In the wake of the mild air that has been sitting over much of the eastern half of the nation over the past few days, colder weather will move in for the end of the week.
This surge of cold air will be a piece of the polar vortex breaking off and coming southward.
The cold air will begin to push into the northern Plains and Great Lakes on Thursday and will continue to push south and east, reaching the East Coast by the weekend.
This time around, the cold will not be nearly as bitter as the cold wave that smashed records in places early last week. During that stretch, many places had temperatures that were 30 to 40 degrees below average.
This blast of colder air will produce temperatures that are closer to 10 degrees lower than average. Many places along the I-95 corridor will still have highs near or above freezing at the peak of the chill this weekend.
"This next main arctic blast will not rival, nor will it be as extensive as the event last week," AccuWeather.com Lead Long-Range Forecaster Paul Pastelok said.
Even so, the air mass will be cold enough to allow temperatures to drop below zero at night from Minnesota into northern Wisconsin.
With temperatures this low, it's crucial to limit time outdoors and make sure to cover exposed skin to prevent hypothermia and frostbite.
As this piece of the polar vortex starts to move away, temperatures will begin to rebound by Sunday across the Great Lakes. In the East, temperatures will start to bounce back on Monday.
However, additional waves of cold air will follow.
According to AccuWeather.com Senior Meteorologist Alex Sosnowski, "The polar vortex will act like a giant pinwheel or anchor for waves of cold air and clipper storms from the Upper Midwest to the Northeast through the second half of the month."
The risk of flooding downpours and gusty thunderstorms will increase across southern Florida as a tropical disturbance shifts northwestward from Cuba this weekend.
Slow-moving and repetitive downpours will raise the risk for flash flooding along the western Gulf Coast into early week.
Typhoon Lionrock is poised to make landfall in Japan early in the new week with heavy rainfall, damaging winds and an inundating storm surge.
Hawaii is facing two tropical threats this week as Madeline and Lester churn westward.
Hot and dry weather will greet fans and competitors at the 2016 U.S. Open Tennis Championships in Flushing, New York, as play begins Monday, Aug. 29.
Brief relief from heat and humidity will arrive in the northeastern United States at the start of September.
Pennsylvania & New Jersey (1971)
Tropical Storm Doria caused severe floods in southeastern PA and NJ. Damage estimated at $138 million.
Colorado Springs, CO (1978)
Hail 6 inches deep.
Rochester, MN (1979)
2.73 inches of rain fell in 50 minutes making this the wettest August on record. (9.52 inches of rain so far this month). The heavy downpour flooded the streets of Rochester, stranding about 1,500 cars.