While the calendar indicates summer is technically about a week away, Emergency Medical Services Authority officials in Oklahoma City have issued the first heat alert of the season.
EMSA spokeswoman Laura O'Leary said more than five heat-related calls were received on Thursday, so a heat alert was issued.
"We believe the heat, at that point, is having a serious impact on public safety. We need to warn the public," O'Leary told KTOK.
O'Leary advised people who must be outdoors to wear light-colored clothing and to drink plenty of water. She also said people should take frequent breaks from outdoor physical activity.