Winter Storm Warning 1, NWS Seattle, WA

040 
WWUS46 KSEW 130458
WSWSEW

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
858 PM PST TUE JAN 12 2016

WAZ567-568-131300-
/O.UPG.KSEW.WW.Y.0002.000000T0000Z-160113T1800Z/
/O.EXA.KSEW.WS.W.0001.000000T0000Z-160113T1800Z/
CASCADES OF WHATCOM AND SKAGIT COUNTIES-
CASCADES OF SNOHOMISH AND KING COUNTIES-
858 PM PST TUE JAN 12 2016

...WINTER STORM WARNING IN EFFECT UNTIL 10 AM PST WEDNESDAY...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A WINTER STORM
WARNING FOR SNOW...WHICH IS IN EFFECT UNTIL 10 AM PST WEDNESDAY.
THE WINTER WEATHER ADVISORY IS NO LONGER IN EFFECT.

* ACCUMULATIONS...10 TO 18 INCHES ARE LIKELY.

* TIMING...HEAVY SNOW WILL CONTINUE TONIGHT THROUGH WEDNESDAY
  MORNING...THEN TRANSITION TO SNOW SHOWERS WEDNESDAY AFTERNOON. 

* SNOW LEVELS...4000 FEET...EXCEPT NEAR THE SURFACE IN THE PASSES
  THROUGH TONIGHT.

* MAIN IMPACTS...SNOW COVERED OR SLIPPERY ROADS AS WELL AS REDUCED 
  VISIBILITIES AT TIMES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER
CONDITIONS ARE EXPECTED OR OCCURRING.  SIGNIFICANT AMOUNTS OF SNOW
ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN
EMERGENCY. IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT...FOOD...
AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY.

&&

$$

WAZ569-131300-
/O.CON.KSEW.WS.W.0001.000000T0000Z-160113T1800Z/
CASCADES OF PIERCE AND LEWIS COUNTIES-
858 PM PST TUE JAN 12 2016

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST
WEDNESDAY...

* ACCUMULATIONS...10 TO 18 INCHES ARE LIKELY. SNOWFALL RATES OF UP 
  TO ONE INCH PER HOUR ARE POSSIBLE AT TIMES TONIGHT. 

* TIMING...HEAVY SNOW WILL CONTINUE TONIGHT THROUGH WEDNESDAY
  MORNING...THEN TRANSITION TO SNOW SHOWERS WEDNESDAY AFTERNOON.

* SNOW LEVELS...AROUND 4000 FEET.

* MAIN IMPACTS...SNOW COVERED OR SLIPPERY ROADS AS WELL AS REDUCED 
  VISIBILITIES AT TIMES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER
CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF SNOW
ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN
EMERGENCY. IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT...FOOD...
AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY.

&&

$$

768 
WWUS46 KSEW 131127
WSWSEW

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
327 AM PST WED JAN 13 2016

WAZ567>569-131800-
/O.CON.KSEW.WS.W.0001.000000T0000Z-160113T1800Z/
CASCADES OF WHATCOM AND SKAGIT COUNTIES-
CASCADES OF SNOHOMISH AND KING COUNTIES-
CASCADES OF PIERCE AND LEWIS COUNTIES-
327 AM PST WED JAN 13 2016

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST THIS
MORNING...

* ACCUMULATIONS...ADDTIONAL ACCUMULATIONS OF 5 TO 7 INCHES IS
  POSSIBLE THIS MORNING.

* TIMING...SNOW WILL CONTINUE THIS MORNING...THEN TRANSITION TO
  SNOW SHOWERS DURING THE AFTERNOON.

* SNOW LEVELS...3500 TO 4000 FEET...EXCEPT NEAR THE SURFACE IN THE
  PASSES THIS MORNING. 

* MAIN IMPACTS...SNOW COVERED OR SLIPPERY ROADS AS WELL AS REDUCED 
  VISIBILITIES AT TIMES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER
CONDITIONS ARE EXPECTED OR OCCURRING.  SIGNIFICANT AMOUNTS OF SNOW
ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN AN
EMERGENCY. IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT...FOOD...
AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY.

&&

$$

436 
WWUS46 KSEW 131813
WSWSEW

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
1013 AM PST WED JAN 13 2016

WAZ567>569-131915-
/O.EXP.KSEW.WS.W.0001.000000T0000Z-160113T1800Z/
CASCADES OF WHATCOM AND SKAGIT COUNTIES-
CASCADES OF SNOHOMISH AND KING COUNTIES-
CASCADES OF PIERCE AND LEWIS COUNTIES-
1013 AM PST WED JAN 13 2016

...WINTER STORM WARNING HAS EXPIRED...

HEAVY SNOW HAS ENDED. SNOW SHOWERS WILL GRADUALLY DECREASE TODAY.

$$

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SEATTLE WA
350 AM PST TUE JAN 12 2016

.SYNOPSIS...A FRONTAL SYSTEM WILL BRING RAIN AND LOCALLY BREEZY
CONDITIONS TODAY AND TONIGHT WITH MOUNTAIN SNOW...POSSIBLY HEAVY AT
TIMES OVERNIGHT. SHOWERS AND OR RAIN WILL PERSIST WEDNESDAY AND
THURSDAY AS A SERIES OF WEAK SYSTEMS MOVE ONSHORE OR BRUSH THE AREA.
UPPER LEVEL RIDGING WILL BUILD OVER THE REGION FRIDAY BRINGING A
BREAK IN THE WEATHER  BEFORE AN ACTIVE AND WET PATTERN RETURNS
THROUGH THE WEEKEND.

