This article lists various tornado records.The most "extreme" tornado in recorded history was the Tri-State Tornado, which spread through parts of Missouri, Illinois, and Indiana on March 18, 1925.
Top of F12 = Mach 1. Estimated wind speed: Potential damage: mph: km/h: F1: 73–112 : 117–180 : An F1 tornado can tear apart roofs. Severe storms in the High Plains are primarily expected to contain damaging winds and large hail. This Fujita scale ranged from F0 to F5, blending the Beaufort Wind Speed Scale with Mach numbers. At the upper limits of an EF-1 tornado, complete destruction of the roof and walls can occur to a mobile home. NOAA notes that "precise wind speed numbers are actually guesses and have never been scientifically verified. Well-constructed houses leveled; structures with weak foundations blown away some distance; cars thrown and large missiles generated. A tornado with wind speeds greater than 319 miles per hour (513 km/h) is theoretically possible, and the 1999 Bridge Creek-Moore Tornado may have been such an event. Without a thorough engineering analysis of tornado damage in any event, the actual wind speeds needed to cause that damage are unknown. And shatter windows. Mobile homes will be completely destroyed. They can overturn mobile homes and push cars off the road.
On February 1, 2007, this Enhanced Fujita scale replaced the original scale for use in all U.S. tornado damage surveys. Gusty winds, very dry conditions, and areas of dry thunderstorms are producing Critical fire weather threats across the Great Basin, Northern Rockies, and into the Northern High Plains. Without a thorough engineering analysis of tornado damage in any event, the actual wind speeds needed to cause that damage are unknown. Since the Fujita scale is based on the severity of damage resulting from high winds, an F6 or an F7 tornado is a theoretical construct. Roofs torn off frame houses; mobile homes demolished; boxcars overturned; large trees snapped or uprooted; high-rise windows broken and blown in; light-object missiles generated. F6 tornadoes had a wind speed of 300+ mph. A tornado with wind speeds greater than 319 miles per hour (513 km/h) is theoretically possible, and the 1999 Bridge Creek-Moore Tornado may have been such an event. This page documents tornadoes that were unofficially rated F6 or EF6 by TG. A process of The original scale as derived by Fujita was a theoretical 13-level scale (F0–F12) designed to smoothly connect the At the time Fujita derived the scale, little information was available on damage caused by wind, so the original scale presented little more than educated guesses at Furthermore, the original wind speed numbers have since been found to be higher than the actual speeds required to incur the damage described at each category. On February 1, 2007, the Fujita scale was decommissioned, and the Enhanced Fujita Scale was introduced in the United States.Though each damage level is associated with a wind speed, the Fujita scale is effectively a damage scale, and the wind speeds associated with the damage listed aren't rigorously verified. The highest recorded wind speed for a tornado is 301 mph … Standard measurements are taken by weather stations in open exposures, using a directly measured, "one minute mile" speed.The NWS is the only federal agency with authority to provide 'official' tornado EF Scale ratings.
CrazyC83 19:25, 28 October 2005 (UTC) I found the wind-speed numbers for the rest of the categories : F7 - 380-440 mph The new scale more accurately matches wind speeds to the severity of damage caused by the tornado.
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