Dew points tell tale of falling humidity

May 17, 2012|By Scott Dance

It hasn't been extraordinarily hot in a while, but the moist weather system that moved through early this week had humidity at uncomfortable levels. A look at dew points shows just how uncomfortable -- and how pleasant it will be for the weekend.

The dew point is the temperature at which water vapor in the air turns liquid, and it is dependent on both temperature and relative humidity. Dew point calculators like this one can help illustrate the relationship.

Early this week, temperatures in the upper 70s and high relative humidity percentages had dew points around 70 degrees. That is considered very humid and perceived as uncomfortable to virtually everyone.

But a cool front has dropped the air moisture Thursday. Temperatures were 67 degrees at the Sun weather station downtown as of 10:30 a.m., but low humidity meant a dew point of 54. At BWI Marshall Airport, the temperature was 66 degrees and the dew point 47 degrees, more than 20 degrees below a few days ago.

The warm yet dry conditions are expected to last through the weekend. Saturday, dew points shouldn't go much higher than 50 degrees. It won't feel like a normal muggy Baltimore summer just yet.

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