The combination of above normal high temperatures and relative humidity percentages will result in uncomfortably hot conditions for all of Deep South Texas and the Rio Grande Valley except for the Barrier Islands. Heat index values are expected to range between 105 and 110 degrees this afternoon and early evening. Isolated areas may briefly experience heat indices of 111 degrees for a short period of time. If working outside today, be sure to drink plenty of water, wear loose-fitting and light-colored clothing, and take frequent breaks in air-conditioned locations. Be sure to check on elderly and infirm neighbors and relatives, provide shade and fresh water for outdoor pets and livestock, and check the backseat of your vehicle when transporting children.