|
Wind Speed |
Wind Effect |
|
0-1
MPH |
Smoke
rises vertically. |
|
2-3
MPH |
Direction
of wind shown by smoke drift, but not by wind vanes. |
|
4-7
MPH |
Wind felt
on face; leaves rustle; ordinary wind vane moved by
wind. |
|
8-12
MPH |
Leaves and
twigs in constant motion; wind extends a light flag. |
|
13-18
MPH |
Raises
dust, loose paper; small branches are moved. |
|
19-24
MPH |
Small
trees in leaf begin to sway; crested wavelets form on
inland waters. |
|
25-31
MPH |
Large
branches in motion; whistling heard in power lines;
umbrella use is difficult |
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