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When do heat and humidity feel "muggy?"

When do heat and humidity feel "muggy?"

FROM TODAY'S PRINT EDITIONS:

Veronica Piskor, in Bare Hills, wonders how forecasters can call for “muggy” weather when the expected relative humidity is less than 50 percent. “What constitutes muggy or humid in the meteorological community?

Forecasters watch the dew point, not relative humidity, because hot air can hold more moisture than cool air.

At 90 degrees, we feel uncomfortable at dew points of 65-69 degrees. But the RH may be only 44 - 52 percent (half the atmosphere’s capacity). Dew points above 70 degrees feel oppressive.

(SUN PHOTO: Doug Kapustin, 1998)

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