FXUS66 KMTR 271209 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 509 AM PDT Mon Oct 27 2025 ...New AVIATION, MARINE... .KEY MESSAGES... Updated at 1225 AM PDT Mon Oct 27 2025 - Pleasant weather this the week - Light offshore wind and low relative humidity Tue-Wed && .SHORT TERM... Issued at 1225 AM PDT Mon Oct 27 2025 (Today and tonight) The radar has been put back in clear air mode as the rain has ended across the cwa. Some patchy low clouds persist over the Bay Area, but they should clear by mid day as much drier air filters in. The SFO-WMC gradient was +6.7 mb at 26/06Z, and has dropped to +2.3 by 27/06Z. This gradient will flip negative and continue to drop through the day, eventually reaching -5 mb or so as high pressure builds over the northern Rockies, and a surface trough forms over California. This gradient will trigger some dry, offshore, N-NE winds that will persist for several days. The 850mb temperature is quickly rising, but is still below normal and the lingering clouds will keep temperatures mild today. && .LONG TERM... Issued at 1225 AM PDT Mon Oct 27 2025 (Tuesday through Sunday) Classic La Nina pattern this week with a few weak troughs moving across the Pacific Northwest, while a strong ridge persists over Southern California. The Bay Area will be influenced more by the ridging, but it won't be quite as hot as southern California. The warming and drying trend will continue into Tuesday with clear skies and continued offshore wind. Inland temperatures will climb into the upper 70s with the minimum RH dropping to 25-35%. The offshore wind will help push the warmer air all the way to the coast, where the temperature should climb to upper 60s to low 70s. The actual wind speed doesn't look very strong, helping keep fire weather concerns in check. Wednesday will be a few degrees warmer and currently looks like the warmest day of the week. Since temperatures are as much as 10-15 degrees higher than normal, we have some minor HeatRisk mid week. The offshore wind will likely ease or flip back onshore by Thursday, which could bring us some cloud cover, but still no chance of rain. Most ensemble members suggest ridging will continue until the middle of next week. && .AVIATION... (12Z TAFS) Issued at 508 AM PDT Mon Oct 27 2025 Light winds and MVFR CIGs are affecting all of the TAF sites. Cloud cover erodes through the mid to late morning with moderate winds building in time for the afternoon. Cloud cover fails to return into the night with light and variable winds expected in the evening through the rest of the TAF period. Vicinity of SFO...MVFR CIGs erode into the mid morning as moderate northerly winds arrive. Expect winds to turn more westerly into the late afternoon with gusts up to 22 kts. These winds turn late and variable into the night. SFO Bridge Approach...Similar to SFO. Monterey Bay Terminals...MVFR CIGS scatter and erode into the mid morning as moderate winds build. Expect northerly winds near SNS through the day, while MRY starts Northeast then turns northwest in the afternoon. Winds become light and variable into the late evening. && .MARINE... (Today through Saturday) Issued at 508 AM PDT Mon Oct 27 2025 Breezy to gusty winds will continue through the week with near- gale force gusts for the outer waters and coastal jet region of Point Sur. Seas abate through the morning abate becoming moderate through the forecast period. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...Small Craft Advisory until 9 AM PDT this morning for Pt Arena to Pt Reyes 0-10 nm. Small Craft Advisory until 3 AM PDT Tuesday for Pigeon Pt to Pt Pinos 0-10 nm-Pigeon Pt to Pt Pinos 10-60 NM-Pt Pinos to Pt Piedras Blancas 0-10 nm. Small Craft Advisory until 9 AM PDT Tuesday for Pt Arena to Pt Reyes 10-60 NM. Small Craft Advisory from 9 PM Tuesday to 3 AM PDT Wednesday for Pt Arena to Pt Reyes 10-60 NM. && $$ SHORT TERM...Flynn LONG TERM....Flynn AVIATION...Murdock MARINE...Murdock 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