CW3E AR Update: 4 January Outlook

January 4, 2019

Click here for a pdf of this information.

Multiple ARs forecast impact the US West Coast over the next several days

  • An AR is currently impacting the Pacific Northwest, bringing heavy rain and strong winds
  • As much as 5 inches of precipitation has fallen over portions of the Pacific Northwest over the past 24 hours
  • Another system is forecast to develop along the cold front of the current AR, which will make landfall over Northern CA
  • As much as 9 inches of precipitation is forecast to fall over the higher elevations of Northern CA over the next 6 days
  • Forecast confidence in onset, duration, and magnitude of additional ARs (days 3+) is currently low

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

Valid 1200 UTC 4 January – 0000 UTC 12 January 2019






Summary provided by C. Hecht, B. Kawzenuk, and F. M. Ralph; 1 PM PT 4 January 2019