Weather Alerts for Willipa HillsIssued by the National Weather Service |
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| WILLIPA HILLS | ||
Areas Affected: Clatsop County Coast - Tillamook County Coast - Central Coast of Oregon - North Oregon Coast Range Lowlands - Central Oregon Coast Range Lowlands - North Oregon Coast Range - Central Oregon Coast Range - Lower Columbia River - Tualatin Valley - West Hills and Chehalem Mountains - Inner Portland Metro - East Portland Metro - Outer Southeast Portland Metro - West Central Willamette Valley - East Central Willamette Valley - Benton County Lowlands - Linn County Lowlands - Lane County Lowlands - West Columbia River Gorge of Oregon above 500 ft - West Columbia River Gorge I-84 Corridor - Upper Hood River Valley - Central Columbia River Gorge I-84 Corridor - Clackamas County Cascade Foothills - Cascade Foothills of Marion and Linn Counties - Lane County Cascade Foothills - North Oregon Cascades - Cascades of Marion and Linn Counties - Cascades of Lane County - South Washington Coast - Willapa and Wahkiakum Lowlands - Willapa Hills - Cowlitz County Lowlands - North Clark County Lowlands - Inner Vancouver Metro - East Clark County Lowlands - South Washington Cascade Foothills - West Columbia River Gorge - SR 14 - Central Columbia River Gorge - SR 14 - South Washington Cascades |
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| Effective: Fri, 12/5 3:57am | Updated: Fri, 12/5 4:36am | Urgency: Future |
| Expires: Fri, 12/5 4:00pm | Severity: Unknown | Certainty: Possible |
Details:
ESFPQR A series of frontal systems will keep conditions wet through the weekend and much of next week. The most notable period will be late Monday through late Wednesday, where a prolonged atmospheric river may bring significant rainfall and rising rivers across southwest Washington and northwest Oregon. Rivers draining the Coast Range and Willapa Hills have a 10-25% chance of reaching moderate flood stage and a 8-15% chance of reaching major flood stage. There is also the potential for flooding along small creeks and streams, as well as urban flooding. Flooding of the Willamette mainstem rivers is unlikely to occur (less than 10%). Probabilities for specific river points can be found at the National Water Prediction Service website. Periods of heavy rain will also increase the risk for landslides in areas of steep terrain, and debris flows over recently burned areas. |
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