BILLINGS, Mont. -- A firefighter died after suffering a cardiac emergency while battling a wildfire in southwest Montana. The firefighter was conducting suppression work on the ground, and a paramedic gave him medical aid, authorities said. However, attempts to resuscitate him failed, and he died Sunday afternoon.

The Pickett fire in Northern California's Napa County has burned nearly 4,700 acres since it broke out Thursday, according to the California Department of Forestry and Fire Protection. As of Saturday,

Dangerously hot conditions hit states up and down the West Coast over the weekend, owing to a persistent heat wave stretching from the Pacific Northwest to California and the desert Southwest.

Parts of California, Oregon and Washington state will experience extreme heat at least through Tuesday, forecasters said.

What do you do when the sun won’t leave you alone day and night? More than 50 million people in the Western United States are under heat advisories this weekend, with temperatures soaring into the triple digits from Washington to Arizona.