CW3E AR Update: 20 November 2017 Outlook and Summary

November 20, 2017

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A Potentially Extreme and Persistent AR is forecast to Impact the Pacific Northwest

  • A potentially extreme AR is forecast to impact the Pacific Northwest over the next 4 days
  • AR conditions could last over 50 hours in portions of Oregon and Northern California
  • As much as 15 inches of precipitation is forecast to fall over the Olympic Mountains over the next 5 days
  • Several rivers in Washington are currently forecast to rise above flood stage

Click IVT or IWV image to see loop of 0-180 hour GFS forecast

Valid 1200 UTC 20 November – 0000 UTC 28 November 2017







Summary provided by C. Hecht, B. Kawzenuk, J. Kalansky, and F.M. Ralph; 1 PM PT Friday 20 November 2017

*Outlook products are considered experimental