This week a dangerous heat wave settled over Midwestern and southern as triple-digit temperatures, combined with high humidity, have health officials urging people to stay hydrated and remain indoors. Nearly one-third of the U.S. population is expected to be in areas of dangerously hot and humid conditions, according to the National Weather Service. Excessive heat warnings and heat advisories span from Michigan to northern Florida and parts of southern California and Arizona. Dr, Christopher Sampson, Emergency Medicine Physician at the University of Missouri Health Care, joins Cheddar to offer tips on staying safe during this heatwave.