Weather Outlook

30-Day Weather Outlook for January 2, 2018, to February 2, 2018

  • Jan 03, 2018

Summary- The MJO Cycle is transitioning to a lower activity level. As this occurs, there will be support for more upper high pressure near the coast and into central California. Support continues in the mid-latitude sea surface temperature anomaly (SSTA) field west of California for troughing west of California and extending NE into the Oregon-Washington coast.

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30-Day Weather Outlook for December 27, 2017, to January 27, 2018

  • Dec 27, 2017

Summary- The MJO Cycle continues active, but appears, to be transitioning to less activity. As this occurs, there will be support for more upper high pressure near the coast of California. Support continues in the mid-latitude sea surface temperature anomaly (SSTA) field west of California for troughing near the coast of Oregon and N California.

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30-Day Weather Outlook for December 19, 2017, to January 18, 2018

  • Dec 19, 2017

This is a short briefing in lieu of the longer discussion that is normally issued for this outlook. Summary – Dec. 19 – Jan 18, 2018… Although support for blocking upper high pressure is less now than previously, La Niña continues in place, and will continue to oppose development of the normally occurring subtropical westerlies through the end of Dec and into January.

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30-Day Weather Outlook for December 11, 2017, to January 11, 2018

  • Dec 12, 2017

Summary- The MJO Cycle has been in an active state for about a week. GFS model solutions are suggesting support for more energetic sub-tropical westerlies around 30N, coming into S California. However, the active phase of the MJO cycle appears near maximum on Dec 11, and some transition to less activity and energy into the subtropical westerlies appears to begin after the 17th.

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30-Day Weather Outlook for December 4, 2017, to January 4, 2018

  • Dec 05, 2017

Summary- The MJO Cycle has been in an inactive state, but is progressing in a more active state during Dec 5-12th. This may facilitate slightly more active subtropical westerlies developing towards central California, but this is not confirmed by current model guidance. Support continues in the sea surface temperature anomaly (SSTA) field for troughing well to the west of California, centered...

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30-Day Weather Outlook for November 27, 2017, to December 27, 2017

  • Nov 28, 2017

Summary- The MJO Cycle supports an inactive phase for the westerly storm track that normally traverses California in Dec. The Cycle and overall pattern have settled into a currently stable state with little overall change. Support continues in the sea surface temperature anomaly (SSTA) field for troughing well to the west of California, centered about 140-150W. This maintains a dry and warmer...

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