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Heat index tops 100 degrees Saturday

5:46 P.M. UPDATE: The Inner Harbor topped out at 98 degrees on Saturday, while BWI Airport hit 93 degrees, tying for the hottest temperature measured there so far this year.

ORIGINAL POST, 3:51 P.M.: Temperatures in the 90s with high humidity were making it feel around 100 degrees or hotter in Baltimore on Saturday afternoon.

At the Inner Harbor, it hit 97 degrees about 3 p.m. with a dew point of 70 degrees, a heat index of 104 degrees. Any dew point level above the mid-60s indicates high moisture in the air and feels uncomfortable and sticky.

By 3 p.m., Baltimore-Washington International Thurgood Marshall Airport reached 91 degrees, with a dew point of 70 degrees, for a heat index of 97 degrees. 

A so-called Bermuda high is responsible for the steamy weather. A high pressure system is settled off the southeast Atlantic coast, blocking other systems from moving eastward, keeping the weather mostly dry, and also pumping warm, moist air up from the Gulf of Mexico.

The hottest temperature recorded at BWI so far this year was 93 degrees on June 25.

Copyright © 2014, The Baltimore Sun
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