JLG 860SJ Operator Manual - Manual (Page 19)

SECTION 1 - SAFETY PRECAUTIONS
3121630 – JLG Lift – 1-9
DO NOT OPERATE THE MACHINE WHEN WIND CONDITIONS EXCEED 28 MPH (12.5 M/
S).
Table 1-2. Beaufort Scale (For Reference Only)
Beaufort
Number
Wind Speed
Description Land Conditions
mph m/s
0 0 0-0.2 Calm Calm. Smoke rises vertically
1 1-3 0.3-1.5 Light air Wind motion visible in smoke
2 4-7 1.6-3.3 Light breeze Wind felt on exposed skin. Leaves rustle
3 8-12 3.4-5.4 Gentle breeze Leaves and smaller twigs in constant motion
4 13-18 5.5-7.9 Moderate breeze Dust and loose paper raised. Small branches begin to move.
5 19-24 8.0-10.7 Fresh breeze Smaller trees sway.
6 25-31 10.8-13.8 Strong breeze Large branches in motion. Flags waving near horizontal. Umbrella use
becomes difficult.
7 32-38 13.9-17.1 Near Gale/Moderate Gale Whole trees in motion. Effort needed to walk against the wind.
8 39-46 17.2-20.7 Fresh Gale Twigs broken from trees. Cars veer on road.
9 47-54 20.8-24.4 Strong Gale Light structure damage.