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Oregon, Lower Columbia

Special Statement

Statement as of 3:37 PM PST on December 18, 2014

Expires 6:00 PM EST on December 19, 2014


... Flooding threat increasing Saturday night through Monday for
northwest Oregon and southwest Washington rivers...

Strong and deep moist westerly flow will begin crossing the pacnw
coast Saturday morning. A very long fetch of moisture is stretching
across the Pacific with origins west to the South China Sea and has
above average potential to bring heavy rains to the area. As
such... this continues to give the appearance of a classic high
precipitation atmospheric river event where the deep moist flow will
spend a significant amount of time on a nearly perpendicular course
against the Coast Range with the Cascades taking a bit higher of the
impact. Latest forecasts for Friday night through Monday afternoon
bring 8 to 12 inches of rain to the Cascades and foothills... 7 to
11 inches for the Coast Range... 5 to 7 inches along the immediate
coast... and 3 to 4 inches along the I-5 corridor.

Given latest data... it appears multiple Coast Range rivers have a
moderate potential of exceeding flood stage. Additionally... this
event has sufficient depth to bring significant rains to the north
Oregon and South Washington Cascades where rivers will also see
potential for notable flooding.

Keep in mind that details will always be in flux under these
scenarios as subtle north or south shifts cold make dramatic
differences in which basins receive extended periods of moderate to
heavy rain. Please continue to follow the latest forecasts and
impacts as conditions warrant.

Stay up to date with the latest NWS forecasts at
weather.Gov/Portland or Mobile.Weather.Gov

River forecasts are available on our web Page at
http://water.Weather.Gov/ahps2/index.Php?Wfo=pqr (all lower case)


Weather Severe Map
Arkansas - Dense Fog Advisory , Record Report
American Samoa - Flash Flood Watch
California - High Surf Advisory , High Surf Advisory, Coastal Flood Advisory , Winter Weather Advisory
Colorado - Winter Storm Watch , Special Statement , Public Information Statement
Hawaii - High Surf Advisory
Idaho - Winter Storm Watch , Special Weather Statement
Kansas - Dense Fog Advisory , Special Statement
Louisiana - Flood Watch
Maryland - Special Statement
Michigan - Winter Weather Advisory
Minnesota - Special Statement
Missouri - Dense Fog Advisory
Montana - Winter Weather Statement , Dense Fog Advisory
Nebraska - Special Statement
New Mexico - Dense Fog Advisory
New York - Winter Weather Advisory
North Dakota - Dense Fog Advisory , Special Statement
Ohio - Winter Weather Advisory
Oklahoma - Dense Fog Advisory
Oregon - High Surf Advisory , Special Statement
Pennsylvania - Winter Weather Advisory , Special Statement
South Dakota - Special Statement
Tennessee - Special Statement
Texas - Areal Flood Advisory , Dense Fog Advisory
Utah - Winter Storm Watch , Special Statement
Washington - High Surf Advisory , High Surf Advisory, Coastal Flood Watch , High Wind Watch , Winter Weather Advisory , Air Stagnation Advisory , Special Statement , Record Report
West Virginia - Winter Weather Advisory , Special Statement
Wisconsin - Areal Flood Warning , Special Weather Statement
Wyoming - High Wind Watch , Winter Storm Watch , Dense Fog Advisory , Special Statement
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