HAIL SIZE ESTIMATE COMPARISON CHART

Pea...................0.25 inches   Golfball...............1.75 inches
Penny.................0.75 inches   Tennis ball............2.50 inches
Quarter...............1.00 inches   Baseball...............2.75 inches
Half Dollar...........1.25 inches   Grapefruit.............4.00 inches

(borrowed from the NOAA/NWS publication, `ADVANCED SPOTTER'S FIELD GUIDE')