A Pacific storm system will continue to bring low elevation rain and mountain snow to much of the West through Wednesday, with heavy mountain snow expected in the higher elevations of the Sierra Nevada. This system will also bring strong winds to the Intermountain West, Rockies, and Plains, which will create Critical fire weather conditions for the High Plains. Read More >
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514 FXUS66 KMTR 221135 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 435 AM PDT Wed Apr 22 2026 ...New AVIATION, MARINE... .KEY MESSAGES... Updated at 1004 PM PDT Tue Apr 21 2026 - Cool conditions Wednesday with lingering showers through the morning - Seasonal temperatures and dry conditions arrive Thursday - Monitoring potential rain and drizzle this weekend into the early part of next week && .SHORT TERM... Issued at 1004 PM PDT Tue Apr 21 2026 (Tonight through Thursday) It was a pretty active day on Tuesday with quite a bit of lightning reported across the Bay Area and Central Coast, and a funnel cloud reported near Fremont. The chances for convection have basically shut down as with the lack of solar heating, and while lingering isolated showers are possible through the rest of the morning, not expecting convection to be an issue through Wednesday. Beyond the lingering showers, skies will be generally clearing Wednesday morning with mostly sunny conditions and a gentle onshore breeze developing by the afternoon hours. Low temperatures this morning range from the upper 30s to the middle 40s in the inland valleys, to the upper 40s and lower 50s near the coast and the Bays. High temperatures on Wednesday are close to the upper 50s to the middle 60s in the lower elevations, with a slight warming gradient towards the inland valleys, and the upper 40s to middle 50s at the higher elevations. && .LONG TERM... Issued at 1004 PM PDT Tue Apr 21 2026 (Thursday night through next Tuesday) Temperatures will warm slightly for Thursday and Friday as a barely noticeable ridge sets up over the region, with highs in the lower elevations range from the lower 60s to lower 70s, close to or slightly below the seasonal averages. Into the weekend, another trough will come into the region and cause temperatures to dip again, introducing slight chances for light rain and drizzle that are expected to continue through the middle of next week. The latest CPC outlook leans towards precipitation totals above the seasonal averages heading into the first week of May, with the note that this late into the spring, the daily seasonal average rainfall at downtown San Francisco falls around two or three hundredths of an inch. && .AVIATION... (12Z TAFS) Issued at 425 AM PDT Wed Apr 22 2026 A mix of MVFR/VFR cigs this morning for the North Bay and Bay Area terminals. Once the majority of the rainfall shifts east into the Central Valley by early afternoon, expect VFR to prevail through the remainder of the TAF period. Southeast winds out ahead of the rainfall will become W/NW by the afternoon and remain relatively light. Vicinity of SFO...Mix of MVFR/VFR cigs this morning will become VFR by the afternoon and remain so through the TAF period. Southeast winds this morning will become northwest in the wake of the shower activity and remain relatively light. SFO Bridge Approach...Similar to SFO. Monterey Bay Terminals...Expect VFR to prevail through the TAF period with light rain from showers that will approach Monterey Bay by late morning. There is a slight chance for MVFR cigs if the showers move directly over the terminal, otherwise expect minimal impact. Southerly winds this morning will become westerly this afternoon and persist through the remainder of the TAF period. && .MARINE... (Today through Monday) Issued at 425 AM PDT Wed Apr 22 2026 Scattered light showers will drift southeast through the southern waters this morning into early afternoon. Moderate northwest breeze will develop this afternoon, then increase on Thursday to a fresh northwest breeze. Wind and seas will begin to gradually ease on Friday, continuing into the weekend. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...Small Craft Advisory from 3 PM to 9 PM PDT Thursday 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 from 3 AM Thursday to 3 PM PDT Friday for Pt Arena to Pt Reyes 10-60 NM. Small Craft Advisory from 3 PM Thursday to 3 AM PDT Friday for Pigeon Pt to Pt Pinos 10-60 NM. && $$ SHORT TERM...DialH LONG TERM....DialH AVIATION...JM MARINE...JM 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 |
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