Heat

The heat dome set more than 1,500 temperature records across 11 states. Temperatures were 20 to 30 degrees above average in some places.

The approach involves making artificial snow when conditions are ideal, then piling it high under an insulated mat.

Nearly every snow basin in the Mountain West had one of its warmest winters on record and is well behind normal for water supplies.

Temperatures that are 20 to 40 degrees above average for this time of year will be common from the Southwest into the Great Plains.

The community of Martinez Lake in Arizona hit a jaw-dropping 110 degrees Fahrenheit on Thursday — the highest March temperature in U.S. recorded history.

Arizona and Nevada are likely to see temperatures in the triple digits, while cities such as San Francisco, L.A. and Denver could experience record highs.

More than half a million energy customers were without power early Monday as a wide-ranging pattern of severe weather continues.

As heat blasts the Southwest, a polar vortex is forecast for the Midwest and East. Snow is expected in the Great Lakes, and an atmospheric river is on tap for Hawaii.

Maricopa County and Clark County offer a cautionary tale about what it takes to keep people alive in extreme temperatures.

Temperatures across the region are expected to be up to 30 degrees higher than normal Friday and Saturday.