, Issued at 1139 AM PDT Sun Apr 12 2026 (This afternoon through Monday)
Scattered to numerous rain showers and isolated thunderstorms will remain possible throughout this evening. This is as the colder air mass aloft continues to provide enough instability in the post- frontal environment. Now through early evening is when we have the greatest potential for convection as Surface Based CAPE remains between 200-700 J/kg across must of the region as a result of daytime heating. With the loss of daytime heating, the threat for thunderstorms will diminish and give way to mostly isolated to scattered rain showers, especially over the Pacific, Bay Area, and Central Coast. These rain showers may linger into midmorning on Monday as the mid/upper level low shift southward into southern California.
Overnight temperatures will be chilly as winds diminish with mid-to- upper 30s across the North Bay valleys and interior Central Coast (and higher elevations across the region). This may lead to frost formation the coldest, wind sheltered regions. However widespread frost is not likely.
Monday will be up to 7 degrees F cooler than average (up to 20 degrees F cooler in the higher elevations). Cloudy skies are anticpated to give way to mostly sunny skies by midday. However, fair weather cumulus will remain possible throughout the day over the higher terrain.
..issued at 1139 AM PDT Sun Apr 12 2026 (Monday night through next Saturday)
Troughing will remain in place through Wednesday with temperatures warming slightly as high pressure nudges eastward over the eastern Pacific. By Wednesday, another mid/upper level through is forecast to drop down the British Columbia coast and into the Pacific Northwest. This will bring the potential for light rain to the North Bay with a 15-30% chance of precipitation by Wednesday afternoon and into Wednesday night. Little to no measurable rainfall is currently anticipated. Thus, we are not currently expecting any major impacts from this system as it slides into the Great Basin Thursday and into Friday.
This will result in winds becoming offshore (northerly to northeasterly) across the North Bay Mountains and East Bay Hills Thursday afternoon and into Friday. Winds will also become offshore in other higher elevations across the Bay Area and Central Coast, however to a lesser extent. Again, fire weather concerns are not expected giving the decent wetting rainfall the region has experienced over the past several days.
Forecast ensembles indicate a good probability of shortwave ridging building in across the eastern Pacific Friday and through the upcoming weekend. Thus, temperatures look to warm into the mid-to- upper 60s near the coast and low-to-mid 70s across the interior.
(18z TAFS) Issued at 1051 AM PDT Sun Apr 12 2026
Scattered showers/tstorms continue to traverse the region this morning. Flight CAT will vary greatly with the passing shower activity with VFR to MVFR/IFR temporarily. Current timing keeps SHRA through 20-23Z with gradual clearing this afternoon. Winds will remain breezy to gusty through this timeframe as well. Winds ease after 00Z this evening. Given the ample low level moisture there is a 10-20% chc for Monday AM fog for the N Bay Valleys. Not high enough conf to include at this time
Vicinity of SFO, AWW for lightning through 3 PM. About 40-60% chc for the lightning with in 5 mi. Otherwise, periods wet runways, but thankfully more SW wind than SE. -SHRA will fade after 03Z with VFR developing.
SFO Bridge Approach, Similar to SFO.
Monterey Bay Terminals, Scattered showers are making their way through the Monterey peninsula bringing a persistent low-level cloud deck and a few passing mid-level clouds. Rain showers should clear out this afternoon by 2-3pm, but low clouds are expected to linger for the remainder of the day. Onshore winds will remain breezy with a few embedded gusts until the evening. There is some potential for another round of light rain showers to return later tonight after sunset, though confidence is low(20%) at this time.
(today through Friday) Issued at 1051 AM PDT Sun Apr 12 2026
Rain showers and isolated thunderstorms will continue to move through the waters today with lingering showers possible into early Monday morning. Any stronger shower or thunderstorm would be capable of producing strong and erratic winds. A moderate to fresh westerly breeze will prevail through the afternoon before veering to northwesterly tonight and diminishing. Winds continue to diminish and seas subside into the work week.
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 PM PDT this evening for Pigeon Pt to Pt Pinos 10-60 NM.
