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The 1977 Birmingham–Smithfield F5 tornado's damage was surveyed by Ted Fujita and he "toyed with the idea of rating the Smithfield tornado an F6". [13] In 2001, tornado expert Thomas P. Grazulis stated in his book F5–F6 Tornadoes; "In my opinion, if there ever was an F6 tornado caught on video, it was the Pampa, Texas tornado of 1995". [14]
The scale has the same basic design as the original Fujita scale—six intensity categories from zero to five, representing increasing degrees of damage. It was revised to reflect better examinations of tornado damage surveys, in order to align wind speeds more closely with associated storm damage.
Tornadoes of 1912. Tornado outbreak of April 20–22, 1912; Tornado outbreak of April 27–29, 1912; Tornadoes of 1913. 1913 Easter tornado outbreak; Tornadoes of 1916. Tornado outbreak of June 5–6, 1916; Tornadoes of 1917. March 1917 tornado outbreak; Tornado outbreak sequence of May 25 – June 1, 1917; Tornadoes of 1918. 1918 Tyler tornado ...
This scale helps categorize each tornado by its intensity and its area, and can estimate the wind speeds associated with the damage caused by the tornado. The EF scale are divided into six categories:
Tornadoes can occur anywhere in the U.S., according to the National Weather Service.Tornadoes are “most common in the central plains east of the Rocky Mountains and west of the Appalachians.”
The deadliest hurricane-spawned tornado was in October 1964, when 22 people died in Larose, Louisiana, during a twister from Hurricane Hilda. How a hurricane's tornadoes are different
Violent tornadoes are extremely rare outside of the United States and Canada. F5 and EF5 tornadoes are rare. In the United States, they typically only occur once every few years, [14] and account for approximately 0.1 percent of confirmed tornadoes. [15] An F5 tornado was reported in Elie, Manitoba, in Canada, on June 22, 2007. [16]
Severe weather triggered tornadoes in parts of Iowa on April 16, just weeks before May, the month that will have the highest risk for tornadoes in Iowa this year due to a change in weather patterns.