High Heat Builds in South-Central U.S.

High pressure intensifies in the south-central U.S. today, leading to anomalous heat and health concerns.

In the northern gulf, a stagnant blob of high pressure has formed a rigid dome of heat. Beneath this heat dome, both torrid temperatures and humidity have become trapped in the Southeast and surge northward into the Great Plains.

As a result, a heat wave is ongoing across much of the region. Daily high temperatures surpassing the century mark and approaching 110 degrees are expected across much of Texas into Kansas. Additionally, heat indices within the same, blazing range will be felt under deep humidity in Missouri and southern Illinois as well as across much of the Deep South and Florida. Daily highs for heat indices will reach at least into the 90s or lower 100s across much of the southern and central High Plains, the Lower Midwest, and Lower Mid-Atlantic.

In the center of the Great Plains, there will be little nightly respite from the heat, with daily low heat indices tonight not falling below the upper 80s and even lower 90s locally. Heat indices will not drop below the mid-70s across most of the South and Gulf Coast either tonight. Warm low temperatures such as these, in combination with the high humidity, can lead to an increased risk of heat-related illness, and could have an impact on power, water, and transportation systems.

Extreme Heat Warnings and Heat Advisories are posted for the coastal Southeast, the vast majority of Florida, as well as much of the Mid-Mississippi Valley and central Plains.

Areas experiencing extremely hot temperatures, it is exceptionally important to stay hydrated and cool. Avoid exposure to the sun from late morning into the early evening. Make sure to take frequent breaks in the air conditioning or shade, eat and dress lightly, and to use sun protection if outdoors. Always check the back seat before exiting your car, as a vehicle can reach 30 to 40 degrees higher than outdoor temperatures. Never leave kids or pets unattended and remember to “Look Before You Lock!”