tornado had a path length of 80.3 miles, and has been preliminarily rated at high-end EF-4 with 190

Two EF-5 tornadoes confirmed
Damage surveys have confirmed that last week's April 25 - 28 outbreak spawned at least eleven violent EF-4 tornadoes (winds 166 - 200 mph) and two EF-5 tornadoes (winds greater than 200 mph.) This is only the 5th time since tornado ratings began in 1950 that two top-end tornadoes have occurred on the same day. The last time was on March 13, 1990 in Kansas. An EF-5 with 205 mph winds hit Smithville, Mississippi at 3:44pm EDT on Wednesday. The tornado's path was only 3 miles long, but was 1/2 miles wide and did extreme damage. Fifteen were killed, 40 injured, and 166 buildings destroyed. Some well-built modern 2-story homes that were bolted to their foundations were completely destroyed, leaving only the foundation. This type of damage is characteristic of an EF-5 tornado with 205 mph winds. The Smithville tornado is the first EF-5 tornado in Mississippi since the Candlestick Park tornado of March 3, 1966. The other EF-5 tornado of the day, the Hackleburg tornado, touched down in Northwest Alabama in Marion County at 3pm CDT, and devastated the towns of Phil Campbell and Hackleburg. This tornado killed at least 25 people. Meteorologist Gary Dobbs, with WAAY-TV since 1984, spotted this tornado from his car and was unable to get to his storm shelter. While his house was destroyed around him, Dobbs was thrown 40 feet from the house. The door of the storm shelter blew off, and none of the friends therein were seriously injured. Dobbs required hospitalization. One other tornado that may get an EF-5 rating is the violent Tuscaloosa/Birmingham tornado, which killed at least 66 people and injured over 1000. It was the deadliest tornado in the U.S. since 1955, when 80 people died in Udall, Kansas. This tornado had a path length of 80.3 miles, and has been preliminarily rated at high-end EF-4 with 190 mph winds. The Tuscaloosa-Birmingham tornado is likely to be the most expensive tornado of all-time, and damage from the April 25 - 28 outbreak is likely rank as the most expensive tornado outbreak in history. Insured damages have been rated at $2 - $5 billion, and uninsured losses will be several billion more. The previous most expensive tornado outbreak in history was the $3.5 billion price tag, in 2005 dollars, of the April 3 - 4, 1974 Super Outbreak .

http://www.wunderground.com/blog/JeffMasters/archive.html?year=2011&month=05