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F0 (40 - 74 mph)    Light Damage

Some damage to chimneys; break branches off trees; push over shallow rooted trees or down rotten trees; damage to signs and billboards; light-weight awnings and canopies damaged.
F1 (75-112 mph)    Moderate Damage
Peel surface off roofs (large sections of shingles removed from roof corners and eaves); home chimneys collasped; mobile home pushed off foundations or overturned; moving automobiles pushed off road; windows broken by flying debris.
F2 (113-157 mph)    Significant Damage
Sections of roof and porches damaged, especially if inadequately anchored; large sections of gabled roofs may be torn off on leeward side; car port roofs lifted; extensive damage to garage roofs, if door is on windward side; mobile homes demolished; boxcars pushed over; large trees snapped or uprooted; light-object missles generated.
F3 (158-206 MPH)   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 a sizeable distance.
F4 (207-260 mph)    Devastating Damage
Well constructed houses leveled; structures with weak foundations blown some distance; cars thrown and large missles generated.
F5 (261 and greater)    Incredible Damage
Strong frame houses lifted off foundations and carried considerable distance to disintegrate; automobile-sized missles fly through the air for hundreds of yards; trees debarked.


National Weather Service
Weather Forecast Office Baltimore/Washington
43858 Weather Service Rd.
Sterling, VA 20166
Phone: (703) 996-2200
Page last modified: December 28, 2005 8:55 AM
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