Winter Storm Warning 9, NWS Seattle, WA

962 
WWUS46 KSEW 120100
WSWSEW

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
500 PM PST FRI NOV 11 2011

WAZ513-120200-
/O.CAN.KSEW.WW.Y.0030.000000T0000Z-111112T0500Z/
OLYMPICS-
500 PM PST FRI NOV 11 2011

...WINTER WEATHER ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS CANCELLED THE WINTER
WEATHER ADVISORY. 

THE LOCALLY HEAVY SNOW THAT OCCURRED EARLIER TAPERED OFF TO
SCATTERED SHOWERS THIS AFTERNOON. NO ADDITIONAL SIGNIFICANT
SNOWFALL IS EXPECTED THROUGH TONIGHT. HURRICANE RIDGE RECEIVED
ABOUT 9 INCHES OF NEW SNOW FROM THE STORM THAT IMPACTED THE AREA
TODAY.

$$

WAZ518-120500-
/O.CON.KSEW.WS.W.0009.000000T0000Z-111112T0500Z/
WEST SLOPES NORTHERN CASCADES AND PASSES-
500 PM PST FRI NOV 11 2011

...WINTER STORM WARNING FOR SNOW REMAINS IN EFFECT ABOVE 2500 FEET
UNTIL 9 PM PST THIS EVENING...

* AFFECTED LOCATION...MOUNT BAKER.

* ACCUMULATIONS...AN ADDITIONAL 2 TO 5 INCHES NEW SNOW IS LIKELY
  BY EARLY SATURDAY MORNING...WITH THE HEAVIEST SNOW OCCURRING IN
  SNOHOMISH COUNTY.

* SNOW LEVEL...WILL FALL TO NEAR 1500 FEET OVERNIGHT.

* TIMING...THE SNOW WILL PERSIST OVERNIGHT BUT WILL BECOME LIGHT
  BY LATE TONIGHT ACROSS THE ENTIRE AREA.

* IMPACTS...ANTICIPATE HAZARDOUS WINTER DRIVING CONDITIONS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING MEANS SEVERE WINTER WEATHER IS OCCURRING
OR IMMINENT. THOSE PLANNING TRAVEL IN THE WARNED AREA SHOULD BE
PREPARED FOR HAZARDOUS WINTER DRIVING CONDITIONS AND PLAN
ACCORDINGLY.

&&

$$

WAZ519-120500-
/O.CON.KSEW.WW.Y.0030.000000T0000Z-111112T0500Z/
WEST SLOPES CENTRAL CASCADES AND PASSES-
500 PM PST FRI NOV 11 2011

...WINTER WEATHER ADVISORY FOR SNOW REMAINS IN EFFECT ABOVE 2500
FEET UNTIL 9 PM PST THIS EVENING...

* SOME AFFECTED LOCATIONS...STEVENS PASS...SNOQUALMIE PASS...AND 
  PARADISE. 

* ACCUMULATIONS...2 TO 5 INCHES OF NEW SNOW IS LIKELY BY EARLY
  SATURDAY...BRINGING THE STORM TOTAL TO 6 TO 11 INCHES.

* SNOW LEVEL...FALLING TO 1500 TO 2000 FEET OVERNIGHT.

* TIMING...THE SNOW WILL PERSIST OVERNIGHT BUT WILL BECOME LIGHT
  BY MIDNIGHT ACROSS THE ENTIRE AREA.

* IMPACTS...TRAVEL WILL BE DIFFICULT AT TIMES IN THE PASSES. THOSE
  PLANNING TRAVEL THROUGH SNOQUALMIE AND STEVENS PASS SHOULD BE
  PREPARED FOR WINTRY DRIVING CONDITIONS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW WILL CAUSE
TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED
VISIBILITIES...AND USE CAUTION WHILE DRIVING.

