Flood Watch issued December 18 at 4:24PM PST until December 20 at 4:00PM PST by NWS Portland OR
* WHAT...Flooding caused by excessive rainfall continues to be
possible.
* WHERE...Portions of Oregon, including the following areas, Benton
County Lowlands, Cascade Foothills of Marion and Linn Counties,
Cascades of Lane County, Cascades of Marion and Linn Counties,
Central Coast of Oregon, Central Columbia River Gorge I-84
Corridor, Central Oregon Coast Range, Central Oregon Coast Range
Lowlands, Clackamas County Cascade Foothills, Clatsop County
Coast, East Central Willamette Valley, East Portland Metro, Inner
Portland Metro, Lane County Cascade Foothills, Lane County
Lowlands, Linn County Lowlands, Lower Columbia River, North Oregon
Cascades, North Oregon Coast Range, North Oregon Coast Range
Lowlands, Outer Southeast Portland Metro, Portland West Hills and
Chehalem Mountain, Tillamook County Coast, Tualatin Valley, Upper
Hood River Valley, West Central Willamette Valley, West Columbia
River Gorge I-84 Corridor and West Columbia River Gorge of Oregon
above 500 ft and southwest Washington, including the following
areas, Central Columbia River Gorge SR 14 Corridor, Cowlitz County
Lowlands, East Clark County Lowlands, Inner Vancouver Metro, North
Clark County Lowlands, South Washington Cascade Foothills, South
Washington Cascades, South Washington Coast, West Columbia River
Gorge SR 14 Corridor, Willapa Hills and Willapa and Wahkiakum
Lowlands.
* WHEN...Through Saturday afternoon.
* IMPACTS...Excessive runoff may result in flooding of rivers,
creeks, streams, and other low-lying and flood-prone locations.
Flooding may occur in poor drainage and urban areas. Storm drains
and ditches may become clogged with debris. Area creeks and
streams are running high and could flood with more heavy rain.
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.
* ADDITIONAL DETAILS...
- An atmospheric river is forecast to bring periods of heavy
rain to northwestern Oregon and southwestern Washington
today. This system occurs at a time when area rivers continue
to run high and soils remain saturated following heavy rain
earlier in the month. During initial heavy rainfall today,
the urban and small stream flooding threat will be most
urgent, although the details of precise timing and location
of the highest risk remains uncertain at this time. As runoff
works its way downstream, the river flooding threat will
increase tonight into Friday, with numerous area rivers now
forecast to reach at least Minor flood stage. Slower reacting
rivers may stay in flood stage into Saturday afternoon.
- http://www.weather.gov/safety/flood
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.
Varoitus voimassa pe klo 2:24 - su klo 2:00
