EcoWatch: Dangerous and potentially deadly heat will spread toward the Southwest this weekend while continuing to impact parts of the Plains and South.
Some cities have already received record-breaking temperatures this week:
Columbia, Missouri, broke its old record high of 96 degrees (set in 1952) by reaching 99 degrees on Wednesday.
Des Moines, Iowa, tied its old record high of 96 degrees (set in 1913) on Wednesday.
The most extreme heat in the coming days will be in the Desert Southwest where...