Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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FXUS66 KSEW 020930
AFDSEW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
230 AM PDT THU JUL 2 2015

.SYNOPSIS...HIGH PRESSURE ALOFT WILL REMAIN OVER THE PACIFIC
NORTHWEST INTO EARLY NEXT WEEK FOR HOT AND DRY WEATHER.

&&

.SHORT TERM...AN UPPER RIDGE OVER THE AREA WILL SHIFT WEST OVER THE
EASTERN PACIFIC THE NEXT FEW DAYS. AT THE SURFACE...ONSHORE FLOW
WILL PREVAIL. TODAY WILL BE THE WARMEST DAY OUT OF THE NEXT THREE.
HIGHS IN THE LOWER 90S WILL BE COMMON OVER THE INTERIOR FROM ABOUT
SEATTLE SOUTH. A HEAT ADVISORY IS IN EFFECT THROUGH THIS EVENING
FOR THIS. OTHER THAN SOME POSSIBLE LOW CLOUDS RIGHT ALONG THE
COAST THIS MORNING...IT WILL BE ANOTHER SUNNY DAY TODAY.

ONSHORE FLOW WILL INCREASE A BIT ON FRIDAY AND UPPER HEIGHTS WILL
FALL SLIGHTLY OVER THE AREA. THE NET RESULT SHOULD BE A FEW
DEGREES OF COOLING. HIGHS WILL STILL BE WELL ABOVE NORMAL
HOWEVER...MOSTLY IN THE 80S OVER THE INTERIOR AND 70S NEAR THE
COAST AND WATER. THERE WILL PROBABLY BE A BIT MORE LOW CLOUDS NEAR
THE COAST FRIDAY MORNING WITH STRONGER ONSHORE FLOW.

UPPER HEIGHTS WILL CONTINUE TO GRADUALLY FALL ACROSS THE AREA ON
SATURDAY AS AN UPPER TROUGH MOVES OVER THE NORTHERN ROCKIES. LOW
LEVEL FLOW ACTUALLY WEAKENS AND BEGINS TO TURN OFFSHORE WHICH
SHOULD OFFSET ANY MINOR COOLING FROM THE LOWERING UPPER HEIGHTS.
HIGHS WILL BE ABOUT THE SAME AS FRIDAY...WELL ABOVE NORMAL.
SCHNEIDER

.LONG TERM...SUNDAY SHOULD BE THE WARMEST DAY OF THE
WEEK...POSSIBLY THE WARMEST DAY OF THE YEAR SO FAR IN SOME
LOCATIONS. LOW LEVEL OFFSHORE FLOW WILL PEAK WHICH WILL ALLOW
HIGHS TO WARM INTO THE LOWER TO MID 90S FOR THE INTERIOR. EVEN THE
COAST SHOULD BE VERY WARM IN THIS PATTERN.

ONSHORE FLOW WILL RETURN MONDAY THROUGH WEDNESDAY BUT IT WILL NOT
EVER GET VERY STRONG. HIGHS SHOULD WILL COOL SEVERAL DEGREES
MONDAY...BUT MID TO UPPER 80S WILL STILL BE COMMON FROM SEATTLE
SOUTH. SEVERAL MORE DEGREES OF COOLING SHOULD OCCUR TUESDAY WITH
HIGHS ONLY A FEW DEGREES ABOVE NORMAL. THERE DOES NOT APPEAR TO BE
ANY THREAT OF PRECIPITATION THROUGH THE MIDDLE OF NEXT WEEK.
SCHNEIDER

&&

.AVIATION...WESTERLY FLOW ALOFT OVER WESTERN WASHINGTON WILL
CONTINUE THROUGH TONIGHT...WITH LIGHT ONSHORE FLOW AT LOW LEVELS.
THE AIR MASS WILL REMAIN DRY EXCEPT FOR SHALLOW SURFACE-BASED
MARINE MOISTURE.

SKIES WILL BE GENERALLY CLEAR THROUGH TONIGHT...EXCEPT FOR AREAS OF
LATE NIGHT AND MORNING STRATUS ALONG THE COAST.

KSEA...NORTH TO NORTHEAST WIND 4-10 KT...BECOMING NORTHWEST MIDDAY
TODAY...THEN NORTH TO NORTHEAST AGAIN AFTER SUNSET. MCDONNAL

&&

.MARINE...WEAK ONSHORE FLOW WILL CONTINUE THROUGH FRIDAY NIGHT...
WITH HIGH PRESSURE WELL OFFSHORE AND LOW PRESSURE OVER EASTERN
WASHINGTON. SMALL CRAFT ADVISORY NORTHWEST WINDS WILL CONTINUE OVER
THE OUTER COASTAL WATERS...WITH SMALL CRAFT ADVISORY WESTERLIES IN
THE CENTRAL STRAIT OF JUAN DE FUCA AND EASTERN STRAIT DURING THE
EVENING TO EARLY MORNING HOURS.

LOW PRESSURE WILL DEVELOP ALONG THE WASHINGTON COAST THIS WEEKEND
AND HIGH PRESSURE WILL MOVE INTO SOUTHWEST CANADA. THE
RESULT WILL BE OFFSHORE FLOW AND WINDS SHOULD REMAIN 20 KT OR LESS.
WEAK ONSHORE FLOW WILL PROBABLY RESUME MONDAY. MCDONNAL

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...HEAT ADVISORY UNTIL 9 PM PDT THIS EVENING FOR
     WAZ509-555-556-558.
PZ...SMALL CRAFT ADVISORY OUTER COASTAL WATERS...CENTRAL AND
     EAST STRAIT OF JUAN DE FUCA.

&&

$$


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