A ridge of high pressure moved just west of the region. Combined with a surface high pressure just east of the region bringing moist southerly flow, the heat and the humidity were oppressive across southern Indiana and central Kentucky. The map below indicates the highest values of the heat index, a measure of how the air feels to the human body, reached over the combined two-day period of Monday and Tuesday, July 11th and 12th for the various automated weather stations and Kentucky mesonet stations across the region.
More heat is expected across the region for the next several days. High temperatures will reach around 90 degrees this weekend, though the Bluegrass and Lake Cumberland areas may only see the mid 80s Saturday. Monday's highs are expected to get into the lower 90s, with each day Tuesday - Thursday forecast to get progressively warmer. Stay tuned over the next couple of days for the possible issuance of heat advisories, and prepare ahead of time for the heat!