&&

$$

WWW.WEATHER.GOV

943 
WWUS46 KSEW 120450
WSWSEW

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
850 PM PST FRI NOV 11 2011

WAZ518-121200-
/O.CAN.KSEW.WS.W.0009.000000T0000Z-111112T0500Z/
/O.EXB.KSEW.WW.Y.0030.000000T0000Z-111112T1200Z/
WEST SLOPES NORTHERN CASCADES AND PASSES-
850 PM PST FRI NOV 11 2011

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 4 AM PST SATURDAY...
...WINTER STORM WARNING IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A WINTER
WEATHER ADVISORY FOR SNOW...WHICH IS IN EFFECT UNTIL 4 AM PST
SATURDAY. THE WINTER STORM WARNING HAS BEEN CANCELLED.

* ADDITIONAL ACCUMULATIONS...2 TO 4 INCHES OF NEW SNOW IS LIKELY
  BY EARLY SATURDAY...BRINGING THE STORM TOTAL TO 4 TO 12 INCHES.

* SNOW LEVEL...1500 FEET.

* TIMING...OCCASIONAL SNOW SHOWERS OVERNIGHT.

* IMPACTS...TRAVEL WILL BE DIFFICULT AT TIMES IN THE PASSES. THOSE
  PLANNING TRAVEL SHOULD BE PREPARED FOR WINTRY DRIVING
  CONDITIONS.

A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW WILL CAUSE
TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED
VISIBILITIES...AND USE CAUTION WHILE DRIVING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...SLEET...OR
FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE
DRIVING.

&&

$$

WAZ519-121200-
/O.EXT.KSEW.WW.Y.0030.000000T0000Z-111112T1200Z/
WEST SLOPES CENTRAL CASCADES AND PASSES-
850 PM PST FRI NOV 11 2011

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 4 AM PST SATURDAY...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS EXTENDED THE WINTER
WEATHER ADVISORY FOR SNOW AND IT IS IN EFFECT UNTIL 4 AM PST
SATURDAY.

* ADDITIONAL ACCUMULATIONS...2 TO 4 INCHES OF NEW SNOW IS LIKELY
  BY EARLY SATURDAY...BRINGING THE STORM TOTAL TO 4 TO 12 INCHES.

* SNOW LEVEL...1500 FEET.

* TIMING...OCCASIONAL SNOW SHOWERS OVERNIGHT.

* IMPACTS...TRAVEL WILL BE DIFFICULT AT TIMES IN THE PASSES. THOSE
  PLANNING TRAVEL SHOULD BE PREPARED FOR WINTRY DRIVING
  CONDITIONS.

A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW WILL CAUSE
TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED
VISIBILITIES...AND USE CAUTION WHILE DRIVING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...SLEET...OR
FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE
DRIVING.

&&

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
946 AM PST FRI NOV 11 2011

.SYNOPSIS...A STRONG COLD FRONT WILL SWEEP ACROSS THE AREA BY EARLY
AFTERNOON. EXPECT WET AND BLUSTERY CONDITIONS WITH THIS SYSTEM. LOOK
FOR ANOTHER SYSTEM TO IMPACT THE REGION ON SATURDAY. THE WEATHER
WILL BE MORE SETTLED ON SUNDAY.

&&

.SHORT TERM...
PRECIP...LOCALLY HEAVY...HAS OVERSPREAD ABOUT THE NW THIRD OF THE
CWA AT THIS TIME. THE MODELS INDICATED THAT PARTS OF THE PUGET SOUND
REGION WILL STAY IN THE RAIN SHADOW TIL THE CDFNT SWEEPS THROUGH OR
ABOUT NOON. THE CDFNT...BASED ON SATELLITE IMAGERY AND SFC
ANALYSES...APPEARED TO BE OVER THE FAR N COAST AT THIS TIME.

