FXUS66 KMTR 090159 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 559 PM PST Thu Jan 8 2026 ...New AVIATION... .KEY MESSAGES... Updated at 110 PM PST Thu Jan 8 2026 - High pressure building over the interior promoting cooler temperatures through this weekend - Hazardous beach conditions along Pacific Coast beaches through Friday and again early next week && .SHORT TERM... Issued at 110 PM PST Thu Jan 8 2026 (This evening through Friday) The radar has been placed back into "Clear Air Mode" and will likely remain this way for at least the next week, maybe even two. In the near term, high surface pressure building over the interior Western US in the wake of a cold front will promote light offshore flow across our region. This is similar to what we'd call an inside slider, but without the larger fire weather risks. This time, it's cold weather that is the main risk contributor. By this evening, we'll start to see winds veer to more of an E/NE direction. This will not only promote drying of the airmass, but also clearing of any lingering cloud cover going into tonight. In addition to long winter nights, this primes the situation for maximum nighttime radiational cooling. Forecast temperatures haven't really changed much from the previous issuances. Main difference today is that we've issued a Cold Weather Advisory for the interior East Bay, North Bay Valleys, South Bay, Santa Cruz Mtns, and the Monterey Bay region where temperatures will be in the mid-30s by sunrise Friday. Additionally, we've issued an Extreme Cold Warning for regions of the interior Central Coast including the southern Salinas Valley where temps will be in the mid-to-upper 20s by morning. && .LONG TERM... Issued at 110 PM PST Thu Jan 8 2026 (Friday night through next Wednesday) The aforementioned pattern persists into the weekend, warming slightly by Sunday morning. By Monday and Tuesday mornings, temps will be back into normal territory. Otherwise we have high confidence in dry weather persisting through the forecast period as a broad ridge of high pressure builds aloft. && .AVIATION... (00Z TAFS) Issued at 559 PM PST Thu Jan 8 2026 A 500 mb high pressure system will build over the forecast area with a surface offshore pressure gradient WMC-SFO also developing and strengthening tonight through Friday. Forecast is near high confidence VFR except a patch or two of valley fog /LIFR-IFR/ is possible late tonight and Friday morning. Forecast cross sections show increasing northeast winds to 30-40 knots over the East Bay and the North Bay hills and mountains tonight and Friday. Current observations show north to northeast wind gusts to 40 mph on Mt St Helena and Mt Umunhum. Amended KAPC TAF to add low level wind shear (LLWS) tonight; will monitor observations and amend TAFs for LLWS as needed tonight and Friday. Vicinity of SFO...VFR. Northwest wind with a few gusts to 20 knots during the evening, wind shifting to northeast near 5 knots tonight and continuing Friday. SFO Bridge Approach...Similar to SFO. Monterey Bay Terminals...VFR. Northwest winds 10 to 15 knots shifting to east to southeast 5 to 10 knots tonight and continuing through Friday mid to late afternoon. && .MARINE... (Tonight through next Tuesday) Issued at 355 PM PST Thu Jan 8 2026 Moderate to breezy winds are affecting the outer waters. A building northwesterly swell is arriving and is causing a rough sea state with shoaling near the coast, harbor entrances, and bars. Winds and seas will ease Friday into the weekend. && .BEACHES... Issued at 350 AM PST Thu Jan 8 2026 High Surf Advisory remains in effect through 10 pm Friday PST. Expect large breaking waves up to 22 feet, strong rip currents and sneaker waves from coastal Sonoma county to coastal Monterey county, excluding the northern Monterey Bay shoreline where a Beach Hazards Statement will be in effect. Large breaking waves can overpower swimmers resulting in significant physical injury and increase the risk of drowning. Beach Hazards Statement remains in effect through Friday evening for the northern Monterey Bay shoreline. Expect hazardous beach conditions with strong rip currents, sneaker waves, and breaking waves up to 15 feet. This will result in dangerous conditions along the shoreline. Stay off of jetties, piers, rocks, and other waterside infrastructure. Remain out of the water to avoid hazardous surf and NEVER turn your back on the ocean. Monitor local weather, surf and tide forecasts at www.weather.gov/mtr. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...High Surf Advisory until 10 PM PST Friday for CAZ006-505-509-530. Cold Weather Advisory from 1 AM to 9 AM PST Friday for CAZ502- 506-510-512-513-515-528>530. Extreme Cold Warning from 1 AM to 9 AM PST Friday for CAZ514- 516>518. Beach Hazards Statement through Friday evening for CAZ529. PZ...Small Craft Advisory until 9 PM PST this evening for Mry Bay. Small Craft Advisory until 3 AM PST Friday for Pigeon Pt to Pt Pinos 0-10 nm-Pt Arena to Pt Reyes 0-10 nm-Pt Pinos to Pt Piedras Blancas 0-10 nm-Pt Reyes to Pigeon Pt 0-10 nm. Small Craft Advisory until 3 PM PST Friday for Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 10-60 NM. && $$ SHORT TERM...Behringer LONG TERM....Behringer AVIATION...Canepa MARINE...Canepa 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