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

Heat warnings are in effect across region as record-high temperatures are forecast in California, Nevada and Arizona

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.