Original sentence: On August 4 at 9:25am EST a major thunderstorm coming from the northwest at the leading edge of a cold front moving across the American Midwest causing a Flood stuck Louisville, Kentucky, a city of 650,000 residents, producing large hail and winds in excess of 60 mph (85 kph)
Edited sentence: On August 4 at 9:25am EST a major thunderstorm coming from the northwest at the leading edge of a cold front moving across the American Midwest causing a flash flood stuck Louisville and portions the surrounding Kentuckiana region producing large hail and winds in excess of 60 mph (85 kph)