A strong cold front sweeping across the Northern Plains may bring snow showers and snow squalls from eastern Montana to north-central Nebraska, with blizzard conditions possible in eastern North Dakota and northwestern Montana. Heavy snow is expected to persist downwind of the Great Lakes. Snow showers will spread up the East Coast across the Mid-Atlantic and Northeast coasts. Read More >
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266 FXUS66 KMTR 190109 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 509 PM PST Sun Jan 18 2026 ...New AVIATION, MARINE... .KEY MESSAGES... Updated at 1251 PM PST Sun Jan 18 2026 - Dry weather, cool mornings, and warm afternoons this week - Morning fog across the Delta, North Bay Valleys, and interior East Bay Valleys && .SHORT TERM... Issued at 1251 PM PST Sun Jan 18 2026 (This evening through Monday) Temperatures continue to warm as mostly sunny sky conditions have returned to the region. However, there are still high clouds streaming in from the northwest. As such, temperatures are likely to warm into the low to upper 60s across the North Bay, East Bay, and greater San Francisco Bay Area. Across the Central Coast, temperatures are likely to warm into the low to mid 70s. Tonight, look for tule fog to return to the interior East Bay Valleys and Delta (similar timing as the previous nights) and continue through midmorning on Monday. Fog may also impact the North Bay Valleys in response to fog development in the Russian River Valley and/or tule fog advecting in from the east. Monday`s afternoon temperatures will be similar to those today (Sunday) as the region continues to be under the influence of high pressure. This ridge axis extends all the way up to just off of the British Columbia coast. However, high clouds will persist over the region through at least midweek. && .LONG TERM... Issued at 1251 PM PST Sun Jan 18 2026 (Monday night through next Saturday) By mid to late week, troughing will develop out over the north central Pacific. This feature is forecast to develop a cut-off upper level low that will gradually approach the region late in the week. However, there does not appear to be much of a moisture source associated with it, so rainfall has been pushed back until at least Monday, January 26th. With that said, the low pressure system aloft will at least cool temperatures down to near seasonal averages after a prolonged period of very warm afternoon temperatures. Thus, we will have to wait a bit longer for much needed rainfall to return. && .AVIATION... (00Z TAFS) Issued at 508 PM PST Sun Jan 18 2026 VFR continues for most TAF sites through the TAF period. The exceptions will be STS and APC which will see fog overnight as well as fog and haze possible at LVK. Winds will mostly say light through the TAF period with directions being mostly variable. Some sites along the coast will see northwest Monday afternoon, while others stay variable, and LVK goes easterly. Vicinity of SFO...VFR through the TAF period. Expect mostly light and variable winds through the night and much of the Monday before winds turn northwesterly in the late afternoon, but become variable again into the night. SFO Bridge Approach...Similar to SFO. Monterey Bay Terminals...VFR through the TAF period. West winds become more variable into the night. Southeast winds build at SNS in the late night and last into Monday afternoon before turning northwesterly in the mid afternoon. Winds at MTR look to stay light and variable through the end of the TAF period. && .MARINE... (Tonight through next Saturday) Issued at 508 PM PST Sun Jan 18 2026 Gentle to moderate northeast to east breezes persist across the San Pablo Bay, the Delta, and through the Golden Gate through Wednesday as light to gentle northeast to north winds continue across the rest of the coastal waters. Later this week, the ridge should break down as a weak cutoff low approaches, allowing winds to increase and shift to the northwest. Low seas up to around 6 feet continue through the middle of the week as a northwest swell builds. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...None. && $$ SHORT TERM...RGass LONG TERM....RGass AVIATION...Murdock 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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