Over 100 million people have been under heat alerts across the U.S. over the past week and there is no sign of it cooling down anytime soon. The heatwave is expected to continue until at least Sunday.

The heatwave originally started in the south-central part of the nation but has reached most of the coastal areas.

“Sweltering summer heat will continue to produce very dangerous conditions through the upcoming weekend in several locations across the U.S. Excessive heat warnings and heat advisories are in effect today across the East, in the South and for parts of the Southwest,” the National Weather Service said Thursday.

“Also, severe thunderstorms with mainly damaging winds are possible today in parts of the Northeast and in the Southeast,” the NWS noted.

Many parts have been reporting temperatures in the high 90s. Some parts, like Texas, have been dealing with triple-digit temperatures.

“We’re sort of in our third wave of well-above-average temperatures this summer for south-central Texas,” Keith White, a meteorologist at the Weather Service in Austin, said Wednesday in an interview with the Washington Post.

Washington, D.C., is seeing unusually warm temperatures. On Sunday, the city could possibly hit 100 degrees for the first time in six years, the Post reported Thursday.