2/3 Of Americans Will Experience A Week Of Extreme Heat & Humidity Starting Friday June 20th

[hatrack]

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 this 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.

Temperatures are forecast to exceed 90 degrees for around 220 million people across the country. Temperatures may reach or exceed 100 degrees for an additional 35 million people next week, including those living in the Northeast and Mid-Atlantic.

Unusually high humidity and temperatures will cause widespread, dangerous heat indexes. As of early Thursday, extreme heat watches, warnings and advisories cover the Southwest, Rockies, Plains, Upper Midwest and parts of the Northeast — these alerts will probably expand in the days ahead.

EDIT

https://www.washingtonpost.com/weather/2025/06/19/maps-extreme-heat-humidity-forecast/

[Jerry2144]

1. I wish temperatures were back down into the 90s

It’s been 105+ here in Vegas this past week or so. Our humidity is low, 5-10%, about the same as the Felon’s ranking on the global smarts scale