Public Information Statement
Issued by NWS Seattle/Tacoma, WA

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NOUS46 KSEW 171634
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Public Information Statement
National Weather Service Seattle WA
933 AM PDT Tue Apr 17 2018

...Implementation of New Hydrologic Services for the Samish River,
Pilchuck River, Issaquah Creek, and Calawah/Bogachiel Rivers...

New National Weather Service (NWS) hydrologic services have been
implemented for the Seattle Weather Forecast Office hydrologic
services area.

A new river forecast/flood warning point on the Samish River was
added to the NWS`s flood warning program. The gage point will be the
U.S. Geological Survey stream gage Samish River near Burlington in
Skagit County.

New river forecasts and flood warnings for the Samish River gage
will address flooding along the river to the mouth at Samish Bay,
including the town of Allen. Here are the flood levels for the three
flood categories:

Minor Flood Flow/flood warning level.....3,000 cubic feet per second
                                              (cfs)
Moderate Flood Flow......................7,000 cfs
Major Flood Flow........................11,000 cfs

In addition, new river forecasts are now being provided for three
rivers that are already in the flood warning program. These are the
following: Pilchuck River near Snohomish, Issaquah Creek at
Issaquah, and the Calawah River near Forks for the Bogachiel River
near La Push.

These rivers are official flood warning locations but did not
previously have modeled river forecasts. New river models for these
locations were implemented as well. Although the Calawah River is
not part of the flood warning program, forecasts for that river will
be used to produce the river forecasts for the flood warning point
on the Bogachiel River.

The river forecasts have been added to the river plots on the NWS
Advanced Hydrologic Prediction Service webpage at:

https://water.weather.gov/ahps2/index.php?wfo=sew

If you would like more information about the National Weather
Service hydrologic services in the Seattle area, please contact
Brent Bower, Senior Service Hydrologist, at 206-526-6095.

$$

weather.gov/seattle

jbb


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