CW3E AR Update: 9 October 2020 Outlook
October 9, 2020
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Update on Atmospheric Rivers Forecast to Impact the Northwestern US
- Multiple landfalling ARs are forecast to bring significant precipitation to the northwestern US during the next 7 days
- Current forecasts suggest that AR 3/AR 4 conditions (based on the Ralph et al. 2019 AR Scale) are possible over coastal Oregon and Washington in association with the first and third ARs
- Inland penetration of these ARs may also produce AR 2/AR 3 conditions over portions of interior Oregon and Washington
- 7-day total precipitation is forecast to exceed 7 inches over the Olympic Mountains and North Cascades, with more than 3 inches of precipitation possible over the Northern Rockies
Click images to see loops of GFS IVT/IWV analyses and forecasts Valid 1200 UTC 9 October – 1200 UTC 17 October 2020 |
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Summary provided by C. Castellano, J. Kalansky, B. Kawzenuk, and F. M. Ralph; 9 October 2020
*Outlook products are considered experimental