THE UPPER LOW CONTINUED TO MOVE RAPIDLY S ALONG THE BRITISH COLUMBIA
COAST. THIS SYSTEM WAS QUITE STRONG AS EVIDENCED BY THE DARKENING
SIGNATURE ON THE WATER VAPOR SATELLITE IMAGERY AND WAS BEING AIDED
BY A 165-KT JET. THE MAIN IMPACTS THIS SYSTEM WILL HAVE ON OUR
WEATHER WILL BE GUSTY WINDS AND LOCALLY HEAVY SNOW IN THE MOUNTAINS.
IN SOME PLACES...THE PRECIP RATES HAVE BEEN ABOUT A TENTH TO TWO
TENTHS OF AN INCH PER HOUR...WITH LOCAL AMOUNTS OF UP TO FOUR TENTHS
ON THE OLYMPIC RANGE. THE LATEST NAM AND GFS WERE INDICATING THAT
THE N CASCADES COULD RECEIVE SLIGHTLY MORE THAN A FOOT OF
SNOW...WHICH IS PLAUSIBLE CONSIDERING THAT OROGRAPHIC EFFECTS WILL
ENHANCE SNOWFALL RATES EVEN BEHIND THE FRONT. THEREFORE STRONGLY
CONSIDERING UPGRADING THE ADVISORY TO WARNING OVER THIS AREA.

CONCERNING WINDS...THE MODELS CONTINUED TO INDICATE THE STRONGEST
WINDS WILL OCCUR OVER THE ADMIRALTY INLET AREA...WHERE A HIGH WIND
WARNING IS CURRENTLY IN EFFECT.

LOOK FOR THE PRECIP TO TAPER OFF OR...IN THE CASE OF THE CASCADES...
BECOME LIGHTER TONIGHT IN THE WAKE OF THE UPPER LOW AND ASSOCIATED
CDFNT. THE UPPER LOW IS EXPECTED TO BE OVER NE WA BY LATE THIS
EVENING AND...OF COURSE...THE CDFNT WILL BE WELL E OF THE CWA BY
LATE THIS AFTERNOON. WINDS SHOULD GRADUALLY DIE DOWN THIS EVENING.

ANOTHER SYSTEM OUT OF THE GULF OF AK WILL RAPIDLY APPROACH THE PAC
NW ON SATURDAY...BRINGING MORE RAIN AND MOUNTAIN SNOW TO THE CWA BY
SATURDAY AFTERNOON. THIS SYSTEM DID  NOT APPEAR AS STRONG AS THE
PRESENT ONE AND WILL TAKE A MORE SRN TRAJECTORY. THUS THE CENTRAL
CASCADES WILL PROBABLY RECEIVE THE HEAVIEST PRECIP WITH THIS SYSTEM.

EXPECT SOMEWHAT MORE SETTLED CONDITIONS ON SUNDAY...ALTHOUGH PRECIP
WILL CONTINUE IN THE CASCADES AND OLYMPICS DUE TO CONTINUED UPSLOPE
EFFECTS.

.LONG TERM FROM THE PREV DISCUSSION...
THERE IS LITTLE CHANGE IN THE WEATHER PATTERN ACROSS THE PAC NW
THROUGH MID WEEK. THE POLAR JET WILL RIDE ACROSS WESTERN WA
MAINTAINING AN ACTIVE WEATHER PATTERN. 500 MB HEIGHTS WILL REMAIN IN
THE 540S WITH SEVERAL UPPER LEVEL DISTURBANCES CLIPPING THROUGH THE
REGION. EXPECT A CONTINUATION OF COOL AND SHOWERY WEATHER WITH SNOW
LEVELS HOVERING BETWEEN 2000-3000FT. THE JET MAY DIP FARTHER SOUTH
AND INTO CA LATE IN THE WEEK AS A DEEP UPPER LEVEL LOW DESCENDS FROM
ALASKA. WILL MAINTAIN A PERSISTENCE FORECAST THAT CALLS FOR BELOW
NORMAL TEMPS AND ABOVE NORMAL PRECIPITATION. 33

&&

.HYDROLOGY...FLOODING IS UNLIKELY OVER THE NEXT 7 DAYS.

