Issued at 907 AM PDT Thu Oct 8 2026
Fog has begun to lift across coastal locations of the North Bay, San Francisco, and the San Francisco Peninsula this morning. However, areas of dense fog persist around the Monterey Bay and adjacent inland zones. Thus, have extended the Dense Fog Advisory through 10 AM in these areas with the anticipation of daytime heating to take over and improve visibilities. Otherwise, the Heat Advisory remains in effect for the interior through 10 PM this evening for all areas away from the immediate coastline.
RGass
, Issued at 1155 PM PDT Wed Oct 7 2026 (Tonight through Sunday)
Strong 500 mb high pressure ridging bringing inland areas hot and dry weather will continue into Thursday. Well above early October normal temperatures occurred again today, though none of the long term stations set any new record highs today. The Heat Advisory (WMO header WWUS76) for inland areas continues through 10 pm PDT Thursday. And a reminder there is a Coastal Flood Advisory (WHUS36) for anomalous high tides with up to 1.2 feet of inundation above ground level in low-lying areas.
As mentioned it'll be hot again inland Thursday while cooler temperatures will prevail along the immediate coastline within a compressed marine layer. NBM forecast highs were nudged downward slightly for much of the immediate coastline for Thursday. Global models continue to indicate a major pattern shift will take place over the western states beginning later tomorrow through Friday. A weak 500 mb low ~ 900 miles to our west will progress toward our forecast area allowing part of the aforementioned 500 mb high pressure ridge to slip westward (retrogressing) far to our west. Separate strengthening 500 mb troughing will take place over the Pacific Northwest; long wave troughing will begin to replace long wave ridging over the west. Mid-latitude amplification and winds will move the 500 mb trough southward, decidedly shifting the pattern south and east including the near term weak 500 mb low just out ahead of it and the rest of the 500 mb ridge. This pattern shift will bring in much cooler air from the surface up through 500 mb across the forecast area through the weekend.
Winds will become gusty over the coastal waters and gap winds will increase as well during the weekend, both Saturday and perhaps Sunday with gusts possibly nearing wind advisory level in the usual wind favored gaps across the San Francisco Peninsula and the East Bay.
..issued at 1155 PM PDT Wed Oct 7 2026 (Sunday night through next Wednesday)
Winds over land diminish later Sunday. There may be some residual moisture the cold core low will tap producing a few showers over the southern forecast area later Sunday and Monday. Otherwise dry and much cooler weather is forecast later Monday, Tuesday and Wednesday. Daytime highs and lows will shift to below normal. Daytime highs will generally be in the 60s coast to the 70s inland. Night-time and morning lows will mostly be in the 40s except around 50 at the coast and as cold as the 30s far inland valleys.
(12z TAFS) Issued at 428 AM PDT Thu Oct 8 2026
Currently LIFR-VFR. Dense fog has been observed at the coastal terminals of HAF, MRY, and SNS as well as STS overnight. An otter eddy will complicate things around the Monterey Bay, but generally high confidence in fog continuing through 16Z for the coastal terminals. STS has a shallow fog layer, but will still keep them prevailing fog through 16Z with at least 3 more hours of radiational cooling to go. Low confidence in fog reaching bayshore or interior terminals this morning. The marine layer is expected to deepen tonight, bringing increased (40-50%) chances for sub-VFR conditions at bayshore and interior terminals. Right now, it looks like it would be IFR and occur at the end of the current TAF period/into the next one. Diurnal winds will prevail.
Vicinity of SFO, Currently VFR with northwesterly flow. Moderate confidence on VFR and diurnal winds prevailing through the TAF period. With a deepening marine layer Thursday night, farther inland intrusion is expected. Stratus will likely make it through the Golden Gate Gap by 09Z, spreading north and south along the East Bay Hills, creating a donut hole around the terminal.
SFO Bridge Approach, Low probability for LIFR/IFR radiative stratus to develop around NUQ/SJC this morning. If it forms, it'll likely be short-lived with conditions improving by 16Z and clear skies by the afternoon. Moderate confidence on the San Mateo Bridge Approach being impacted Friday morning. It will likely be a combination of advective and radiative stratus with the most likely spots along the East Bay Hills and between SQL and SJC. Conditions will begin to improve by 16Z with clear skies expected by the afternoon.
Monterey Bay Terminals, Currently LIFR and calm at both terminals. An otter eddy in the Monterey Bay will keep fog around through at least mid-morning with conditions beginning to improve by 16Z. Persistence forecast on tap tonight with an early return of LIFR ceilings by 03Z and fog at 09Z. Diurnal winds will prevail.
(today through Tuesday) Issued at 907 AM PDT Thu Oct 8 2026
Moderate to fresh northwesterly breezes and moderate seas will prevail today. Conditions deteriorate Friday and into the weekend as northerly breezes increase to become strong to near gale across the coastal waters, Monterey Bay, and through the Golden Gate Gap. Gale force gusts are expected across the northern outer waters and the coastal jet region of Point Reyes. These winds will build rough to very rough seas. Long period southerly swell arrives Friday, with long period northwesterly swell arriving Sunday, creating a confused sea state.
Ca, Coastal Flood Advisory from 9 AM Friday to 3 PM PDT Tuesday for CAZ006-508-529-530.
Heat Advisory until 10 PM PDT this evening for CAZ503-504-506- 508-510-512>518.
Coastal Flood Advisory until 4 PM PDT Wednesday for CAZ506.
Dense Fog Advisory until 10 AM PDT this morning for CAZ529-530.
PZ, Dense Fog Advisory until 10 AM PDT this morning for Mry Bay.
Small Craft Advisory from 3 AM to 3 PM PDT Friday for Pt Arena to Pt Reyes 10-60 NM.
