Flood Watch issues for Northwest Oregon and Coastal areas

Flood Watch
National Weather Service Portland OR
239 PM PST Sun Dec 16 2018

North Oregon Coast-Central Oregon Coast-
Coast Range of Northwest Oregon-
Central Coast Range of Western Oregon-Lower Columbia-
Greater Portland Metro Area-Central Willamette Valley-
Northern Oregon Cascade Foothills-Upper Hood River Valley-
Willapa Hills-South Washington Coast-I-
5 Corridor in Cowlitz County-Greater Vancouver Area-
South Washington Cascade Foothills-Western Columbia River Gorge-
Central Columbia River Gorge-
239 PM PST Sun Dec 16 2018


The National Weather Service in Portland has issued a

* Flood Watch for portions of Northwest Oregon and Southwest
  Washington, including the South Washington Coast and Willapa
  Hills, the Washington side of the Western and Central Columbia
  River Gorge, South Washington Cascade Foothills, the North and
  Central Oregon Coast, North and Central Coast Range of Western
  Oregon, the Lower Columbia and I-5 Corridor, Greater Portland
  and Vancouver Metro Area, Central Willamette Valley, Northern
  Oregon Cascade Foothills, and Upper Hood River Valley

* From late Monday night through Wednesday afternoon

* Periods of heavy rain starting Monday afternoon through Tuesday
  will result in sharp rises on many rivers and creeks across
  Northwest Oregon and Southwest Washington, and minor flooding is

* Rainfall totals of 3 to 6 inches are expected for the coast,
  Willapa Hills, Coast Range, Cascades, and Cascade foothills.
  Meanwhile, 1.5 to 2.5 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.


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

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.




Special Weather Statement

Special Weather Statement
National Weather Service Portland OR
432 AM PST Sun Dec 16 2018

North Oregon Coast-Central Oregon Coast-
Coast Range of Northwest Oregon-
Central Coast Range of Western Oregon-Lower Columbia-
Greater Portland Metro Area-Central Willamette Valley-
South Willamette Valley-Northern Oregon Cascade Foothills-
Northern Oregon Cascades-Cascade Foothills in Lane County-
Cascades in Lane County-Upper Hood River Valley-
Western Columbia River Gorge-Central Columbia River Gorge-
South Washington Cascades-Willapa Hills-South Washington Coast-I-
5 Corridor in Cowlitz County-Greater Vancouver Area-
South Washington Cascade Foothills-
Including the cities of Astoria, Cannon Beach, Tillamook,
Netarts, Pacific City, Lincoln City, Newport, Cape Foulweather,
Yachats, Florence, Vernonia, Jewell, Sunset Summit, Lees Camp,
Trask, Grande Ronde, Burnt Woods, Tidewater, Swisshome, Veneta,
St. Helens, Clatskanie, Hillsboro, Portland, Wilsonville,
Oregon City, Gresham, Troutdale, Salem, McMinnville, Woodburn,
Stayton, Dallas, Eugene, Springfield, Corvallis, Albany, Lebanon,
Sandy, Estacada, Silver Falls State Park, Sweet Home,
Government Camp, Detroit, Santiam Pass, Vida, Jasper, Lowell,
Cottage Grove, McKenzie Pass, McKenzie Bridge, Oakridge,
Willamette Pass, Parkdale, Odell, Corbett, Rooster Rock,
Multnomah Falls, Cascade Locks, Hood River,
Coldwater Ridge Visitors Center, Mount St. Helens,
Wind River Valley, Willapa, Frances, Elk Mountain, Ryderwood,
Raymond, Long Beach, Ocean Park, Naselle, Cathlamet,
Cape Disappointment, Longview, Kelso, Castle Rock, Vancouver,
Battle Ground, Ridgefield, Washougal, Yacolt, Amboy, Toutle,
Ariel, Lake Merwin, Yale Lake, Cougar, North Bonneville,
Stevenson, Carson, and Underwood
432 AM PST Sun Dec 16 2018


The strongest storm so far this season appears likely to impact
southwest Washington and northwest Oregon late Monday into
Tuesday, bringing heavy rain and gusty winds to the region.

Strong south winds are expected to develop along the coast
Monday, then spread inland Monday night and Tuesday. Winds strong
enough to down trees and power lines are expected along the coast
and in higher elevations of the Coast Range.

There is also the potential that strong winds will affect the
inland valleys, particularly the Willamette Valley. Details
remain uncertain, but at this point it appears central and
southern portions of the Willamette Valley have the better chance
to experience winds strong enough to cause damage to trees and
power lines.

The combination of heavy rain and strong winds may make travel
difficult across the region Monday night and early Tuesday. Stay
tuned to weather.gov/portland, NOAA weather radio, or your
favorite source of weather information for the latest updates on
this evolving weather situation.




Hydrologic Outlook

Hydrologic Outlook

Hydrologic Outlook
National Weather Service Portland OR
302 PM PST Sat Dec 15 2018


A weather system early next week is expected to bring heavy rain
to the Pacific Northwest. Details are beginning to become more
clear, with the potential for 2 to 5 inches of rain to fall across
Northwest Oregon and Southwest Washington Monday afternoon
through Tuesday, with heaviest amounts in the Willapa Hills, the
North Oregon Coast Range, and the west slopes of the Cascades.
Sharp rises are likely on rivers draining these areas, and
flooding is possible Tuesday and Wednesday.

Confidence in the precise timing and location of the heaviest
rain for this storm remains moderate, and slight changes to the
forecast should be expected and monitored over the next several
days. If conditions warrant, watches or warnings for specific
areas or rivers will be issued.

If you live in or near a flood-prone location, this is a good
time to review your preparations and action plans should flooding
develop next week. Monitor weather and river forecasts closely at
weather.gov/portland or mobile.weather.gov.

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