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Winter weather message from National Weather Service

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE SEATTLE WA
314 PM PST MON FEB 21 2011

SNOW WILL INCREASE IN THE MOUNTAINS THIS EVENING AND WILL
CONTINUE THROUGH TUESDAY NIGHT AS COLD AIR ALOFT AND STRONG
NORTHWEST FLOW MOVES INTO WESTERN WASHINGTON. SNOWFALL
ACCUMULATIONS OVER A 24-HOUR PERIOD FROM LATE TONIGHT THROUGH
TUESDAY NIGHT MAY REACH 18 TO 24 INCHES IN THE CASCADES AND
PASSES AND 10 TO 18 INCHES IN THE OLYMPICS.

IN THE LOWLANDS...EXPECT BRIEF AND LOCAL ACCUMULATIONS OF SLUSHY
SNOW TO OCCUR LATE TONIGHT THROUGH EARLY WEDNESDAY MORNING. THIS
IS MOST LIKELY TO OCCUR ON HILLS ABOVE ABOUT 500 FEET TUESDAY
MORNING AND ABOVE 300 FEET LATE TUESDAY NIGHT AND EARLY WEDNESDAY
MORNING...AND MAINLY WHERE CONVERGENCE ZONES SET UP IN THE NORTH
INTERIOR AND NORTHERN PORTIONS OF THE EAST PUGET SOUND LOWLANDS.
SNOW LEVELS

AN ARCTIC AIR MASS DROPPING SOUTH FROM BRITISH COLUMBIA...COMBINED
WITH DEVELOPING LOW PRESSURE OFF THE WASHINGTON COAST WILL GIVE
THE POTENTIAL FOR HEAVY SNOW IN THE NORTH INTERIOR OF WESTERN
WASHINGTON BEGINNING WEDNESDAY MORNING AND CONTINUING THROUGH
THURSDAY MORNING. SNOWFALL IN WESTERN WHATCOM COUNTY AND THE SAN
JUAN ISLANDS WILL LIKELY BE ACCOMPANIED BY STRONG NORTHEASTERLY
WINDS OF 25 TO 35 MPH AND GUSTS TO 50 MPH.

WAZ001-503-505>507-510-514-515-221215-
/O.NEW.KSEW.WS.A.0004.110223T1500Z-110224T2000Z/
SAN JUAN COUNTY-WESTERN WHATCOM COUNTY-EAST PUGET SOUND LOWLANDS-
WESTERN SKAGIT COUNTY-EVERETT AND VICINITY-ADMIRALTY INLET AREA-
EASTERN STRAIT OF JUAN DE FUCA-WESTERN STRAIT OF JUAN DE FUCA-
314 PM PST MON FEB 21 2011

...WINTER STORM WATCH IN EFFECT FROM WEDNESDAY MORNING THROUGH
THURSDAY MORNING FOR THE INTERIOR LOWLANDS OF WESTERN WASHINGTON
FROM SNOHOMISH COUNTY AND THE STRAIT OF JUAN DE FUCA NORTHWARD TO
THE CANADIAN BORDER...INCLUDING THE EASTERN PUGET SOUND LOWLANDS...

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A WINTER STORM
WATCH FOR THE INTERIOR LOWLANDS OF WESTERN WASHINGTON
FROM SNOHOMISH COUNTY AND THE STRAIT OF JUAN DE FUCA NORTHWARD TO
THE CANADIAN BORDER AND INCLUDING THE EASTERN PUGET SOUND LOWLANDS...
WHICH IS IN EFFECT FROM WEDNESDAY MORNING THROUGH THURSDAY
MORNING.

* SOME AFFECTED LOCATIONS...BELLINGHAM...FRIDAY HARBOR...PORT
  ANGELES...OAK HARBOR...MOUNT VERNON...EVERETT...NORTH BEND.


* ACCUMULATIONS...SNOWFALL ACCUMULATIONS OF 4 TO 6 INCHES ARE
  LIKELY.


* TIMING...WHILE BRIEF SLUSHY ACCUMULATIONS ARE POSSIBLE IN
  SHOWERS LATE TONIGHT THROUGH EARLY WEDNESDAY MORNINGS...THE MAIN
  PERIOD OF SIGNIFICANT ACCUMULATING SNOW IS EXPECTED TO BEGIN
  OVER WESTERN WHATCOM COUNTY EARLY WEDNESDAY MORNING AND SLIDE
  SOUTH THROUGH THE REMAINDER OF THE NORTH INTERIOR AND EAST PUGET
  SOUND LOWLANDS DURING THE DAY WEDNESDAY. SNOW MAY CONTINUE
  WEDNESDAY NIGHT INTO THURSDAY MORNING FOR FURTHER ACCUMULATIONS.
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