2025年1月10日 · Moderate tornado 73-112 mph The lower limit is the beginning of hurricane wind speed; peels surface off roofs; mobile homes pushed off foundations or overturned; moving autos pushed off the roads; attached garages may be destroyed.

The old scale lists an F5 tornado as wind speeds of 261–318 mph (420–512 km/h), while the new scale lists an EF5 as a tornado with winds above 200 mph (322 km/h), found to be sufficient to cause the damage previously ascribed to the F5 range of wind speeds.

2025年1月9日 · The EF Scale was revised from the original Fujita Scale to reflect better examinations of tornado damage surveys so as to align wind speeds more closely with associated storm damage. The new scale has to do with how most structures are designed.

The Fujita scale (F-Scale; / fuˈdʒiːtə /), or Fujita–Pearson scale (FPP scale), is a scale for rating tornado intensity, based primarily on the damage tornadoes inflict on human-built structures and vegetation.

Below is a brief description of each type of tornado on the Fujita scale. F0 Tornado. Wind speeds between 40 to 72 mph (64 to 116 km/h) Light damage; Broken branches; shallow rooted trees pushed over; some chimney damage. F1 Tornado. Wind speeds between 73 to 112 mph (117 to 180 km/h) Moderate damage

The Fujita Scale is a well known scale that uses damage caused by a tornado and relates the damage to the fastest 1/4-mile wind at the height of a damaged structure. Fujita's scale was designed to connect smoothly the Beaufort Scale (B) with the speed of sound atmospheric scale, or Mach speed (M).

Its uses three-second gusts estimated at the point of damage based on a judgment of 8 levels of damage to the 28 indicators listed below. These estimates vary with height and exposure. Important: The 3 second gust is not the same wind as in standard surface observations.

The EF Scale takes into account more variables than the original F Scale did when assigning a wind speed rating to a tornado. The EF Scale incorporates 28 damage indicators (DIs) such as building type, structures, and trees.

3 天之前 · However, scientists believed there were two major problems with the original F-scale: Wind speeds: Wind speeds were estimated at 261-318 mph for an F5 tornado. However, several engineering studies ...

The version used today—the Enhanced Fujita Scale—ranges from EF0 tornadoes with winds of 65 to 85 miles an hour, to EF5 tornadoes with winds exceeding 200 miles an hour. The U.S. National Weather Service has rated tornadoes according to the Fujita Scale since 1973. Tornadoes are extremely dangerous.