CW3E AR Update: 11 March 2020 Outlook

March 11, 2020

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A cutoff low and landfalling AR will bring heavy rainfall to the Desert Southwest

  • A cutoff low that has been impacting California since Monday will strengthen and interact with a remnant atmospheric river (AR) over the Baja Peninsula
  • This interaction will result in heavy rainfall across Southern California, southern Nevada, and west-central Arizona
  • Some areas in southern Arizona may experience another round of AR1 conditions
  • An additional 3+ inches of precipitation are possible over the eastern Transverse Ranges
  • Portions of the Sonoran and Mojave Deserts may receive 15–30% of average annual rainfall over the next 48 hours

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

Valid 1200 UTC 11 March – 1200 UTC 13 March 2020









Summary provided by C. Castellano and F. M. Ralph; 11 March 2020

*Outlook products are considered experimental