Understanding Summer Heat: What Heat Index, Dew Point, and Wet-Bulb Temperature Actually Mean
By
Andrea Thompson
Summary
This article explains the various meteorological measurements used to describe summer heat and humidity, including heat index, dew point, wet-bulb temperature, relative humidity, and heat risk categories. It breaks down what each measurement means, how it's calculated, and what it tells us about the actual experience of being outside in hot weather. The article aims to clarify the confusion around these multiple parameters and help readers understand which measurements are most relevant for assessing heat safety and comfort.
Source
Key quotes
· 5 pulledIt can be confusing, having multiple parameters or measurements to describe how hot it feels outside.
The heat index is what the temperature feels like to the human body when relative humidity is combined with the air temperature.
Dew point is the temperature at which the air can no longer hold all of its water vapor, and some of the water vapor must condense into liquid water.
Wet-bulb temperature is the lowest temperature that can be reached by evaporative cooling of a wetted thermometer.
Heat risk categories help communicate the potential health impacts of extreme heat events.
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