Numerous severe storms with a potential for severe wind gusts, tornadoes (some potentially strong), and very large hail are expected in parts of the central and northern Plains. Heavy rainfall may bring a flooding threat to parts of the northern Plains and from the Ohio Valley to the Southeast. Fire weather concerns persist in the Four Corners Region. Hot and humid expected in the central U.S.. Read More >
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736 FXUS66 KMTR 091836 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 1136 AM PDT Tue Jun 9 2026 ...New AVIATION, MARINE... .KEY MESSAGES... Updated at 1208 AM PDT Tue Jun 9 2026 - Chance for coastal drizzle continues through the morning hours - Warmer and drier conditions expected Wednesday through Saturday - Moderate risk of heat-related illnesses for interior locations on Wednesday and Thursday - Elevated to near critical fire weather conditions in the interior Bay Area late Wednesday through Thursday && .SHORT TERM... Issued at 1208 AM PDT Tue Jun 9 2026 (Today and tonight) Light showers are moving through the Bay Area as an incoming cold front drags some moisture through the region. These showers have overperformed a little, and we`ve gotten reports of a few hundredths of an inch of rain as far south as the Santa Cruz Mountains. With continuing bands of precipitation moving through, have added a chance for coastal and foothill drizzle across the Bay Area and Santa Cruz County through the night, but accumulations are still light and won`t top a tenth of an inch across most of the Bay Area. Today will mark the beginnings of a pattern change as an upper level trough over the Pacific Northwest starts to shift eastwards and allow a building ridge to come in from the Pacific. Today`s highs will be seasonable to cool, but they will be slightly warmer than yesterday`s with highs in the middle 70s to middle 80s throughout the inland valleys, up to the upper 80s and near 90 in the warmest spots of southern Monterey County, the upper 60s to middle 70s near the bays, and the upper 50s to middle 60s along the Pacific coast. && .LONG TERM... Issued at 1208 AM PDT Tue Jun 9 2026 (Wednesday through Monday) The pattern change will continue through Wednesday and Thursday as the ridge extends into the West Coast while the trough dips a little south of due east to create an inside slider-like setup, allowing for a dramatic warming of temperatures for the middle and latter parts of the week. In addition, strong northerly gusts and low humidities late on Wednesday into Thursday could result in elevated to near-critical fire weather conditions across the North Bay interior mountains, the Diablo range across the interior East Bay, and the eastern Santa Clara County mountains. For more information on the expected conditions, see the FIRE WEATHER section. Hot temperatures on Wednesday and Thursday will contribute to Moderate HeatRisk across the inland regions, as high temperatures reach the 90s into the triple digits across the inland valleys, while temperatures reach the 80s to lower 90s close to the bays and the 60s to the middle 70s at the Pacific Coast. This corresponds to a moderate risk of heat-related illnesses, especially for people sensitive to heat including children, the elderly, pregnant women, people with chronic health conditions, and people who work or live outside without adequate cooling or shelter. People spending time outdoors should take frequent breaks in the shade and drink plenty of water. The ridging pattern will persist Friday into the upcoming weekend with the ridge axis further developing into the northeast Pacific off British Columbia and the Alaskan panhandle, and the current forecast depicts a gradual cooling trend during that time persisting into the early part of next week. Confidence remains low regarding the time that a marine layer redevelops, but model output hints that the marine layer stratus could return as soon as Saturday or Sunday. Conversely, without any major large-scale forcing to move the general ridging pattern away, temperatures could continue to trend warmer for Friday and the following weekend. The extended range outlook has around a 50-50 chance that temperatures remain above the seasonal average heading into the third week of June. && .AVIATION... (18Z TAFS) Issued at 1133 AM PDT Tue Jun 9 2026 Lingering MVFR ceilings are making their way out of the