Big changes are in store for millions of Americans in the eastern half of the U.S. as temperatures skyrocket into record territory this weekend.
Temperatures of 20 to 30 degrees above average are expected across the region, with many areas seeing highs in the 90s from the mid-Atlantic and Ohio Valley into the Northeast and New England.
A Bermuda High is building off the East Coast, and that will transport all the heat and humidity that has been building in the southern U.S. over the past two weeks to the north and east.
A Bermuda High is a ridge of high pressure that becomes anchored in the Atlantic Ocean near Bermuda and usually lingers in the region for most of the summer. That area of high pressure can also affect the track of hurricanes if and when they develop in the ocean.
In terms of this weekend's forecast, the Northeast and New England will remain slightly below average on Thursday as the warm air begins to build in from the west.
Friday is when the heat really gets cranking in that region.
Most of the extreme heat will be confined to the Ohio Valley and mid-Atlantic as the weekend gets underway.
Pittsburgh and Washington will see temperatures in the lower 90s, while places to the north and east, like Buffalo, New York, New York City and parts of northern New England, will remain in the 70s to near 80 degrees.
Bangor, Maine, will remain cool with a high temperature of around 63 degrees.
Saturday is when the heat will become extremely dangerous across the region.
Washington has a good chance of getting very close to 100 degrees, as does Boston and parts of interior New England.
Cooler temperatures will be confined to the coast, but the farther inland you go, the warmer the temperatures will become.
Every marker you see on the map above is a location that has a very good chance of breaking a record on Saturday – and there are dozens of them.
Philadelphia is expected to get to around 98 degrees on Saturday, with Washington right behind with a forecast high of 97 degrees.
Richmond, Virginia, will get very close to 100 degrees, and temperatures will be in the mid- to upper 90s across Massachusetts, Connecticut and Rhode Island.
It's very early for excessive heat to affect the region, so anyone living and working in the Northeast and New England should monitor conditions and take precautions now to ensure you can stay cool as the heat rises.