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The Enhanced Fujita Scale is used to assign tornadoes a rating based on estimated wind speeds and damage.
The EF Scale became operational on Feb. 1, 2007. It was revised from the original Fujita Scale, developed in 1971 by Tetsuya Fujita, to better reflect wind speed with damage observed in tornado surveys.
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An unusually potent storm for late August will cause gusty winds and rough waters around the Great Lakes region through the middle of the week.
A change in the weather pattern will allow a long stretch of hotter weather with drier conditions, when compared to much of the summer.
After grazing southern Japan at midweek, Typhoon Soulik is on track to sweep across the Korean Peninsula through Friday.
Se sospecha que la deforestación contribuyó al misterioso colapso de la civilización maya hace más de 1,000 años.
A year after Hurricane Harvey, there are parts in Texas still recovering as relief efforts continue to distribute funds throughout the state.
Major Hurricane Lane is forecast to close in on Hawaii and threaten lives and property on the islands due to pounding surf, flash flooding, mudslides and strong winds.
Nearby heavy rain flooded a narrow creek canyon popular among tourists in southern Italy, killing at least 10 people on Monday.
Known as Phos-Chek, the fire retardant has been used to fight blazes since 1963.