Hail Diameter Size and Wind Descriptors 

 

Hail Diameter Size Description

1/4"

Pea Size

1/2"

Dime Size

3/4" 

Penny Size

7/8"

Nickel Size

1" (Severe Criteria)

Quarter Size

1 1/4"

Half Dollar Size

1 1/2"

Ping Pong Ball Size

1 3/4"

Golf Ball Size

2"

Egg Size

2 1/2"

Tennis Ball Size

2 3/4"

Baseball Size

3"

Teacup Size

4"

Grapefruit Size

4 1/2"

Softball Size

 

 

Wind Speed Estimation Description

less than 1 mph

Calm; smoke rises vertically

1 - 3 mph

Direction of wind shown by smoke drift,
but not by wind vanes

4 - 7 mph

Wind felt on face; leaves rustle;
ordinary vane moved by wind

8 - 12 mph

Leaves and small twigs in constant motion;
wind extends light flag

13 - 18 mph

Raises dust and 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 telephone wires

32 - 38 mph

Whole trees in motion;
inconvenience felt walking against the wind

39 - 46 mph

Breaks twigs off trees;
wind generally impedes progress

47 - 54 mph

Slight structural damage
occurs

Severe begins at 58 mph

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55 - 63 mph

Damage to chimneys and TV antennas;
pushes over shallow rooted trees

64 - 74 mph

Rarely experienced;
structural damage becomes possible

above 75 mph

Very rarely experienced; see
Fujita scale descriptions

Wind speed estimation taken from the Beaufort Scale.

 

 


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