Cooler air moved in to start the week in Philadelphia, but another surge of warmth is on the way.
This cooler air made its way into the region after a front swung through late on Sunday.
More fall-like temperatures spread across the Northeast, dropping highs to 76 degrees on Monday. Some spots in northern New England even struggled to climb out of the 60s.
However, things will heat up again Tuesday, as the cool air slides off into the northern Atlantic. This will allow warmer temperatures to push up from the South.
According to Northeast Weather Expert Dave Dombek, "The last time Philadelphia hit 90 degrees was on July 21, but the city will hit 90 this week, ending the more than seven-week stretch."
Dombek added that with the weather pattern this week and the lack of rain in many locations over the past couple of weeks, temperatures could over achieve.
"Like a desert, when the ground is dry, more of the sun's energy goes into heating the ground, rather than evaporating moisture," Dombek said, "A number of locations can have multiple days with highs in the 90s as a result."
According to Climatologist Jim Rourke, "During the summer of 1984, the last time the temperature reached 90 degrees at the airport was on July 11 and it never hit 90 for the balance of the season."
Along with the heat this week will come moderate to high humidity, which combined with sunshine and other conditions will drive RealFeel® temperatures to near 100 degrees for a few hours during the afternoon.
Gusty thunderstorms will target the northeastern United States on Monday, but will fail to sweep away the heat wave baking the region.
Dangerous heat will surge northward and send temperatures rising across the northwestern United States this week.
Downpours will spread from the lower Mississippi Valley to eastern and central Texas early this week, delivering needed rain but raising the concern for flash flooding.
A renewed risk of severe weather will threaten portions of the north-central United States early this week.
Much of Germany will get a shower or thunderstorm during the midweek as unsettled weather continues.
Thousands of structures, including a wildlife refuge home to more than 400 animals, are threatened by the Sand Fire in Southern California.
Washington, DC (1991)
A total of 3" of rain from heavy thunderstorms.
Manchester, KY (1992)
A state trooper was stranded in his patrol car after it was submerged by flood waters.
Alexandria, NE (1992)
8.0" of rain with severe flooding.