Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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FXUS66 KSEW 030932
AFDSEW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
230 AM PDT FRI JUL 3 2015

.SYNOPSIS...HIGH PRESSURE ALOFT WILL REMAIN OVER THE PACIFIC
NORTHWEST INTO AT LEAST EARLY NEXT WEEK FOR CONTINUED SUNNY
AND UNSEASONABLY WARM WEATHER.

&&

.SHORT TERM...SLIGHTLY STRONGER LOW LEVEL ONSHORE FLOW WILL RESULT
IN A FEW DEGREES COOLING TODAY BUT HIGHS WILL CONTINUE TO BE WELL
ABOVE NORMAL AND A HEAT ADVISORY IS IN EFFECT FROM SEATTLE SOUTH.
THERE SHOULD BE SOME LOW CLOUDS AT THE COAST AND PARITALLY INLAND TO
ABOUT SHELTON THIS MORNING WITH THE STRONGER ONSHORE FLOW. OTHERWISE
IT WILL BE ANOTHER SUNNY DAY.

SATURDAY SHOULD BE PRETTY SIMILAR TO TODAY. UPPER HEIGHTS WILL FALL
SLIGHTLY WHILE LOW LEVEL ONSHORE FLOW WILL WEAKEN SLIGHTLY. CLOUDS
AND TEMPERATURES SHOULD TURN OUT TO BE ABOUT THE SAME.

LOW LEVEL OFFSHORE FLOW WILL DEVELOP SUNDAY WITH A THERMAL TROUGH
ALONG THE COAST. THIS SHOULD RESULT IN A VERY WARM DAY...EVEN
FOR THE COAST. HEAT ADVISORIES WILL PROBABLY NEED TO EXTENDED
THROUGH SATURDAY AND THEN EVENTUALLY SUNDAY. SCHNEIDER

.LONG TERM...LOW LEVEL ONSHORE FLOW WILL RETURN NEXT WEEK BUT
COOLING WILL BE GRADUAL AND HIGHS WILL REMAIN WELL ABOVE NORMAL FOR
MUCH OF THE WEEK. LATEST MODELS ACTUALLY SHOW TEMPERATURES BUMPING
UP AGAIN WEDNESDAY BEFORE COOLING A LITTLE AGAIN ON THURSDAY. DRY
WEATHER IS EXPECTED TO CONTINUE. SCHNEIDER

&&

.AVIATION...A FLAT UPPER RIDGE WILL REMAIN OVER THE REGION THROUGH
TONIGHT WITH WESTERLY FLOW ALOFT OVER WESTERN WASHINGTON. LIGHT
ONSHORE LOW LEVEL FLOW WILL TREND WEAKLY OFFSHORE TONIGHT. THE AIR
MASS WILL REMAIN DRY EXCEPT FOR SHALLOW SURFACE-BASED MARINE
MOISTURE NEAR THE COAST.

MARINE STRATUS HAS MOVED ONTO THE COAST...AND IT SHOULD MOVE UP
THE LOWER CHEHALIS VALLEY TO AROUND SHELTON BY DAY BREAK. THE
STRATUS WILL LIKELY BURN BACK TO THE COAST BY LATE MORNING...THEN
PUSH INTO THE LOWER CHEHALIS VALLEY AGAIN TONIGHT. OTHERWISE SKIES
WILL BE GENERALLY CLEAR.

KSEA...N WIND 4-10 KT...BECOMING NW MIDDAY TODAY.   MCDONNAL

&&

.MARINE...WEAK ONSHORE FLOW WILL CONTINUE THROUGH THIS
EVENING...WITH HIGH PRESSURE WELL OFFSHORE AND LOW PRESSURE OVER
EASTERN WASHINGTON. SMALL CRAFT ADVISORY NORTHWEST WINDS WILL
CONTINUE OVER THE OUTER COASTAL WATERS...WITH MARGINAL SMALL CRAFT
ADVISORY WESTERLIES IN THE CENTRAL STRAIT OF JUAN DE FUCA AND
EASTERN ENTRANCE STRAIT THIS EVENING.

LOW PRESSURE WILL DEVELOP ALONG THE WASHINGTON COAST LATE
TONIGHT AND HIGH PRESSURE WILL MOVE INTO BRITISH COLUMBIA.
THIS WILL RESULT IN WEAK OFFSHORE FLOW DURING THE WEEKEND...AND
WINDS SHOULD GENERALLY BE 20 KT OR LESS. WEAK ONSHORE FLOW
WILL PROBABLY RESUME MONDAY AND TUESDAY.   MCDONNAL

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...HEAT ADVISORY FOR SEATTLE...BELLEVUE...TACOMA...AND EAST PUGET
     SOUND LOWLANDS ZONES.
PZ...SMALL CRAFT ADVISORY OUTER COASTAL WATERS...CENTRAL AND EAST
     STRAIT OF JUAN DE FUCA.

&&

$$

YOU CAN SEE AN ILLUSTRATED VERSION OF THIS FORECAST DISCUSSION AT
WWW.WEATHER.GOV/SEATTLE/GAFD/LATEST_WEBAFD.HTML  - TEMPORARILY OUT
OF SERVICE DURING A SOFTWARE UPDATE PERIOD.

WWW.WEATHER.GOV/SEATTLE/



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