Home | SKYWARN | Cobb Weather | Meeting Info | ARES Leadership | General Information | Links

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

Weather 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 branches, walking difficult

47-54

Strong Gale

Slight structural damage occurs, branches break

55-63 (Severe)

Whole Gale

Trees uprooted, considerable structural damage

64-74

Storm

Widespread damage

75+

Hurricane

Severe and extensive damage

Hail Diameter Size

Description

.25"

Pea Size

.50"

Small Marble Size

.75" (Severe Criteria)

Penny or Large Marble Size

.875"

Nickel Size

1"

Quarter Size

1.25"

Half Dollar Size

1.5"

Walnut or Ping Pong Ball Size

1.75"

Golf Ball Size

2"

Hen Egg Size

2.5"

Tennis Ball Size

2.75"

Baseball Size

3"

Teacup Size

4"

Grapefruit Size

4.5"

Softball Size