Extreme heat occurs when temperatures reach 90 degrees Fahrenheit or higher for at least two to three days. The National Oceanic and Atmospheric Administration reports 2019 was the second-warmest year on record globally, and there is a worldwide trend of warmer than average temperatures. Overexposure to heat can be hazardous, and the humid conditions frequently experienced in Indiana can add to the discomfort and danger of high temperatures.
Watch vs. Warning
- Excessive Heat Watch: Issued when conditions are conducive for dangerous heat conditions within the next 24 to 72 hours.
- Excessive Heat Warning: Issued within 12 hours of the onset of dangerous heat conditions.