Rob Mayeda NBC Bay Area

A small bay beach covered by water

Keller (no) Beach, Richmond. #KingTides

I’m sure USGS is reviewing it… In retrospect, if you looked at the shaking intensity map near the epicenter, and there weren’t any reports of even moderate or any shaking intensity that was a clear sign of a false alert… The DYFI map.

The 5.9 that wasn’t

And it’s been deleted apparently it was not an actual event? 🤔

It appears to have been a fake alert … therefore it makes sense. Many questions if it was meant to be a test that unfortunately went live to their site

The regional snowpack updates are moving again… although for more detailed for forensic data I would go with CSSL Berkeley

Overall, water resources are looking strong to start December with all of CA major reservoirs at more than 100% of historical averages. And while frozen precip is lacking so far compared to last year, combined rain and snow has been above average including across the Central Sierra. 12/2/2025 #CAwx

Still looks like we will have a “Winds-day” ahead especially for the mountains starting Tuesday night, with peak breezy conditions into Wednesday morning. This dry offshore wind pattern should also help to keep fog away but we may see it return this weekend as high-pressure builds back. 12/2/2025

Sierra snowpack by region:
North: 18% (one year ago 248%)
Central: 31% (109%)
South: 83% (183%)
Fall storms have been warmer which is reflected in the low vs. average snowpack numbers to start December. Snow lagging at @UCB_CSSL but overall precip (rain+snow) is above average (warmer storms).

3.1 earthquake follows the 2.2 and 3.3 in the same general area near Kenwood 12/1/2025 @nbcbayarea

Preliminary magnitude 3.3 earthquake near Santa Rosa at 10:56 pm, it appears we had a 2.2 as well shortly after @nbcbayarea 11/30/2025

Here’s the Sunday satellite view with high level cirrus clouds moving south above an extensive deck of low clouds/fog, that looks like white paint filling in the entire Central Valley 11/30/2025 @NBC Bay Area #BayArea #CentralValley #Fog

Here’s the Sunday satellite view with high level cirrus clouds moving south above an extensive deck of low clouds/fog, that looks like white paint filling in the entire Central Valley 11/30/2025 @NBC Bay Area #BayArea #CentralValley #Fog

Fog feedback loop: resilient high pressure is leading to relentless fog. The cumulative effect of high pressure trapping air pollution below has our foggy pattern locked in for now, but we may catch a midweek break as offshore wind increases. @nbcbayarea #CAwx 11/30/2025

Gusty offshore wind potential Tuesday night and Wednesday will help.. although we might get some wind advisories for the hills. But I think that has a chance of clearing things out a bit.

We're still in the first quarter of our rain/snow season... but that big early lead we built is starting to fade away, as we head into the second week of dry weather. High pressure not only has helped to keep the storms away, but also helped to lock in our foggy pattern of late. 11/30/2025

When the sunset across the Bay Area looks more like Tatooine (minus one Sun). High pressure & warmer air above acting like lid, trapping smoke / dust pollution. Also makes for a positive feedback loop for fog forming (act as tiny surfaces for water droplet formation) #weatherbasedStarWarsReferences

If you’ve been watching the college games near the Great Lakes today, then you know the 49ers road game outlook in Cleveland tomorrow looks very… wind chilled. @49ers #FTTB

Saturday fog/temp check: still foggy inland and still cool temps with hazy sunshine away from the inland low clouds. #CAwx 11/29/2025

More shaking, preliminary magnitude 3.2 earthquake near Colma, west of South San Francisco at 5:03 pm 11/28/2025 @nbcbayarea

‪Foggy air-conditioning remains undefeated. Yet another day of 40s and low 50s highs inland across the North Bay and East Bay valleys through the delta into Sacramento and the Central Valley. 11/28/2025 #CAwx‬

The weather equivalent of leftovers… lingering low clouds and fog-cooled temperatures will continue as we wrap up the holiday weekend. Meanwhile, holiday travel around the Great Lakes could get challenging, including a windy and cold outlook for the 49ers game 🥶 11/28/2025

Tis the season for fog-chilled temps. Condensation at ground level is easy to spot (dew, drops on cars etc) higher up particulates like smoke boost fog formation. High pressure (traps pollution) can sustain these conditions until we see more wind or storms return 11/27/2025 #CAwx

Easily… if you have access to the HRRR, that model typically does best for low cloud cover and fog influenced temperatures this time of year.

Bay Area fog machine: why your weather apps saying highs in the 60s and 70s for the valleys on Thanksgiving are off the mark. Light offshore breeze maintains the import of Central Valley fog keeping North Bay and East Bay valleys and inner bay temps mired in the 40s and 50s. #CAwx 11/27/2025

Series of earthquakes during the 12pm hour just south of San Juan Bautista. Light shaking intensity reported near Gilroy as weak shaking noted far north as San Jose, west to Monterey/Santa Cruz. 4.0, 3.9 and 2.7. @nbcbayarea 11/27/2025 #CAwx

We need more wind as long as persistent high pressure lingers conditions remain mostly unchanged.. hopefully some improvement into the weekend

Fog still looks to be the main impact on holiday travel plans locally… things get a little more interesting by the weekend with the potential for cooling, gusty wind and showers, stay tuned 11/23/2025

Also into fog-chilled day time highs season...inland East Bay and North Bay valleys are prone to this as fog lingers into the afternoon. Low 50s Napa, across inland Contra Costa County approaching 3pm. This pattern will likely stick around through Thanksgiving #CAwx 11/23/2025

While not officially into Winter quite yet, our winter mode for fog is underway. Recent rain, clearing skies, light wind are perfect for Central Valley fog and we’ll see dense fog advisories to wrap up the weekend. Things could take a chilly turn toward the end of next week, stay tuned. 11/22/2025