dew point

Firstly, there’s the cooling and condensation process which cools humid air to its dew point, causing water vapour to condense into liquid water.

According to AccuWeather’s chief meteorologist Jonathan Porter, their index factors in weather conditions that NWS’s wind chill does not, such as dew point, cloud cover, and precipitation.

“With these very hot temps, generally, we’re going to see lower dew points, which can lead to fire concerns,” Adams said.

Two lines tracking dew point and temperature converged.

And since air temperatures cool with height, that air parcel may be chilled down to its dew point as it ascends.