High Wind Warning 16, NWS Seattle, WA

360 
WWUS76 KSEW 172339
NPWSEW

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
339 PM PST FRI DEC 17 2010

...LOCALLY DAMAGING EAST WINDS ARE LIKELY THIS EVENING THROUGH
SATURDAY MORNING OVER THE EAST PUGET SOUND LOWLANDS AND NEAR THE
WEST ENTRANCE TO THE STRAIT OF JUAN DE FUCA...

.EASTERLY PRESSURE GRADIENTS WILL INCREASE TONIGHT AND PEAK
AROUND DAYBREAK SATURDAY AS A DEEPENING FRONTAL SYSTEM MOVES INTO
THE OFFSHORE WATERS. THIS PATTERN PRODUCES LOCALLY HIGH WINDS FOR
THE EAST PUGET SOUND LOWLANDS AND AT WEST ENTRANCE TO THE STRAIT
OF JUAN DE FUCA AROUND NEAH BAY.

WAZ505-516-181230-
/O.CON.KSEW.HW.W.0016.101218T0200Z-101218T2000Z/
EAST PUGET SOUND LOWLANDS-NORTH COAST-
339 PM PST FRI DEC 17 2010

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL NOON PST SATURDAY
FOR THE EAST PUGET SOUND LOWLANDS AND NORTH COAST...

A HIGH WIND WARNING FOR THE EAST PUGET SOUND LOWLANDS AND NORTH
COAST REMAINS IN EFFECT UNTIL NOON PST SATURDAY.

* SOME AFFECTED LOCATIONS FOR THE EAST PUGET SOUND LOWLANDS 
  INCLUDE NORTH BEND...BLACK DIAMOND...COVINGTON...AND ENUMCLAW. 
  SOME AFFECTED LOCATIONS FOR THE NORTH COAST ARE THE AREA AT 
  THE WEST ENTRANCE TO THE STRAIT OF JUAN DE FUCA INCLUDING NEAH 
  BAY. 

* WINDS...LOCAL EAST WINDS OF 30 TO 40 MPH WITH GUSTS TO 65 MPH 
  ARE LIKELY.

* TIMING...TONIGHT AND SATURDAY MORNING.

* IMPACTS...STRONG EAST WINDS COULD DOWN TREES AND POWER LINES
  AND DAMAGE SOME STRUCTURES. WET SOIL FROM RECENT HEAVY 
  RAINFALL COULD WORSEN THESE PROBLEMS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS THAT A HAZARDOUS WIND EVENT IS IMMINENT
OR OCCURRING. HIGH WINDS CAN TOPPLE TREES...DOWN POWER LINES...
AND DESTROY PROPERTY.

&&

$$

MCDONNAL
WWW.WEATHER.GOV/SEATTLE

516 
WWUS76 KSEW 181155
NPWSEW

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
355 AM PST SAT DEC 18 2010

.A STRONG FRONT WILL SWEEP NORTH THROUGH WESTERN WASHINGTON THIS
MORNING PRODUCING STRONG EASTERLY FLOW ACROSS THE CASCADES AND
THROUGH THE STRAIT OF JUAN DE FUCA. THIS WEATHER PATTERN PRODUCES
STRONG EAST WINDS IN THE EAST PUGET SOUND LOWLANDS AND THE NORTH
COAST NEAR THE WEST ENTRANCE TO THE STRAIT OF JUAN DE FUCA.

WAZ505-516-182000-
/O.CON.KSEW.HW.W.0016.000000T0000Z-101218T2000Z/
EAST PUGET SOUND LOWLANDS-NORTH COAST-
355 AM PST SAT DEC 18 2010

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL NOON PST TODAY FOR
THE EAST PUGET SOUND LOWLANDS AND NORTH COAST...

A HIGH WIND WARNING FOR THE EAST PUGET SOUND LOWLANDS AND NORTH
COAST REMAINS IN EFFECT UNTIL NOON PST TODAY.

* SOME AFFECTED LOCATIONS FOR THE EAST PUGET SOUND LOWLANDS
  INCLUDE NORTH BEND...BLACK DIAMOND...COVINGTON...MAPLE VALLEY
  AND ENUMCLAW. SOME AFFECTED LOCATIONS FOR THE NORTH COAST
  INCLUDE NEAH BAY AND AREAS NEAR THE WEST ENTRANCE TO THE STRAIT
  OF JUAN DE FUCA.

