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One product issued by NWS for: Mount St Helens WA
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Special Weather Statement

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PORTLAND OR
253 PM PST THU NOV 27 2014

ORZ001>008-010>016-WAZ019>022-039-040-045-046-281400-
NORTH OREGON COAST-CENTRAL OREGON COAST-
COAST RANGE OF NORTHWEST OREGON-
CENTRAL COAST RANGE OF WESTERN OREGON-LOWER COLUMBIA-
GREATER PORTLAND METRO AREA-CENTRAL WILLAMETTE VALLEY-
SOUTH WILLAMETTE VALLEY-NORTHERN OREGON CASCADE FOOTHILLS-
NORTHERN OREGON CASCADES-CASCADE FOOTHILLS IN LANE COUNTY-
CASCADES IN LANE COUNTY-UPPER HOOD RIVER VALLEY-
WESTERN COLUMBIA RIVER GORGE-CENTRAL COLUMBIA RIVER GORGE-
SOUTH WASHINGTON CASCADES-WILLAPA HILLS-SOUTH WASHINGTON COAST-I-
5 CORRIDOR IN COWLITZ COUNTY-GREATER VANCOUVER AREA-
SOUTH WASHINGTON CASCADE FOOTHILLS-
INCLUDING THE CITIES OF...ASTORIA...CANNON BEACH...TILLAMOOK...
LINCOLN CITY...NEWPORT...YACHATS...FLORENCE...VERNONIA...JEWELL...
SUNSET SUMMIT...LEES CAMP...TRASK...GRANDE RONDE...BURNT WOODS...
TIDEWATER...SWISSHOME...VENETA...ST. HELENS...CLATSKANIE...
HILLSBORO...PORTLAND...OREGON CITY...GRESHAM...SALEM...
MCMINNVILLE...WILSONVILLE...STAYTON...DALLAS...EUGENE...
SPRINGFIELD...CORVALLIS...ALBANY...SANDY...ESTACADA...
SILVER FALLS STATE PARK...SWEET HOME...GOVERNMENT CAMP...
DETROIT...SANTIAM PASS...VIDA...JASPER...LOWELL...COTTAGE GROVE...
MCKENZIE PASS...MCKENZIE BRIDGE...OAKRIDGE...WILLAMETTE PASS...
PARKDALE...ODELL...CORBETT...ROOSTER ROCK...MULTNOMAH FALLS...
CASCADE LOCKS...HOOD RIVER...COLDWATER RIDGE VISITORS CENTER...
MOUNT ST. HELENS...WIND RIVER VALLEY...WILLAPA...FRANCES...
ELK MOUNTAIN...RYDERWOOD...RAYMOND...LONG BEACH...OCEAN PARK...
NASELLE...CATHLAMET...LONGVIEW...KELSO...CASTLE ROCK...
VANCOUVER...BATTLE GROUND...WASHOUGAL...TOUTLE...ARIEL...
LAKE MERWIN...YALE LAKE...COUGAR...CARSON...STEVENSON...UNDERWOOD
253 PM PST THU NOV 27 2014

...UNSEASONABLY MILD WEATHER TO GIVE WAY TO MUCH COLDER
TEMPERATURES AND POSSIBLE LOW ELEVATION SNOW THIS WEEKEND...

WHILE SOUTHWEST WASHINGTON AND NORTHWEST OREGON HAVE BEEN
EXPERIENCING RECORD SETTING WARMTH FOR THE LAST SEVERAL DAYS...A
MAJOR CHANGE IN THE WEATHER PATTERN IS ON THE WAY. A STRONG COLD
FRONT WILL MOVE THROUGH THE REGION FROM NORTH TO SOUTH ON FRIDAY
AND FRIDAY EVENING. WHILE SNOW LEVELS WILL INITIALLY BE HIGH...
THEY WILL LOWER DRAMATICALLY BEHIND THE FRONT. AS A RESULT...POST
FRONTAL SHOWERS MAY FALL AS A MIX OF RAIN AND SNOW DOWN TO THE
VALLEY FLOOR FRIDAY NIGHT AND SATURDAY BEFORE THE PRECIPITATION
ENDS BY SATURDAY NIGHT.

TRAVEL WILL BECOME INCREASINGLY DIFFICULT THROUGH THE CASCADES AND
EVENTUALLY THE FOOTHILLS FRIDAY NIGHT AS RAIN CHANGES TO SNOW AND
STARTS TO ACCUMULATE ON AREA ROADS. SEVERAL INCHES OF NEW SNOW ARE
POSSIBLE IN THESE AREAS BY THE TIME SNOW TAPERS OFF SATURDAY
NIGHT.

OFFSHORE FLOW WILL THEN DEVELOP SATURDAY NIGHT...WITH GUSTY EAST
WINDS CONTINUING THROUGH SUNDAY. THIS FLOW WILL USHER IN A PERIOD
OF MUCH COLDER TEMPERATURES AS IT PULLS IN AIR FROM AN ARCTIC AIR
MASS ON THE EAST SIDE OF THE CASCADES.

$$

CULLEN/WEAGLE




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