Issue Date: 228 PM PST Mon Dec 17 2018
Expiration: 1830 GMT 18 2018
...FLOOD WATCH NOW IN EFFECT FROM MIDNIGHT PST TONIGHT THROUGH
The Flood Watch is now in effect for
* Portions of Northwest Oregon and Southwest Washington,
including the following areas, in Northwest Oregon, Central
Coast Range of Western Oregon, Central Oregon Coast, Central
Willamette Valley, Coast Range of Northwest Oregon, Greater
Portland Metro Area, Lower Columbia, North Oregon Coast,
Northern Oregon Cascade Foothills, and Upper Hood River
Valley. In Southwest Washington, Central Columbia River Gorge,
Greater Vancouver Area, I-5 Corridor in Cowlitz County, South
Washington Cascade Foothills, South Washington Coast, Western
Columbia River Gorge, and Willapa Hills.
* From midnight PST tonight through Wednesday afternoon
* A long period of moderate rain with embedded periods of heavy
rain starting Monday afternoon and lasting through Tuesday
morning will result in sharp rises on many rivers and creeks
across Northwest Oregon and Southwest Washington. Minor flooding
is possible. In addition to river and creek flooding, widespread
urban flooding is possible in the Northern Willamette Valley and
Portland Metro Area. In these areas, there may be water entering
underground portions of buildings and parking garages as well as
multiple feet of water in flood-prone paved areas such as low
or dipping freeway ramps.
* Rainfall totals of 2.5 to 5 inches are expected for the coast,
with 3 to 8 inches in the Willapa Hills, Coast Range, Cascades,
and Cascade foothills. Meanwhile, 1.5 to 3 inches of rain are
expected across the inland valleys.
* Rivers of particular concern include the Grays River in
Wahkiakum County, the Wilson River in Tillamook County, the
Siletz River in Lincoln County, the Upper Tualatin River in
Washington County, the Clackamas River in Clackamas County, and
Johnson Creek in Multnomah and Clackamas counties, and the
Luckiamute River in Benton and Polk counties.
A Flood Watch means there is a potential for flooding based on
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.
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 may want to see if there are any Special Weather Statements