A strengthening storm system will produce a major severe weather outbreak over the Plains Saturday. In Chicagoland, storm-related problems may be two-pronged.
The developing storm system marks an end to the tranquil weather being experienced over much of the nation in recent weeks.
During Saturday, building warmth over the Plains will contribute to severe thunderstorms from Iowa to north-central Texas. The risks from the storms include damaging wind gusts, large hail, flash flooding and a few tornadoes.
The storm will rout out chilly air during Saturday in Chicago. However, the process is likely to unleash areas of very heavy rain and thunderstorms. There is a risk of flash and urban flooding problems with the greatest chance across the northern suburbs into Milwaukee.
Building warmth to the south on Saturday can reach into Chicagoland for a time Saturday night. If it is successful, there will be an elevated risk of violent thunderstorms late Saturday night into Sunday morning.
The storms could still pack enough punch moving in from the Plains to bring 55-mph wind gusts, which can knock down tree limbs and cause sporadic power outages as a result.
During the balance of Sunday, a strong flow of air on the storm system's back side will make for a windy day. Frequent gusts between 30 and 40 mph are possible. Enough dry air may come in from the west to end the showers and allow clouds to break during the afternoon.
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.
At least 23 people have died in West Virginia as a result of extreme flooding that inundated portions of the state on Thursday.
Another round of sizzling heat threatens to aggravate the ongoing wildfire situation across the southwestern United States through early week.
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.
Anchorage, AK (1953)
86 degrees -- record high for city.
Ohio Valley, Lower Great Lakes (1988)
Extreme Heat: Location: High Temperature(F): Canton, OH 100 Erie, PA 100 Milwaukee, WI 100 Pittsburgh, PA 98 (June record) Youngstown, PA 99 (hottest so early in season) Buffalo, NY 96 Toledo, OH 104 (June record) Detroit, MI 104 (June record tied) Chicago, IL 103 Cleveland, OH 104 (all-time record) Ft. Wayne, IN 106 (all-time record tied) South Bend, IN 104 (June record) Cincinnati, OH 102 Dayton, OH 102 (June record) Evansville, IN 101 Indianapolis, IN 102 (June record tied) Lexington, KY 101
Tupelo, MS (1991)
Flooding downpours: 1.25" or rain in 15 minutes; water reached the level of car windows in the street.