C.V.T. Wind Indicators  



Wind SpeedTactile and Visual Indicators
0-1 MPH Wind imperceptible
No grass or leaf movement
Smoke rises straight up
Mirage runs vertical
1-2 MPH Cooling effect of wind may be noticed
Light movement of grasses
Only a few leaves on any given tree in motion
Mirage begins to lean to 12:30
3 MPH Wind pressure can be felt on bare arms
Grasses obviously in motion
All leaves on any given tree in light motion
Mirage leans to 1:00-1:30
4 MPH Wind pressure can be felt on face
Small twigs bearing leaf clusters begin light motion
Mirage leans to 1:30-2:00
5 MPH Tips of smaller branches begin motion
Mirage leans to 2:00-2:15
6 MPH Tips of branches begin motion
Mirage leans to 2:15-2:30
7 MPH Larger (trunk) limbs begin motion
Young (softer) leaves begin to flip over on windy side of trees
Mirage leans to 2:30
8 MPH Tree tops are in light motion
Mature leaves flip over on windy side of trees
Mirage leans to 2:45
9 MPH Tree tops show obvious movement
Mature leaves flip over on windy side of trees
Mirage leans to 2:45-3:00 and begins to run
10 MPH Wind pressure can be felt against the body
Tree tops show substantial movement
Mirage runs slowly and parallel to ground
11 MPH Mirage runs quickly along the ground, begins to break up
12 MPH Wind pressure can be felt against the body
Mirage runs very quickly in sheltered places, mostly broken up in exposed areas
12-15 MPH Dust is raised
Lighter debris moves around
Mirage blows off completely in exposed areas
15-20 MPH Dust clouds blow around
Debris blows around
Smaller tree trunks sway
Major limbs on larger trees in constant motion
20+ MPH Difficulty walking
Larger tree trunks sway



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