&&

.AVIATION...A STRONG COLD FRONT WILL MOVE ONSHORE TODAY. AN
ASSOCIATED UPPER TROUGH WILL MOVE OVER THE AREA LATER TODAY WITH
SOUTHWEST FLOW ALOFT BECOMING NORTHWEST LATE TODAY. MID AND LOW
LEVEL MOISTURE WILL INCREASE ACROSS THE AREA TODAY AS THE FRONT
MOVES ONSHORE AND RAIN SPREADS INLAND. AIR MASS STABLE...BECOMING
UNSTABLE BEHIND THE FRONT.

KSEA...SOUTH WIND 10-20 KNOTS THIS MORNING WILL BECOMING SOUTHWEST
15 TO 25 WITH GUSTS PERHAPS TO 35 KNOTS THIS AFTERNOON BEFORE EASING
IN THE EVENING. THERE IS A CHANCE WINDS COULD SWITCH TO NORTHWEST
FOR A FEW HOURS IN THE EVENING WITH A CONVERGENCE ZONE BUT THIS IS
RATHER UNCERTAIN AT THIS TIME. SCHNEIDER

&&

.MARINE...A STRONG FRONT WILL BRING GALES TO MOST WATERS LATER
TODAY. THERE WILL BE STRONG WEST WINDS THROUGH THE STRAIT COMBINED
WITH STRONG SOUTHERLIES THROUGH PUGET SOUND AND OVER THE NORTHERN
INLAND WATERS. WINDS WILL EASE ALL WATERS LATER TONIGHT.

THE STRONG WINDS WILL ALSO PRODUCE LARGE WAVES DOWN THE STRAIT THIS
AFTERNOON. THIS WILL COINCIDE WITH A MODERATELY HIGH TIDE TO
PRODUCE THE POSSIBILITY OF MINOR COASTAL FLOODING FOR THE ADMIRALTY
INLET AREA INCLUDING THE WEST SIDE OF WHIDBEY ISLAND.

AN ACTIVE PATTERN WILL CONTINUE THIS WEEKEND AND EARLY NEXT WEEK...
WITH ADDITIONAL FRONTAL SYSTEMS PROBABLY MOVING THROUGH AROUND
SATURDAY AND MONDAY. THESE SYSTEMS WILL PROBABLY PRODUCE WINDS IN
THE HIGH END SMALL CRAFT ADVISORY OR LOW END GALE RANGE. SCHNEIDER

&&

.SEW WATCHES/WARNINGS/ADVISORIES...
WA...HIGH WIND WARNING UNTIL 7 PM PST THIS EVENING FOR THE
     ADMIRALTY INLET AREA.

     WIND ADVISORIES ARE IN EFFECT FOR THE PUGET SOUND REGION...
     SOUTHWEST INTERIOR...EASTERN STRAIT OF JUAN DE FUCA...SAN
     JUAN COUNTY...AND WESTERN SKAGIT AND WHATCOM COUNTIES.

     WINTER WEATHER ADVISORY ABOVE 2500 FT UNTIL 9 PM PST
     TONIGHT FOR THE OLYMPICS AND CASCADES.

     COASTAL FLOOD ADVISORY FROM 2 PM THIS AFTERNOON TO 6 PM PST
     THIS EVENING FOR THE ADMIRALTY INLET AREA.

PZ...GALE WARNINGS ARE IN EFFECT FOR THE INLAND WATERS.

     SMALL CRAFT ADVISORY UNTIL 6 AM PST SATURDAY FOR THE COASTAL
     AND NEAR SHORE WATERS.

     SMALL CRAFT ADVISORY FOR ROUGH BAR UNTIL 6 AM PST SATURDAY
     FOR THE GRAYS HARBOR BAR.

&&

WWW.WEATHER.GOV/SEATTLE