Original sentence: Emergency Alert System.F number  Wind speed  Damage.F0 and F1 tornadoes are considered "weak" tornadoes, F2 and F3 are classified as "strong" tornadoes, where F4 and F5 are categorized as "violent" tornadoes.Glossary of climate change.Glossary of environmental science.List of climate change topics.List of severe weather phenomena.NOAA Weather Radio All Hazards.NWS Directives System.NWS National Hurricane Center.NWS Southern Region glossary of tropical storm terms.National Weather Service.National Weather Service glossary of terms.National Weather Service, Chicago, IL.National Weather Service, Louisville, KY.Severe weather terminology (Canada).The F scale is based on tornado damage (primarily to buildings), which makes it difficult to rate tornadoes that strike in sparsely populated areas, where few man-made structures are found.The Fujita scale, developed by Ted Fujita, assigns a numerical rating from F0 to F5 to rate the damage intensity of tornadoes.The National Weather Service adopted a new Fujita Scale (the Enhanced Fujita Scale) and went into effect on February 1, 2007.fr:Alerte météorologique.ja:気象警報.†:Beaufort levels above 12 are non-standard in the United States
Edited sentence: EF number  Wind speed  Damage.EF0 and EF1 tornadoes are considered "weak" tornadoes, EF2 and EF3 are classified as "strong" tornadoes, where EF4 and EF5 are categorized as "violent" tornadoes.The EF scale is based on tornado damage (primarily to buildings), which makes it difficult to rate tornadoes that strike in sparsely populated areas, where few man-made structures are found.The Enhanced Fujita Scale went into effect on February 1, 2007.The Enhanced Fujita Scale, an updated version of the original Fujita Scale developed by Ted Fujita, assigns a numerical rating from EF0 to EF5 to rate the damage intensity of tornadoes.†''':Beaufort levels above 12 are non-standard in the United States