Parts of the South will get major relief from heat, humidity and storms this week while other locations will be at greater risk for flash flooding.
A piece of the polar vortex, albeit summer version, will drop into the Midwest this week. As it does, a push of cooler, less humid air will bulge southward, reaching portions of the northern Plains, Mississippi Valley and Appalachians.
According to AccuWeather Meteorologist Mark Mancuso, "The cool air will push unusually far south for the middle of July."
Nashville, Tennessee, will join other parts of the Tennessee and Ohio valleys in having temperatures dip to record territory.
Temperatures can drop into the upper 50s in some of these cities, where average lows for this time of the year range from the upper 60s to lower 70s.
The leading edge of the cool air, known as a front, will stall over portions of Texas to the central Gulf Coast and the southeastern corner of the United States during the middle and latter part of the week.
The front will be a focusing point for rounds of drenching showers and thunderstorms.
"The greatest risk for repeating rainfall and flash flooding will occur in parts of Texas, Florida, the coastal Carolinas and southeastern Georgia," Mancuso said.
Rainfall along portions of the southern Atlantic Seaboard can approach 6 inches over a several-day stretch with locally higher amounts possible. In a few locations, enough rain can fall to cause serious flash and urban flooding.
Cities in the southeastern corner of the U.S. that are at greatest risk for flash flooding in the upcoming pattern include Norfolk, Virginia; Wilmington, North Carolina; Charleston, South Carolina; Savannah, Georgia; and Jacksonville, Florida.
Episodes of heavy rain over portions of Texas, the southern High Plains and Rockies is much needed in parts of the region remain in excessive drought.
Some cities in the region that can be hit with heavy rainfall on one or more occasions include Dallas and Amarillo, Texas; Oklahoma City; Roswell, New Mexico; and Pueblo, Colorado.
However, the rain may fall too hard and too fast for the ground to absorb, which can lead to dangerous flash flooding. Some streams that have been dry for months may turn into raging torrents in a matter of minutes.
At least 20 people have died in West Virginia as a result of extreme flooding that inundated portions of the state on Thursday.
On the heels of Danielle, another weak tropical system will move onshore from the Gulf of Mexico with drenching downpours and the risk of flash flooding.
The risk of thunderstorms and severe weather will return to the north-central United States this weekend, including some areas that were hit by violent storms on Wednesday.
Portions of North and South Carolina will face the threat for heavy thunderstorms that could turn severe into Friday evening.
Showers threaten to cause delays on a nearly daily basis next week at the 2016 Wimbledon Championships.
After dealing with heavy thunderstorms and heat to start the weekend, Germany will welcome more seasonable temperatures and fewer downpours early next week.
New York, NY (1975)
A Boeing 727 crashed on a landing approach to JFK. Believed to be caused by a "microburst" from a thunderstorm, the crash killed 112, and injured 12 others.
Unseasonably chilly. High temperatures: Buffalo, NY 60 Jamestown, NY 53 Erie, PA 57 Dubois, PA 55 Pittsburgh, PA 63 Youngstown, OH 56
Scranton, ND (1991)
3.50" of rain in 28 minutes along with 1.5 foot drifts of marble-sized hail. Front end loaders were needed to clear the streets.