&&

.SHORT TERM...A WET FRONTAL SYSTEM WILL AFFECT THE AREA TODAY
AS WARM FRONTAL PRECIPITATION CONTINUES TO WORK INTO THE
INTERIOR THIS MORNING. EXPECT WIDESPREAD RAIN AND
AND MOUNTAIN SNOW THROUGH THE AFTERNOON AND EVENING. THE TRAILING
COLD FRONT MAY BRING HEAVY SNOW TO THE WEST SLOPES OF THE CASCADES
TONIGHT. SNOW LEVELS WILL LINGER AROUND 3500-5000 FT...EXCEPT
LOWER AT THE PASSES WHERE TEMPS WILL REMAIN NEAR OR BELOW FREEZING
WITH THE EAST WINDS. HAVE ISSUED A WINTER STORM WATCH FOR THE
CASCADES LATE THIS AFTERNOON THROUGH WEDNESDAY MORNING TO COVER
THE POTENTIAL HEAVY SNOW. CONDITIONS WILL TRANSITION TO SHOWERS
AS THE FRONT MOVES EAST OF THE CASCADES LATE TONIGHT. THE FIRST
OF TWO WEAK DISTURBANCES WILL BRING A FEW MORE SHOWERS ON
WEDNESDAY...AND RAIN AGAIN THURSDAY AS A WARM FRONT BRUSHES THE
AREA FROM THE SOUTHWEST. SHOWERS WILL LINGER THURSDAY NIGHT AS A
WEAK UPPER LEVEL TROUGH EASES INTO OREGON.

.LONG TERM...MEDIUM RANGE MODELS CONTINUE TO SHOW AN UPPER LEVEL
RIDGE BUILDING INTO THE PACIFIC NORTHWEST FRIDAY RESULTING IN A
MAINLY DRY DAY...WITH A FEW LINGERING SHOWERS OVER THE MOUNTAINS.
THE NEXT IN A SERIES OF FRONTS WILL BRING RAIN SATURDAY. THIS
SYSTEM CONTINUES TO LOOK FAIRLY WET. 00Z GFS AND ECMWF SHOWING
DIFFERENT SOLUTIONS FOR SUNDAY. THE GFS CONTINUES
TO SHOW WHAT AMOUNTS TO A BRIEF BREAK ON SUNDAY...WHILE THE ECMWF
KEEPS SUNDAY WET. CONFIDENCE IN THE GUIDANCE AT THAT RANGE IS
LOW...HOWEVER...DESPITE THE DIFFERENCES...MODELS CONTINUE TO
REINFORCE THE IDEA THAT THE PATTERN WILL REMAIN ACTIVE THROUGH
THE EXTENDED.

&&

.AVIATION...SOUTHWESTERLY FLOW ALOFT WILL CONTINUE TODAY AND TONIGHT
AS A FRONT DISSIPATES ALONG THE COAST. AT THE SURFACE SOUTHEASTERLY
FLOW WILL INCREASE. AIR MASS IS MOIST AND STABLE. RAIN ON THE COAST
WILL SPREAD INLAND THIS MORNING. MOSTLY VFR CONDITIONS WILL
DETERIORATE TO MVFR DURING THE DAY AND REMAIN MVFR TONIGHT.

KSEA...DISCUSSION ABOVE APPLIES. WIND WILL BE SOUTHERLY 5-8 KT TODAY
THEN INCREASE TO 10-15 KT TONIGHT. CHB

&&

.MARINE...A COLD FRONT ALONG THE COAST WILL BRING BRIEF SOUTHEAST
GALES OVER THE COASTAL WATER TODAY AND SMALL CRAFT ADVISORY STRENGTH
WINDS OVER THE INLAND WATERS. WIND WILL DIMINISH TONIGHT THOUGH
WESTERLY WIND DOWN THE STRAIT LATE TONIGHT COULD APPROACH GALE FORCE.

MORE FRONTS WILL REACH THE AREA AROUND THURSDAY AND SATURDAY. WINDS
APPEAR STRONG ENOUGH FOR A GALES ON THE COAST WITH BOTH SYSTEMS.

MINOR TIDAL OVERFLOW IS POSSIBLE THIS MORNING IN LOW LYING AREAS
NEXT TO PUGET SOUND AND HOOD CANAL. THE PREDICTED HIGH TIDE IS 12.75
FEET IN SEATTLE AND RECENT ANOMALIES HAVE BEEN RUNNING ABOUT HALF TO
THREE-QUARTERS OF A FOOT. MINOR TIDAL OVERFLOW BEGINS AROUND 13.5
FEET. A COASTAL FLOOD ADVISORY IS IN EFFECT FOR A FEW HOURS AROUND
THE TIME OF HIGH TIDE...7 AM AT SEATTLE. CHB

&&

.HYDROLOGY...RIVER FLOODING IS NOT EXPECTED FOR THE NEXT 7 DAYS.

&&

.SEW WATCHES/WARNINGS/ADVISORIES...

WA...WINTER STORM WATCH CASCADESTONIGHT THROUGH WEDNESDAY MORNING.
     COASTAL FLOOD ADVISORY EARLY THIS MORNING NEAR PUGET SOUND AND
     HOOD CANAL.
PZ...GALE WARNING COAST.
     SMALL CRAFT ADVISORY ALL OTHER WATERS.
     SMALL CRAFT ADVISORY FOR ROUGH GRAYS HARBOR BAR.

&&

WWW.WEATHER.GOV/SEATTLE

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