Federal officials declared a water shortage for the Hoover Dam’s Lake Mead, the largest water reservoir in the US. It will trigger mandatory water cuts to several western states starting next year.

The extended heat wave will continue through the week, according to the National Weather Service.

An unusually wet year is responsible for the biblical-seeming swarm of pallid-winged grasshoppers, according to entomologists.

Dozens of flights out of Phoenix, Arizona, have been cancelled because of extreme heat.

County health officials have detected a species of mosquito responsible for spreading Zika and other viruses for the first time in Southern Nevada.