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1968: A severe thunderstorm moved into the path of a Braniff Airlines plane between Houston and Dallas, TX. The plane got caught in hail and severe turbulence. The aircraft broke up in mid-air, resulting in 85 casualties.
1999: In less than 48 hours, a total of 76 tornadoes touched down across Oklahoma. An F5 tornado tracked for 40 miles, skirting south of Oklahoma City through the communities of Moore and Chickasaw. The tornadoes killed 42 people and caused $1 billion in damage. It was the NWS's first use of "tornado emergency" wording in its Tornado Warnings.