A heat advisory will be in effect from noon to 8 p.m. today in the Twin Tiers.
Heat index values are expected to be up to 100 degrees in New York and 103 degrees in Pennsylvania.
Hot temperatures and high humidity may cause heat illnesses, especially for the young and the elderly.
Health officials are recommending people drink plenty of fluids, stay in air-conditioned rooms, stay out of the sun and check up on relatives and neighbors.
