Flood Watch issued December 18 at 2:42AM PST until December 20 at 4:00PM PST by NWS Portland OR
Issue date: 2025-12-18T10:42+00:00
* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...Northwest Oregon and southwest Washington including the following counties. In Oregon: Benton, Clackamas, Clatsop, Columbia, Hood River, Lane, Linn, Lincoln, Marion, Multnomah, Polk, Tillamook, Washington, and Yamhill. In Washington: Clark, Cowlitz, Pacific, Skamania, and Wahkiakum. * 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
Wind Advisory issued December 17 at 8:37PM PST until December 18 at 7:00PM PST by NWS Portland OR
Issue date: 2025-12-18T04:37+00:00
* WHAT...South winds 15 to 20 mph with gusts up to 45 mph expected. * WHERE...Greater Portland/Vancouver Metro, Willapa Hills and Adjacent River Valleys of Pacific and Wahkiakum Counties, Lower Columbia River and Cowlitz River Valleys, North Oregon Coast Range Lowlands, North Oregon Coast Range, and South Washington Cascade Foothills. * WHEN...From 8 AM to 7 PM PST Thursday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.
Flood Warning issued December 17 at 4:53PM PST until December 20 at 9:03AM PST by NWS Portland OR
Issue date: 2025-12-18T00:53+00:00
...The National Weather Service in Portland OR has issued a Flood Warning for the following rivers in Oregon... Clackamas River near Oregon City affecting Clackamas County. ...Forecast flooding changed from Minor to Moderate severity and increased in duration for the following rivers in Oregon... Siletz River at Siletz affecting Lincoln County. * WHAT...Moderate flooding is forecast. The current forecast is the largest flood on this river since the January 2009 flood event. * WHERE...Clackamas River near Oregon City. * WHEN...From Thursday evening to late Saturday morning. * IMPACTS...Above 46.0 feet, expect major flooding of some residences and buildings along the lower Clackamas River, including the mobile home park just downstream of Carver Bridge. * ADDITIONAL DETAILS... - At 4:00 PM PST Wednesday the stage was 29.9 feet. - Bankfull stage is 38.0 feet. - Forecast...The river will rise above flood stage late Thursday evening and crest around 45.3 feet late Friday morning. It will fall below flood stage early Saturday morning. - Flood stage is 39.0 feet. - http://www.weather.gov/safety/flood
Flood Warning issued December 17 at 4:25PM PST until December 19 at 5:14PM PST by NWS Portland OR
Issue date: 2025-12-18T00:25+00:00
...The National Weather Service in Portland OR has issued a Flood Warning for the following rivers in Oregon... Sandy River near Bull Run affecting Clackamas and Multnomah Counties. Trask River near Tillamook affecting Tillamook County. Hood River Near Hood River affecting Hood River County. Molalla River near Canby affecting Clackamas County. * WHAT...Moderate flooding is forecast. The current river forecast is about 6 inches shy of the January 2011 flood event. * WHERE...Sandy River near Bull Run. * WHEN...From Thursday evening to Friday afternoon. * IMPACTS...Above 21.5 feet, expect significant bank erosion, large amounts of debris in the river, and flooding of low areas along the river, especially in the lower reach of the Sandy near Troutdale. * ADDITIONAL DETAILS... - At 3:45 PM PST Wednesday the stage was 13.0 feet. - Bankfull stage is 18.0 feet. - Forecast...The river will rise above flood stage Thursday evening and crest around 21.2 feet early Friday morning. It will fall below flood stage late Friday morning. - Flood stage is 19.3 feet. - http://www.weather.gov/safety/flood
Winter Weather Advisory issued December 17 at 10:44AM PST until December 18 at 10:00AM PST by NWS Portland OR
Issue date: 2025-12-17T18:44+00:00
* WHAT...Wet snow expected. Total snow accumulations up to 6 inches. Winds gusting as high as 40 mph. * WHERE...North Oregon Cascades and Cascades of Marion and Linn Counties. * WHEN...From 4 AM to 10 AM PST Thursday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous.
