Wind estimation techniques (mph)
1-3Flag angle:
Vegetation: tall dry grass
Mirage: boiling
Sensation: barely felt
3-5 Flag angle: 15
Vegetation: large leaves
Mirage: 30 degrees
Sensation: felt on face
5-7 Flag angle: 30
Vegetation: small leaves
Mirage: 45 degrees
Sensation:
7-9 Flag angle:
Vegetation: short needle trees
Mirage: horizontal, wavy
Sensation:
9-12 Flag angle: 45
Vegetation: brush & trees
Mirage:
Sensation:
15 Flag angle: 60
Vegetation:
Mirage:
Sensation:
20 Flag angle: 90
Vegetation:
Mirage:
Sensation:
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