Columbia Association camp counselors Ben Eve and Taylor Kimble

Columbia Association camp counselors Ben Eve, left, and Taylor Kimble got a little relief from the heat Thursday as they paddled on Wilde Lake. The temperatue reached the lower 90s Thursday and could reach 100 on Friday. (Staff photo by Sarah Hogue / June 28, 2012)

With temperatures soaring into the mid-90s Thursday afternoon and even higher temperatures on the way, Howard County's Health Department issued its second heat advisory this year, covering June 29 through July 1.

The National Weather Service anticipates temperatures to approach 100 degrees from Friday through Sunday. The advisory warns that the humidity will make it feel hotter than 100 degrees.

The Health Department recommends that residents with health concerns stay inside for their safety; anyone going outside should wear light-colored, loose clothing and apply sunscreen.

Residents also should be aware of symptoms of heat-related illness, the advisory said, including weakness, muscle cramps, nausea, disorientation and fainting.

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County senior centers and libraries will be open their regular hours for people in need of cool shelter.

Howard County's previous heat advisory this year began the first day of summer, June 20, and lasted through the following day.