A very active spring pattern with tropical concerns across the Pacific. Heavy rainfall will continue to impact Hawaii this weekend. Meanwhile we continue to monitor a developing typhoon that may affect Guam into early next week. For the Lower 48, heavy snow for mountains of California this weekend, increase threat for severe thunderstorms next week for the Plains and record warmth spreads east. Read More >
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778 FXUS66 KMTR 121136 AFDMTR Area Forecast Discussion National Weather Service San Francisco CA 436 AM PDT Sun Apr 12 2026 ...New AVIATION, MARINE... .KEY MESSAGES... Updated at 1229 AM PDT Sun Apr 12 2026 - Scattered light showers with a slight chance of thunderstorms today will linger into early Monday - A gradual warming and drying trend returns through the remainder of extended forecast - Gusty winds, especially at higher elevations Wednesday and Thursday && .SHORT TERM... Issued at 1229 AM PDT Sun Apr 12 2026 (Today and tonight) The center of the upper level low will continue to slowly move onshore through the overnight as a secondary trough on the backside of the low shifts south well offshore today. Scattered weak showers offshore will drift onshore overnight, followed by scattered light showers, primarily over the North Bay after sunrise this morning and over the coastal ranges. Coverage of light showers will begin to increase once again by late morning into the afternoon as an upper trough axis shifts east-southeast across our area. There is a slight chance of thunderstorms after sunrise especially from areas where upslope flow will provide extra lift near the coastal ranges and eastern half of our forecast area. Temperatures will be slightly cooler than today, mostly from the mid-50s to mid-60s. Shower activity should mostly taper off by sunset. Rain totals will be light through the day, with up to a 0.25" for low lying areas, and up to 0.75" at higher elevations. && .LONG TERM... Issued at 1229 AM PDT Sun Apr 12 2026 (Monday through Saturday) Monday morning will feature some lingering offshore showers that may drift into Monterey County with only a few hundredths of rain expected where it does rain. By Tuesday, low amplitude ridging will begin a pleasant gradual warming trend. A sharpening trough axis extending southwest from a developing system from the Pacific Northwest into the Great Basin will produce a `back door slider` pattern for the second of the week. Gusty west winds at higher elevations on Wednesday will become northerly and the strongest gusts appear to not exceed 40 MPH attm. Thursday, gusty winds will become northerly behind the `back door slider` trough axis, with the downsloping component of the winds not impacting temperatures behind the dry frontal boundary pushing south through our area Thursday afternoon. Another round of shortwave ridging Friday will temperatures jump around 5 degrees into the low/mid 70s inland and low to mid 60s along the coast, and more gradual warming through the weekend. && .AVIATION... (12Z TAFS) Issued at 435 AM PDT Sun Apr 12 2026 Scattered showers continue and increase in frequency into the mid morning with winds becoming more moderate to breezy. Scattered to, at times, broken low clouds linger through the morning with more coverage from mid-level clouds through the day. Winds become more moderate to breezy as shower chances increase into the mid morning with some slight chances for isolated storms possible. Storm chances erode into the evening with winds reducing and showers becoming lighter and spottier. Shower activity ends into the night for the North Bay, but the rest of the region will see shower activity linger into Monday morning. Vicinity of SFO...Expect mostly mid level clouds through the day. Light to moderate southerly winds with passing showers last through the mid morning before breezier southwest winds build. This increase in winds will come along with increasing shower chances and slight chances for storms. Showers and storm chances reduce into the afternoon and evening. Expect gusts to fall off in the mid-evening and winds continue to reduce into the night. Shower activity will linger into early Monday, but exits as moderate northerly winds arrive. SFO Bridge Approach...Similar to SFO. Monterey Bay Terminals...Scattered shower chances increase onto the mid morning with prevailing mid-level clouds and scattered lower clouds. Winds become more moderate to breezy into the late morning and early afternoon. Shower chances and winds reduce into the evening. Winds remain light into the night, but shower activity increases slightly into the late night and lasts beyond the TAF period. && .MARINE... (Today through Friday) Issued at 435 AM PDT Sun Apr 12 2026 Showers and isolated storms move through the waters through the day with lingering showers possible into early Monday. Showers and storms could provide locally strong and gusty winds. Widespread breezy winds begin to ease into the evening and become lighter into the night. Winds continue to ease and seas abate into the work week. && .MTR WATCHES/WARNINGS/ADVISORIES... CA...None. PZ...Small Craft Advisory until 3 PM PDT this afternoon for Mry Bay- Pt Arena to Pt Reyes 10-60 NM-Pt Reyes to Pigeon Pt 0-10 nm- SF Bay N of Bay Bridge. Small Craft Advisory until 9 AM PDT this morning for Pigeon Pt to Pt Pinos 0-10 nm-Pt Pinos to Pt Piedras Blancas 0-10 nm. Small Craft Advisory until 9 PM PDT this evening for Pigeon Pt to Pt Pinos 10-60 NM. && $$ SHORT TERM...JM LONG TERM....JM AVIATION...Murdock MARINE...Murdock 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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