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 possible.
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.