A wet Memorial Day weekend is in store for the East, with widespread rainfall of 1 to more than 2 inches expected from the Gulf Coast to southern New England. Well above normal temperatures are forecast to build across the northern Plains. Another round of heavy to excessive rainfall is expected to impact the western Gulf Coast this weekend with Flood Watches in effect. Read More >
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794 FXUS66 KMTR 231740 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 1040 AM PDT Sat May 23 2026 ...New AVIATION... .KEY MESSAGES... Updated at 1200 AM PDT Sat May 23 2026 - Diurnally driven onshore winds during the afternoon and early evening through the early part of next week - Gradual cooling trend begins today with seasonal temperatures for the upcoming weekend and cooler temperatures early next week, followed by warming into the mid week && .SHORT TERM... Issued at 1028 AM PDT Sat May 23 2026 (This afternoon through Sunday) Another deep marine layer setup with plenty of cloud cover pushing inland this morning. The passing weak low pressure will keep stratus mixing around the coast, but the areas inland will see the lower clouds erode quickly in the sun. The North Bay looks to keep cloud cover longer than previous days due to this low, leading to a delayed warm up for the interior valleys and overall cooler conditions. Highs today will range from the 50 along the coast, 60s for areas more inland, 70s for the more interior areas, and into the lower 80s for the far interior. This will be coupled with a fair amount of humidity retention during the day, and great recoveries overnight. The deep marine layer and more of and inland push of the marine air will keep most of the overnight lows in the 50s, with only the far interior falling into the 40s. Sunday will offer largely similar conditions, with slightly earlier clearing times for that inland North Bay cloud cover. Overall high temperatures will be slightly cooler, but only by a few degrees. && .LONG TERM... Issued at 1028 AM PDT Sat May 23 2026 (Sunday night through next Friday) The marine layer deepens into Sunday night and will push even farther inland by Memorial Day, leading to widespread cloud cover. This will also cause slower clearing for the interior, and the potential for little to no clearing along the coast. Expect cool coastal conditions under cloudy skies with highs in the 50s. Then the areas slightly inland will hover around the mid to lower 60s, and the far interior will be in the 70s. Only a few portions of the far interior look to break 80. The next pattern change looks to arrive Tuesday with a low pressure moving down the coast. Longer models have slight disagreements on the track of this low, and unfortunately those differences affect the Bay Area a good amount. If this low pushing inland to the north of the Bay Area, dry off shore flow will cause a jump up in temperatures, not to hazardous levels, but a notable increase. If the low focuses over the SF Bay, chances for drizzle along with continued cooling. The there`s a chance the low builds far inland and becomes a cut-off low, giving a uniform, yet weaker, offshore flow. The current forecast follows the first resolution listed, leading to a warmer Tuesday for the Bay Area, but continued cooling for areas to the south. This will be followed by a warming and drying trend for the rest of the work week. Luckily, after that initial jump in temperatures, the rest of the warming trend looks to be gradual. But much can change in the mid to long term forecast, so be sure to keep checking in! && .AVIATION... (18Z TAFS) Issued at 1040 AM PDT Sat May 23 2026 MVFR-VFR during the 18z TAFs, with the highest probability of VFR during the afternoon and early evening. A few night and morning patches of light coastal drizzle or sprinkles are possible. Vicinity of SFO...VFR for the remainder of today, stratus /MVFR/ returns 11z-17z Sunday. VFR late Sunday morning and afternoon. Southwest wind 7 to 14 knots SFO Bridge Approach...Similar to SFO. Monterey Bay Terminals...Stratus /MVFR/ mixing out to VFR during the afternoon. Stratus /MVFR/ returns tonight and Sunday morning. West to northwest winds 5 to 10 knots except afternoon and evening winds 10 to 20 knots in the Salinas Valley. && .MARINE... (Today through Thursday) Issued at 1028 AM PDT Sat May 23 2026 Northerly winds will gradually decrease this morning over the northern outer waters allowing rough seas to gradually subside as well. Elsewhere, west to southwesterly winds will remain light to gentle with moderate wave heights. Seas abate to moderate heights by midday today and then hold through early Tuesday morning. An incoming trough is set to approach our waters late Monday night, bringing strong northwesterly winds and building rough seas. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...None. && $$ SHORT TERM...Murdock LONG TERM....Murdock AVIATION...Canepa MARINE...Canepa 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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