Well above average temperatures are forecast today into Wednesday over most of the lower 48 states away from the Gulf Coast. A storm system passing across southern Canada will bring a wintry mix to the upper Great Lakes today. A trailing cold front will then bring the wintry mix from the central Appalachians through the Northeast U.S. Wednesday and Thursday. Read More >
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939 FXUS66 KMTR 131134 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 334 AM PST Tue Jan 13 2026 ...New AVIATION, MARINE... .KEY MESSAGES... Updated at 125 AM PST Tue Jan 13 2026 - Chilly conditions this morning give way to warm daytime temperatures through the week with light offshore winds - Elevated risk of sneaker waves through Thursday - Pattern change possible next week && .SHORT TERM... Issued at 125 AM PST Tue Jan 13 2026 (Today and tonight) Fog has developed tonight in parts of Sonoma County, namely the Russian River Valley and the northern Santa Rosa Plain. It`s a little hard to pick out in the satellite imagery, but it is being shown on local webcams and the observations from Sonoma County Airport. Visibilities should improve after sunrise this morning. Otherwise, skies remain clear across the Bay Area and Central Coast with light winds enhancing the chances for radiational cooling across the region. A Cold Weather Advisory is in effect across the interior North Bay and East Bay valleys and the interior Central Coast including the southern Salinas Valley through 9 AM as the lows dip into the lower to middle 30s across the area. Elsewhere, low temperatures reach the upper 30s to middle 40s in the lower elevations and upper 40s to lower 50s in the higher elevations. No significant weather concerns today as an upper level ridge continues to dominate the weather pattern across the western United States. Light offshore flow is expected to develop with wind gusts topping out around the 15 to 20 mph range, and even then only during the morning across favored regions near the Golden Gate and the Pajaro Valley. High temperatures range from the upper 50s to lower 60s in the San Francisco area and the East Bay, and the middle 60s to the lower 70s in the inland valleys. && .LONG TERM... Issued at 125 AM PST Tue Jan 13 2026 (Wednesday through Monday) For the weekly forecast, it`s wash, rinse, repeat. High pressure stalls over the western United States, resulting in an extended period of seasonally warm daytime highs, mild nighttime lows, and light offshore winds. To give an idea of the regional warmth, high temperatures through the upcoming weekend are around 5 degrees above the seasonal average in downtown San Francisco, and around 8 to 15 degrees above the seasonal average across the rest of the Bay Area and Central Coast. Towards the early part of next week, just beyond the end of the 7- day outlook, the upper level ridge begins to erode, allowing temperatures to cool. Beyond that, the level of uncertainty over the evolution of the weather pattern shoots upward. The previous forecaster noted the split between those models that break down the upper ridge more quickly into onshore flow and those that kept the ridging in place a little longer. Looking at the latest ensemble model cluster guidance, this still appears to be the case. By the 21st, the ensemble model clusters are split roughly half-to-half between those with a more pronounced trough across the West Coast and those that keep more zonal flow or even a residual ridge in place. All together, it appears that a period of more active weather may be in store as we head towards the end of the month. && .AVIATION... (12Z TAFS) Issued at 333 AM PST Tue Jan 13 2026 Currently VFR at all terminals with the exception of STS. Low visibility is expected through mid-morning at STS before giving way to VFR. Winds will generally be light and offshore, with the exception of moderate drainage winds down the Salinas Valley into SNS during the overnight periods. Moderate to high confidence on fog returning to STS tonight with VFR elsewhere. Vicinity of SFO...Currently VFR and calm at the terminal. Southeasterly winds this morning will back to become northeasterly this afternoon. High confidence on sustained winds remaining below 10 knots through the TAF period. SFO Bridge Approach...Similar to SFO. Monterey Bay Terminals...Currently VFR with drainage flow at both terminals. Winds will back to become northerly this afternoon with drainage winds returning tonight. && .MARINE... (Today through Sunday) Issued at 333 AM PST Tue Jan 13 2026 Gentle to moderate northerly winds will prevail through the week. Moderate seas will prevail through the week with the exception of the northwestern portion of the waters where rough seas will briefly build in Wednesday into Thursday. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...Cold Weather Advisory until 9 AM PST this morning for CAZ506-510- 516-518. PZ...None. && $$ SHORT TERM...DialH LONG TERM....DialH AVIATION...Sarment MARINE...Sarment 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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