"Fujita Tornado Damage Scale"
"Developed in 1971 by T. Theodore Fujita of the University of Chicago"
|| WIND ESTIMATE (MPH)
|| TYPICAL DAMAGE
|| Light Damage. Some damage to chimneys; branches broken off trees; shallow-rooted trees pushed over; sign boards damage
|| Moderate Damage. Peels surface off roofs; mobile homes pushed off
foundations or overturned; moving autos blown off the road
|| Considerable Damage. Roofs torn off frame houses; mobile homes demolished; boxcars overturned; large trees snapped or uprooted; light weighted objects become missiles; cars lifted off the ground
|| Severe damage. Roofs and some walls torn off well-constructed houses; trains overturned; most trees in forest uprooted; heavy cars lifted off the ground and thrown.
|| Devastating damage. Well-constructed houses leveled; structures with weak foundations blown away some distance; cars thrown and large missiles generated.
|| Incredible damage. Strong frame houses leveled off foundations and swept away; automobile-sized missiles fly through the air in excess of 100 meters (109
yards); trees debarked; incredible phenomena will occur.
"IMPORTANT NOTE ABOUT F-SCALE WINDS":
Do not use F-scale winds literally. These precise wind speed numbers are actually estimates of wind speeds after assessing the amount of
and extend of damage to structures in/near the path of a tornado. These wind speeds have never been scientifically verified. Different
wind speeds may cause similar-looking damage on different structures due to the quality of construction. Without a thorough engineering
analysis of tornado damage in any event, the actual wind speeds needed to cause that damage are unknown."