* WINDS...LOCAL EAST WINDS OF 30 TO 40 MPH WITH GUSTS TO 65 MPH 
  ARE LIKELY.

* TIMING...STRONG EAST WIND WILL CONTINUE THIS MORNING THEN EASE
  THIS AFTERNOON.

* IMPACTS...STRONG EAST WINDS COULD DOWN TREES AND POWER LINES 
  AND DAMAGE SOME STRUCTURES. WET SOIL FROM RECENT HEAVY 
  RAINFALL COULD WORSEN THESE PROBLEMS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS THAT A HAZARDOUS WIND EVENT IS IMMINENT
OR OCCURRING. HIGH WINDS CAN TOPPLE TREES...DOWN POWER LINES...
AND DESTROY PROPERTY.

&&

$$

33

WWW.WEATHER.GOV/SEATTLE

375 
WWUS76 KSEW 181218
NPWSEW

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
418 AM PST SAT DEC 18 2010

.A STRONG FRONT WILL SWEEP NORTH THROUGH WESTERN WASHINGTON THIS
MORNING PRODUCING STRONG EASTERLY FLOW ACROSS THE CASCADES AND
THROUGH THE STRAIT OF JUAN DE FUCA. THIS WEATHER PATTERN PRODUCES
STRONG EAST WINDS IN THE EAST PUGET SOUND LOWLANDS AND THE NORTH
COAST NEAR THE WEST ENTRANCE TO THE STRAIT OF JUAN DE FUCA.

WAZ505-516-182000-
/O.CON.KSEW.HW.W.0016.000000T0000Z-101218T2000Z/
EAST PUGET SOUND LOWLANDS-NORTH COAST-
418 AM PST SAT DEC 18 2010

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL NOON PST TODAY FOR
THE EAST PUGET SOUND LOWLANDS AND NORTH COAST...

A HIGH WIND WARNING FOR THE EAST PUGET SOUND LOWLANDS AND NORTH
COAST REMAINS IN EFFECT UNTIL NOON PST TODAY.

* SOME AFFECTED LOCATIONS FOR THE EAST PUGET SOUND LOWLANDS 
  INCLUDE NORTH BEND...BLACK DIAMOND...COVINGTON...MAPLE VALLEY 
  AND ENUMCLAW. SOME AFFECTED LOCATIONS FOR THE NORTH COAST 
  INCLUDE NEAH BAY AND AREAS NEAR THE WEST ENTRANCE TO THE 
  STRAIT OF JUAN DE FUCA. 

* WINDS...LOCAL EAST WINDS OF 30 TO 40 MPH WITH GUSTS TO 65 MPH 
  ARE LIKELY.

* TIMING...STRONG EAST WIND WILL CONTINUE THIS MORNING THEN 
  EASE THIS AFTERNOON. 

* IMPACTS...STRONG EAST WINDS COULD DOWN TREES AND POWER LINES 
  AND DAMAGE SOME STRUCTURES. WET SOIL FROM RECENT HEAVY 
  RAINFALL COULD WORSEN THESE PROBLEMS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A HIGH WIND WARNING MEANS THAT A HAZARDOUS WIND EVENT IS IMMINENT
OR OCCURRING. HIGH WINDS CAN TOPPLE TREES...DOWN POWER LINES...
AND DESTROY PROPERTY.

&&

$$

WAZ508-182000-
/O.NEW.KSEW.WI.Y.0026.101218T1218Z-101218T2000Z/
SEATTLE/BREMERTON AREA-
418 AM PST SAT DEC 18 2010

...WIND ADVISORY IN EFFECT UNTIL NOON PST TODAY FOR THE SEATTLE
METRO...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A WIND
ADVISORY FOR THE SEATTLE METRO AREA UNTIL NOON PST TODAY.

* SOME AFFECTED LOCATIONS...INCLUDE SEATTLE AND BREMERTON.

* WINDS...LOCALLY SUSTAINED EAST WINDS OF 25 TO 35 MPH WITH GUSTS
  TO 50 MPH.

