A report this week from Audacy documented roughly 1,000 additional deaths in France tied to a record-breaking heat event that shattered European temperature records. The deaths were concentrated among older adults and people without reliable access to cooling. France has been here before — the 2003 European heat wave killed more than 14,000 French citizens — and the country has since built a national alert system. It still wasn't enough.

California has its own version of this ledger. The September 2022 heat event pushed the state grid to the edge of rotating outages. The July 2006 heat wave killed more than 140 Californians in a single week, according to the California Department of Public Health's post-event review. The Central Valley, Inland Empire, and parts of the Bay Area interior regularly record temperatures well above what the coast experiences. When the grid strains, when older housing stock holds heat like an oven, and when people don't act in the first 24 hours, the consequences compound fast.

What's actually different about a heat emergency

Heat doesn't look like a disaster. There's no wall of smoke, no shaking ground. That's the problem. Families underestimate it because there's no visual signal to trigger the "emergency brain."

The physiological reality: heat stroke can develop in a healthy adult within hours of sustained exposure above 104°F core body temperature. Older adults, infants, people on diuretics or beta-blockers, and anyone who worked outside that morning are at elevated risk faster than most people expect. Air conditioning failure is not an inconvenience — it is a medical timeline.

California's grid operator, CAISO, publishes real-time demand data and has a Flex Alert notification system. Most households don't have it set up. The state's Cooling Center locator, run through county emergency management offices, is the fastest way to find a public cooling option — but most people don't know it exists until they're already symptomatic.

What we'd actually do

Register for CAISO Flex Alerts and your county's emergency notification system before this week ends. Both are free. CAISO alerts at flexalert.org take under two minutes to set up. Your county's system (most California counties use AlertSense, Everbridge, or Nixle) will push heat emergency notices directly to your phone. Knowing a Flex Alert is in effect 12 hours before a heat peak gives you time to pre-cool your home — running AC harder in the evening when demand is lower, then setting it higher during peak hours.

Identify your household's highest-risk person and build the plan around them, not around yourself. If you have a parent over 75, a child under two, or anyone on blood pressure medication, their threshold for heat illness is lower than yours. The France data, and California's own post-event reviews, consistently show that isolated older adults are the most likely fatalities. If someone in your network lives alone and doesn't have reliable cooling, a daily check-in call during a heat event is not a courtesy — it's a medical intervention.

Know the address of the nearest county cooling center before you need it. California's 211 system (call or text 211) connects to county social services and can give you the nearest cooling center in real time. Look it up now, save the address, and note the hours. Many centers open only during declared heat emergencies and close by 7 p.m. — details that matter when you're making a decision at 6:45.

Make your bedroom the coolest room in the house, not the living room. Core body temperature drops most during sleep. A single window AC unit or portable unit in the bedroom — doors closed, blackout curtains drawn — is more protective than whole-house fans running all day. If you rent and can't install a window unit, a $30 box fan combined with a bowl of ice placed in front of it and a wet sheet over the window provides meaningful temperature reduction.

Pre-position two days of water per person before a forecasted heat event, not during it. Stores near cooling centers run low quickly during regional emergencies. One gallon per person per day is the standard floor; in high heat with outdoor activity, that number doubles. Fill pitchers, jugs, or the bathtub the night before a heat advisory goes into effect.

The bigger picture

France's 2003 heat disaster prompted a nationwide overhaul of elder care protocols, heat alert systems, and urban planning. The lesson wasn't that heat waves are unforeseeable — it was that the systems around vulnerable people failed because no one had practiced using them. California has better infrastructure than most states, but infrastructure only works when households know how to access it. The goal isn't to survive a catastrophe. It's to never reach the point where survival is the question.