Flood Potential Outlook
Issued by NWS Seattle/Tacoma, WA

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HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE SEATTLE WA
511 PM PST Tue Jan 23 2018

...HEAVY RAIN COULD LEAD TO THE POSSIBILITY OF FLOODING IN WESTERN
WASHINGTON THIS WEEKEND INTO EARLY NEXT WEEK...

A wet and mild air mass is anticipated to develop this weekend,
resulting in snow levels rising above 5500 feet and periods of
heavy rain. Strong southwest winds will result in the heaviest
rains falling on the southwest-facing slopes of the Olympics and
Cascades. At this time, total rainfall amounts in the mountains
are anticipated to be in the 7 to 12 inch range on the Olympics
and the 4 to 8 inch range in the Cascades. The lowlands could pick
up 1 to 4 inches of rain during the same period. This amount of
rain on top of what has already fallen, and what is expected the
next couple of days, could lead to flooding on many rivers as
well as cause urban and/or small stream flooding.

In addition to the potential for flooding, the landslide threat
will continue to increase. Periods of heavy rain this weekend on
top of nearly saturated soils would serve to significantly
increase the threat of landslides.

The location, timing, and actual rainfall amounts were still
uncertain at this time. However, it does appear that a period of
significant rainfall will occur this weekend.

Please monitor the latest forecasts from the National Weather
Service on this potential flood event.

$$

www.weather.gov/seattle



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