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All three types of alert are based on Heat Index (HI)
values. The Heat Index is a measure of how hot it feels when relative humidity
(RH) is added to the actual air temperature.
For example, if the air temperature is 80° F and the relative humidity
is 70%, the Heat Index (how it feels) is 83° F, and if the air temperature is
90° F and the relative humidity is 70%, the Heat Index is 105° F. If you’re in
the sun, these temperatures may feel up to 15 degrees hotter.
As hot as it might be outside, car interiors and other
unventilated spaces get even hotter. Dark dashboards and car seats contribute
to the heating of cars. The sun on an 80° F day can heat the interior of a car
to 123° F in one hour. Interior surfaces
directly exposed to the sun can be even hotter.
Heat safety tips
Resource: Heat: A Major Killer
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