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Oregon, Central Willamette Valley

Areal Flood Watch

Statement as of 8:21 AM PST on December 20, 2014

Expires 7:00 PM EST on December 22, 2014


... Flood Watch remains in effect from 4 PM PST this afternoon
through Monday afternoon for southwest Washington and northwest
Oregon...

The Flood Watch continues for southwest Washington and northwest
Oregon from 4 PM PST this afternoon through Monday afternoon.


A classic atmospheric river type precipitation event is setting up
over the Pacific northwest today... which will continue to impact
the region into early Monday. A very long fetch of moisture with
origins west to the South China Sea is feeding into this
system... bringing the potential for very large rainfall totals
across the region. A deep and moist westerly flow will develop
today and continue through Sunday. With the flow forecasted to
remain perpendicular to the Coast Range and Cascades for an
extended period of time... expect strong orographic enhancement to
lead to the highest rainfall totals over the mountains. The Coast
Range... foothills and Cascades are expected to see in the range of
6 to 12 inches of rain... with locally higher amounts possible.
Lower but still significant totals are expected for the lower
terrain. Projected rainfall along the coast is forecasted to be
around 4 to 8 inches. The interior lowlands should see 1 to 4
inches... with the highest amounts closer to the Cascade foothills.

Given the latest forecasted rainfall totals... it appears that
there is the strong potential for flooding over the weekend on
numerous rivers and tributaries draining the Coast Range and
Cascades. A few rivers may even reach major flood stage. The
Current River stage forecasts indicate that the faster responding
rivers could reach flood stage as early as tonight. There are also likely
to be impacts from Urban and Small Stream flooding and flooding
along low lying pasture land.

In addition to the flooding concerns... excessive rainfall has the
potential to create landslides... debris flows... and excessive runoff
in the vicinity of recent wildfire burn scars. Burn scars from two
large fires this Summer... the 36 pit fire in the Clackamas river
basin near Estacada and the deception complex near Oakridge... will
be particularly vulnerable.


Precautionary/preparedness actions...

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

Landslides and debris flows are possible during this flood event.
People... structures and roads located below steep slopes... in
canyons and near the mouths of canyons may be at serious risk
from rapidly moving landslides.

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.

The next update for this watch will be issued by 10 PM Saturday
night.




Weather Severe Map
American Samoa - Flash Flood Watch
California - Coastal Flood Advisory , High Surf Advisory, Coastal Flood Advisory , Coastal Flood Advisory, High Surf Advisory , High Surf Advisory , Wind Advisory , High Wind Warning, Wind Advisory , Beach Hazard Statement , Public Information Statement
Colorado - Winter Weather Advisory , Winter Storm Warning , Public Information Statement
Connecticut - Special Statement
Guam - High Surf Advisory
Hawaii - High Surf Advisory , High Surf Warning
Idaho - Wind Advisory , Winter Weather Advisory , Winter Storm Warning , Avalanche Warning , Record Report
Indiana - Public Information Statement
Kansas - Dense Fog Advisory
Kentucky - Public Information Statement
Louisiana - Record Report
Massachusetts - Special Statement
Michigan - Special Statement
Minnesota - Winter Storm Watch , Special Statement
Mississippi - Record Report
Montana - High Wind Watch , High Wind Warning , Wind Advisory , Winter Storm Warning , Freezing Rain Advisory , Winter Weather Advisory
Nebraska - Dense Fog Advisory
Nevada - Winter Weather Advisory
North Dakota - Special Statement
Oregon - Flood Warning , High Surf Advisory, Areal Flood Watch , Areal Flood Watch , Coastal Flood Advisory, High Surf Advisory, Areal Flood Watch , Flood Watch , Wind Advisory , High Wind Warning , High Wind Warning, Wind Advisory
Rhode Island - Special Statement
Texas - Record Report
Utah - Winter Storm Warning , Winter Storm Watch , Avalanche Warning , Public Information Statement
Washington - Flood Warning , Areal Flood Watch , Coastal Flood Advisory, High Surf Advisory, Areal Flood Watch , Areal Flood Watch , Wind Advisory , High Wind Warning , Winter Weather Advisory
Wyoming - High Wind Warning , High Wind Watch , Winter Storm Warning , Winter Storm Watch , Public Information Statement
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