100 F + 50% Humidity, Extreme Heat
Audience: Everyone, limit exposure regardless of fitness level
Air Temp
100°F
38°C
Humidity
50%
Heat Index
120°F
49°C
Risk band
Extreme Danger
What this means
Heat stroke is highly likely with continued exposure. Excessive Heat Warning territory. Deaths spike at this heat index in cities without widespread AC access.
What to do
Stay indoors with AC. Check on elderly neighbors and people without AC every 4 hours. Never leave kids or pets in a parked car, interior reaches 130 F in 15 minutes.
Source
NWS Excessive Heat WarningOther Extreme Danger scenarios
Not medical advice. The NWS Steadman heat index is a general guideline; individual heat tolerance varies with acclimatization, medications, and pre-existing conditions. Consult a medical professional for individual risk assessment.