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2 products issued by NWS for: Downtown Seattle WA
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Flood Watch

FLOOD WATCH...UPDATED
NATIONAL WEATHER SERVICE SEATTLE WA
1234 PM PST FRI DEC 19 2014

WAC009-027-031-033-041-045-053-057-061-067-073-200845-
/O.EXT.KSEW.FA.A.0015.141221T0000Z-141222T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CLALLAM-GRAYS HARBOR-JEFFERSON-KING-LEWIS-MASON-PIERCE-SKAGIT-
SNOHOMISH-THURSTON-WHATCOM-
1234 PM PST FRI DEC 19 2014

...FLOOD WATCH IN EFFECT FROM SATURDAY AFTERNOON THROUGH LATE
SUNDAY NIGHT...


* PORTIONS OF WESTERN WASHINGTON...INCLUDING THE FOLLOWING
  COUNTIES... GRAYS HARBOR...CLALLAM...JEFFERSON...SKAGIT...
  WHATCOM...KING...LEWIS...MASON...PIERCE...SNOHOMISH...THURSTON.

* FROM SATURDAY AFTERNOON THROUGH LATE SUNDAY NIGHT

* HEAVY RAIN IS FORECAST OVER WESTERN WASHINGTON SATURDAY AND
  SUNDAY...ESPECIALLY IN THE MOUNTAINS. STRONG WESTERLY FLOW
  ALOFT WILL BRING HEAVY RAIN AT TIMES TO THE COAST AND OLYMPICS
  ON SATURDAY. HEAVY RAIN WILL SPREAD INTO THE CASCADES SATURDAY
  AFTERNOON. MODELS CURRENTLY TAPER RAIN OVER THE OLYMPICS ON
  SUNDAY BUT KEEP HEAVY RAIN GOING IN THE CASCADES THROUGH SUNDAY
  NIGHT...ESPECIALLY OVER THE CASCADES FROM ABOUT KING COUNTY
  SOUTH. THE TOTAL MODEL RAINFALL OVER ABOUT 48 HOURS FROM
  SATURDAY MORNING THROUGH SUNDAY NIGHT AMOUNTS TO AROUND THREE
  TO SIX INCHES OVER THE OLYMPICS AND CENTRAL CASCADES WITH A
  NINE- INCH BULLS-EYE OVER MOUNT RAINIER. RAINFALL OVER THE
  LOWLANDS WILL GENERALLY BE AN INCH OR LESS AS THE WESTERLY FLOW
  CAUSES A RAINSHADOW EAST OF THE OLYMPICS.

* THESE RAINFALL AMOUNTS ARE ENOUGH TO CAUSE FLOODING. AT THIS
  TIME THE RIVERS MOST LIKELY TO FLOOD ARE THE ONES FLOWING OFF
  THE CASCADES OF KING...PIERCE...AND LEWIS COUNTIES...AS WELL AS
  THE UNUSUALLY FLOOD-PRONE SKOKOMISH RIVER IN MASON COUNTY. ANY
  FLOODING WOULD LIKELY BEGIN SATURDAY NIGHT ON THE OLYMPICS AND
  SUNDAY FOR THE CASCADES...WITH CRESTS SUNDAY NIGHT OR MONDAY.
  THE EXACT POSITION OF THE STREAM OF MOISTURE IS UNCERTAIN SO
  THIS OUTLOOK COVERS THE ENTIRE OLYMPIC PENINSULA AND ALL OF THE
  CASCADES RIVERS.

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.

&&

$$








Hydrologic Outlook

HYDROLOGIC OUTLOOK
WAC009-027-031-033-041-045-053-057-061-067-073-200000-

HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE SEATTLE WA
132 PM PST THU DEC 18 2014

...HEAVY RAIN COULD CAUSE FLOODING BY LATE THIS WEEKEND...

HEAVY RAIN IS FORECAST OVER WESTERN WASHINGTON SATURDAY AND
SUNDAY. STRONG WESTERLY FLOW ALOFT WILL BRING HEAVY RAIN AT TIMES
TO THE COAST AND OLYMPICS ON SATURDAY. HEAVY RAIN WILL SPREAD
INTO THE CASCADES SATURDAY AFTERNOON. MODELS CURRENTLY TAPER RAIN
OVER THE OLYMPICS ON SUNDAY BUT KEEP HEAVY RAIN GOING IN THE
CASCADES...ESPECIALLY OVER THE CASCADES FROM ABOUT KING COUNTY
SOUTH. THE TOTAL MODEL RAINFALL OVER ABOUT 48 HOURS FROM SATURDAY
MORNING THROUGH SUNDAY NIGHT AMOUNTS TO AROUND FOUR TO SIX INCHES
OVER THE OLYMPICS AND CENTRAL CASCADES WITH A TEN-INCH BULLSEYE
OVER MOUNT RAINIER.

THESE RAINFALL AMOUNTS ARE ENOUGH TO CAUSE FLOODING. AT THIS TIME
THE RIVERS MOST LIKELY TO FLOOD ARE THE ONES FLOWING OFF THE
CASCADES OF KING...PIERCE...AND LEWIS COUNTIES...AS WELL AS THE
UNUSUALLY FLOOD-PRONE SKOKOMISH RIVER IN MASON COUNTY. ANY FLOODING
WOULD LIKELY BEGIN SUNDAY WITH CRESTS SUNDAY NIGHT OR MONDAY. THE
EXACT POSITION OF THE STREAM OF MOISTURE IS UNCERTAIN SO THIS
OUTLOOK COVERS THE ENTIRE OLYMPIC PENINSULA AND ALL OF THE
CASCADES RIVERS.

$$






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Page last modified: May 16, 2007
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