Scientists say a record-smashing March heat wave in the U.S. Southwest shows climate change is already driving more dangerous weather extremes.

Severe weather is plaguing the US from coast to coast, bringing a mix of extreme heat and bitter cold.

Several daily high temperature records or even March records could be broken this week as an unusually early heatwave settles over the Southwest.

Scientists say a record-smashing March heat wave in the U.S. Southwest shows climate change is already driving more dangerous weather extremes.

There are flooding rains in Hawaii, rare snow in Alabama and a severe heatwave in the west coast