CW3E AR Update: 5 November 2020 Outlook

November 5, 2020

Click here for a pdf of this information.

First significant precipitation event of the season likely in California and the Four Corners Region

  • A shortwave trough and an associated AR are forecast to bring significant precipitation to portions of California and the Four Corners Region over the next several days
  • AR 2/AR 3 conditions (based on the Ralph et al. 2019 AR Scale) are possible in south-central Arizona
  • The highest precipitation amounts (1–3 inches) are forecast over far northern California, the Sierra Nevada, coastal Southern California, and across the higher terrain in central Arizona, Utah, and western Colorado
  • Significant snowfall is also possible in the Sierra Nevada and San Juan Mountains

Click images to see loops of GFS 500-hPa Absolute Vorticity & IVT forecasts

Valid 1200 UTC 5 November – 1200 UTC 9 November 2020









Summary provided by C. Castellano, C. Hecht, J. Kalansky, B. Kawzenuk, and F. M. Ralph; 5 November 2020

*Outlook products are considered experimental