A CBS News report this week is tracking an extreme heat wave pressing down on Southern California, with temperatures in the Inland Empire and parts of Los Angeles County pushing well past 100°F. Forecasters are not offering a quick exit from this pattern.
That's the weather story. Here's the household story.
What's actually different about this heat event
California homes — particularly those built before 1990 in coastal and foothill communities — were not designed for sustained extreme heat. Many lack central air conditioning. Radiant barrier insulation is still not universal in older stock. And the state's electrical grid, managed by CAISO, has been asking residents to reduce usage during evening peak hours on high-demand days, which is precisely when families are home and trying to cool down.
This is not a hypothetical vulnerability. During the 2020 heat event, CAISO issued rotating outage orders affecting hundreds of thousands of customers. The grid has added renewables since then, but summer storage capacity remains a known constraint — something grid operators and the California Public Utilities Commission have publicly acknowledged in planning documents.
The second pressure point is water. Southern California draws heavily from the State Water Project and the Colorado River, both of which have faced reduced allocations in recent years. During sustained heat, municipal systems see demand spikes that can drop pressure and, in older infrastructure, create temporary service interruptions in specific neighborhoods.
Neither of these is a reason to panic. Both are reasons to be practical before tonight, not after.
What we'd actually do
Audit your home's peak-hour power draw and shift what you can. Run dishwashers, laundry, and EV charging before 4 p.m. or after 9 p.m. CAISO's flex alert windows typically run 4–9 p.m. — check the day's status at caiso.com each morning during a heat event. This reduces your bill, reduces outage risk for your block, and keeps your circuit breaker from tripping when you need it most.
Identify your household's medical heat risk now, not mid-event. Elderly residents, infants, anyone on diuretics, beta-blockers, or antipsychotics, and people with cardiovascular conditions face meaningfully higher heat-stroke risk. The California Department of Public Health maintains a list of cooling centers by county — look it up before you need it. If your household includes anyone in a risk category, that address should be written down on paper, not saved in a phone that might die in an outage.
Fill your bathtubs tonight. If water pressure drops or service interrupts, a full standard tub holds roughly 40–50 gallons — enough for drinking, sanitation, and basic cooling for two to four days. This costs nothing and takes two minutes. It also gives you water to wet towels, which remain one of the most effective passive cooling tools available.
Check your car's air conditioning before you need it as a refuge. During extended grid stress, your vehicle may become your most reliable cooling space. If the A/C hasn't been serviced recently, a recharge runs about $100–$150 at most shops. Know where your nearest 24-hour parking structure is — they stay significantly cooler than street parking and provide shelter if your home becomes unlivable overnight.
Stock oral rehydration salts, not just water. Plain water doesn't replace electrolytes lost through heavy sweating. Pedialyte packets, generic ORS powder, or even a homemade salt-sugar solution (a pinch of salt, a teaspoon of sugar per liter) make a difference in preventing heat exhaustion from progressing. A two-week supply costs under $15 at most pharmacies.
The bigger picture
Southern California has always had hot summers. What's shifted is the frequency of days above threshold temperatures and the duration of overnight lows that don't drop enough to let houses and bodies recover. That means the margin for error is smaller for households that haven't updated their baseline assumptions.
Preparedness here doesn't require a bunker or a generator. It requires knowing your grid operator's flex hours, knowing your family's medical exposures, and filling a tub. The goal isn't to survive a catastrophe. It's to not be the family that ends up in an ER because the house hit 95°F at midnight and nobody had a plan.
