Overnight lows, not scorching afternoons, drove the record — a warning sign scientists call unmistakable evidence of climate change.

St. Louis faces heat index values up to 108 Tuesday and 110 Wednesday before storm chances bring a brief break.

Raleigh could hit 97 degrees Tuesday, with a heat index near 102 and thunderstorms possible after 3 p.m. The hot pattern continues through Friday before a cooler weekend arrives.

Detroit gets a warm, humid Tuesday before afternoon thunderstorms arrive. Drier, sunnier weather takes over Friday, but storm chances return for the weekend.

Miami faces a Heat Advisory Tuesday as the heat index climbs as high as 110°F. Storm chances increase later this week, with Thursday looking wettest.

Cincinnati faces dangerous heat, repeated thunderstorms and a flood threat through Wednesday morning, with damaging winds possible Tuesday afternoon and evening.

Columbus is under a Flood Watch through Wednesday morning as thunderstorms bring heavy rain and a potentially dangerous wind threat Tuesday afternoon and evening.

Jacksonville’s heat index could hit 110 Tuesday as afternoon storms return. The dangerous heat pattern is expected to continue through the weekend.

Cleveland gets a brief calm Tuesday morning before heavy rain and thunderstorms raise flood concerns through Wednesday.

Fog gives way to an 83-degree Tuesday in Pittsburgh, but repeated thunderstorms could bring heavy rain and localized flooding concerns.

Atlanta will reach 91 degrees Tuesday before afternoon storms return, with an even hotter stretch arriving by Saturday.

Orlando faces a Heat Advisory Tuesday as the heat index nears 110 degrees, with afternoon storms possible after 2 p.m. The dangerous heat pattern continues through the week.

NYC climbs to 88 degrees Tuesday before afternoon thunderstorms and a stretch of coastal flooding concerns. A cooler, sunnier weekend is ahead.