April 17 edit
1970: A multi-day tornado outbreak began in the southern High Plains of the United States, including 3 F4 tornadoes in the Texas Panhandle that killed 6 people.
1979: Flooding along the Pearl River in Jackson, Mississippi crested at 43.28 feet (13.19 m), exceeding the previous record by more than 5 feet (1.5 m).