Heat in Marshall, Kentucky

Broad high pressure over the middle Mississippi River Valley resulted in temperatures surging to the mid-to-upper 90s with dew points in the mid 70s, yielding heat indices around 105-110 mainly from the 16th-19th in Western Kentucky with some locally higher values, mainly in the Jackson Purchase Area. Some sites reached heat indices high enough for duration based heat criteria starting on the 14th-15th, mainly near the Tennessee border. Northwest Kentucky had more frequent dew points in the lower 70s, limiting heat advisory criteria duration. A cold front the night of the 19th-20th brought an end to the heat. The highest observed heat index was 115 on the 19th at the McLean County Kentucky Mesonet site.