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SKYWARN Amateur Radio Information
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Severe Hail Size Estimates |
Beaufort Wind Scale (>25 mph) |
| Indicator |
Size |
Estimated Speed |
Characteristics |
| Penny/Dime |
0.75" |
25 - 31 mph |
large branches in motion; Whistling powerlines. |
| Nickel |
0.88" |
32 - 38 mph |
whole trees in motion. |
| Quarter |
1.00" |
39 - 54 mph |
twigs and small limbs break off trees; Wind impedes walking. |
| Half Dollar |
1.50" |
55 - 72 mph |
damage to chimneys and antennas; Pushes over shallow rooted trees. |
| Golf Ball |
1.75" |
73 - 112 mph |
peels surface off roofs; Windows broken; Mobile homes overturned. |
| Hen Egg |
2.00" |
113+ mph |
roofs torn off homes; mobile homes and weak buildings destroyed; large trees uprooted. |
| Tennis Ball | 2.50" |
| Baseball | 2.75" |
| Grapefruit | 4.00" |
| Softball | 4.50" |
| Color indicates beginning of severe winds |
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Training Schedule
Additional Information
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weather.gov 
