Heavy to excessive rainfall may lead to flooding Wednesday over southwest Pennsylvania into northern West Virginia, and western Maryland. Flood Watches have been issued. An extended period of hot weather will continue for parts of coastal southern California including Los Angeles through Thursday. Heat Advisories remain in effect. Read More >
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563 FXUS66 KMTR 210121 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 621 PM PDT Tue May 20 2025 ...New AVIATION... .SYNOPSIS... Issued at 244 PM PDT Tue May 20 2025 Elevated fire weather concerns through Thursday, which will be accompanied with strong and gust northwesterly winds and above normal seasonal temperatures. A pattern change happens late in the week which will bring cooler temperatures for Friday, with temperatures gradually warming over the weekend. && .SHORT TERM... (This evening through Wednesday) Issued at 244 PM PDT Tue May 20 2025 Key Messages -Elevated fire weather concerns -Breezy north to northwest winds -Above normal seasonal temperatures Upper level dynamics become more lean more zonal with minor signs of weak ridging. At the surface, we remain nestled between low pressure to our east and high pressure to our west leading to a tighter pressure gradient overhead. Breezy north to northwest winds look to persist through the period; however, warmer high temperatures and drier air is on tap for Wednesday. The elevated fire weather concerns will continue for finer fuels such as brush and grass, especially for interior regions. && .LONG TERM... (Wednesday night through next Monday) Issued at 244 PM PDT Tue May 20 2025 Key Messages -Elevated fire weather concerns through Thursday -Breezy north to northwest winds -Cooler temperatures Thursday and Friday, seasonal temperatures return An upper level trough swings through the PacNW on Thursday, which will bring slightly cooler weather to the region. A fairly dry day is still on tap, in terms of RH and no rain, with improving RH overnight. A secondary, and more broad upper level wave approaches the west and Central Coast for Friday, which will bring the coolest temperatures of the week. Upper level ridging looks to quickly fill behind it, leading to the return seasonal temperatures. && .AVIATION... (00Z TAFS) Issued at 621 PM PDT Tue May 20 2025 The marine layer depth to the lower level temperature inversion varies from 700 feet to 1200 feet. Drier to much drier air is in the atmospheric mix within the gusty northwest winds along the coast, resulting in VFR. Gusty northwest winds are otherwise resulting in haze/hazy conditions due to sea spray/salt condensation nuclei lofted into the marine layer. The northerly ACV-SFO pressure gradient has strengthened to 7.4 mb, the onshore gradient SFO-SAC is 3.2 mb. Strong and gusty west wind is currently focused to SFO with recent peak wind gust to 35 knots at 2327z. Additional areas of strong wind gusts are likely into the evening before the pressure gradients and winds begin to subside. Drier air tonight and Wednesday will help keep VFR going, except along the immediate coast a few patches of stratus and/or fog may develop late at night and/or early morning. Otherwise VFR is forecast Wednesday. Gusty west to northwest winds likely Wednesday afternoon and evening. Vicinity of SFO...VFR. West wind gusts to 35 knots until 04z this evening, wind diminishing to 5 to 15 knots tonight and Wednesday morning. West wind gusts near 25 knots Wednesday afternoon and evening. SFO Bridge Approach...Similar to SFO. Monterey Bay Terminals...VFR except patchy stratus and/or fog /IFR/ late tonight and Wednesday morning. Onshore winds 10 to 20 knots early to mid evening, then decreasing to 5 knots tonight and Wednesday morning, increasing to 10 to 20 knots Wednesday afternoon and early evening. && .MARINE... (Tonight through next Sunday) Issued at 244 PM PDT Tue May 20 2025 Widespread strong northerly breezes with gale force gusts are expected over the inner and outer waters into Wednesday. Hazardous marine conditions will persist through Thursday with strong northwesterly breezes with gale force gusts and rough to very rough seas. Winds will diminish and seas will subside gradually into the upcoming weekend. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...Small Craft Advisory until 9 PM PDT this evening for Mry Bay. Gale Warning until 3 AM PDT Wednesday for Pigeon Pt to Pt Pinos 0-10 nm-Pt Arena to Pt Reyes 0-10 nm-Pt Reyes to Pigeon Pt 0-10 nm. Gale Warning until 9 AM PDT Wednesday for Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 10-60 NM-Pt Pinos to Pt Piedras Blancas 0-10 nm. && $$ SHORT TERM...KR LONG TERM....KR AVIATION...Canepa MARINE...RGass 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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