“The warm, smothering embrace of a high-amplitude ridge will continue into the long term period,” says Kyle Theim, a meteorologist at the National Weather Service (NWS) office in Atlanta. “Temperatures starting on Monday will run between 10-15 degrees above normal, and border on record maximum temperatures, both for daily highs and lows.”
More than 70 daily heat records may be broken from Sunday through Wednesday, as a high-pressure system dominates the eastern half of the country. Some cities such as Atlanta, Nashville, Baltimore, and Montgomery, Alabama are forecast to have multiple days of record heat.
There will be a brief break for about two days in some mid-Atlantic and Northeast cities.
However, as quickly as the heat retreats, it comes right back again.
Boston goes from the low 90s Sunday, down to 60s and 70s Monday and Tuesday, then right back up to the 90s again on Wednesday. Washington, DC, Philadelphia, and New York will experience a similar temperature roller coaster.
Boston, New York, Knoxville, and Lexington, Kentucky typically see their first 90-degree day after June 1. However, each of these cities will see those temperatures at least once over the next five days. Washington, DC, is forecast to have multiple days above 90 degrees, including Wednesday, which is forecast to hit 97. Their first average 95 or higher degree day doesn’t usually arrive until June 21.