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National Weather Service Portland-Gray Maine
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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 Ball2.50"
Color indicates beginning of severe winds

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National Weather Service
Gray Weather Forecast Office
P.O. Box 1208
Gray, ME 04039
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Page last modified: November 20th, 2007
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