Antarctica has never recorded a tornado or a tropical cyclone (hurricane or typhoon).
The air pressure in a tornado is lower than that of its surrounding but the pressure difference varies with the strength of the tornado. The greater the pressure difference, the stronger the tornado. The greatest pressure drop recorded from a tornado was 100 millibars or about 10%.
It is not known for certain, but a likely candidate was the tornado that hit Seneca, Kansas on May 27, 1896. At one point the tornado was 2.2 miles wide. The largest tornado ever recorded was the El Reno, Oklahoma tornado of May 31, 2013, measured at one point to be 2.6 miles wide. This tornado was officially rated EF3 as it was over open country when it reached peak intensity and so caused relatively little damage at that point. Radar analysis, however, suggests that it may have reached EF5 intensity.
The Richter scale is for earthquakes, not tornadoes. Tornadoes are rated on the Enhanced Fujita scale. The largest tornado ever recorded was the 2.6 mile wide monster that hit near El Reno, Oklahoma in 2013. However, size does not necessarily correspond to a tornado's rating. Ratings are based on the severity of the damage a tornado inflicts. The El Reno tornado was officially rated EF3 but there are some indicators that it may have reached EF5 intensity, the highest rating possible.
The most violent tornado and only F5 tornado recorded in the month of August struck Plainfield, Illinois, southwest of Chicago, on August 28, 1990.
Hattiesburg
No. The largest tornado ever recorded hit Hallam, Nebraska in the United States.
The largest tornado in Oklahoma (and in fact the largest tornado ever recorded), was the El Reno, Oklahoma tornado of May 31, 2013. It was 2.6 miles wide.
The largest tornado ever recorded, the Hallam, Nebraska tornado, struck in 2004, so about 6 years ago.
The largest tornado ever recorded was the Hallam, Nebraska tornado of May 22, 2004. At one point this tornado was 2.5 miles wide.
The largest tornado ever recorded was the El Reno, Oklahoma tornado of May 31, 2013. This tornado was 2.6 miles wide. Doppler radar measured a wind gust in the tornado at 296 mph, the second highest wind speed ever recorded in a tornado.
The largest tornado even recorded caused about $160 million dollars in damage, but keep in mind this wasn't the most damaging tornado or the strongest. The tornado with the strongest recorded winds caused $1 billion in damage (about $1.3 billion in today's dollars). The most damaging tornado recorded caused the equivalent of $1.7 billion in today's dollars.
The Waco, Texas tornado of may 11th 1953 killed 114 people and injured 597
The widest tornado ever record, the Hallam, Nebraska tornado, killed 1 person. The strongest tornado ever recorded (fastest winds measured), The Moore F5 of May 3, 1999, killed 36 people. The worst (deadliest) tornado ever recorded, the Daulatpur-Salturia in Bangladesh killed over 1,300 people.
the tornado was recorded in kilbeggan Ireland in Europe on April 30th 1054
The first recorded tornado in the US was in Rehoboth, Massachusetts in August of 1671.
The first recorded tornado occurred near Kilbeggan, Ireland on April 30, 1054.