Posted by: Richard | December 7, 2014

San Francisco Bay Area and Northern and Central California Forecast Discussion-09/19/2017 – 6:00AM PST

Short Term Weather 1 to 7 day Forecast Discussion  The jet stream has strengthened across the Northeast Pacific into the Pacific Northwest coast with rain showers spreading south to the far north coast of Calfornia that will continue through midweek and a slight chance of showers south into the far north bay on Wednesday, otherwise mostly fair and breezy weather will hold over Central California through much of the work week.  A trough will deepen over California on Wednesday bringing cooler and breezy conditions with temperatures only into the 70’s in the far inland valleys and showers over the mountains through Thursday. High pressure will build again late in the week over California for warmer weather over the weekend into early next week.

Northern and Central California 8 to 15 day extended forecast  High pressure will develop off the coast of California with mostly west to northwest winds aloft keeping California mostly fair with patchy low clouds spreading into coastal areas at times during the period.  A weak trough will develop off the south coast late in the period increasing the marine layer along the coast into coastal valleys and giving Southern California a chance of showers, especially over the Sierras. Temperatures will turn cooler.

Northern and Central California 16 to 20 day extended forecast  Computer models are suggesting an upper level low will move through Central and Southern California with a slight chance of showers over the Sierras early in the period. Temperatures will average slightly below normal during the period then turn a little warmer as higher pressures build in ahead of a deep trough in the Central Pacific.



  1. Hi Richard. I have tried to subscribe to your blog and it tells me that I’m already subscribed but I am not receiving anything from you. I’ve checked my spam folder but nothing is appearing there either. Any ideas?

    Also, I’m wondering if you could give me any idea of how El Nino will be affecting Baja California this January? My family is contemplating a trip there in early January and I’m worried about the possibility of heavy rains. I’ve searched for weather models on-line but haven’t been able to find something for that area.
    Thanks much!

    • Hi Susan, I am not sure how to subscribe to my blog,,,,are you wanting notifications. I just assumed people will do what I do which is to bookmark the site and look at it whenever you want. As for January weather in Baja, it would be impossible to get a forecast that far out in time and it is still to early to use El Nino or La Nina to help you as we are not sure which will be true at this point. Generally, Baja weather is similar to San Diego weather which is impacted by the jet stream over California. If you want dependable weather in Mexico in Janary, go further south into Mexico like Puerto Villarta or Cancun and the Yukatan Peninsula where the northern jet stream has not effect. PV is a great city.

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    • Thanks for your comment. Where are you located? This coming week will be quite interesting for the Bay Area as the jet stream will be aimed at Central California and the Sierras which could add quite a bit of snow pack that is much needed to completely end our drought. The idea of notifications is an interesting idea, but I often revise the forecast several times per day. You may not be interested in minor forecast changes.


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