Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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000
FXUS66 KSEW 280400
AFDSEW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
900 PM PDT MON JUL 27 2015

.SYNOPSIS...THE UPPER TROUGH THAT MOVED THROUGH THE AREA OVER THE
WEEKEND HAS MOVED EAST TO MONTANA. AN UPPER LEVEL RIDGE WILL BUILD
OVER THE PACIFIC NORTHWEST THROUGH MIDWEEK. SUNNY DAYS AND MUCH
WARMER WEATHER WILL RETURN TO THE REGION THROUGH THE WEEK AHEAD.

&&

.SHORT TERM...UPPER HEIGHTS RISE...THE AIR DRIES AND WARMS...AND
SUMMER WARMTH WILL RETURN TO THE REGION THROUGH THE WEEK AHEAD.
TEMPS WILL WARM TUE AND WED THEN PROBABLY PLATEAU AROUND THU.
LINGERING LOW LEVEL MOISTURE TONIGHT AND TUESDAY MORNING WILL GIVE
WAY TO SUNSHINE BY TUE AFTERNOON AND THEN SUNNY DAYS AND CLEAR
NIGHTS SHOULD PREVAIL THROUGH THE WEEK.

.LONG TERM...A BROAD UPPER RIDGE SHOULD REMAIN OVER THE WRN U.S. AND
CONTINUE TO KEEP WRN WA WARM AND DRY. THE CENTER OF THERMALLY
INDUCED LOW PRESSURE SHOULD STAY OVER EASTERN WA BUT NOTHING MORE
THAN SHALLOW MARINE AIR IS LIKELY TO AFFECT WRN WA SO TEMPS SHOULD
BE WELL ABOVE NORMAL BUT OVER THE INLAND PORTION OF WRN WA BUT NOT
ESPECIALLY WARM ALONG THE COAST. HIGHS SHOULD RANGE FROM THE LOWER
TO MID 70S ALONG THE OCEAN BEACHES TO THE MID 80S TO LOWER 90S
ACROSS THE INTERIOR OF WRN WA.

&&

.AVIATION...UPPER LEVEL RIDGE OVER WESTERN WASHINGTON WITH
NORTHWESTERLY FLOW ALOFT THROUGH TUESDAY AFTERNOON. LIGHT FLOW IN
THE LOWER LEVELS. AIR MASS STABLE.

SATELLITE IMAGERY SHOWS SC DECK FLOATING OFF OLYMPICS INTO THE
CENTRAL AND SOUTHERN PUGET SOUND AREA ALL THE WAY TO NEAR MOUNT
RAINIER. CEILINGS ASSOCIATED WITH THE DECK NEAR 6000 FEET. THESE
CLOUDS WILL DISSIPATE AFTER MIDNIGHT. WITH THE LIGHT LOW LEVEL FLOW
LOW STRATUS CONFINED TO THE COAST TUESDAY MORNING AND EVEN THAT WILL
BE BRIEF WITH LITTLE IN THE WAY OF CEILINGS EXPECTED OVER THE ENTIRE
AREA BY MID TO LATE MORNING.

KSEA...CLOUD DECK AROUND 6000 FEET DISSIPATING OVERNIGHT. JUST SOME
HIGH CLOUDS ON TUESDAY. LIGHT NORTHERLY WINDS BECOMING VARIABLE 12Z-
18Z THEN BECOMING NORTHERLY 6 TO 9 KNOTS. FELTON

&&

.MARINE... HIGH PRES OFFSHORE WITH LOWER PRES EAST OF THE CASCADES
WILL KEEP THE FLOW ONSHORE THROUGH THURSDAY ALTHOUGH THE FLOW WILL
BECOME BRIEFLY OFFSHORE OR NORTHERLY WED NIGHT. SMALL CRAFT ADVISORY
WESTERLIES IN THE CENTRAL AND EASTERN STRAIT WILL EASE LATE TONIGHT.
ANOTHER ROUND OF SMALL CRAFT ADVISORY WESTERLIES EXPECTED TUESDAY
EVENING. FELTON

&&

.SEW WATCHES/WARNINGS/ADVISORIES... WA...NONE. PZ...SMALL CRAFT
ADVISORY IN EFFECT TIL 3 AM PDT TUESDAY FOR THE CENTRAL AND EASTERN
STRAIT OF JUAN DE FUCA.

&&

$$

WWW.WEATHER.GOV/SEATTLE

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