The National Weather Service in Portland has issued a Flood Watch 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, and South Willamette Valley. In Southwest Washington, Greater Vancouver Area and I-5 Corridor in Cowlitz County from 7 PM PST this evening through late Tuesday night.
Heavy rain at low elevations Monday night and Tuesday may cause ponding in roadway low areas and flooding along small streams. Rainfall totals for low elevations are forecast to be 1 to 4 inches. Minor flooding along a few rivers and creeks in the Willamette Valley and Portland metro area is possible Tuesday and Tuesday night.
Rivers of greatest concern include the Marys in Benton County, the Luckiamute in Polk and Benton counties, and Johnson Creek in Multnomah and Clackamas County. As of Monday morning, only minor flooding is predicted.
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.
Winter Storm Watch for Portland and Vancouver Area
A winter storm watch remains in effect through this afternoon in the greater Portland and Vancouver metro area and the western Columbia River Gorge. Heavy snow is possible. Total snow accumulations of up to six inches possible, most likely in the hills above 500 feet…but possibly lower especially in the north.