Late January Outlook: Southern California, Pacific Northwest, East Coast

  • Southern California - After an extended period of warm and dry weather, the second half of January will feature some cooler weather mixed with seasonably mild conditions. An occasional chance for a shower will pop up, but it will remain drier than average.
  • Northern California - Finally some rain! This is great news for everyone in NorCal and the Pacific Northwest. There will be a parade of storm systems bringing periods of heavy rain for the last half of this month.
  • East Coast - Mild weather will continue with a few chances for rain, which is always good news. However, it's bad news for snow lovers. Things could briefly change for early February, but don't hold your breath!
My technical discussion is embedded within the maps below (ECMWF ensemble 500 mb heights/anomalies). Be sure to click the images to enlarge so that you can read the text. Enjoy!

Mid January Outlook for Southern California

I recently sent out a Twitter update about this - the weather pattern is about to shift. The impacts will be minimal in Southern California, though the record-breaking heat will not return for the rest of the month. Instead, San Diego and surrounding areas will remain dry and seasonably mild through at least January 25.

However, the Pacific Northwest and Eastern U.S. will see some big changes. A persistent ridge (highlighted below) has been the dominant feature over the past three weeks for San Diego and all of California. This has kept the entire state hot and extremely dry.