Locally severe thunderstorms will affect areas across northern Illinois, Wisconsin, Michigan and central Ontario into Friday night.
While not every location will be hit with a thunderstorm, a few communities can be hit hard with damaging wind gusts, large hail, frequent lightning strikes and flash flooding.
Some cities that can be impacted by downed trees, sporadic power outages and travel delays include Chicago and Rockford, Ill.; Milwaukee, Madison and Green Bay, Wis.; Grand Rapids, Alpena and Flint, Mich.; and Sudbury, Ontario.
Spotty, wind-driven downpours can affect motorists along stretches of I-43, I-75, I-90 and I-94.
The storms will be moving along at a swift pace and could catch some people off guard who may be on the lakes or on the roads.
Keep an eye out for rapidly changing weather conditions. Seek shelter indoors as storms approach and never drive through flooded roadways.
During early Saturday, the storms can reach other cities including Indianapolis, Detroit, Toledo, Ohio, and London, Ontario.
The storms are occurring on the northeastern edge of a large dome of heat anchored over the central Plains.
Additional storms are likely through Sunday, before a push of cooler and drier air settles southeastward over the region during Labor Day and Tuesday.
Ahead of an approaching storm system, unseasonable warmth will overspread much of the United Kingdom on Sunday and Monday.
With no exact details on where Malaysia Airlines Flight 370 went missing, Indian Ocean currents may have swept one piece of the complicated puzzle to shores on Reunion Island.
The stream of moisture into the Southwest is drying out some, so this weekend may not be as wet as the previous few days.
Life-threatening heavy rainfall will continue to focus on northeastern India, Bangladesh and western Myanmar into Monday before a drier weather pattern sets in.
Heat and humidity remained in control over the much of the country during the last week of July.
The air felt like an exceptional 163 F in Bandar Mahshahr, Iran, on Friday and similar or worse conditions will follow.
Scituate, MA (1769)
Hail fell 12" deep and remained on the ground for 30 hours.
Cherrapunji, India (1861)
A total of 366.14" of rain fell during July (world record for 1 month). Cherrapunji also holds world record rainfall for a 12-month period: 1,041.78" from August 1, 1860 to July 31, 1861.
Baker, FL (1949)
(East of Crestview, FL) Lightning struck a baseball diamond, digging a ditch 20 feet long in the infield, killing the shortstop, third baseman and injuring 50 people in a crowd of 300.