CW3E AR Update: 17 December 2019 Outlook

December 17, 2019

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A landfalling AR will bring heavy rainfall and mountain snowfall to the Pacific Northwest this week

• A landfalling AR is forecast to impact Northern CA, OR, and WA during 18–21 Dec
• Some areas along the Oregon Coast may experience AR conditions for more than 48 hours
• At least 3-7 inches of rainfall is expected over the Oregon Coast Ranges, Olympic Mountains, and Cascade Mountains over the next 5 days, with more than 1 foot of snow possible in the North Cascades

Click IVT or IWV image to see loop of GFS analyses/forecasts Valid 1200 UTC 17 December – 1200 UTC 23 December 2019

Summary provided by C. Castellano, B.Kawzenuk, F. M. Ralph; 17 December 2019