* TIMING...STRONG EAST WINDS WILL CONTINUE THROUGH THIS MORNING
  THEN EASE THIS AFTERNOON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WIND ADVISORY IS ISSUED WHEN SUSTAINED WINDS OF 30 TO 39 MPH OR
GUSTS OF 45 TO 57 MPH ARE LIKELY. WINDS THIS STRONG CAN SNAP
SMALL TREE BRANCHES...TOPPLE SMALL OR SHALLOW-ROOTED TREES...AND
CAUSE LOCAL POWER OUTAGES.

&&

$$

33
WWW.WEATHER.GOV/SEATTLE

350 
WWUS76 KSEW 181753
NPWSEW

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
953 AM PST SAT DEC 18 2010

...CONDITIONS THAT PRODUCED HIGH WINDS OVER THE EAST PUGET SOUND
LOWLANDS AND AT THE NORTH COAST NEAR THE WEST ENTRANCE TO THE
STRAIT OF JUAN DE FUCA HAVE EASED...

.CONDITIONS THAT PRODUCED LOCALLY DAMAGING WINDS OVER THE EAST
PUGET SOUND LOWLANDS AND AT THE NORTH COAST NEAR THE WEST ENTRANCE
TO THE STRAIT OF JUAN DE FUCA EARLIER THIS MORNING HAVE EASED. THE
WARNING HAS ENDED.

WAZ505-516-181900-
/O.CAN.KSEW.HW.W.0016.000000T0000Z-101218T2000Z/
EAST PUGET SOUND LOWLANDS-NORTH COAST-
953 AM PST SAT DEC 18 2010

...HIGH WIND WARNING HAS ENDED FOR THE EAST PUGET SOUND LOWLANDS
AND NORTH COAST...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ENDED THE HIGH WIND
WARNING FOR THE EAST PUGET SOUND LOWLANDS AND NORTH COAST.

LOCALLY DAMAGING WINDS OCCURRED OVERNIGHT AND EARLIER THIS
MORNING OVER THE EAST PUGET SOUND LOWLANDS AND ALONG THE NORTH
COAST NEAR THE WEST ENTRANCE TO THE STRAIT OF JUAN DE FUCA...AS A
STORM DEEPENED OVER THE OFFSHORE WATERS AND A FRONT MOVED NORTH
ACROSS THE REGION.

CONDITIONS PRODUCING THE HIGH WINDS HAVE EASED...AND THE WARNING
HAS ENDED.

BREEZY CONDITIONS AND OCCASIONAL GUSTY WINDS WILL CONTINUE IN
THESE REGIONS FOR THE NEXT FEW HOURS...BUT DAMAGING WINDS ARE NO
LONGER EXPECTED.

$$

WAZ508-181900-
/O.CAN.KSEW.WI.Y.0026.000000T0000Z-101218T2000Z/
SEATTLE/BREMERTON AREA-
953 AM PST SAT DEC 18 2010

...WIND ADVISORY HAS ENDED FOR THE SEATTLE BREMERTON AREA...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ENDED THE WIND
ADVISORY FOR THE SEATTLE BREMERTON AREA.

CONDITIONS THAT PRODUCED LOCALLY WINDY CONDITIONS IN THE SEATTLE
AREA OVERNIGHT AND EARLIER THIS MORNING HAVE EASED. THE WIND
ADVISORY IS NO LONGER IN EFFECT. LOCAL GUSTS TO 30 MPH ARE LIKELY
FOR THE NEXT FEW HOURS...BUT WINDS WILL NOT BE AS STRONG AS
EARLIER THIS MORNING. 

$$

MCDONNAL
WWW.WEATHER.GOV/SEATTLE

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
930 AM PST FRI DEC 17 2010

.SYNOPSIS...TODAY WILL BE A MAINLY DRY DAY FOR WESTERN WASHINGTON. A
DEEPENING FRONTAL SYSTEM OVER THE COASTAL WATERS WILL CAUSE SOME
HIGH WIND ALONG THE EAST PUGET SOUND LOWLANDS AND WEST ENTRANCE TO
THE STRAIT OF JUAN DE FUCA TONIGHT AND SATURDAY MORNING. SNOW IS
POSSIBLE AROUND HOOD CANAL SATURDAY...WITH RAIN ACROSS THE REST OF
THE LOWLANDS. A COLD UPPER TROUGH OFFSHORE WILL BRING PERIODS OF
SHOWERS TO THE AREA SATURDAY NIGHT INTO THE MIDDLE OF NEXT WEEK.

