Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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FXUS66 KSEW 031558 CCA
AFDSEW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
900 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 ARE MORNING LOW CLOUDS OVER MAINLY GRAYS HARBOR COUNTY AND
NEARLY INLAND TO SHELTON THAT WILL BURN OFF BY MIDDAY. ELSEWHERE IT
IS SUNNY. 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 GIVE THE AREA A VERY WARM DAY...
HEAT ADVISORIES WILL PROBABLY NEED TO EXTENDED THROUGH SATURDAY AND
THEN EVENTUALLY SUNDAY.

.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...STRONG HIGH PRESSURE REMAINS OFFSHORE WHILE AN UPPER
LEVEL LOW SPINS OVER NORTHERN B.C. THE FLOW ALOFT OVER WESTERN WA IS
W/NW. THE AIR MASS IS DRY. LOW LEVEL STRATUS CLOUDS ARE OVER THE
CENTRAL COAST AND CHEHALIS GAP THIS MORNING...WHICH WILL ERODE THIS
AFTERNOON. ELSEWHERE...SKIES ARE CLEAR FOR VFR CONDITIONS. A WEAK
ONSHORE PUSH WILL BRING STRATUS CLOUDS BACK TO THE COAST OVERNIGHT.
33

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

&&

.MARINE...STRONG HIGH PRES REMAINS OVER THE NE PAC WITH SLIGHTLY
LOWER PRES INLAND. THE RESULT IS LIGHT ONSHORE FLOW ACROSS WESTERN
WA. MODELS SHOW N/NW WINDS OF 15 TO 25 KT OVER THE OUTER COASTAL
WATERS - A SMALL CRAFT ADVISORY IS IN EFFECT. WESTERLY WINDS WILL
ALSO INCREASE THROUGH THE CENTRAL/EAST STRAIT OF JUAN DE FUCA THIS
AFTERNOON AND EVENING AND A SMALL CRAFT ADVISORY IS IN EFFECT AS
WELL.

OFFSHORE FLOW WILL DEVELOP THIS WEEKEND AS A THERMAL TROUGH OF LOW
PRES FORMS ALONG THE COAST. THE FLOW WILL FLIP BACK TO ONSHORE ON
MONDAY AS LOW PRES SHIFTS INLAND. 33

&&

.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.

&&

$$

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