, Issued at 1249 PM PDT Mon Mar 30 2026 (This evening through Tuesday)
The much anticipated pattern change is underway as seen with mid-to- high level clouds streaming in from a surface low pressure system in the Eastern Pacific Ocean. Cloudy and relatively cooler conditions, albeit still above average, can be the sensible weather expected today. The moisture fetch from the aforementioned low is coming from the tropics and will arrive tomorrow. While this may sound juicy, it will still have a dry atmosphere to overcome with little help from weak forcing. As such, light rain showers will produce little accumulation with the Big Sur Coast and Santa Cruz Mountains receiving relatively higher totals with the help of orographic lift.
..issued at 1249 PM PDT Mon Mar 30 2026 (Tuesday night through next Sunday)
The best chance for rain is Wednesday as a gale force low pressure system in the Gulf of Alaska heads to the Washington/Canada border. This system will have better support from surface to jet stream and will give us a true frontal passage. Beneficial, light rainfall is expected Wednesday into early Thursday morning. Slick roadways will be possible coming off a four week dry streak, especially in the North Bay given that the trajectory of this system being northwest to southeast. When all is said and done, rainfall totals from Tuesday to Thursday are expected to amount up to 0.25" with up to 0.50" possible in the higher terrain of the North Bay. The Interior Central Coast, Interior East Bay Valleys, and Santa Clara Valley will see a few hundredths at most. Moderate southwesterly winds ahead of the cold front will increase and back to become northwesterly in the post-frontal environment. Gusts of 20-30 mph can be expected with gusts up to 40 mph in the higher terrain. Upper- level shortwave ridging nosing in from the Eastern Pacific Ocean will tighten the pressure gradient and result in northerly (drying) winds on Thursday. As the ridge moves inland Friday, winds will further increase and veer to become offshore. Impactful winds are not expected except in the highest terrain. Upper-level longwave ridging will move in over the weekend, sending temperatures back up to well above normal.
(18z TAFS) Issued at 1035 AM PDT Mon Mar 30 2026
VFR conditions expected through the TAF period under a gradually lowering deck of high clouds. Winds will be gentle to moderate and diurnally driven. There is a slight but decreasing chance for stratus Tuesday morning. Disturbed weather is expected Tue-Thu with persistent mid level clouds, periods of gusty winds and occasional light rain.
Vicinity of SFO, The airport has been reporting calm winds for the last several hours. By 20Z onshore winds are expected to become established in the typical 280-300 direction. Winds will gradually increase to around 12-15 knots through the afternoon. Wind speeds will ease back to a gentle breeze through the evening and overnight hours. There is high confidence in VFR conditions persisting through the TAF period under lowering high clouds.
SFO Bridge Approach, Similar to SFO.
Monterey Bay Terminals, The brief fog impact has cleared and the terminals will enjoy VFR conditions through the day. There is a slight chance for stratus to move in around sunrise Tuesday, particularly at MRY. Otherwise high clouds will persist through the TAF period ahead of some disturbed weather Tuesday.
(today through Saturday) Issued at 1035 AM PDT Mon Mar 30 2026
Moderate northerly breezes will prevail today, backing to become southwesterly tomorrow. Fresh westerly breezes on Wednesday will increase and veer Thursday into Friday to become strong and northerly. Moderate seas will build to become rough to very rough Thursday into Friday. Widespread hazardous conditions will return Thursday as a result. Light rain showers are expected Tuesday morning through Thursday morning.
Ca, None. PZ, None.