region by this afternoon. Widespread VFR conditions are also expected to prevail by the afternoon through the TAF period. W to NW winds increase to a moderate breeze (10-15kts) with a few terminals experiencing ~20kt gusts. Winds begin to ease by sunset and continue to diminish overnight. Vicinity of SFO...VFR through the TAF period. High confidence that westerly winds will increase by the early afternoon with some embedded gusts above 20kts. Winds are expected to diminish overnight and increase back to moderate breezes by Wednesday early afternoon. SFO Bridge Approach...Similar to SFO. Monterey Bay Terminals...The remaining low-level clouds are currently mixing out as onshore winds increase by the early afternoon. NW winds are expected to begin to ease by sunset and remain light overnight. Low confidence on an MVFR ceiling this evening given how dry the atmosphere is (and will continue to be) in this post-frontal environment. VFR all the way! && .MARINE... (Today through Sunday) Issued at 1133 AM PDT Tue Jun 9 2026 Fresh to moderate northwest breezes will build seas today resulting in hazardous conditions for small craft across the waters through Thursday afternoon. Gale force gusts will spread across the northern waters Wednesday night into early Thursday. Wind and seas begin to ease by Thursday evening and are expected to stay light through the weekend. && .FIRE WEATHER... Issued at 1208 AM PDT Tue Jun 9 2026 Hot temperatures, gusty north winds, and low humidities across the North Bay interior mountains into the Diablo Range will raise the fire weather threats late on Wednesday into Thursday, with a particular emphasis on the interior mountains of Napa County. Although the strongest winds will remain within the Sacramento Valley, gusts of 25 to 35 mph are expected to spread into Napa County and the Diablo Range south through Santa Clara County, with stronger gusts of 40-50 mph possible along the Vaca Mountains along Napa County`s eastern edge. Meanwhile, daytime humidity retention will be very poor with relative humidity values as low as 10-15%, while overnight recoveries are likewise poor as RH values top out at 20-30%. Thus, fuels are expected to dry rapidly, leading to the elevated fire weather concerns. Also important to note that even with the drizzle and light rain coming through the region, wetting rains (rain totals above 0.1") are not expected, limiting any relief that will be realized for the midweek period. Elsewhere across the district, conditions remain hot and dry, but we`re not expecting winds to be as strong as they are across the interior North Bay. We are continuing to monitor the potential for fire weather products to be issued for the interior mountains of the North, East, and South Bays for Wednesday and Thursday. At present, conditions are right on the edge of critical fire weather criteria, but the confidence isn`t there at this point to pull the trigger on any warnings. The day shift will reevaluate the fire weather forecast for Wednesday and Thursday and in collaboration with neighboring offices, will be in a better position to determine the extent of necessary products. Regardless of whether any products are issued across the interior, elevated to near critical fire weather conditions are still forecast and care must be taken to avoid starting a fire that could spread rapidly. Remember, one less spark, one less wildfire. DialH && .MTR WATCHES/WARNINGS/ADVISORIES... CA...Red Flag Warning from 11 PM Wednesday to 9 AM PDT Thursday for CAZ504-515. PZ...Small Craft Advisory until 9 PM PDT this evening for Mry Bay-Pt Arena to Pt Reyes 10-60 NM. Small Craft Advisory from 9 AM to 9 PM PDT Wednesday for Mry Bay. Small Craft Advisory until 9 AM PDT Wednesday for Pt Arena to Pt Reyes 0-10 nm. Gale Warning from 9 AM Wednesday to 3 AM PDT Thursday for Pt Arena to Pt Reyes 0-10 nm. Small Craft Advisory until 9 PM PDT Wednesday for Pigeon Pt to Pt Pinos 0-10 nm-Pt Reyes to Pigeon Pt 0-10 nm. Small Craft Advisory until 3 AM PDT Thursday for Pt Pinos to Pt Piedras Blancas 0-10 nm. Gale Warning from 9 PM this evening to 3 AM PDT Thursday for Pt Arena to Pt Reyes 10-60 NM. Small Craft Advisory until 3 PM PDT Thursday for Pigeon Pt to Pt Pinos 10-60 NM. && $$ SHORT TERM...DialH LONG TERM....DialH AVIATION...Navarrete MARINE...CW 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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