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Hail and Wind Descriptors

Hail Diameter Description Hail Diameter Description
1/4" Pea Size 1 3/4" Golf Ball Size
1/2"   2" Hen Egg or Lime Size
3/4" Penny Size 2 1/2" Tennis Ball Size
7/8" Nickel Size 2 3/4" Baseball Size
(Severe Criteria)
Quarter Size 3" Teacup or Apple Size
1 1/4" Half Dollar Size 4" Grapefruit Size
1 1/2" Walnut or Ping Pong Ball Size 4 1/2" Softball Size


Wind Speed Estimate Description
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
39-54 mph Twigs break off trees; wind generally impedes progress
55-72 mph
(58 mph=Severe Criteria)
Damage to chimneys and TV antennas; pushes over shallow rooted trees
73-112 mph Peels surfaces off roofs; windows broken; light mobile homes pushed or overturned; moving cars pushed off road
113-157 mph Roofs torn off houses; cars lifted off ground

Quick Links for Spotters

National Weather Service logo For further information concerning our spotter program at
National Weather Service Sioux Falls, please contact:
Peter Rogers, Warning Coordination Meteorologist.