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(WUSA) - Washington D.C.'s first day of summer felt like a scorcher and heat advisories are in effect until Thursday.

The D.C. metro area is under a heat advisory until 10 p.m. and from noon to 10 p.m. Thursday. The heat index reached 101 degrees Wednesday and the temperature is expected to rise even higher on Thursday.

Tips for keeping cool are to stay inside in an air conditioned room and to drink plenty of fluids. If you have to venture outdoors, be sure to wear light-colored and loose fitted clothing, a hat, and sunscreen.

Authorities are issuing warnings to check on elderly neighbors, and be sure pets have shade and plenty of fresh water.

By Benny Magno, wusa9.com