FXUS66 KMTR 042349 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 349 PM PST Thu Dec 4 2025 ...New AVIATION, MARINE... .KEY MESSAGES... Updated at 1139 AM PST Thu Dec 4 2025 - Persistent forecast through the next seven days with benign conditions and no precipitation expected - Hazardous cold conditions continue in the interior Central Coast Friday morning - Impacts from Tule Fog continue in the interior East Bay && .SHORT TERM... Issued at 1139 AM PST Thu Dec 4 2025 (This afternoon through Friday) Satellite imagery shows lingering stratus in the interior East Bay, an outgrowth of the Tule Fog across the Central Valley, and the very southern portion of the Salinas Valley. Isolated patches of higher clouds are scattered across the region. The general weather pattern continues to be dominated by ridging in the eastern Pacific, which has been edging into the western United States after a trough pulled away into the Central United States. The large scale flow continues to come from the north, and generally mild offshore flow persists across the higher elevations of the Bay Area, although as the offshore gradient begins to significantly weaken, the offshore flow will likewise decrease. Expect another round of Tule Fog impacts tonight into Friday morning, mainly across the interior Bay Area with potential impacts in the North Bay valleys. Highs today range from the upper 50s to the middle 60s across the lower elevations, except in the interior East Bay where highs remain in the lower 50s. A Cold Weather Advisory remains in effect for the interior Central Coast, including the southern Salinas Valley, for the midnight to 8 AM timeframe on Friday morning, as lows reach the lower to middle 30s generally and down into the 20s for isolated locations in the higher elevations. Elsewhere, lows range from the lower to middle 40s in the lower elevations, reaching into the upper 40s in the higher elevations. Temperatures in the interior East Bay are expected to warm slightly tomorrow into the lower 60s, while the rest of the region sees highs around 1 to 2 degrees warmer than today's. && .LONG TERM... Issued at 1139 AM PST Thu Dec 4 2025 (Friday night through next Wednesday) The forecast conditions remain so stable that a lot of my discussion from yesterday still applies. We are still expecting the ridging to build into the southwestern US, promoting a gradual warming trend through the early part of next week with the inland valleys reaching the upper 60s to middle 70s. We are still expecting a couple of storm systems to get deflected into the Pacific Northwest and leave us with offshore showers, potential light drizzle in the Sonoma coastal ranges, and disappointment for fans of wet weather everywhere else. We are still seeing the next chance for widespread rain towards the middle of the month with very high levels of uncertainty for that part of the forecast. && .AVIATION... (00Z TAFS) Issued at 349 PM PST Thu Dec 4 2025 VFR everywhere except STS and LVK. Guidance is showing some potential for fog to develop across the interior East Bay Valleys and North Bay Valleys tonight. For STS, fog chances increase after 12-14Z. Confidence wasn't high enough to put dense fog just yet but added in visibilities trending lower to around 3SM around 14Z. For LVK, leaned more towards lower visibilities around 3SM impacting LVK overnight with guidance not showing visibilities below 3SM at the airport. Winds are generally light and offshore but there may be another round of breezy offshore winds during the morning hours again along the coast. Moderate confidence that we will see all sites switch back to onshore by tomorrow afternoon as the the SFO- WMC gradient becomes positive again and strengthens. Vicinity of SFO...VFR through the TAF period. A weak sea breeze may develop late this afternoon/evening before light offshore flow returns overnight. Confidence is higher that we'll return to our more typical moderate afternoon sea breeze pattern by tomorrow afternoon as the SFO-WMC gradient strengthens and becomes positive again. SFO Bridge Approach...Similar to SFO. Monterey Bay Terminals...VFR. Winds generally remain light through the TAF period. Winds generally stay onshore during the day before becoming lightly offshore overnight. Drainage winds out of the SE are expected at SNS with winds peaking around 10-12 knots tomorrow morning. && .MARINE... (Tonight through next Tuesday) Issued at 349 PM PST Thu Dec 4 2025 A light to moderate northerly breeze will persist over the coastal waters through Thursday night with generally low seas. Winds will increase on Friday with strong gusts in the offshore and the northern most nearshore waters along with building seas up to 8 feet by Friday night. Breezy and at times gusty winds will prevail into next week. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...Coastal Flood Advisory until 3 PM PST Sunday for CAZ006-506-508- 529-530. Cold Weather Advisory until 8 AM PST Friday for CAZ516-518. PZ...Small Craft Advisory from 9 AM Friday to 3 AM PST Saturday for Pt Arena to Pt Reyes 0-10 nm. Small Craft Advisory from 9 PM this evening to 3 AM PST Saturday for Pt Arena to Pt Reyes 10-60 NM. Small Craft Advisory from 3 AM Friday to 3 AM PST Saturday for Pigeon Pt to Pt Pinos 10-60 NM. && $$ SHORT TERM...DialH LONG TERM....DialH AVIATION...Kennedy MARINE...RGass Visit us at www.weather.gov/sanfrancisco Follow us on Facebook, X, and YouTube at: www.facebook.com/nwsbayarea x.com/nwsbayarea www.youtube.com/nwsbayarea