BEAUFORT SCALE: 
Specifications and equivalent speeds for use on land
1.	 FORCE  EQUIVALENT SPEED   DESCRIPTION      SPECIFICATIONS FOR USE ON LAND
     10 m above ground
     miles/hour  knots
0       0-1      0-1      Calm             Calm; smoke rises verticall.
1       1-3      1-3      Light air        Direction of wind shown by
                                           smoke drift, but not by wind
                                           vanes.
2       4-7      4-6      Light Breeze     Wind felt on face; leaves
                                           rustle; ordinary vanes moved
                                           by wind.
3       8-12     7-10     Gentle Breeze    Leaves and small twigs in
                                           constant motion; wind extends
                                           light flag.
4      13-18    11-16     Moderate Breeze  Raises dust and loose paper;
                                           small branches are moved.
5      19-24    17-21     Fresh Breeze     Small trees in leaf begin to
                                           sway; crested wavelets form on
                                           inland waters.
6      25-31    22-27     Strong Breeze    Large branches in motion;
                                           whistling heard in telegraph
                                           wires; umbrellas used with
                                           difficulty.
7      32-38    28-33     Near Gale        Whole trees in motion;
                                           inconvenience felt when walking
                                           against the wind.
8      39-46    34-40     Gale             Breaks twigs off trees;
                                           generally impedes progress.
9      47-54    41-47     Severe Gale      Slight structural damage occurs
                                           (chimney-pots and slates removed).
10     55-63    48-55     Storm            Seldom experienced inland; trees
                                           uprooted; considerable structural
                                           damage occurs.
11    64-72     56-63     Violent Storm    Very rarely experienced;
                                           accompanied by wide-spread damage.
12    73-83     64-71     Hurricane                        --

Fujita Scale 
F-Scale Number
	Intensity Phrase
	Wind Speed
	Type of Damage Done
	
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 fores 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 re-inforced 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