The strongest heat dome on the planet is currently centered over the Central U.S., fueling a dangerous and expansive heat wave that is expected to last through at least the first week of August. WHAT IS A HEAT DOME AND HOW CAN IT AFFECT YOU DURING THE SUMMER MONTHS? Record highs broken on Saturday. (FOX Weather)Record highs broken on Saturday. EXTREME HEAT SAFETY: RECOGNIZING SIGNS OF HEAT ILLNESS AND HOW TO TREAT ITStay with FOX Weather for the latest conditions throughout the dangerous heat.