Sweltering and "dangerous" heat with indices surpassing 100 degrees Fahrenheit across parts of nine states has prompted the National Weather Service (NWS) to issue warnings for millions of Americans. Newsweek has reached out to NWS for comment via email on Thursday.

Dangerous heat will be followed by storms with damaging winds that could hit 65 miles per hour as a frontal system nears the Northeast. Heat-index values (combination of the temperature and humidity) on Friday,

Storm Team 3 Weather Aware Days have been issued for Sunday and Monday because conditions will be dangerously hot. It is possible that Savannah ties or breaks the record highs both days. Sunday’s record of 102°F set back in 2010. Monday’s record high is 102°F set back in 1949.

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.

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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.

High temperatures and humidity will combine to create potentially dangerous hot weather conditions over the Lowcountry for the next few days.