, Issued at 1214 AM PDT Wed Apr 15 2026 (Today and tonight)
A weak fetch of onshore flow at the surface is struggling to maintain patches of low stratus along the SF Peninsula and the Salinas Valley late tonight. Progressive ridging aloft has resulted in very dry air in the mid/upper levels, that will persist into the early afternoon. A sharpening trough to our north will reach the North Bay tonight behind the exiting ridge, with a weak associated moisture gradient out ahead. However, increasing low and mid-level onshore flow will result in a moderate increase in cloud cover this afternoon. Breezy west winds out ahead of the dry surface boundary will eventually become northerly overnight as the upper trough pivots east and south. Temperatures today will be similar to yesterday, maybe a few degrees warmer inland where less cloud cover is expected. Temperatures tonight will still be on the cool side across the North Bay and higher elevations across the East Bay Hills with weak cool advection behind the dry surface boundary late tonight.
..issued at 1214 AM PDT Wed Apr 15 2026 (Thursday through Tuesday)
Gusty offshore flow will gradually spread south across our area after sunrise Thursday. The strongest winds will be at higher elevations, especially in the North Bay and East Bay Hills, but not expected to exceed 40mph. Temperatures on Thursday will be similar to Wednesday, right around normal in the 60s to low 70s. Temperatures overnight Thursday into Friday will be chilly once again with cooler air aloft lingering behind the exiting trough and surface wind fields easing simultaneously under clear skies leading to efficient radiational cooling. Thursday night should be an excellent night for star gazing. Progressive, yet high amplitude ridging bumps temperatures up Friday and Saturday, before the next trough arrives from the Pacific Northwest on Sunday. Consensus diverged in deterministic guidance from this time last night, thus confidence in timing, location and intensity of rainfall is still low. However, it still looks most of our area will see at least some light rain Sunday through Tuesday.
(18z TAFS) Issued at 1059 AM PDT Wed Apr 15 2026
AM clouds/fog have given way to mostly VFR for 18Z tafs. Some coastal strato-cu will occasionally impacts HAF and MRY. A weak boundary will sweep through this evening/early tonight bring a return of brief MVFR CIGS from approx 03Z-08Z depending on terminal. Behind the boundary offshore flow and drier air rush in kicking LL moisture out with VFR returning. Moderate wind speeds are expected at all TAF sites mentioned above throughout the day and night with some experiencing strong gusts. Winds are expected to decrease slightly by tomorrow morning before increasing again.
Vicinity of SFO, VFR with a few CU hugging the hills to the west. Probabilistic guidance brings frontal CIGS to the San Bruno gap close to 03Z and then over the terminal by 05-06Z. Once the boundary goes through drier air erodes MVFR cigs by 09-10Z
SFO Bridge Approach, CIGS arrival and clear tonight will be 30-60 min after terminal.
Monterey Bay Terminals, Around 03-04z tonight, lower CIGs will make their way through MRY, and SNS resulting in MVFR conditions. These low clouds will eventually dissipate out by early to mid- morning tomorrow and conditions will shift back to VFR, except at MRY where they will stick around through the end of the TAF period.
(today through Monday) Issued at 353 AM PDT Wed Apr 15 2026
Fresh northwest breezes and moderate seas will continue over the coastal waters through today. A mostly dry cold front will push through tonight followed by gusty northwesterly winds Thursday. These winds will build rough seas of 10-12 feet across the exposed coastal waters. Winds will ease back to moderate northwest breezes Friday through Saturday, allowing seas to gradually subside.
Ca, None. PZ, Small Craft Advisory from 3 PM to 9 PM PDT Thursday for Mry Bay.
Small Craft Advisory from 9 PM this evening to 9 PM PDT Thursday for Pigeon Pt to Pt Pinos 0-10 nm-Pt Arena to Pt Reyes 0-10 nm.
Small Craft Advisory from 3 PM this afternoon to 9 PM PDT Thursday for Pt Reyes to Pigeon Pt 0-10 nm.
Small Craft Advisory until 3 AM PDT Friday for Pt Pinos to Pt Piedras Blancas 0-10 nm.
Small Craft Advisory from 9 PM this evening to 3 AM PDT Friday for Pt Arena to Pt Reyes 10-60 NM.
Small Craft Advisory from 3 AM Thursday to 3 AM PDT Friday for Pigeon Pt to Pt Pinos 10-60 NM.
