, 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.
(06z TAFS) Issued at 959 PM PDT Sun Apr 12 2026
Isolated showers persist across the region through Monday morning with MVFR-VFR conditions possible within the showers. Otherwise, generally VFR through Monday afternoon. Light to gentle winds continue overnight with moderate onshore flow will developing in the afternoon. There is a low confidence (around 10-20% probability) of fog developing in the interior valleys tonight due to the recent rainfall. Confidence is too low to put this in the TAFs at this time. Monitoring the potential for MVFR-IFR stratus to develop Monday evening, potentially impacting immediate coastal and interior valley terminals.
Vicinity of SFO, Periodic shower activity continues through Monday morning, with generally VFR conditions expect when showers pass over the terminal. Light winds persist overnight before northwesterly flow develops Monday afternoon.
SFO Bridge Approach, Similar to SFO.
Monterey Bay Terminals, Isolated showers across the region through Monday morning, otherwise VFR through Monday afternoon. Light drainage flow continues overnight before moderate northwest winds develop for Monday afternoon. Monitoring the potential for IFR-MVFR stratus to develop along the northern edge of the Santa Lucia and Gabilan ranges on Monday evening, with potential side impacts to the terminals.
(tonight through next Saturday) Issued at 959 PM PDT Sun Apr 12 2026
Isolated showers persist into early Monday morning. Gentle northwest winds are expected to prevail tonight through Monday morning, increasing to a moderate to fresh breeze through Wednesday and a strong breeze to near gale force by Thursday. Moderate seas continue through Wednesday before rough seas arrive on Thursday.
Ca, None. PZ, None.
