High Quality Content by WIKIPEDIA articles! The Cincinnati Tornado of April 1999 struck in the early morning hours on April 9, 1999. It killed four people in the Blue Ash and Montgomery, Ohio areas, making it the deadliest tornado to hit the Tri-State since the 1974 Super Outbreak storm killed five in the Sayler Park area. The entire outbreak which started from Nebraska on April 8 produced at least 54 tornadoes across the Midwestern United States and Ohio Valley.