This weather wonder talks about one of the most misunderstood weather words...relative humidity. RH is not so much a measure of how much humidity is in the air as it is a measure of how close the airmass is to saturation. RH will go up as temperatures go down and vice versa without any moisture being added or taken away from the airmass. RH is a valuable measure of how efficient an airmass is at evapotranspiration and evaporation and is very valuable for fire forecasting and forecasting dry microburst thunderstorms.
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