The first big heat wave of 2025 has arrived, coinciding with the official start of summer. More than 40 million people in the U.S. were under heat alerts Friday.
Severe storms with winds of more than 100 mph left major damage across a wide swath of northern Minnesota overnight. The storms also produced tornadoes across eastern North Dakota, with authorities reporting at least three people killed.
An extreme heat warning is in effect as dangerously high heat index values between 105 and 110 are expected, driven by soaring temperatures in the upper 90s to low 100s and oppressive humidity with dew points in the 70s.
For many Americans, high humidity will make it feel in the triple digits. The National Weather Service is urging people to prepare to protect themselves from the dangers of extreme heat.
The summer solstice arrives with intense heat, soaring dew points and dangerous heat indices climbing into the triple digits. Meanwhile, strong to severe storms are expected to sweep through northern Minnesota late Friday night.
A cluster of severe storms is likely to roll down I-94 overnight from Fargo into the Twin Cities before dawn. The warm front will push heat index values over 100 degrees this weekend.
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