Flash Flood Watch
Issued by NWS Seattle/Tacoma, WA

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WGUS66 KSEW 211159
FFASEW

Flood Watch
National Weather Service Seattle WA
359 AM PST Tue Nov 21 2017

WAC009-027-031-033-041-045-053-057-061-067-073-220030-
/O.CON.KSEW.FA.A.0006.171122T0000Z-171124T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clallam-Grays Harbor-Jefferson-King-Lewis-Mason-Pierce-Skagit-
Snohomish-Thurston-Whatcom-
359 AM PST Tue Nov 21 2017

...FLOOD WATCH REMAINS IN EFFECT FROM THIS AFTERNOON THROUGH
THURSDAY AFTERNOON...

The Flood Watch continues for

* Portions of northwest Washington and west central Washington,
  including the following counties, in northwest Washington,
  Clallam, Grays Harbor, Jefferson, Mason, Skagit, and Whatcom.
  In west central Washington, King, Lewis, Pierce, Snohomish,
  and Thurston.

* From this afternoon through Thursday afternoon

* A warm front and the plume of subtropical moisture with it will
  bring 2 to 5.5 inches of rain to the Olympics and Mount Rainier
  today and tonight, and 1 to 4 inches of rain to the Cascades
  north of Mount Rainier. The snow level will be near 8000 feet. A
  second frontal system will bring another 1 to 4 inches on
  Wednesday night and Thursday, with the snow level falling from
  7000 feet to 4000 feet as the system moves through.

* The two systems in close succession presents a threat of
  flooding on rivers in Western Washington. Flooding could begin
  tonight or Wednesday. It looks like the threat is for a
  relatively minor flooding episode.

* Models show several rivers cresting near or just above flood
  stage including the Skokomish, Cowlitz, Nisqually, White,
  Snoqualmie, Stillaguamish, Skagit, and Nooksack. However, this
  doesn`t mean that the possibility of flooding is limited to
  these rivers.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Watch means there is a potential for flooding based on
current forecasts.

You should monitor later forecasts and be alert for possible
Flood Warnings. Those living in areas prone to flooding should be
prepared to take action should flooding develop.

&&

$$

www.weather.gov/seattle


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