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 2018 was the fourth warmest year on record, and there is a global 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.
Warning vs. Watch
Excessive Heat Warning: Issued within 12 hours of the onset of dangerous heat conditions.
Excessive Heat Watch: Issued when conditions are conducive for dangerous heat conditions within the next 24 to 72 hours.