CW3E AR Update: 29 January 2020 Outlook

January 29, 2020

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A landfalling AR will bring heavy rainfall and the potential for flooding to the Pacific Northwest

  • A landfalling AR is forecast to impact British Columbia, Washington, and Oregon this week
  • Some areas along the coast may experience AR3/AR4 conditions, but there is significant uncertainty in forecast AR Scale
  • At least 3–7 inches of rainfall are expected over portions of western WA and OR during the next 5 days, with more than 7 inches possible over the Olympic Peninsula and North Cascades
  • Surface high pressure will build over the Northeast Pacific Ocean during 1–3 Feb
  • Additional landfalling AR activity is currently forecast on the poleward side of the surface high between 4 Feb and 7 Feb

Click IVT or IWV image to see loop of GFS analyses/forecasts

Valid 0000 UTC 29 January – 0000 UTC 3 February 2020






Summary provided by C. Castellano, C. Hecht, B. Kawzenuk, and F. M. Ralph; 29 January 2020