, Issued at 1255 PM PDT Mon Aug 3 2026 (This evening through Tuesday night)
Nearterm:The southerly surge continues to inch its way northward along the coast and finally made it past Pt Reyes. The surge has really taken a bit out of temperatures along the immediate coast this afternoon. 24 hr trends show many locations along the coastline are running cooler than Sunday, which isn't surprising with nearby clouds. On the flip side, head inland and away from the surge influence and temps are soaring into the 90s and lower 100s. As such, Heat Adv remains in effect through this evening for Interior North Mts and Interior East/South Bays.
Tonight through Tuesday night: The surge will become less of a surge and more just onshore with more stratus. Moderate marine layer stratus coverage for inland areas tonight. This stratus will bring some relief and better RH, but above the shall layer will remain mild and dry.
Interesting set up for Tuesday as the upper level pattern shows a slight rebound of the ridge, but lower surface levels keep the southerly/onshore flow. Pretty hard to bet again stratus and cooler SST along the coast. As such, temperatures for Tuesday will be within a few degrees of Monday, but on the cooler side. Just enough to knock down HeatRisk values to Moderate with little to no Major.
Tuesday night will see even more stratus coverage with a slight deepening.
One final concern for the short term will be smoke/haze. Ample fire activity across OR/WA will push some smoke over the coastal waters. Longer range RRFS actually brings some smoke/haze to the coastal waters late Tuesday into Wednesday.
..issued at 1255 PM PDT Mon Aug 3 2026 (Wednesday through next Sunday)
Rinse and repeat for the long term, but in the other direction with a gradual warming and drying trend.
Upper level high pressure that briefly flattened will rebuild over the West Coast beginning late Wednesday lasting through at least Friday. While there is a slight reprieve in temps mid-week inland heat and increasing HeatRisk return Thursday and more so Friday. In fact, some of the guidance suggest an airmass approaching 30C at 850mb. 30C is a pretty toasty airmass, which would easily yield max temps over 100 across the interior. Would also expect mild overnight lows in the hills. If this trend continues we may need another Heat Advisory.
(06z TAFS) Issued at 941 PM PDT Mon Aug 3 2026
VFR will continue through the forecast period for the interior South Bay terminals, then IFR/LIFR developing around 10z for the North Bay and Bay Area terminals. IFR/LIFR ceilings returned earlier than expected to the Monterey Bay sites and will persist until early Tuesday afternoon.
Vicinity of SFO, VFR until at least midnight, with high confidence that IFR/LIFR ceilings will develop overnight. Given the earlier onset across Monterey Bay sites, theres a slight chance that stratus returns closer to 08z than 10z. High confidence that IFR ceilings persist until late morning with a slight chance of lingering into the early afternoon.
SFO Bridge Approach, Similar to SFO.
Monterey Bay Terminals, IFR/LIFR ceilings returned a little sooner than expected with high confidence of persisting into the early afternoon. VFR through the remainder of Tuesday afternoon once they lift with a sunset return Tuesday evening.
(tonight through next Sunday) Issued at 941 PM PDT Mon Aug 3 2026
Light to gentle breezes have set in across our outer waters with breezier south winds at times and pressure gradient forced onshore flow across the coastal waters tonight. Northwest seas will continue to ease and become 4-8ft for the remainder of the work week. Northwest winds begin to increase and become moderate by the end of the week into the weekend, with increasing seas responding by the weekend.
Ca, Heat Advisory until 10 PM PDT this evening for CAZ504-510- 513>515.
PZ, None.
