National Weather Service United States Department of Commerce
Severe Weather Reference Tables

When reporting hail, and to avoid any misunderstandings, please use the table below as a reference...

pea 1/4
plain M&M 1/2
penny 3/4
nickel 7/8
quarter 1
half-dollar 1 1/4
walnut/ping-pong ball 1 1/2
golf ball 1 3/4
lime 2
tennis ball 2 1/2
baseball 2 3/4
softball 4
grapefruit 4 1/2

...and for wind reporting, here is the Beaufort Scale to help estimate the wind speeds.


Wind Speed (mph) Designation Description
<1 calm smoke rises vertically, trees do not move
1-3 light air smoke drift indicates wind direction
4-7 light breeze weaTDer vane moves, leaves rustle
8-12 light breeze leaves and twigs in constant motion
13-18 moderate breeze dust and loose paper raised, small branches move
19-24 fresh breeze small trees sway
25-31 strong breeze large branches move, wind whistles wires
32-38 moderate gale whole trees move, walking affected
39-46 fresh gale twigs break off trees, walking difficult
47-54 strong gale slight structural damage occurs, branches break
55-63 whole gale trees uprooted, considerable structural damage
64-74 storm widespread damage
75+ hurricane severe and extensive damage