A major shift in the weather pattern will drive a blast of cool air southeastward from Canada across the Plains, Midwest, East and South into the weekend.
The blast of air from the Canada Prairies will drive temperatures and humidity levels down all the way to Texas and eventually much of the Atlantic Seaboard.
Temperatures may struggle to top 70 around Chicago both days of the weekend.
As the cooler air blasts across the warm waters of the Great Lakes, waterspouts are likely to spin up this weekend.
In Texas, the 100-degree heat from much of this summer will be replaced by highs in the 80s with much lower humidity in such cities as Dallas, San Angelo and Houston.
In the central and northern Appalachians, in the wake of the front which marks the leading edge of cooler air, the coolest spots could have highs near 60 on Sunday.
In the Deep South, for the folks who have been enduring tropical heat and humidity this week while cleaning up after Isaac, highs in the 80s with low humidity and sunshine will settle in later this weekend into next week.
While the magnitude of cooling will be less pronounced in much of the East's I-95 corridor, humidity levels will be shaved substantially and highs will be in the 70s by early next week from Boston to New York City and Washington, D.C.
The blast of cooler air and refreshing humidity will be preceded by rounds of showers and thunderstorms, which can lead to flash flooding and localized severe weather.
The downpours and severe weather will hit portions of the Midwest Friday then the Deep South and Atlantic coast into the weekend.
In addition, folks in portions of Florida may have to deal with a weak tropical system, such as a tropical depression or tropical storm and its torrential downpours this weekend. The feature could come about of a cluster of thunderstorms over the northern Gulf of Mexico, which are part of the old remains of Isaac.
As cooler air drives into the eastern U.S. this weekend, a compensating northerly flow over the Atlantic Ocean may help drive Hurricane Leslie into Atlantic Canada early next week.
The coldest air of the season so far and some snow will pour into the northwestern United States by early next week.
Arctic air settling over Germany may prompt children to leave their shoes for St. Nicholas indoors instead of outside before going to bed on Monday night.
A deadly wildfire exploded in Tennessee this week, charring a popular resort town and causing devastating damage.
On the heels of Cyclone Nada, a new and more significant tropical cyclone threatens to take aim at India next week.
Dashing hopes for Christmas Day snowmen and white rolling hills, forecasters predict Britain's weather pattern will leave more to be desired on Dec. 25.
Rounds of heavy rain will heighten the risk for flash flooding across portions of the southern United States through the weekend.
As colder air sweeps into the northeastern United States, temperatures will settle to seasonable levels, and lake-effect snow will erupt into Saturday night.
Thousands of firefighters from across the country answered the call to help save the South, not just on the front lines but also back in camps supporting those out among the flames.
A tranquil beginning to December will be replaced by unsettled weather ahead of the holidays.