CW3E AR Update: 10 December 2019 Outlook

December 10, 2019

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An Atmospheric River is Forecast to Make Landfall over Southern Oregon and Northern California Tomorrow, 11 Dec. 2019

  • An AR is currently forecast to bring AR1/AR2 conditions to coastal locations from North/Central CA to WA
  • The potential development of a MFW is introducing large forecast uncertainty in the overall duration of AR conditions over Southern OR and Northern CA
  • Several high elevation locations from Northern CA to WA could receive >2 inches of precipitation in association with this event

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

Valid 1200 UTC 10 December – 0000 UTC 18 December 2019


CW3E West-WRF Forecast Products




NOAA Weather Prediction Center Forecasts


NOAA Weather Prediction Center Forecasts

Summary provided by C. Hecht, C. Castellano, B.Kawzenuk, F. M. Ralph; 3 PM PT 10 December 2019