, Issued at 1240 AM PDT Mon Sep 28 2026 (Monday through Tuesday)
An upper-level low will dig diagonally across the state Monday into Tuesday. Sensible weather wise, Monday will be the coolest day of the week with temperatures near to slightly below normal alongside onshore winds of 10-20 mph with gusts up to 30 mph. All signs point to the 2,000 ft marine layer mixing out, yet it prevails. The associated lift and accompanying wind from the aforementioned low will favor an earlier than normal clearing time of stratus (although it's more like stratocumulus out there). Of more impact is the northerly/offshore flow that will develop as upper-level ridging noses in from the Eastern Pacific Ocean in the low's wake. Wind speeds of 15-25 mph with gusts up to 35 mph can be expected across the interior higher terrain, especially the North Bay Interior Mountains and East Bay Interior Mountains. This will start tonight (Sunday night/Monday morning) and peak Monday night/Tuesday morning and Tuesday night/Wednesday morning. The combination of dry and windy conditions will yield elevated fire weather conditions for the higher terrain during this time. Tuesday and Wednesday will be warmer and drier from rising heights and northerly (drying) winds. Northerly/offshore flow will also minimize if not erode the marine layer, allowing the coast to warmup. Minor coastal flooding for bayshore locations along the San Francisco Bay, San Pablo Bay, and Monterey Bay during the highest high tide Monday through Thursday.
..issued at 1240 AM PDT Mon Sep 28 2026 (Wednesday through Sunday)
Global ensemble clusters are in agreement that upper-level ridging with anomalously high heights will dictate our forecast Wednesday through Sunday. 850 mb temperatures above the 90th percentile will support temperatures 10 to 15 degrees above normal. As a result, areas of moderate HeatRisk are expected across the interior above and away from the compressed (<~1,000 ft) marine layer. No daily maximum temperature records are in jeopardy.
(18z TAFS) Issued at 1026 AM PDT Mon Sep 28 2026
Marine layer impacts begin to fade 17-18Z as cigs/fog are thinning. Expect VFR this afternoon and most of tonight. Some CIGs will be possible late tonight around Monterey Bay. Less than 25% chc for fg at KSTS, but conf wasn't high enough to include it in the TAF.
Vicinity of SFO, Morning stratus has quickly faded and yielded VFR conditions. Will keep VFR through the rest of the TAF pd. NE flow will linger this morning before switching onshore this afternoon with higher gusts.
SFO Bridge Approach, Similar to SFO.
Monterey Bay Terminals, VFR this afternoon. CIGs return at MRY overnight, but conf is too low to include CIGs at SNS. Will carry a SCT group for clouds.
(today through Saturday) Issued at 1026 AM PDT Mon Sep 28 2026
High pressure strengthening over the Eastern Pacific will maintain moderate to strong northerly breezes through Wednesday. Strongest winds will be outer water north of Point Reyes and the Big Sur Coast. Rough seas will build in response to these winds and will subside to moderate by the end of the week due to northerly winds becoming light to moderate. Tropical activity will produce long period swell up to 16 seconds Wednesday and Thursday.
Ca, Coastal Flood Advisory until 5 PM PDT Thursday for CAZ006-506- 508-529-530.
PZ, Small Craft Advisory from 3 PM this afternoon to 3 AM PDT Wednesday for Pt Arena to Pt Reyes 0-10 nm.
Small Craft Advisory from 3 PM this afternoon to 9 PM PDT this evening for Pigeon Pt to Pt Pinos 0-10 nm.
Small Craft Advisory until 11 PM PDT this evening for Pt Pinos to Pt Piedras Blancas 0-10 nm.
Small Craft Advisory until 3 PM PDT Wednesday for Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 10-60 NM.
