1761: Large tornadoes swept through the harbor at Charleston, South Carolina when a British fleet of 40 sails was at anchor. The tornadoes raised a wave 12 feet high, leaving many vessels on their beam ends. Four people drowned.
1868: A tornado traveled 15 miles across Warren and Knox Counties, northwest of Galesburg, Illinois. The small town of Ionia, in Warren County, was destroyed. 16 homes and two churches in the town were leveled, along with 30 homes elsewhere. The tornado killed six people and injured 40 others. Many of the casualties occurred during a church service when the church roof was torn off and dropped onto the congregation.
1895: In Sioux County, Iowa an extremely violent tornado, at times 1,000 yards wide packing winds estimated at over 250 mph moved from three miles north of Ireton to two miles southwest of Hull hitting four schools. Two school houses several miles apart were leveled, killing teachers and students. Sibling teachers were killed at two different schools. Adjoining farms were also entirely destroyed with several deaths in homes.
1999: There were 63 tornadoes in Oklahoma, making this the worst outbreak ever to strike the state. In Central Oklahoma alone, eight individual supercell thunderstorms produced 57 tornadoes. Bridge Creek, Moore and southern parts of the Oklahoma City Metro area were hit the hardest. When it was near Moore, Oklahoma, a truck-mounted Doppler radar measured a wind speed of 318 mph, the highest ever observed in a tornado. Forecasters at the Storm Prediction Center in Norman, OK were faced with the unprecedented situation of a major tornado on the ground threatening their location. As a major F5 tornado was approaching the Oklahoma City metro area from the southwest, the SPC notified its backup, the Air Force Weather Agency at Offutt AFB in Omaha, Nebraska that they might have to assume operational responsibility if the tornado approached Norman. The storm remained several miles west of the facility but was visible from the SPC roof. Damage from this single tornado was around one billion dollars, making it the most costly tornado in history. Estimated damage from the entire tornado outbreak was $1.485 billion dollars, making this the most expensive tornado outbreak ever. 2,314 homes were destroyed, and another 7,428 were damaged. To the north in Kansas, an F4 tornado tracked 24 miles through Sumner and Sedgwick Counties, killing 6, injuring 154, and causing $146 million in damages. Haysville and Wichita suffered severe damage. A total of 8,480 buildings and homes were damaged or destroyed with, 109 totally destroyed.
— U.S. Tornadoes (@USTornadoes) May 3, 2017
Source: NWS Office in Norman, Oklahoma.
— Ryan Vaughan (@ryanvaughan) May 3, 2017