CW3E AR Update: 4 February 2020 Outlook

February 4, 2020

Click here for a pdf of this information.

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

  • A landfalling AR is forecast to impact British Columbia, Washington, and Oregon this week
  • Some areas along the Washington and Oregon coast may experience AR conditions for more than 48 hours
  • Prolonged inland penetration of AR conditions is likely over the Intermountain West
  • At least 2–7 inches of precipitation are expected over portions of western Washington and northwestern Oregon during the next 3 days, with at least 12” of snowfall in the North Cascades and portions of the Intermountain West
  • River flooding is possible once again downstream of the Washington Cascades
  • Landfalling AR activity beyond Day 4 (8 Feb) is unlikely as surface high pressure builds over the Northeast Pacific Ocean

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

Valid 0000 UTC 4 February – 0000 UTC 8 February 2020







Summary provided by C. Castellano, B. Kawzenuk, and F. M. Ralph; 4 February 2020