Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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000
FXUS66 KSEW 271049
AFDSEW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
330 AM PDT MON JUL 27 2015

.SYNOPSIS...THE UPPER LEVEL TROUGH THAT BROUGHT SHOWERS TO THE
REGION SUNDAY WILL MOVE IDAHO THIS MORNING ALLOWING UPPER LEVEL
HEIGHTS TO BUILD OVER MUCH OF THE NORTHWEST TODAY. A BROAD UPPER
LEVEL RIDGE WILL BEGIN TO BUILD OVER THE WESTERN US
TUESDAY...KEEPING CONDITIONS DRY AND WARM THROUGH THE END OF THE
WEEK.

&&

.SHORT TERM...SHOWERS HAVE DIMINISHED OVER THE AREA TO A FEW ISOLATED
SPOTS OVER THE CASCADES AS THE UPPER LEVEL TROUGH THAT HAS BEEN OVER
THE AREA CONTINUES TO WORK ITS WAY INTO EASTERN WASHINGTON THIS
MORNING. RESIDUAL MOISTURE HAS PRODUCED A MIXED BAG OF CLOUD COVER
THIS MORNING WILL GIVE WAY TO PARTLY TO MOSTLY SUNNY SKIES AND
WARMER TEMPERATURES TODAY. HIGHS WILL LIKELY RUN AROUND 5 DEGREES
WARMER OVER SUNDAY...RISING INTO THE MID 70SS OVER MUCH OF THE
INTERIOR AND MID TO HIGH 60S ALONG THE COAST AND STRAIT. UPPER LEVEL
RIDGING WILL BEGIN TO BUILD OVER THE REGION TONIGHT WITH HEIGHTS
GRADUALLY RISING OVER THE PACIFIC NORTHWEST THROUGH WEDNESDAY.
TEMPERATURES WILL ALSO GRADUALLY RISE TUESDAY AND WEDNESDAY...ABOUT
5 DEGREES WARMER EACH DAY WITH HIGHS EXPECTED TO WORK INTO THE MID
80S OVER MUCH OF THE INTERIOR BY WEDNESDAY.

.LONG TERM...THE WARM AND DRY PATTERN WILL PERSIST THROUGH THE
WEEKEND AS A BROAD UPPER LEVEL RIDGE BECOMES ESTABLISHED OVER THE
WESTERN US. HEIGHTS OVER THE PACIFIC NORTHWEST PEAK ON THURSDAY
HINTING THAT IT WILL BE THE WARMEST DAY WITH HIGH TEMPERATURES
REACHING THE UPPER 80S TO LOW 90S OVER THE INTERIOR...AND MID 70S
ALONG THE COAST AND STRAIT. SLIGHT COOLING CONTINUES TO BE EXPECTED
INTO THE WEEKEND WITH HIGHS EACH DAY FROM SEATTLE SOUTH REMAINING IN
THE MID TO UPPER 80S.

&&

.AVIATION...LIGHT N-NW FLOW ALOFT TODAY IN THE WAKE OF AN UPPER
TROUGH NOW EAST OF THE REGION. LIGHT ONSHORE FLOW WILL CONTINUE AT
THE SURFACE WITH HIGH PRESSURE OFFSHORE AND LOWER PRESSURE INLAND.
STABLE AND DRY IN THE MID AND UPPER LEVELS. LOW LEVEL MOISTURE IN
PLACE TODAY WILL GRADUALLY DECREASE TONIGHT THROUGH TUESDAY. AREAS
OF MVFR STRATUS THIS MORNING WILL LIFT TO VFR BY 18Z...AND PARTIALLY
SCATTER OUT LATE IN THE DAY OR THIS EVENING.

KSEA...MVFR STRATUS SHOULD EXPAND THIS MORNING AND AFFECT THE KSEA
TERMINAL AT TIMES THROUGH 18Z. CIGS WILL RISE TO 5-6K FT THIS
AFTERNOON...BUT COULD BE SLOW TO SCATTER...POSSIBLY NOT UNTIL
TONIGHT. VARIABLE WIND TO 5 KT...THEN W-NW WIND 4 TO 6 KT AFTER 20Z.

&&

.MARINE...LIGHT ONSHORE FLOW WILL PREVAIL THROUGH THE WEEK.
GRADIENTS THROUGH THE STRAIT OF JUAN DE FUCA WILL BE STRONG ENOUGH
EACH EVENING TO GIVE SMALL CRAFT WINDS TO THE CENTRAL AND EAST
PORTION. LIGHT NORTHERLY FLOW MAY DEVELOP OVER THE INTERIOR WATERS
BY WEDNESDAY.


&&

.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
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