Issued at 911 AM PDT Sat Jul 25 2026
Stratus had a difficult time developing overnight into early this morning, despite a marine layer of around 900 feet per the 12Z OAK upper air sounding. That said, very shallow fog was observed in the Russian River Valley (which has since dissipated) and stratus was observed via satellite along the San Mateo coastline, into the western hills of the East Bay, and around the Monterey Bay region. Currently satellite imagery is showing lingering stratus along the San Mateo coastline. With the lack of cloud cover, temperatures this afternoon may be a few degrees warmer than what is currently forecast. However, onshore winds will persist throughout the day and allow for the marine influences to still be there.
RGass
, Issued at 1222 AM PDT Sat Jul 25 2026 (Today and tonight)
Persistence forecast with very little change in ambient weather conditions from 24hrs ago and no guidance indicating that the remainder of tonight and tomorrow will unfold much different than what we saw today. Dry air just above the marine layer continues to disrupt the inland intrusion we normally see this time of year, but not prevent it entirely, as persistent troughing over the EPAC and the western flank of high pressure centered over the Four Corners region continue to intersect over the Bay Area and Central Coast. The most impactful concern is the Beach Hazards Statement that goes into effect later this morning. Long period southerly swell from distant Fausto will make for dangerous sneaker waves and riptides. Never turn your back on the ocean and swim near lifeguards this weekend.
..issued at 1222 AM PDT Sat Jul 25 2026 (Sunday through Friday)
Normal temperatures for this time of year will continue through the weekend into the first half of next week, with very little change day-to-day through the middle of the week. Interior temperatures begin to rise a little more by the second half of the week as the area of high pressure expands westward and Fausto helps to push the persistent trough north and we begin to see H50 height rises over the EPAC. We begin to see more widespread Moderate HeatRisk across the interior by the end of the week into next weekend.
(18z TAFS) Issued at 1117 AM PDT Sat Jul 25 2026
It is a beautiful day across our region with widespread VFR conditions persisting into the evening. Winds remain moderate through the day and diminish to gentle breezes overnight. North Bay terminals will experience S-SW winds and terminals south of the Golden Gate will generally be W-NW. A compressed and dry marine layer with a depth of roughly 1000 feet returns overnight after ~08Z Saturday. It may be too compressed to fill in over SJC and LVK. Low confidence on whether STS will experience foggy conditions overnight. There is sufficient dry air at the surface that may inhibit fog formation even with a compressed marine layer, light winds, and clear skies overhead.
Vicinity of SFO, Clear skies and fresh westerly breezes with 30 kt gusts prevail into the evening. MVFR ceilings develop over the terminal around 10Z Saturday through 17-18Z. Medium confidence on the exact timing, though 09-10Z is fairly consistent with the trend we've seen the past couple of nights.
SFO Bridge Approach, Similar to SFO. May develop MVFR ceilings before and scatter out after SFO.
Monterey Bay Terminals, Moderate onshore winds persist through the day. IFR ceilings arrive at MRY first before filling in over SNS. High confidence on the estimated arrival of stratus, medium confidence on when it will scatter out of the terminals.
(today through Thursday) Issued at 911 AM PDT Sat Jul 25 2026
A long period southerly swell is impacting our coastal waters from distant tropical cyclone activity in the Eastern Pacific. These conditions will persist through the middle of next week. Fresh NW breezes with embedded gale force gusts prevail through the weekend. NW breezes increase to strong by the middle of next week as moderate seas build to rough in response.
Issued at 911 AM PDT Sat Jul 25 2026
Tropical cyclones in the Eastern Pacific are generating a long- period southwesterly swell which has reached the coastline of the San Francisco Bay Area and Central Coast. As such, sneaker waves and strong rip currents are the primary concerns. However, breaking waves can reach up to 10 feet along some south and southwest facing beaches and break points (like Santa Cruz, Pacifica, and parts of Stinson or Ocean Beach). Sneaker waves can have 20+ minutes in between the larger sets (breaking waves) with significant "flat/calm looking" times between them. This can potentially catch beachgoers by surprise and resulting in people being swept into the cold water; hence the name "sneaker". Rip currents are strong enough to pull the strongest swimmers away from shore. Swim near a lifeguard if possible. Stay back from the beach, and away from jetties, piers, beachside rocks, and other infrastructure near the water. Never turn your back to the ocean! The Beach Hazards Statement has been extended through Wednesday afternoon for all beaches along the Pacific Coast.
RGass
Ca, Beach Hazards Statement through Wednesday afternoon for CAZ006- 505-509-529-530.
PZ, Small Craft Advisory until 9 PM PDT this evening for Mry Bay.
Small Craft Advisory from 9 AM to 9 PM PDT Sunday for Mry Bay.
Small Craft Advisory from 9 AM to 3 PM PDT Monday for Mry Bay.
Small Craft Advisory until 3 PM PDT Monday for Pigeon Pt to Pt Pinos 0-10 nm-Pigeon Pt to Pt Pinos 10-60 NM-Pt Arena to Pt Reyes 0-10 nm.
Small Craft Advisory from 3 PM Sunday to 3 PM PDT Monday for Pt Arena to Pt Reyes 10-60 NM-Pt Reyes to Pigeon Pt 0-10 nm.
Gale Warning until 3 AM PDT Monday for Pt Pinos to Pt Piedras Blancas 0-10 nm.
