The largest tornado on record in the U.S. varied in speed. For the early part of its time on the ground it traveled at about 30 mph before suddenly accelerating to 55 mph.
Offically, the largest tornado on record struck near El Reno, Oklahoma on May 31, 2013. Radar and later damage surveys showed the tornado to be 2.6 miles wide.
That would be the El Reno, Oklahoma tornado of May 31, 2013. At peak size the tornado was 2.6 miles wide.
The most destructive tornado in U.S. history was the Joplin, Missouri tornado of May 22, 2011. The cost of damage was $2.8 billion.
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The largest tornado on record actually occurred in 2004, hitting the town of Hallam, Nebraska. A major tornado outbreak occurred in the southern U.S. in 1932, primarily affecting Alabama and Georgia, but none of the tornadoes were noted for record or near record size.
About as far as a US airliner to Russia. They will follow about the same ground track.
The highest death toll of any recorded tornado in the U.S. is 695. This is from the Tri-State tornado of Mach 18, 1925. However, scientists have estimate that an extremely large, violent tornado that impacts a major city or crowded freeway could potentially kill thousands.
The largest track by physical size is open to personal opinion. Greyhound race tracks in the United States are supposed to be uniformly 1/4 mile in circumferance, so there is no "largest" by track length. However, Southland Greyhound Park is believed to be slightly larger than 1/4 mile The largest track by parimutuel handle is Palm Beach.
Tornado Alley
The largest Indian burial ground in located in Snow Hill, North Carolina. The exact number is not completely known but it is the largest. East Carolina University did a dig there in the 90s and found it.
That can have several answers. The strongest (though not necessarily the largest) tornadoes are EF5 tornadoes with estimated winds over 200 mph. The strongest tornado recorded (or at least to have its wind speed measure) had winds of 318 (some say 302) mph. The widest tornado ever recorded struck Hallam, Nebraska tornado in 2004. It was 2.5 miles wide.