Super Typhoon Sinlaku will bring destructive winds, widespread heavy rain/flooding, thunderstorms, and coastal impacts to the Marianas Islands into Wednesday. Typhoon conditions are likely over the Northern Mariana Islands. Severe thunderstorms and heavy rain are expected from the Southern Plains to the Great Lakes through Tuesday. Heavy snow is expected in the Pacific Northwest. Read More >
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879 FXUS66 KMTR 140446 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 946 PM PDT Mon Apr 13 2026 ...New AVIATION, MARINE... .KEY MESSAGES... Updated at 1125 AM PDT Mon Apr 13 2026 - Slightly cooler to near normal temperatures through Thursday - Periods of gusty winds, especially at higher elevations Wednesday through Friday - Warmer temperatures return Friday and Saturday before unsettled weather returns for early next week && .SHORT TERM... Issued at 1125 AM PDT Mon Apr 13 2026 (This afternoon through Tuesday) Lingering rain showers persist over the Pacific late this morning with these forecast to diminish through the afternoon and evening. The RRFS (rapid refresh forecast system) and other CAMs (convection- allowing models) indicate the potential for isolated rain showers across the higher terrain of the southern Diablo Range and Santa Lucia Range this afternoon, diminishing as the sunsets. Otherwise, mostly dry conditions return to the region this afternoon with afternoon temperatures forecast to be in the upper 50s to low 60s near the coast and low-to-upper 60s across the interior. However, the highest peaks may not reach much above the upper 40s to low 50s. Tonight, temperatures will be chilly across the interior North Bay Valleys and interior Central Coast with mid-to-upper 30s expected. There is a low end potential for frost, yet widespread coverage in not currently anticipated. Elsewhere, temperatures will range from the low 40s to near 50 degrees F (warmest near the coast). For Tuesday, expecting dry conditions with temperatures warming regionwide by a few degrees as a shortwave ridge builds in wake of the exiting trough. && .LONG TERM... Issued at 1125 AM PDT Mon Apr 13 2026 (Tuesday night through next Sunday) Additional warming is expected on Wednesday, but only again by a few degrees. All of this is ahead of an approaching frontal boundary that is forecast to be mostly dry. However, there are chances across far northern Napa and Sonoma counties Wednesday afternoon and evening, generally less than 25%. This said, there very well may be light precipitation as far south as the Central Coast as the front moves across the region late Wednesday evening and into early Thursday morning. Little to no measurable rainfall expected with this system. In wake of this system, offshore winds are forecast to be strongest across the North Bay Mountains and East Bay hills Thursday and into Friday. This will be as the exiting system shifts into the Great Basin and/or Intermountain West. There still is some uncertainty with the exact track of this system, thus less confidence in the strength of offshore winds. However, widespread wetting rainfall across the region has greatly reduced fire weather concerns (at least in the short term). Weak ridging will build in behind the aforementioned system on Friday and Saturday with temperatures returning to near seasonal averages along with dry weather. Unsettled weather looks to return late Saturday and into early next week as another mid/upper level trough drops out of the Gulf of Alaska and approaches the West Coast. && .AVIATION... (06Z TAFS) Issued at 935 PM PDT Mon Apr 13 2026 A deep marine layer is trying to reform as the atmosphere re-stabilizes. The most likely impacts will be patchy MVFR stratus at coastal terminals, although there is a decent chance for brief impacts at inland terminals as well. There is very little chance of IFR conditions, however. Vicinity of SFO...Strong onshore wind will continue through the night and through the remainder of the TAF period. There is a 20-30% chance of MVFR ceilings between 12Z and 18Z Tuesday morning before skies clear in the late morning. SFO Bridge Approach...Similar to SFO. Monterey Bay Terminals...MVFR ceilings rolled in earlier than expected at MRY, and will very likely remain through mid morning at least. The bigger question is if and when they reach SNS. The most likely window is from 10Z to 17Z, before the cloud deck starts to mix out. && .MARINE... (Tonight through next Sunday) Issued at 935 PM PDT Mon Apr 13 2026 The gradient between high pressure in the East Pacific and lower pressure over California will support a moderate to fresh NW breeze and moderate seas across the exposed coastal waters through Wednesday. A cold front will increase winds to near gale force late Wednesday or early Thursday, building rough seas. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...Small Craft Advisory until 3 AM PDT Wednesday for Pt Arena to Pt Reyes 0-10 nm-Pt Arena to Pt Reyes 10-60 NM. Small Craft Advisory until 3 AM PDT Tuesday for Pt Reyes to Pigeon Pt 0-10 nm. Small Craft Advisory from 3 PM Tuesday to 3 AM PDT Wednesday for Pt Pinos to Pt Piedras Blancas 0-10 nm. && $$ SHORT TERM...RGass LONG TERM....RGass AVIATION...Flynn MARINE...Flynn 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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