Taken from TWV Wiki: (added by me)
1925
March 18, 1925- States affected: MO/IL/IN Tri-State trnado. Missouri, Illinois and Indiana tornado. Possible the only tornado to ever move across 3 different states. This is possibly one of the strongest tornadoes ever recorded and was on the ground for 3.5 hours. This tornado formed in MO and then traveled to IN injuring 2000 people and killing a total of 695 people a possible record for a single tornado. It traveled 219 miles, destroyed 4 towns completely and left 6 more severely damaged and destroyed 15,000 homes. Annapolis MO 90% destroyed. Gorham IL was 100% destroyed. Murphysboro IL was 40% destroyed. Desoto IL was 30% destroyed. West Frankfurt IL was 20% destroyed. Parrish IL 90% destroyed. Griffin IN 100% destroyed. 85 farms destroyed after this in IN. The tornado finally dissipated near Princeton IN. Over 15,000 people injured or killed in just 40 minutes. The town of Parrish was never rebuilt and in Murphysboro one witness said he saw the tornado pick a house up and then watched it explode and others had similar stories. Reasons why this could be the worst tornado in history for the US: longest continuous contact on the ground, third fastest traveling speed, continuous exertion of force resulting in damage throughout most of its lifespan, a 3.5-hour duration giving the tornado of May 26, 1917 a run for it's money.
1947
April 9, 1947- States affected: TX/OK/KS Possibly the second Tri-State tornado. A supercell formed in the texas panhandel during the afternoon and traveled 220 miles from White Deer, TX (northeast of Amarillo) to St. Leo, KS (west of Wichita). A tornado formed near canadian TX and would later strike Woodward OK and it travled 100 miles. The towns of Glazier and Higgins in TX were both devestated by the tornado as it moved at 50 MPH. 69 fatalities in TX. In Ellis County, Oklahoma, the tornado did not strike any towns, passing to the southeast of Shattuck, Gage, and Fargo. Even though no towns were struck, nearly 60 farms and ranches were destroyed and 8 people were killed with 42 more injured. In Woodward county 1 death was reported. This violent F5 tornado then hit Woodward destroying alot of the town and over 100 city blocks were destroyed. Atleast 107 people killed and another 1000 injured. The bodies of three children were never identified, and one child who survived the tornado was lost and never reunited with her family. 36 homes were destroyed in Woods County with 30 people injured. Althought people believed the tornado continued into KS later study showed this could have been a differint tornado in a family of 5-6 tornadoes that occured with this storm.
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