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National Weather Service forecast for possible heavy rains tomorrow and flood watch on Plateau area

THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A

* FLOOD WATCH FOR MUCH OF WESTERN WASHINGTON...INCLUDING THE
  FOLLOWING COUNTIES...GRAYS HARBOR...CLALLAM...ISLAND...
  JEFFERSON...SAN JUAN...SKAGIT...WHATCOM...KING...KITSAP...
  LEWIS...MASON...PIERCE...SNOHOMISH...AND THURSTON.

* FROM THURSDAY AFTERNOON THROUGH FRIDAY AFTERNOON

* SIGNIFICANT RAINFALL IS ANTICIPATED THURSDAY AFTERNOON THROUGH
  FRIDAY...WITH THE HEAVIEST RAINFALL EXPECTED FROM THE OLYMPIC
  RANGE EASTWARD. POTENTIALLY 1 TO 2 INCHES OF RAIN...WITH LOCAL
  AMOUNTS UP TO 4 INCHES IN THE CASCADES...COULD FALL DURING THIS
  PERIOD. IN ADDITION...THUNDERSTORMS ON THURSDAY COULD PRODUCE
  RAIN RATES OF AN INCH IN ONE HOUR OR LESS.

* THE POTENTIALLY EXCESSIVE RAINFALL COULD LEAD TO URBAN AND SMALL
  STREAM FLOODING. A SHORT PERIOD OF INTENSE RAINFALL ON THURSDAY
  COULD CAUSE FLASH FLOODING AND OVERWHELM STORM DRAINS...LEADING
  TO FLOODED ROADS. MUD OR ROCK SLIDES ARE ALSO POSSIBLE IN STEEP
  MOUNTAINOUS TERRAIN. EXPECT SIGNIFICANT RISES ON AREA RIVERS BUT
  FLOODING IS UNLIKELY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLOOD WATCH MEANS CONDITIONS ARE FAVORABLE FOR FLOODING BUT
FLOODING IS NOT IMMINENT OR OCCURRING. MONITOR THE LATEST
FORECASTS FROM THE NATIONAL WEATHER SERVICE AND BE READY TO ACT
QUICKLY IF FLOODING IS OBSERVED OR A WARNING IS ISSUED.

 

Special Weather Statement

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SEATTLE WA
550 AM PDT WED SEP 4 2013

WAZ001-503>519-042300-
SAN JUAN COUNTY-WESTERN WHATCOM COUNTY-SOUTHWEST INTERIOR-
EAST PUGET SOUND LOWLANDS-WESTERN SKAGIT COUNTY-
EVERETT AND VICINITY-SEATTLE/BREMERTON AREA-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-
WEST SLOPES NORTHERN CASCADES AND PASSES-
WEST SLOPES CENTRAL CASCADES AND PASSES-
550 AM PDT WED SEP 4 2013

...LOCALLY HEAVY RAINFALL IS POSSIBLE OVER WESTERN WASHINGTON
THURSDAY THROUGH FRIDAY...

A SLOW MOVING UPPER LEVEL LOW PRESSURE SYSTEM SITTING OFF THE OREGON
COAST IS EXPECTED TO DRIFT EAST TODAY. THE LOW WILL MOVE OVER OREGON
ON THURSDAY AND INTO CENTRAL WASHINGTON ON FRIDAY. AS THE LOW
APPROACHES AND MOVES INTO THE AREA...SHOWERS AND THUNDERSTORMS WILL
INCREASE ON THURSDAY AND CONTINUE INTO FRIDAY. THESE STORMS WILL
LIKELY PRODUCE LOCALLY HEAVY RAINFALL AMOUNTS.

FORECASTING THE MOVEMENT AND TIMING OF UPPER LEVEL LOWS CAN BE QUITE
DIFFICULT. CURRENTLY IT LOOKS LIKE THE HEAVIEST RAINFALL WILL BE
BETWEEN MIDDAY THURSDAY AND MIDDAY FRIDAY WITH 1 TO 2 INCHES
POSSIBLE OVER THE LOWLANDS AND UP TO 4 INCHES LOCALLY IN THE
CASCADES.

EXCESSIVE RAINFALL RATES CAN OVERWHELM STORM DRAINAGE IN URBAN
AREAS...LEADING TO URBAN FLOODING. THIS CAN ALSO RESULT IN
FLOODING OF SMALL STREAMS.

SINCE WEATHER CONDITIONS WITH UPPER LOWS CAN EVOLVE QUICKLY...
PEOPLE ACROSS WESTERN WASHINGTON ARE URGED TO STAY TUNED TO LATEST
FORECASTS AND UPDATES.

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