"A heat wave that has brought triple-digit temperatures to the Southwest for weeks is expected to expand this week to cover most of the country.
“The main story this week will be the continued excessive summer heat across the U.S.,” the National Weather Service said Monday in its its forecast discussion.
“For much of July hot dangerous conditions have been the normal in parts of the West, Texas and Florida. These summer conditions will build and expand across the Eastern two-thirds of the country this week, starting in the north-central states and Plains.”
As of Monday, excessive heat warnings and heat advisories were issued for parts of the Great Basin, Southwest, Intermountain West, Great Plains and southern Florida, with more expected across the country later this week."