a day ago
Where the summer's first heat wave will soon drive record humidity and temperatures
The first heat wave of summer, starting Friday in central states, will bring days of extreme conditions to many cities across the United States — with humidity levels reaching far beyond what is normal for the time of year.
A heat dome — a heat-trapping lid of strong high pressure in the atmosphere — will expand eastward after forming Friday and intensify through next week. For a week or longer, it's expected to lead to hundreds of record-breaking temperatures, tropical levels of humidity and abundant sunshine — a combination that can be dangerous, elevating the risk for heat stress and making it challenging for people to cool off.
