Gigantic 'Heat Dome' Baking The Whole US May Be Historic, Scientists Say Environment

A massive heat dome is affecting much of the U.S., setting March heat records in 14 states.

Meteorologists predict this heat wave could be among the largest in American history.

Temperatures may reach the 90s Fahrenheit in southern and central plains by midweek.

The current heat wave is unprecedented in size compared to notable past events, though less intense.

Climate change has greatly contributed to the abnormal rise in temperatures, researchers say.