Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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000
FXUS66 KSEW 262137
AFDSEW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
245 PM PDT SUN JUL 26 2015

.SYNOPSIS...SHOWERS WILL DIMINISH LATER TONIGHT AND MONDAY MORNING
AS AN UPPER TROUGH MOVES EAST OF THE CASCADES. A BROAD UPPER LEVEL
RIDGE WILL BUILD OVER THE REGION TUESDAY AND KEEP CONDITIONS DRY AND
WARM THROUGH THE END OF THE WEEK.

&&

.SHORT TERM...RADAR IS LIT UP WITH SHOWERS AND THERE HAVE BEEN A FEW
LIGHTNING STRIKES. FORECAST OF SHOWERS AND A CHANCE OF EVENING
THUNDERSTORMS IS ON TRACK. HAVE ADDED THE NORTHERN INTERIOR OF
WESTERN WASHINGTON TO THE AREA THAT MIGHT HAVE THUNDERSTORMS THIS
EVENING. HIGHS TODAY WILL PEAK AROUND 70.

SHOWERS SHOULD TAPER SIGNIFICANTLY OVERNIGHT AS THE UPPER LEVEL
TROUGH MOVES AWAY TO THE EAST. LINGERING SHOWERS ARE POSSIBLE MONDAY
IN THE CASCADES AND PERHAPS IN THE FAR SOUTH IN THE MORNING. HEIGHTS
BUILD MONDAY AFTERNOON AND SKIES WILL CLEAR SOMEWHAT. HIGHS WILL BE
MAINLY IN THE 70S.

AFTER SOME MORNING CLOUDS TUESDAY WILL BE SUNNY. HEIGHTS WILL SOAR
INTO THE 580S AS THE EASTERN PACIFIC UPPER HIGH BUILDS INTO THE
AREA. THIS WILL BRING INLAND HIGH TEMPERATURES INTO THE LOW TO MID
80S FROM ABOUT SEATTLE SOUTH...WITH 70S ELSEWHERE. ON WEDNESDAY THE
PATTERN CONTINUES WITH HEIGHTS SLIGHTLY HIGHER AND HIGHS ALSO RISING
ANOTHER FIVE DEGREES OR SO...80S INLAND WITH LOW 90S IN THE SOUTH
AND MID 70S ON THE COAST. BURKE

.LONG TERM...NO CHANGE IN THE PATTERN THROUGH NEXT WEEKEND. DAYS
WILL BE SUNNY AND NIGHTS WILL BE CLEAR. THE HIGHEST HEIGHTS ARE ON
THURSDAY WITH HIGH TEMPERATURES IN THE 80S TO LOW 90S EXCEPT FOR 70S
ON THE COAST. THERE IS SLIGHT COOLING AFTER THAT BUT HIGHS EACH DAY
FROM SEATTLE SOUTH WILL REMAIN IN THE 85-90 RANGE. BURKE.

&&

.AVIATION...AN UPPER TROUGH OVER THE AREA WILL MOVE EAST TONIGHT AND
MONDAY. WESTERLY FLOW ALOFT TODAY WILL BECOME NORTHERLY TONIGHT. AT
THE SURFACE...ONSHORE FLOW WILL CONTINUE WITH HIGH PRESSURE OFFSHORE
AND LOWER PRESSURE INLAND. AIR MASS MOIST AND UNSTABLE...BECOMING
STABLE TONIGHT.

MOSTLY MID CLOUDS THIS EVENING WITH SOME LOWER CEILING POSSIBLE NEAR
STRONGER SHOWERS. LOW CLOUDS FILLING IN TONIGHT...WITH CLOUDS
LIFTING AND BREAKING UP MONDAY AFTERNOON.

KSEA...MID CLOUDS THIS EVENING WITH AN ISOLATED THUNDERSTORM
POSSIBLE EARLY IN THE EVENING. LOW CLOUDS EXPECTED TO DEVELOP LATE
TONIGHT. SOUTHERLY WIND 4-8 KNOTS SHOULD SWITCH TO NORTHERLY BY
EARLY EVENING...THEN BECOMING LIGHT SOUTHERLY AGAIN AFTER MIDNIGHT.
SCHNEIDER

&&

.MARINE...ONSHORE FLOW WILL PREVAIL THIS WEEK...POSSIBLY EASING A
BIT WEDNESDAY AND THURSDAY...WITH HIGH PRESSURE OFFSHORE AND LOWER
PRESSURE INLAND. SMALL CRAFT ADVISORY WEST WINDS ARE LIKELY EACH
EVENING IN THE CENTRAL AND EAST STRAIT. SCHNEIDER

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...NONE.
PZ...SMALL CRAFT ADVISORY CENTRAL AND EASTERN STRAIT OF JUAN DE FUCA.

&&

$$

WWW.WEATHER.GOV/SEATTLE

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


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