From the National Weather Service in Memphis
EXCESSIVE HEAT WARNING NOW IN EFFECT UNTIL MIDNIGHT CDT FRIDAY NIGHT…
WHAT…For the Excessive Heat Warning, dangerously hot conditions with heat index values above 110.
IMPACTS…Extreme heat and humidity will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities.
PRECAUTIONARY/PREPAREDNESS ACTIONS…
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Young children and pets should never be left unattended in vehicles under any circumstances.