Area Forecast Discussion
Issued by NWS San Francisco Bay Area, CA
Issued by NWS San Francisco Bay Area, CA
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326 FXUS66 KMTR 201051 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 351 AM PDT Fri Sep 20 2024 ...New SYNOPSIS, SHORT TERM, LONG TERM... .SYNOPSIS... Issued at 350 AM PDT Fri Sep 20 2024 Warmer temperatures today mark the beginning of a steady warming trend that will persist through the weekend into the beginning of next week. Moderate heat risk conditions are still possible for many interior locations Monday and Tuesday, but forecast trend has been slightly cooler. && .SHORT TERM... (Today and tonight) Issued at 350 AM PDT Fri Sep 20 2024 Low stratus clouds have filled in along the coastline and interior gaps and valleys overnight and will begin to erode by mid/late morning except along the immediate coastline, especially Monterey Bay, where the marine boundary layer is reestablished with light onshore flow throughout the day. Gradual but steady H50 height increases in the wake of the upper low moving inland over SOCAL this afternoon will lift temperatures up about 5 degrees over inland locations from yesterdays high temperatures. High pressure continues to build offshore tomorrow, driving temperatures warmer on Saturday to around normal values for this time of year. && .LONG TERM... (Saturday through Thursday) Issued at 350 AM PDT Fri Sep 20 2024 Temperatures will gradually warm through the weekend into the beginning of next week. The forecasted max temperatures have trended slightly cooler but moderate heat risk across many inland locations Monday and Tuesday may still lead to the need for a Heat Advisory for those two days. There is poor consensus for the evolution of the synoptic pattern west of the Rockies for the first half of next week, as a weak upper level low develops off the coast of SOCAL. Nonetheless, temperatures moderate somewhat for the second half of next week from Monday and Tuesdays peak. We appear to remain dry through the extended forecast after some welcomed rainfall over southern Monterey County yesterday. && .AVIATION... (06Z TAFS) Issued at 1045 PM PDT Thu Sep 19 2024 Coastal stratus and fog /LIFR-IFR/ moving inland on onshore winds tonight and Friday morning, MVFR-VFR farthest inland. Stratus and fog mixing out back to near the coast and bays by late Friday morning and afternoon. Vicinity of SFO...Satellite shows stratus moving inland, at SFO tempo IFR 06z-10z then IFR prevailing to 16z, MVFR to 1730z Friday. West to southwest wind 5 to 15 knots. SFO Bridge Approach...Similar to SFO. Monterey Bay Terminals...LIFR-IFR due to stratus and fog tonight and Friday morning, conditions improving to MVFR-VFR by late Friday morning and afternoon. Onshore winds mainly 5 to 15 knots. && .MARINE... (Tonight through next Wednesday) Issued at 1037 PM PDT Thu Sep 19 2024 Northwesterly breezes will be gentle to moderate, with fresh gusts over the outer waters through Monday. Seas will be moderate, continuing to build and remain rough in the outer waters through Monday. Winds decrease and seas abate Tuesday through the end of the forecast period. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...Small Craft Advisory until 9 PM PDT Saturday for Pt Arena to Pt Reyes 10-60 NM. && $$ SHORT TERM...JM LONG TERM....JM AVIATION...Canepa MARINE...Kennedy Visit us at www.weather.gov/sanfrancisco Follow us on Facebook, Twitter, and YouTube at: www.facebook.com/nwsbayarea www.twitter.com/nwsbayarea www.youtube.com/nwsbayarea