&&

.SHORT TERM...WEAK DIFFLUENT SOUTHWEST FLOW ALOFT CONTINUES OVER
WESTERN WASHINGTON THIS MORNING...WITH A STRONG WESTERLY JET ALONG
37N EXTENDING INTO CALIFORNIA AND A DEEP UPPER LOW WELL OFFSHORE
NEAR 47N/145W. A CONVECTIVE BAND ASSOCIATED WITH WEAK SHORTWAVE
FEATURE IS MOVING NORTHEAST OVER THE COASTAL WATERS OF THE PACIFIC
NORTHWEST...BUT FOR THE TIME BEING THE FORECAST AREA IS DRY. THERE
ARE AREAS OF FOG MAINLY IN THE SOUTH PUGET SOUND REGION AND
SOUTHWEST INTERIOR...WHICH IS ALSO WHERE THE TEMPERATURE DROPPED
BELOW FREEZING THIS MORNING.

THE WEAK CONVECTIVE SYSTEM OFFSHORE COULD BRING SOME SHOWERS TO THE
COASTAL ZONE AND OLYMPIC MOUNTAINS TODAY...AS WELL AS THE COASTAL
WATERS SO I WILL ISSUE A MINOR UPDATE THIS MORNING TO ADDRESS THAT.

THE INTERACTION OF THE ZONAL JET MOVING THROUGH THE BASE OF THE
UPPER LOW WILL CAUSE A FRONTAL SYSTEM TO FORM AND DEEPEN RAPIDLY
TODAY AND TONIGHT -- PERHAPS MORE THAN 24 MB IN 24 HOURS -- AS IT
CURLS FROM THE WATERS WELL OFFSHORE OF CALIFORNIA NORTHEAST ALONG
130W OFF THE PACIFIC NORTHWEST. THIS SYSTEM WILL HAVE A COUPLE MAJOR
IMPACTS ON OUR WEATHER.

FIRST IT WILL CAUSE THE EASTERLY GRADIENT ACROSS THE REGION TO
STRENGTHEN CONSIDERABLY. THIS COULD PRODUCE LOCALIZED HIGH WINDS --
BY DEFINITION SUSTAINED OF 40 MPH OR GUSTS TO 60 MPH -- TONIGHT
THROUGH SATURDAY MORNING OVER THE EAST PUGET SOUND LOWLANDS AND AT
THE WEST ENTRANCE TO THE STRAIT OF JUAN DE FUCA. THE FORECAST
PRESSURE GRADIENT IS ENOUGH TO JUSTIFY THIS CONCERN...AND THERE IS
THE POTENTIAL FOR MOUNTAIN WAVE AS WELL OVER THE EAST PUGET SOUND
LOWLANDS. WE ISSUED A HIGH WIND WATCH EARLY THURSDAY MORNING TO
ADDRESS THIS THREAT...AND WE WILL UPGRADE THE WATCH TO A WARNING
THIS MORNING.

THE FRONTAL SYSTEM WILL ALSO SPREAD PRECIPITATION NORTHWARD ACROSS
THE FORECAST AREA SATURDAY. GENERALLY SPEAKING THE SNOW LEVEL WILL
BE IN THE 500 TO 1500 FT RANGE...BUT AN AREA OF CONCERN FOR LOW
ELEVATION SNOW IS THE AREA ALONG HOOD CANAL. A WEAK NORTHERLY
COMPONENT TO THE SURFACE PRESSURE GRADIENT WILL HELP TRAP COLD AIR
ALONG THE EAST SLOPES OF THE OLYMPICS IN THIS REGION...AND MODELS
INDICATE THE AIR MASS THERE WILL BE COLD ENOUGH FOR SNOW OR A MIX OF
RAIN AND SNOW. THIS IS ALREADY ADDRESSED IN OUR FORECAST.

