Humidity, sweltering heat and the threat for lightning will impact the Northeast NFL preseason games through Saturday.
A high pressure system off the Southeast coast is pumping the heat and humidity into the Northeast.
This will create very uncomfortable conditions for Thursday evening games from Baltimore to Foxboro, Massachusetts.
The New England Patriots, Philadelphia Eagles, Baltimore Ravens and New York Jets will host the first preseason games of 2016 on Thursday evening.
"AccuWeather RealFeel temperatures will be in the 90s for kickoffs," AccuWeather Meteorologist Evan Duffey said.
The humidity will be oppressive, making it very challenging to stay cool.
Staying hydrated will be the most important factor for both fans and players before, during and after the games.
In addition to the heat and humidity, thunderstorms will dot the region, especially in the corridor from Philadelphia to Boston early Thursday night.
"Lightning delays cannot be ruled out, but they are unlikely," Duffey said.
Similar conditions will continue Friday and Saturday with additional games in the region.
The Detroit Lions will meet the Pittsburgh Steelers Friday evening, while farther east, the Miami Dolphins take on the New York Giants in East Rutherford, New Jersey.
Thunderstorms will be prevalent around the Pittsburgh and New York City area on Friday, but they will become more isolated in the evening.
On Saturday, the Indianapolis Colts will be at Ralph Wilson Stadium to take on the Buffalo Bills where a lightning delay will be possible.
Any delays will generally be brief and toward the beginning of the game.
Fans should heed all weather warnings announced during the games. Tailgaters should monitor changing skies and seek shelter upon hearing thunder or seeing lightning in the distance.
Most thunderstorm activity will tend to diminish toward the late-evening hours and second half of the games," Duffey said.