Severe thunderstorms will persist tonight across the Middle Mississippi Valley, producing damaging winds, large to very large hail and several tornadoes. Low humidity and windy conditions will continue to produce elevated to critical fire weather conditions across the southern High Plains into midweek. Read More >
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378 FXUS66 KMTR 272343 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 443 PM PDT Mon Apr 27 2026 ...New AVIATION, MARINE... .KEY MESSAGES... Updated at 1055 AM PDT Mon Apr 27 2026 - Warming and drying trend kicks off Tuesday, peaking Thursday and Friday - Cooler conditions return this weekend with a chance of rain && .SHORT TERM... Issued at 1055 AM PDT Mon Apr 27 2026 (This afternoon through tonight) Isolated light rain showers are continuing with the help of remnant surface troughing across the Bay Area. Activity will wane this afternoon, giving way to a mix of sun and clouds and below normal temperatures. With remnant moisture, low clouds will return to bayshore and coastal locations tonight as the lower levels destabilize. && .LONG TERM... Issued at 1055 AM PDT Mon Apr 27 2026 (Tuesday through Sunday) The upper-level troughing that brought us light rain over the weekend will pinch off a cutoff low as upper-level longwave ridging moves in from the Eastern Pacific Ocean. This will result in a warming and drying trend with temperatures rebounding to near to slightly above normal. The warmest day of the week will be on Thursday for the Bay Area and Friday for the Central Coast. The locations of the two features, ridge over the Pacific Northwest and low off the coast of Southern California, will support light offshore flow during the overnight hours. Subsidence aloft and offshore flow in the higher terrain will likely yield a shallow marine layer that will only impact coastal locations. Global ensemble clusters are in agreement that the ridge will get tamped down by an approaching upper-level trough as we approach the weekend. There is some uncertainty on how we get there, but by Sunday it is likely that there will be an upper-level low off the California Coast. While there`s no measurable precipitation in the forecast right now, this will renew chances for rainfall as we head into next week. && .AVIATION... (00Z TAFS) Issued at 437 PM PDT Mon Apr 27 2026 VRF through the evening rush. CU field across the region is thinning as the sun sets. Expect VFR to persist into the first part of tonight. A more stable lower level and weak flow will lead to stratus develop tonight. Lower confidence for stratus develop is SJC, but enough prob guidance hints to justify a mention. Late morning clearing for stratus on Tuesday. Breezy to gusty onshore winds will lingering through early Monday evening. Vicinity of SFO...VFR through most of tonight with clouds reforming near 10Z Tuesday. Onshore gusts of 20-25 kt through Monday evening then decreasing overnight and then another push Tuesday afternoon. SFO Bridge Approach...VFR. Some MVFR patchy cigs may impact portions of the approach early Tuesday. Monterey Bay Terminals...VFR. Latest guidance does bring some MVFR cigs back, but late tonight and more so Tuesday AM. && .MARINE... (Tonight through next Saturday) Issued at 437 PM PDT Mon Apr 27 2026 Moderate NW winds will persist through Tuesday before gradually increasing to a fresh to strong breeze Wednesday through Friday. These stronger winds will build rough seas of 8-12 feet across exposed waters. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...Small Craft Advisory from 9 PM this evening to 3 PM PDT Wednesday for Pt Arena to Pt Reyes 10-60 NM. && $$ SHORT TERM...Sarment LONG TERM....Sarment AVIATION...MM MARINE...Flynn 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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