Heat History
Heat Wave History Timeline: Deadly Heat, Urban Risk, Power Demand, and Nighttime Temperatures
A heat wave history timeline covering deadly heat events, nighttime heat, humidity, city heat islands, power demand, and public health lessons.
Quick answer: Heat wave history shows that long duration, warm nights, humidity, and social vulnerability can make heat more deadly than dramatic-looking storms.
Health risk
Heat can build quietly over several days and affect people without obvious property damage.
Older adults, outdoor workers, people without cooling, and people with medical conditions face higher risk.
Urban heat
Cities can stay warmer at night because pavement and buildings store heat.
That reduces overnight recovery.
Preparedness lessons
Cooling centers, check-ins, hydration, shade, and alert messaging reduce heat impacts.
Power outages during heat waves can quickly become dangerous.