Dangerous, record-breaking heat will continue across most of the central and eastern U.S through Friday then focusing across the eastern U.S. through the Independence Day holiday weekend. Peak heat indices of up to 115 degrees are possible. Isolated to scattered severe thunderstorms are possible from the northern/central Plains into the Midwest, Ohio Valley, and Mid-Atlantic Friday. Read More >
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707 FXUS66 KMTR 031214 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 514 AM PDT Fri Jul 3 2026 ...New AVIATION, MARINE... .KEY MESSAGES... Updated at 1205 AM PDT Fri Jul 3 2026 - Marine layer will remain in place each day, retreating to the coast for many each afternoon. Under such conditions, temperatures will remain seasonally cool along the coast with a slight warmup for inland locations. - A brief cooldown will be seen at the start of the upcoming work week, with a warmup expected in the middle of next week. There will be low-end chances for some inland locations to see Moderate (orange) HeatRisk. && .SHORT TERM... Issued at 1205 AM PDT Fri Jul 3 2026 (Today and Saturday) Upper trough over the West Coast breaks down early on Friday, with a brief period of weak flow aloft. As we progress through the day on Friday, we will start to see height rise over the area, with warming temperatures aloft. Marine layer will remain in place for most coastal locations, with some breaks allowing for the sun to peak through. Although, with the marine layer and onshore winds in place, temperatures will be similar to previous days in the 60s. Inland areas will see some warming compared to previous days, with some locations seeing a 3-5 degree increase compared to Thursday. Overall, a pleasant day is ahead of us with Minor (yellow) HeatRisk for inland locations and Low (green) along the coast. Saturday, we will see similar conditions with slight height rises continuing through the day. This will once again result in slightly warmer conditions through the afternoon hours for inland locations, generally seeing a 1-3 degree increase compared to Friday. This would bring inland locations closer to the mid 80s, with some reaching the upper 80s. Coastal locations will largely remain in the low-mid 60s. One of the more notable changes is the increase in cloud cover through the afternoon hours on Saturday, especially for locations south of San Francisco. While there will be the chance for mostly clear conditions earlier in the day, the forecast will trend towards mostly cloudy skies by mid afternoon. This may lead to some fluctuations in the forecast high temperatures. && .LONG TERM... Issued at 1205 AM PDT Fri Jul 3 2026 (Sunday through Thursday) Sunday through Monday, we will see a weak upper shortwave move into the area from the southwest. This will bring another period of seasonally cool weather to the area. As was seen last week, this will result in a persistent marine layer each night/morning, which may remain over coastal locations through much of the daytime period. Although, some breaks in the clouds will be possible. Breezy conditions will also be in place as this wave passes through. Tuesday and beyond, a potent wave will start to dig into the Pacific Northwest while a ridge starts to build over the California coast or just off the coast over the Pacific. There remains uncertainty amongst global guidance on where this ridge axis will set up, which may result in some subtle forecast differences as we get closer. In either case through, we will see height rises over the region with warming temperatures aloft. In time, flow over California will generally be zonal at 500 hPa. With this pattern in mind, it would seem like are are going to enter another warming regime midweek and beyond , especially for inland locations. CPC supports this, indicating favorability for above normal temperatures over the region. Overall, we are looking at mid-upper 80s for interior locations, with some in the low 90s not out of question. While not a large signal at this time, there will be the chance for isolated inland locations to see Moderate (orange) HeatRisk conditions through this stretch. Otherwise, much of the area will range from Low (green) to Minor (yellow) HeatRisk. This will also be a period of breezy conditions, with onshore wind gusts between 20 to 25 mph at times. && .AVIATION... (12Z TAFS) Issued at 501 AM PDT Fri Jul 3 2026 Classic "No sky July" as we head into the upcoming holiday weekend. Solid marine over coastal waters and inland valleys with depth around 1500 feet with a many CIGs below 1000 ft. Better coverage of stratus in SF Bay than previously forecast. For the 12Z TAFs took a combo of persistence and HREF/HRRR blend. VFR expected this afternoon, minus KHAF. CIGs return again early tonight with a mix of IFR to MVFR. Conf is moderate to high Vicinity of SFO...Solid CIGs around 1400 ft. Will keep CIGs in play through at least 17Z. 30% chc of CIGs lasting through 18Z. VFR this afternoon with NW winds sustained mid teens with gusts up to 20 kt. SFO Bridge Approach...Similar to SFO. Monterey Bay Terminals...IFR cigs through 18-19Z . CIGs lurk in the bay all day before returning early this evening. && .MARINE... (Today through Wednesday) Issued at 501 AM PDT Fri Jul 3 2026 High pressure over the Eastern Pacific will maintain northerly flow over the coastal waters through the weekend. Locally hazardous conditions will persist over the northern outer waters through at least early Saturday due to strong breezes. Winds and seas look to build the middle of the next work week. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...Small Craft Advisory until 9 AM PDT Saturday for Pt Arena to Pt Reyes 10-60 NM. && $$ SHORT TERM...Gunkel LONG TERM....Gunkel AVIATION...MM MARINE...MM 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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