Area Forecast Discussion
Issued by NWS Seattle/Tacoma, WA

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FXUS66 KSEW 291634 CCA
AFDSEW

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
900 AM PDT SAT AUG 29 2015

.SYNOPSIS...A STRONG FRONTAL SYSTEM IS MOVING THROUGH THE REGION
TODAY. ADDITIONAL FRONTS WILL REACH THE REGION INTO EARLY NEXT
WEEK AS A LARGE UPPER TROUGH TAKES UP RESIDENCE IN THE NORTHEAST
PACIFIC. THE TROUGH WILL LIKELY LINGER THOUGH THE END OF NEXT WEEK.

&&

.SHORT TERM...SHOWERS AND WINDY WEATHER ARE ON TAP FOR WESTERN WA
TODAY AS A STRONG FRONTAL SYSTEM MOVES THROUGH WESTERN WA. SATELLITE
AND RADAR SHOW THAT THE MAIN FRONT MOVED THROUGH WRN WA AROUND DAYBREAK
AND THAT THE LOW PRESSURE CENTER AND SWIRLING RAIN BANDS ARE JUST OFF
THE COAST AT 9 AM. A COUPLE MORE FRONTAL WAVES SHOULD GIVE PERIODS OF
RAIN TO THE AREA THROUGH EARLY NEXT WEEK. THE HEAVIER RAIN WILL BE ON
THE NORTH COAST AND IN THE MOUNTAINS BUT THE LOWLANDS SHOULD GET SOME
RAIN AT TIMES IN THIS AUTUMNLIKE WEATHER PATTERN.

.LONG TERM...AN UPPER TROUGH WILL REMAIN OVER THE REGION FOR COOL
UNSETTLED CONDITIONS WITH SHOWERS AT TIMES. THERE WILL BE PARTLY
SUNNY PERIODS AS WELL...THE SOMEWHAT UNSTABLE AIR MASS WILL ALLOW
MORNING CLOUDS TO BUBBLE UP TO SCATTERED CU AND SHOWERS IN THE
AFTERNOON.

&&

.AVIATION...CEILINGS HAVE IMPROVED TO VFR LEVELS THIS MORNING BEHIND
THE FRONT THAT MOVED THROUGH THE INTERIOR THIS MORNING. RAIN
ASSOCIATED WITH THE FRONT OVER THE NORTH INTERIOR AS OF 16Z...SHOULD
MOVE QUICKLY NORTH OF THE BORDER OVER THE NEXT HOUR OR SO. SOUTHERLY
WINDS HAVE BEGUN TO INCREASE ALONG THE CENTRAL WA COAST ALREADY THIS
MORNING...AND ARE STARTING TO PICK UP OVER THE SOUTHWEST INTERIOR.
EXPECT SOUTHERLY WINDS TO INCREASING OVER THE INTERIOR FROM THE
SOUTH THROUGH THE REST OF THE MORNING WITH SUSTAINED WINDS 20 TO 30
KT POSSIBLE ESPECIALLY DURING THE LATE MORNING AND AFTERNOON HOURS.

THE UPPER LEVEL LOW WILL JUST CLIP THE OLYMPIC PENINSULA BY
MIDDAY AS IT EJECTS INTO BRITISH COLUMBIA...WITH SCATTERED SHOWERS
LINGERING OVER MUCH OF THE AREA. THE TRAILING COLD FRONT WILL ARRIVE
THIS EVENING WITH ANOTHER ROUND OF PRECIPITATION AND LOWER CEILINGS
WITH CONDITIONS TRENDING BACK DOWN TO MVFR LEVELS.


KSEA...EXPECT CONDITIONS TO REMAIN VFR WITH A BREAK IN THE RAIN
THROUGH THROUGH THE AFTERNOON. SOUTH WINDS WILL BECOME MORE
SOUTHERLY AND INCREASE OVER THE NEXT HOUR OR SO TO 15-25 AND
POSSIBLY 30 KNOTS. WINDS WILL EASE THIS EVENING WITH CEILINGS
LOWERING TO NEAR 3000 FEET WITH THE COLD FRONT TONIGHT.

&&

.MARINE...THE SURFACE LOW CONTINUES TO WORK THROUGH THE WA COASTAL
WATERS THIS MORNING WITH INCREASING SOUTH TO SOUTHWESTERLY
WINDS... BRINGING GALE FORCE WINDS TO ALL BUT THE WEST
ENTRANCE AND CENTRAL STRAIT. WINDS EASING TONIGHT WITH THE WEAKER
TRAILING COLD FRONT MOVING THROUGH THE WATERS. AN ADDITIONAL SET OF
WEAKER SYSTEMS WILL MOVE THROUGH THE WATERS MONDAY AND TUESDAY.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...

WA...HIGH WIND WARNINGS ARE IN EFFECT FOR MUCH OF THE LOWLANDS
 FROM 8 AM THIS MORNING TIL 6 PM PDT THIS EVENING.

PZ...GALE WARNING IN EFFECT THROUGH 6 PM THIS EVENING FOR THE
     COASTAL WATERS.

     GALE WARNINGS IN EFFECT THROUGH 6 PM SATURDAY EVENING FOR THE
     NORTHERN INLAND WATERS...EAST STRAIT...ADMIRALTY INLET...AND
     PUGET SOUND/HOOD CANAL.

     SMALL CRAFT ADVISORY IN EFFECT THROUGH 5 PM THIS AFTERNOON FOR
     THE WEST ENTRANCE.

&&

$$

WWW.WEATHER.GOV/SEATTLE

YOU CAN SEE AN ILLUSTRATED VERSION OF THIS DISCUSSION AT
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