A heat advisory is being issued for Bryan County and the surrounding areas from noon to 6 p.m. today.

According to the National Weather Service, temperatures in the low- to mid-90s combined with moderate humidity will make for heat index values of 105-110 degrees this afternoon. Some relief from the heat may occur late this afternoon as scattered to numerous showers and thunderstorms develop.

The heat index is a measure of how hot it feels when the effect of humidity is combined with the temperature. A heat index of 105 degrees is considered the level where many people begin to experience extreme discomfort or physical stress.

The heat index is measured under shady conditions so direct exposure will increase the heat index by as much as 15 degrees.