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Understanding the 'Feels-Like' Temperature During Severe Weather

June 17, 2026 · The Clime Team
Understanding the 'Feels-Like' Temperature During Severe Weather

During severe weather, understanding the 'feels-like' temperature, also known as the heat index, is crucial for assessing human comfort and safety. This metric combines air temperature and relative humidity to estimate how hot it feels to the human body.

What Is the Heat Index?

The heat index is a measure of the apparent temperature, indicating how hot it feels when relative humidity is factored in with the actual air temperature. It reflects the body's perception of heat, which is essential for evaluating heat-related health risks. (weather.gov)

How Is the Heat Index Calculated?

The heat index is calculated using a complex formula that incorporates both air temperature and relative humidity. The National Weather Service (NWS) utilizes a specific equation to determine the heat index:

HI = -42.379 + 2.04901523*T + 10.14333127*R - 0.22475541*T*R - 0.00683783*T² - 0.05481717*R² + 0.00122874*T²*R + 0.00085282*T*R² - 0.00000199*T²*R²

Where:

  • HI = Heat Index in degrees Fahrenheit
  • T = Air temperature in degrees Fahrenheit
  • R = Relative humidity as a percentage

This formula is valid for temperatures above 80°F and relative humidity above 40%. (products.climate.ncsu.edu)

Why Is the Heat Index Important?

The heat index is vital for assessing the risk of heat-related illnesses. High heat index values can lead to heat exhaustion, heat stroke, and other serious health issues. By understanding the heat index, individuals can take appropriate precautions during severe weather conditions. (weather.gov)

How Does Clime Help?

Clime provides real-time weather updates, including heat index information, to help users stay informed during severe weather events. By offering accurate and timely data, Clime enables individuals to make informed decisions and take necessary precautions to ensure their safety.

Conclusion

Understanding the heat index is essential for recognizing the true impact of severe weather on human comfort and health. By utilizing tools like Clime, individuals can access critical information to navigate extreme weather conditions effectively.

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