With a stretch of VERY hot weather ahead for the rest of this month into August, it is a good idea to look at how we measure the heat stress on your body.

On Thursday at 2:37 a.m. an extreme heat warning was issued by the National Weather Service valid for Friday between 10 a.m. and 9 p.m. for Bucks County.

An extreme heat warning was issued by the National Weather Service on Thursday at 2:37 a.m. valid for Friday between 10 a.m. and 9 p.m. for Somerset, Middlesex, Mercer, Gloucester, Camden and Burlington counties.

The National Weather Service office in Mobile, Alabama, issued a heat advisory in Escambia, Santa Rosa and Okaloosa counties between 10 a.m. and 7 p.m. Monday. Heat index values are forecast to reach as high as 109℉ in portions of south central and southwest Alabama, northwest Florida and southeast Mississippi.

The National Weather Service has issued warnings in Mississippi for dangerous heat values across the state as warm temperatures and moist air will make temperatures feel like 105 to 110 degrees and higher in parts of the state this week.

The National Weather Service issued an extreme heat warning at 1:47 a.m. on Thursday valid for Friday between 11 a.m. and 8 p.m. for Passaic, Hudson, Bergen, Essex and Union counties.

The heat index, or apparent temperature, combines air temperature and humidity to indicate how hot it feels to the body. High humidity slows sweating, the body's natural cooling system, making temperatures feel hotter. The National Weather Service provides resources like a heat index calculator and chart to determine local heat index values.

The heat index is expected to be over 100 on July 23, as the Green Bay area is forecast to get temperatures up to 93, according to the National Weather Service Green Bay. With temperatures in the 90s and high humidity, the heat index for July 23 is 106 degrees.