SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SEATTLE WA
939 PM PDT WED OCT 12 2016
WAZ001-503-504-506-507-509>517-555-556-558-559-567>569-131500-
SAN JUAN COUNTY-WESTERN WHATCOM COUNTY-SOUTHWEST INTERIOR-
WESTERN SKAGIT COUNTY-EVERETT AND VICINITY-TACOMA AREA-
ADMIRALTY INLET AREA-HOOD CANAL AREA-LOWER CHEHALIS VALLEY AREA-
OLYMPICS-EASTERN STRAIT OF JUAN DE FUCA-
WESTERN STRAIT OF JUAN DE FUCA-NORTH COAST-CENTRAL COAST-
EAST PUGET SOUND LOWLANDS-BELLEVUE AND VICINITY-SEATTLE AND VICINITY-
BREMERTON AND VICINITY-CASCADES OF WHATCOM AND SKAGIT COUNTIES-
CASCADES OF SNOHOMISH AND KING COUNTIES-
CASCADES OF PIERCE AND LEWIS COUNTIES-
939 PM PDT WED OCT 12 2016
…VERY STORMY WEATHER TO UNLEASH MULTIPLE IMPACTS ON WESTERN
WASHINGTON THROUGH THE WEEKEND…
AN IMPRESSIVELY STORMY PERIOD IS COMING UP FOR WESTERN WASHINGTON
FROM THURSDAY THROUGH THE WEEKEND. THE MAIN IMPACTS WILL BE FROM
FLOOD-PRODUCING RAINFALL AND DAMAGING WINDS. ALONG THE COAST…
GIANT WAVES AND COASTAL FLOODING ARE POSSIBLE THIS WEEKEND.
THE FIRST BIG INCREASE IN SOUTHERLY WIND WILL HAPPEN ON THE COAST
ON THURSDAY AFTERNOON…SPREADING INLAND ON THURSDAY NIGHT. THIS
WILL OCCUR FOLLOWING THE PASSAGE OF A DEEP LOW CENTER THROUGH THE
REGION. PLEASE REFER TO THE LATEST HIGH WIND WARNINGS FOR DETAILS
ON THE THURSDAY NIGHT STORM. HEFTY RAINFALL TOTALS ARE EXPECTED
THROUGH FRIDAY MORNING…RAINFALL AMOUNTS ARE EXPECTED TO BE: 1 TO
3 INCHES OVER THE INTERIOR LOWLANDS…2 TO 5 INCHES ALONG THE
COAST AND IN THE CASCADE MOUNTAINS…AND 4 TO 8 INCHES OVER THE
OLYMPIC MOUNTAINS. THIS WILL CAUSE RISES ON AREA RIVERS…WITH
FLOODING POSSIBLE ON A FEW. REFER TO THE LATEST FLOOD BULLETINS
FOR DETAILS.
FRIDAY WILL BE RAINY AND WINDY…BUT IT WILL SERVE AS A RELATIVE
LULL BEFORE A MORE POTENTIALLY DAMAGING STORM ON SATURDAY.
WE STILL HAVE MUCH TO LEARN ABOUT THE SATURDAY STORM. WHAT WE KNOW
IS THAT AN INCREDIBLY DEEP LOW PRESSURE CENTER…WITH ITS ORIGINS
TRACED BACK TO TYPHOON SONGDA IN THE WESTERN PACIFIC…WILL MOVE
INTO THE NORTHEAST PACIFIC AND PEAK IN STRENGTH ON SATURDAY.
WHAT REMAINS TO BE SEEN IS EXACTLY WHAT TRACK THE LOW CENTER WILL
TAKE. THIS WILL MAKE A HUGE DIFFERENCE IN HOW BADLY THIS STORM
IMPACTS WESTERN WASHINGTON. THERE IS A 1 IN 3 CHANCE OF THE LOW
CENTER DIRECTLY CROSSING SOME PART OF WESTERN WASHINGTON. THIS
WOULD BE A WORST CASE SCENARIO LEADING TO A HISTORICAL WINDSTORM
FOR NEARLY ALL OF WESTERN WASHINGTON THAT WOULD BE LONG
REMEMBERED.
THERE IS A 2 IN 3 CHANCE THAT THE LOW CENTER WILL PASS HUNDREDS OF
MILES OFF THE COAST…MAKING LANDFALL OVER CENTRAL OR NORTHERN
VANCOUVER ISLAND INSTEAD. THIS OUTCOME CONFINE THE MOST DAMAGING
WINDS TO THE COAST AND TO THE NORTH INTERIOR (AREAS NORTH OF
EVERETT)…BUT INLAND LOCATIONS SUCH AS THE PUGET SOUND REGION AND
THE I-5 CORRIDOR OF SOUTHWEST WASHINGTON WOULD EXPERIENCE THE TYPE
OF WINDSTORM THAT WOULD NORMALLY BE EXPECTED A FEW TIMES EACH
STORM SEASON. POWER OUTAGES AND TREE DAMAGE OVER INLAND LOCATIONS
WOULD BE LESS WIDESPREAD.
CHECK BACK REGULARLY FOR THE LATEST FORECASTS…WATCHES AND
WARNINGS. MAKE PREPARATIONS NOW FOR POWER OUTAGES…TREE
DAMAGE…AND OTHER IMPACTS. THE SATURDAY SYSTEM HAS THE HIGHEST
POTENTIAL FOR DAMAGE…BUT IT ALSO HAS THE GREATEST RANGE OF
POSSIBLE OUTCOMES.
$$
WWW.WEATHER.GOV/SEATTLE
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