CW3E AR Update: 30 October 2020 Outlook

October 30, 2020

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Active weather pattern to bring landfalling AR activity and precipitation to the Pacific Northwest

  • A series of storms is forecast to produce a prolonged period of AR conditions across portions of Oregon and Washington next week
  • 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
  • AR 2/AR 3 conditions are also possible over portions of interior Oregon and Washington
  • 7-day precipitation totals may exceed 5 inches in the Olympic Mountains and North Cascades

Click images to see loops of GFS IVT/IWV analyses and forecasts

Valid 1200 UTC 30 October – 1200 UTC 7 November 2020






Summary provided by C. Castellano, C. Hecht, J. Kalansky, and F. M. Ralph; 30 October 2020

*Outlook products are considered experimental