Over 120 million Americans across 28 states remain on alert for dangerously hot and humid weather on Wednesday as a heat wave continues to bake the eastern half of the country. But relief is on the way beginning Thursday in the Northeast. Parts of Louisiana and most of Mississippi are under extreme heat warnings on Wednesday, with heat indices -- what the temperature feels like with humidity -- reaching up to 120 degrees. Memphis, Tennessee, which is under an extreme heat warning, could see a heat index reaching 115 degrees on Wednesday. Washington, D.C., could reach a heat index of up to 109 degrees on Wednesday, while it will feel like 104 degrees in Philadelphia and 102 degrees in New York City. For actual temperatures, Philadelphia and Baltimore could reach a daily record high of 99. N

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