|Hail Size Reference Chart|
|Hail Diameter (Inches)||Reference Object|
|1.50||Ping Pong Ball|
|Beaufort Wind Speed Estimate Scale|
|MPH||Knots||On Land||On Water Surfaces|
|0||Calm||0||0-1||Calm. Smoke rises vertically.||Waters are mirror smooth.|
|1||Light Air||1-3||1-3||Smokes drift indicates wind direction. Still wind vanes.||Waters have a ripple.|
|2||Light Breeze||4-7||4-6||Wind is felt on face, leaves rustle, wind vanes begin to move.||Small wavelets, crests glassy, no breaking.|
|3||Gentle Breeze||8-12||7-10||Leaves and small twigs constantly move, light flags are extended.||Large wavelets, crests begin to break, scattered whitecaps.|
|4||Moderate Breeze||13-18||11-16||Dust, leaves and loose paper lifted, small tree branches move.||Small waves (1-4 ft) becoming longer with numerous whitecaps.|
|5||Fresh Breeze||19-24||17-21||Small trees in leaf begin to sway.||Moderate waves (4-8 ft) taking longer form, many whitecaps, some spray.|
|6||Strong Breeze||25-31||22-27||Larger tree branches moving, whistling in wires.||Larger waves (8-13 ft), whitecaps common, more spray.|
|7||Near Gale||32-38||28-33||Whole trees moving, resistance felft walking against wind.||Mounting sea (seas heaps) (waves 13-20 ft), foam streaks off of breakers.|
|8||Gale||39-46||34-40||Twigs break off of trees, resistance felt walking in wind.||Moderately high waves (13-20 ft) of greater length, edges of crests begin to break into spindrift, foam blown in streaks.|
|9||Strong Gale||47-54||41-47||Twigs break off of trees, wind impedes walking.||High waves (20 ft), sea begins to roll, dense streaks of foam, visibility affected by spray.|
|10||Storm||55-63||48-55||Damage to TV antennae, large branches break off trees.||Very high waves (20-30 ft) with overhanging crests, sea white with dense blown foam, heavy sea roll, visibility impaired.|
|11||Violent Storm||64-73||56-63||Widespread damage. Signficant tree damage.
||Exceptionally high waves (30-45 ft), foam patches cover the sea, poor visibility.|
73-112 mph: Roof surfaces peeled off, windows broken, trailer homes overturned.
113+ mph: Roofs blown from houses, weak buildings and trailer homes destroyed, large trees uprooted, train cars blown off tracks.
|Storm waves (> 45 ft), air filled with foam and spray, sea completely white, visibility bad.|