CW3E AR Update: 9 March 2020 Outlook

March 9, 2020

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A cutoff low and landfalling AR will bring moderate-to-heavy rainfall to portions of the southwestern U.S.

  • The interaction between a cutoff low off the California coast and tropical moisture over the Eastern Pacific will result in a landfalling atmospheric river (AR) over Baja California, Southern California, and Southern Arizona
  • Some areas in southern Arizona may experience 48 hours of AR conditions
  • The highest precipitation amounts (1–3 inches) are expected in Southern California and the Lower Colorado River Basin
  • More than 3 inches of precipitation are possible over the Transverse Ranges, Peninsular Ranges, and higher terrain in central Arizona

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

Valid 0000 UTC 9 March – 0000 UTC 14 March 2020













Summary provided by C. Castellano, C. Hecht, F. M. Ralph, and A. Wilson; 9 March 2020

*Outlook products are considered experimental