 Much of Maryland under a heat advisory today from noon to 8 p.m. National Weather Service says the hot temps and high humidity will make for a heat index of about 105 or 106 degrees. During the advisory, public encouraged to drink plenty of fluids, stay in air-conditioned rooms, stay out of the sun, and check on relatives and neighbors, children and pets, whether we should never be left unattended in vehicles. And under these kinds of temperatures, a child or a pet left in a vehicle can die within moments.