Area Forecast Discussion
Issued by NWS San Francisco Bay Area, CA
Issued by NWS San Francisco Bay Area, CA
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708 FXUS66 KMTR 241802 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 1102 AM PDT Tue Sep 24 2024 ...New AVIATION... .SYNOPSIS... Issued at 229 AM PDT Tue Sep 24 2024 Heat Advisory in effect for interior East Bay through this evening. Temperatures on Wednesday cool to near the seasonal averages, slightly warming by Friday. && .UPDATE... Issued at 921 AM PDT Tue Sep 24 2024 Stratus coverage this morning is limited to the immediate coastal regions south of Pigeon Point. Another relatively warm day is still on track with clear skies across most of the region. The Fort Ord profiler, which showed the marine layer completely eroded away yesterday afternoon, is now showing the beginnings of its return, which is consistent with stratus returning inland tonight as low temperatures return to around the seasonal average. No updates needed to the forecast. DialH && .SHORT TERM... (Today and tonight) Issued at 229 AM PDT Tue Sep 24 2024 Another warm day in store across the region this afternoon, yet slightly cooler than yesterday. As such, a Heat Advisory remains in effect for the interior East Bay until 8 PM this evening due to widespread moderate HeatRisk with temperatures in the mid 90`s to near 100 degrees. Elsewhere, expecting temperatures to range from the low-to-upper 90`s in the region`s warmest interior spots, mid 80`s to lower 90`s around the San Francisco Bay Shoreline, and upper 60`s to mid 80`s as you get closer to the coast. Here`s a reminder about heat safety: * Stay hydrated and drink plenty of fluids. * Wear lightweight, light-colored clothing. * Reduce time spent outdoors or stay in the shade. * Never leave people or pets unattended in vehicles. * Use sunscreen if going to the coast or the pool. Tonight, expecting a significant cool-down especially in the higher terrain as high pressure aloft shifts east with lows dropping into the 60`s. In the lower elevations, generally expecting temperatures in the 50`s to lower 60`s in the warmer interior valleys. Low clouds will also spread inland as the marine layer deepens to around 1,000 feet. && .LONG TERM... (Wednesday through Monday) Issued at 229 AM PDT Tue Sep 24 2024 A more robust cool-down is anticipated for Wednesday as the ridge moves farther east and troughing builds over the West Coast. Temperatures on Wednesday cool to or slightly below seasonal averages. A gradual warming trend is then expected through Friday as a zonal pattern sets up to our north and weak upper level troughs move through to our south and southwest. The CPC outlooks leans toward above average temperatures and below average precipitation through the first week in October. && .AVIATION... (18Z TAFS) Issued at 1053 AM PDT Tue Sep 24 2024 As the heat ends a southerly surge is moving northerly along the coast and coastal waters. Impacts this morning were confined to mainly Monterey Bay terminals. In the near term, VFR conditions will prevail. However, by this evening the surge will usher clouds inland. First impacts will once again be for Monterey Bay terminal and then inland valleys/bays. The first night of a surge is usually shallow so cigs will be more in the IFR to MVFR range. Some fog will also be possible (15-25%). Vicinity of SFO...VFR with breezy NW winds late this afternoon. CIGS AOB 1k feet will move inside the bay overnight and impact operations for the Wednesday AM rush. SFO Bridge Approach...Similar to SFO,but cigs may arrive sooner and dissipate later than over the actual runways. Monterey Bay Terminals...VFR through this afternoon, but cigs return early this evening. && .MARINE... (Today through Sunday) Issued at 921 AM PDT Tue Sep 24 2024 Light to locally moderate northwesterly flow will prevail over the coastal waters. Strongest winds will be north of Point Reyes over the outer waters. Breezy onshore flow will continue through the West Delta each afternoon. A passing disturbance over the Pacific Northwest will result in stronger northerly flow and builds seas Wednesday night into Thursday. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...Heat Advisory until 8 PM PDT this evening for CAZ510-515. PZ...None. && $$ SHORT TERM...RGass LONG TERM....RGass AVIATION...MM MARINE...MM 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