EARLY NEXT WEEK.

&&

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

&&

.AVIATION...AN UPPER RIDGE CENTERED OFF THE COAST WILL KEEP THE FLOW
ALOFT NLY THRU WED. THE LOW LEVEL FLOW WILL REMAIN LIGHT OFFSHORE
THRU WED MORNING. THERE MIGHT BE LOCALIZED FOG /VSBYS AOB 1SM/ AND
INDEFINITE CIGS AOB 300 FT W OF A LINE FROM KSHN-KOLM-KTDO AFTER
0600 UTC.

KSEA...VFR CONDITIONS ARE EXPECTED. WINDS WILL GENERALLY BE LIGHT
AND VARIABLE.

&&

.MARINE...
HIGH PRES E OF THE CASCADES WITH LOWER PRES ALONG OR JUST OFF THE
WASHINGTON COAST WILL RESULT IN LIGHT OFFSHORE FLOW TONIGHT. THE
FLOW WILL BECOME WEAK ONSHORE ON WED DUE TO HIGHER PRES BUILDING
OVER THE COASTAL WATERS. LIGHT ONSHORE FLOW WILL CONTINUE ON THU.

&&

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

&&

$$

WWW.WEATHER.GOV/SEATTLE

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










USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.