I found this on a weather web site for estimating hail sizes:
0.25 inch: Pea.
0.50 inches: Marble.
0.75 inches: Penny.
1.0 inch: Quarter.
1.25 inches: Half-dollar.
1.50 inches: Walnut.
1.75 inches: Golf ball.
2.50 inches: Tennis ball.
2.75 inches: Baseball.
4.0 inches: Grapefruit.
Source: The National Weather Service Wilmington Spotter Guide, 2006
Use a conversion table to calculate centimeters from inches such as this
site http://www.manuelsweb.com/in_cm.htm
Linda J. Smith, BSE, FACCE, IBCLC
Bright Future Lactation Resource Centre Ltd
6540 Cedarview Ct, Dayton OH 45459
937-438-9458 / fax 937-438-3229
www.BFLRC.com
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