CW3E AR Update: 7 October 2021 Outlook

October 7, 2021

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Atmospheric River to Bring Rain to Southern California and Interior Southwestern U.S.

  • An atmospheric river (AR) is forecasted to make landfall across Southern California today
  • AR 2 conditions are forecasted in coastal San Diego County, with maximum IVT values > 500 kg m-1 s-1
  • AR 2 conditions are also possible over portions of the interior southwestern U.S. due to substantial inland penetration of this AR
  • The heaviest precipitation (0.5–1.5 inches) associated with this AR is expected over the Peninsular and eastern Transverse Ranges in Southern California and the higher terrain in southwestern Utah, northern Utah, and southeastern Idaho

Click images to see loops of GFS IVT & IWV forecasts

Valid 0600 UTC 7 October – 0000 UTC 10 October 2021





Summary provided by C. Castellano, B. Kawzenuk, J. Kalansky, and F. M. Ralph; 7 October 2021

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*Outlook products are considered experimental