[thread hijack - squawking 7500]
Just to clarify mshoole's previous post...
THE FUJITA-PEARSON SCALE OF TORNADO INTENSITY
F0 Gale tornado (40-72 mph) - Some damage to chimneys; breaks branches off trees; pushes over shallow-rooted trees; damages sign boards.
F1 Moderate tornado (73-112 mph) - The lower limit is the beginning of hurricane wind speed; peels surface off roofs; mobile homes pushed off foundations or overturned; moving autos pushed off the roads; attached garages may be destroyed.
F2 Significant tornado (113-157 mph) - Considerable damage. Roofs torn off frame houses; mobile homes demolished; boxcars pushed over; large trees snapped or uprooted; light object missiles generated.
F3 Severe tornado (158-206 mph) - Roof and some walls torn off well constructed houses; trains overturned; most trees in forests uprooted.
F4 Devastating tornado (207-260 mph) - Well-constructed houses leveled; structures with weak foundations blown off some distance; cars thrown and large missiles generated.
F5 Incredible tornado (261-318 mph) - Strong frame houses lifted off foundations and carried considerable distances to disintegrate; automobile sized missiles fly through the air in excess of 100 meters; trees debarked; steel reinforced concrete structures badly damaged.
F6 Inconceivable tornado (319-379 mph) - These winds are very unlikely. The small area of damage they might produce would probably not be recognizable along with the mess produced by F4 and F5 wind that would surround the F6 winds. Missiles, such as cars and refrigerators would do serious secondary damage that could not be directly identified as F6 damage. If this level is ever achieved, evidence for it might only be found in some manner of ground swirl pattern, for it may never be identifiable through engineering studies.
A key point to remember is this:
the size of a tornado is not necessarily an indication of its intensity. Large tornadoes can be weak, and small tornadoes can be violent.
Source:
http://www.tornadoproject.com/fscale/fscale.htm
Actually, F4 and F5 tornadoes are very rare, and there currently has never been an F6 recorded in history. (The original Fujita scale went up to F10 (with winds at an estimated unbelievable 500-600 mph) but was later revised to the current scale.)
Hurricanes do generate isolated tornadoes, but most are of the F0-F2 classification - the main storm is the one that produces the most damage.
[end thread hijack - squawking 1200]
oh well. anyway, thanks again. Hey what did everyone do for MOM's Day???
Linear Mode
