What the forecast actually says
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Area Forecast Discussions are the real forecasts, written 3 to 4 times daily by NWS meteorologists reading the models and interpreting what they mean for your area. They offer far deeper insight than any weather app, but they're written in dense meteorological shorthand. Plaincast uses Anthropic's Claude to summarize them into plain English, side by side with the annotated original.
Revised in 8 passages since the 8:53 PM discussion. See every revision.
Hotter than normal conditions will continue for the foreseeable future. Slight cooling will take place through Thursday, with heat increasing again Friday through Sunday. The hot and humid conditions during the day and night will bring elevated risks of heat-related illness.
Widespread MODERATE TO HIGH heat risk is very likely to return Friday into the weekend. Now is the time to start communicating this threat within your community and family, and consider rescheduling activities that might but you or your loved ones at risk. Have a plan to stay cool, especially if work or other activities take you outside mid morning to mid evening hours or do not have access to air conditioning. See extended discussion below for weather details.
Fairly quiet conditions expected through the short term, aside from the very warm and humid conditions (although somewhat cooler than recent days) and areas of gusty winds. The strong upper high affecting the region is centered over New Mexico and the Texas Panhandle, with ridging extending westward over Southern California. This scenario will change little over the next couple of days. Highs will be in the 80s to around 100 degrees away from the coast with the coastal areas around 70 to 80 degrees.
Surface pressure gradients are moderate onshore from LAX to Daggett, supporting gusty southwest winds of 25 to 35 mph. Stronger gradients are noted between Santa Barbara to Santa Maria, peaking at -3.7 mb at 8pm. Winds across SW Santa Barbara County are gusting 35 to 45 mph, strongest near Refugio and Gaviota. Will issue a Wind Advisory for the SW Coast of SBA County and the adjacent Santa Ynez Range through 3am Tuesday.
The morning low cloud pattern should change little tonight into tomorrow morning. Low clouds are forecast to reform across the LA coast and portions of the Central Coast. Lower confidence in the San Luis Obispo coast and the Ventura Coast, with a 30% chance of low clouds.
A large south swell from Major Hurricane Genevieve will further enhance large wave and potentially deadly rip currents for some area beaches. See Beaches discussion below and associated coastal hazard products for details.
There will be another round of gusty Sundowner winds across southwest Santa Barbara County the winds look a little weaker than last evenings and will likely come in just under advisory levels.
Widespread MODERATE TO HIGH heat risk is very likely to return Friday into the weekend. Now is the time to start socializing this threat with your community and family and consider rescheduling activities that might but you or your loved ones at risk. Have a plan to stay cool, especially if work or other activities take you outside mid-morning to mid-evening hours or do not have access to air conditioning.
RECORD BREAKING or tying (for at least July since 1999) 500 mb heights of 598-600 dm is likely sometime Friday into Saturday with only modest weakening into early next week. A Heat Watch will eventually be needed to cover this very concerning period (especially Friday through Sunday) Widespread highs of 95-105 away from the coast with pockets of 105-115 in warmest coastal valleys to interior are likely during the peak of the heatwave Friday and Saturday. Highs 80-95 will be common coastal areas away from the beaches. Overnight lows in the 70s and 80s for many areas will increase risk for heat stress through prolonged exposure and limited ability for dwellings without air conditioning to cool overnight.
There is also an increased risk for large and dangerous fires due to the hot and unstable conditions with pockets of gusty winds, perhaps, especially southwest Santa Barbara County and the I-5 corridor in the mountains into the weekend.
Night to morning low clouds will diminish or disappear during this time, although weakened onshore focused to the east will somewhat limit the heat nearest the coast. However, well above normal water temperatures will somewhat maintain the humid muggy feeling near the coast, decreasing the body's ability to cool through sweating.
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