Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
000
FXUS66 KSEW 031632 CCA
AFDSEW

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE SEATTLE WA
931 AM PDT WED JUN 3 2015

CORRECTED A TYPO IN THE FIRST SENTENCE OF THE SHORT TERM SEGMENT.

.SYNOPSIS...A WEAK LOW PRESSURE SYSTEM ALOFT WILL REMAIN OVER THE
AREA TODAY FOR SCATTERED SHOWERS. LOOK FOR HIGH PRESSURE ALOFT TO
BEGIN BUILDING OVER THE REGION ON THURSDAY. HIGH PRESSURE ALOFT
COMBINED WITH LIGHT ONSHORE FLOW WILL RESULT IN DRY AND WELL ABOVE
NORMAL TEMPERATURES ACROSS MUCH OF THE AREA FRIDAY THROUGH THIS
WEEKEND.

&&

.SHORT TERM...
THERE WERE A FEW SHOWERS OVER THE CWA AT THIS TIME. EARLIER...THERE
WAS A CONVERGENCE ZONE ALONG THE KING AND SNOHOMISH COUNTY BORDER.
IT APPEARED THAT THIS CONVERGENCE ZONE WAS DISSIPATING.
UNFORTUNATELY...THE CLOUDS WITHIN THE CONVERGENCE ZONE WAS LOW-
TOPPED...THUS KATX WSR-88D WAS NOT ABLE TO SAMPLE IT. PER
COCORAHS...THERE WAS A VERY NARROW BAND OF RAINFALL AMOUNTS THAT
WERE IN THE HALF TO ONE INCH RANGE IN SHOHOMISH COUNTY.

MEANWHILE...A WEAK UPPER TROF WILL REMAIN OVER THE REGION TODAY
FOR SCATTERED SHOWERS...MORE NUMEROUS THIS AFTERNOON. TEMPERATURES
SHOULD BE NEAR NORMAL TODAY. THE UPPER LOW WILL MOVE EAST OF THE
AREA TONIGHT. THIS COMBINED WITH STABILIZATION OF THE AIR MASS
WILL CAUSE THE THREAT OF SHOWERS TO END BY MIDNIGHT.

AN UPPER LEVEL RIDGE WILL SLOWLY BUILD INTO THE AREA FROM THE
SOUTHWEST ON THURSDAY. THIS WILL HERALD IN A CHANGE TO DRIER...
SUNNIER...AND WARMER CONDITIONS. LOOK FOR HIGH PRESSURE ALOFT TO
PREVAIL OVER THE REGION ON FRIDAY FOR ABOVE NORMAL TEMPERATURES.

.LONG TERM FROM THE PREV DISCUSSION...
THE UPPER RIDGE WILL STRENGTHEN THIS WEEKEND...BRINGING SUNNY
SKIES AND THE WARMEST WEATHER SO FAR THIS YEAR. HIGHS WILL BE IN
THE 80S OVER MUCH OF THE WESTERN WASHINGTON INTERIOR LOWLANDS
SATURDAY AND ESPECIALLY SUNDAY. WHILE THE DETAILS ARE HIGHLY
UNCERTAIN...THE RIDGE WILL PROBABLY START TO WEAKEN EARLY NEXT
WEEK WITH LOW LEVEL FLOW TURNING WEAKLY ONSHORE. THE WEATHER WILL
LIKELY REMAIN DRY...BUT WE SHOULD SEE AN INCREASE IN NIGHT AND
MORNING CLOUDS AND SOMEWHAT COOLER WEATHER. MCDONNAL

&&

.AVIATION...A BROAD UPPER TROUGH WILL BE OVER THE REGION TODAY AND
TONIGHT WITH LOW LEVEL ONSHORE FLOW. AIR MASS MOIST AND STABLE.

LOW CLOUDS ARE FAIRLY PREVALENT THIS MORNING. THESE SHOULD LIFT AND
BREAK UP WITH MOSTLY MID LEVEL CLOUDS IN THE AFTERNOON. A PUGET
SOUND CONVERGENCE ZONE OVER THE NORTH SOUND SHOULD BREAK UP TODAY.

KSEA...LOW CLOUDS THIS MORNING. MID CLOUDS THIS AFTERNOON. LIGHT
SOUTH WIND THIS MORNING BECOMING WESTERLY 4-8 KNOTS THIS AFTERNOON
AND NORTHERLY THIS EVENING. SCHNEIDER

&&

.MARINE...ONSHORE FLOW WILL PREVAIL THIS WEEK WITH HIGH PRESSURE
OFFSHORE AND LOWER PRESSURE INLAND. SMALL CRAFT ADVISORY WEST WINDS
ARE POSSIBLE IN THE STRAIT EACH DAY...MAINLY LATE AFTERNOON AND
EVENING HOURS. SMALL CRAFT ADVISORY NORTHWEST WINDS ARE ALSO LIKELY
OVER PARTS OF THE COASTAL WATERS LATER THIS WEEK. SCHNEIDER

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...NONE.
PZ...SMALL CRAFT ADVISORY IN EFFECT FROM 5 PM THIS AFTERNOON TIL 5
     AM PDT THURSDAY FOR THE CENTRAL AND EASTERN STRAIT OF JUAN DE
     FUCA.


&&

$$

WWW.WEATHER.GOV/SEATTLE

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




USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.