Heavy lake-effect and lake-enhanced snow will persist downwind of the Great Lakes and produce some whiteout conditions that could cause difficult travel conditions. A coastal low will produce moderate to heavy snow over parts of southern and eastern New England into the afternoon. Below average temperatures are expected across the eastern U.S., particularly with chilly morning temperatures. Read More >
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242 FXUS66 KMTR 192031 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 1231 PM PST Mon Jan 19 2026 ...New SHORT TERM, LONG TERM... .KEY MESSAGES... Updated at 1230 PM PST Mon Jan 19 2026 - Dry weather, cool mornings, and mild afternoons this week - Morning fog across the Delta, North Bay Valleys, and interior East Bay Valleys && .SHORT TERM... Issued at 1230 PM PST Mon Jan 19 2026 (This evening through Tuesday) Very little change in day to day conditions anticipated through mid week. A ridge of high pressure remains just off of the Pacific coast that will continue to result in temperatures 5-10 degrees above average (up to 15 in the higher terrain). Overnight, we are expecting patch to areas of fog in the North Bay Valleys while tule fog (dense at times) is forecast to advect westward into the interior East Bay Valleys and Delta again either late tonight or into Tuesday morning. If driving or commuting in these areas; be aware of the potential for dense fog and be prepared for sudden changes in visibility, remember to slow down, and use your low beam headlights. Expecting a slight cool down on Tuesday as more widespread high clouds stream over the region, but only by a few degrees. Where mostly sunny sky conditions prevail, afternoon temperatures will warm into the mid 60s to lower 70s across the Central Coast and low to mid 60s elsewhere. That said, where fog lingers into late morning or early afternoon, expecting temperatures to only reach the upper 50s. && .LONG TERM... Issued at 1230 PM PST Mon Jan 19 2026 (Tuesday night through next Sunday) Dry conditions look to persist through much of the extended forecast. An upper level trough will develop over the north central Pacific between Tuesday night and Wednesday. A cut-off low will develop within that trough and move southward just off of the Bay Area/Central Coast, resulting in slightly cooler conditions and cloudier skies through late week. Thus, the greatest potential for rain will be across southern California and along the Santa Lucia Range on Thursday as a deeper plume of moisture advects inland to the south. However there is about a 20% probability of seeing greater than 0.01" and less than a 10% chance of that area seeing 0.10" over that area. A weak upper level ridge is forecast to develop by this weekend and into early next week. As a result, a slight warming trend is forecast, but not as warm as what we have been the past week. Longer range guidance continues to push back our next potential widespread rainfall. It is not until late January or early February that we forecast widespread rain to return to the region. && .AVIATION... (18Z TAFS) Issued at 903 AM PST Mon Jan 19 2026 Fog and stratus continue to mix out across the interior East Bay valleys with lingering impacts at CCR for the next couple of hours. Winds will remain light to gentle with a weak onshore breeze near the coast and offshore winds persisting inland. The TAF sites remain VFR through the day, with fog and stratus return to the North and East Bay valleys tonight with haze expected at LVK. High resolution model data depicts some chance for stratus development near LVK and in the San Francisco Bay tonight, but this is a low confidence forecast at this time. Vicinity of SFO... VFR through the day. High resolution model output is attempting to place a patch of stratus within the southern San Francisco Bay, but impacts to the terminal are not expected. Winds remain light with offshore flow lingering through the morning until mild onshore flow develops this afternoon. SFO Bridge Approach... Similar to SFO. Monterey Bay Terminals... VFR through the TAF period. Light north to northwest winds through the afternoon, with breezy valley drainage winds developing overnight. && .MARINE... (Today through Saturday) Issued at 844 AM PST Mon Jan 19 2026 Light to gentle northerly breezes persist across the waters this week. Slight increase in winds over the outer waters by late week as the large scale weather pattern begins to shift. Moderate period northwesterly swell enters the waters mid week, peaking Tuesday night into Wednesday morning. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...None. && $$ SHORT TERM...RGass LONG TERM....RGass AVIATION...DialH MARINE...DialH 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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