Issued at 849 PM PST Mon Dec 1 2025
Satellite imagery shows mostly clear skies across the region with lingering spillover from the Tule fog present in the far interior reaches of southeastern Santa Clara and eastern San Benito Counties. The North Bay is seeing wisps of high-level clouds, the forerunners of a stream of clouds moving southwards over southern Oregon and northern California. This feature will disrupt the radiational cooling expected tonight, the question is how much, and will it be enough to keep the Tule fog, in addition to patches of fog in the Bay Area valleys from forming tonight? The latest runs of the high resolution models suggest that it won't be enough with the fog returning to the interior Bay Area valleys through the night. Nevertheless, the night shift will monitor the developing situation overnight and assess the need for a Dense Fog Advisory as needed. No other changes to the forecast at this time.
DialH
, Issued at 145 PM PST Mon Dec 1 2025 (This evening through Tuesday)
Less cloudiness for most places today thanks to a weak upper level disturbance and a light push of offshore winds overnight. This helped dry the low-to-mid levels and provide enough mixing aloft to aid in a quicker clearing to clear skies today. Some areas still holding on to fog and low clouds in far eastern Contra Costa and Alameda counties bordering the central valley. We can expect this trend to continue into Tuesday with dryer and in place, resulting in temps a couple of degrees warmer than today.
..issued at 145 PM PST Mon Dec 1 2025 (Tuesday night through next Sunday)
By Tuesday night we'll start to see a deep upper low digging into the Great Basin in what appears as an inside slider. Surface high pressure building in northern NV in the wake of this system promotes a strong offshore oriented pressure gradient that will result in gusty offshore winds. Winds set to increase going into Tuesday night, increasing through early Wednesday morning and peaking sometime by noon Wednesday. We're anticipating NE winds 25-35 mph with potential gusts to 40 mph across the North Bay, East Bay Hill, and Santa Cruz Mtns. Some potential for isolated gusts to 50 mph along the higher ridgetops of the interior North Bay. Things will certainly dry out with this burst of offshore flow, but we aren't expecting RH to get below the 30-40% range for most. Isolated areas at highest elevations in the interior North Bay may see RH as low as 25-30% Wednesday. Despite the gusty and dry conditions, fuel moisture should mitigate most fire weather concerns thanks to productive rainfall in early November. Beyond the middle of the week, things look much quieter and a return to a benign pattern with the ridiculously resilient ridge (RRR) dominating through the weekend.
(06z TAFS) Issued at 942 PM PST Mon Dec 1 2025
Currently a mixed bag of MVFR-VFR at the terminals. Only high clouds in the sky, but visibilities are starting to drop at some terminals. Generally an optimistic persistence forecast on tap. High clouds and offshore flow should at least somewhat limit the extent in time and space of fog/stratus.
Vicinity of SFO, Currently VFR with easterly flow. Moderate to high confidence on VFR prevailing through the TAF period.
SFO Bridge Approach, Similar to SFO.
Monterey Bay Terminals, Currently VFR with easterly flow at MRY and VFR and calm at SNS. Moderate to high confidence on VFR prevailing through the TAF period at both terminals.
(tonight through next Sunday) Issued at 849 PM PST Mon Dec 1 2025
Hazardous marine conditions return Tuesday afternoon as northerly breezes increase to become fresh to strong and seas become rough to very rough. Gale force gusts are expected over the northern outer waters. Conditions improve Thursday with moderate northerly breezes and moderate seas. Locally strong winds and rough seas will remain possible over the far northwestern portion of the northern outer waters.
Issued at 1014 AM PST Mon Dec 1 2025
Hazardous beach conditions will continue into Wednesday evening with a very energetic surf zone. A beach hazards statement remains in effect for the coastline from Sonoma County to Monterey County through 10 PM PST Wednesday evening. Breaking waves 10 to 14 feet, with long lulls of 10 to 20 minutes or more between largest sets can be expected. Some of the favored break points may exceed 20 feet at times. Forerunners will be 18+ seconds with heights of 2-5 feet into tonight resulting in the greatest risk for sneaker waves. This combined with high astronomical tides in the morning hours will increase the aforementioned risk. Sneaker waves can unexpectedly run significantly farther up the beach than normal, including over rocks and jetties. Rip currents are typically more frequent and stronger in the vicinity of jetties, inlets, and piers.
RGass
Ca, Beach Hazards Statement through Wednesday evening for CAZ006-505- 509-529-530.
Coastal Flood Advisory from 6 AM Tuesday to 3 PM PST Sunday for CAZ006-506-508-529-530.
PZ, Small Craft Advisory from 3 PM Tuesday to 3 AM PST Wednesday for Pt Arena to Pt Reyes 0-10 nm.
Small Craft Advisory from 9 AM to 3 PM PST Tuesday for Pt Arena to Pt Reyes 10-60 NM.
Gale Warning from 3 PM Tuesday to 3 AM PST Wednesday for Pt Arena to Pt Reyes 10-60 NM.
Small Craft Advisory from 9 PM Tuesday to 3 AM PST Wednesday for Pigeon Pt to Pt Pinos 10-60 NM.
