National Weather Service Weather Forecast Office

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SKYWARN Organization in the Kansas City Area	EMWIN Weather Information via VHF
Codes for the SAME Weather Radio's	StormSpotters Glossary
StormSpotters Training Guide	How to Become a Storm Spotter
Skywarn Radio Frequencies to Monitor	Safety Rules During Severe Weather

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HAIL DIAMETER SIZE AND WIND DESCRIPTORS

HAIL DIAMETER SIZE	DESCRIPTION
1/4"	Pea Size
1/2"
3/4" (Severe Criteria)	Dime Size
7/8"	Nickel Size
1"	Quarter Size
1 1/4"	Half Dollar Size
1 1/2"	Walnut or Ping Pong Ball Size
1 3/4"	Golf Ball Size
2"	Hen 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 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	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

 

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Send E-mail to SKYWARN Coordinator at NWS Kansas City/Pleasant Hill