THE STEADY WIDESPREAD PRECIPITATION WITH THE FRONT WILL END SATURDAY
NIGHT...BUT SHOWERY PRECIPITATION WILL CONTINUE THROUGH SUNDAY AS
THE UPPER LOW MOVES INTO THE OREGON OFFSHORE WATERS AND MAINTAINS
MOIST SOUTHERLY FLOW AND A MARGINALLY UNSTABLE AIR MASS OVER THE
AREA.  MCDONNAL

.LONG TERM...HERE IS THE LONG TERM SECTION FROM THE EARLY MORNING
ISSUANCE OF THE FORECAST DISCUSSION -- ANOTHER RATHER STRONG WAVE
PASSES BY TO THE WEST OF THE AREA MON AFTERNOON. THE 06Z GFS SHOWS
THIS WAVE GIVING ANOTHER POTENTIAL FOR LOCALLY STRONG EASTERLY WINDS
IN THE CASCADE FOOTHILLS...AND POSSIBLY ANOTHER SHOT OF SNOW FOR THE
AREA ALONG HOOD CANAL. THE ECMWF IS WEAKER BUT SHOWS A SIMILAR
PATTERN. THE OVERALL PATTERN OF A DEEP TROUGH AROUND 135W AND A
RIDGE OVER THE ROCKIES WITH DISTURBANCES ROTATING NORTHWARD ALONG
THE COAST LASTS THROUGH THE UPCOMING WEEK. ALBRECHT

&&

.HYDROLOGY...FLOODING IS UNLIKELY ACROSS WESTERN WASHINGTON FOR THE
NEXT 10 DAYS...WITH GENERALLY LOW SNOW LEVELS AND HYDROLOGICALLY
INSIGNIFICANT PRECIPITATION. THERE ARE NO FLOODING CONCERNS FOR THE
GREEN RIVER.

&&

.AVIATION...AN UPPER LOW WILL BE OVER THE EASTERN PACIFIC WITH
SOUTHERLY FLOW ALOFT OVER WESTERN WASHINGTON TODAY AND TONIGHT. AT
THE SURFACE...A 990MB LOW WILL DEEPEN TO AROUND 980 MB AND MOVE INTO
THE OFFSHORE WATERS TONIGHT WITH INCREASING LOW LEVEL OFFSHORE FLOW.
AREAS OF MID LEVEL MOISTURE AT THE COAST. PATCHY LOW LEVEL MOISTURE
SOUTHWEST INTERIOR. OTHERWISE AIR DRY AND STABLE.

INCREASING LOW LEVEL OFFSHORE GRADIENTS SHOULD KEEP SKIES VFR TODAY
AND TONIGHT WITH THE EXCEPTION OF SOME STUBBORN FOG PATCHES IN THE
SOUTHWEST INTERIOR. MID AND LOW LEVEL MOISTURE WILL BE INCREASING ON
SATURDAY FROM THE SOUTH AS AN UPPER SHORT ROTATING AROUND THE
OFFSHORE LOW MOVES INTO WESTERN WASHINGTON.

KSEA...EAST/SOUTHEAST WIND 10-15 KT...GUSTS 20 TO 30 KT LIKELY BY
LATE TONIGHT. SCHNEIDER

&&

.MARINE...A 990 MB SURFACE LOW WILL MOVE NORTH INTO THE OFFSHORE
WATERS TONIGHT. THE LOW WILL THEN DO A COUNTER-CLOCKWISE CIRCULAR
LOOP BETWEEN 130W AND 140W OVER THE NEXT FEW DAYS...RE-ENTERING THE
COASTAL WATERS FROM THE SOUTHWEST SUNDAY NIGHT OR MONDAY. THE
RESULT WILL BE OFFSHORE FLOW FOR THE COASTAL WATERS FOR MOST OF THE
NEXT FIVE DAYS. THE STRONGEST OFFSHORE FLOW LOOKS TO BE TONIGHT AND
SATURDAY MORNING AS THE LOW MAKES ITS CLOSEST PASS IN THE OFFSHORE
WATERS. GALES ARE UP FOR THE COASTAL WATERS AND WESTERN HALF OF THE
STRAIT FOR THIS. SCHNEIDER

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...HIGH WIND WARNING FOR THE EAST PUGET SOUND LOWLANDS AND EXTREME
       NORTH COAST ZONE TONIGHT THROUGH MIDDAY SATURDAY.

PZ...SMALL CRAFT ADVISORY ALL WATERS UNTIL 6 PM THIS EVENING EXCEPT
       ADMIRALTY INLET AND PUGET SOUND HOOD CANAL.
    .GALE WARNING COAST AND WEST ENTRANCE FROM 6 PM THIS EVENING
       THROUGH SATURDAY.

WWW.WEATHER.GOV/SEATTLE