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WYANDOTTE COUNTY KS RADIO AMATEUR CIVIL EMERGENCY SERVICE

Storm Spotters Manual
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THIS PAGE UNDER CONSTRUCTION!!!!

Basic Spotters Guide. Click here to download.

Advanced Spotters Guide. Click here to download.

Hail Diameter Size
1/4" Pea Size
 
1/2"
 
3/4" Dime Size
 
7/8" Nickel Size
 
1" Quarter Size
 
1 1/4" Half Dollar Size
 
1 1/2" Walnut or Ping Pong Ball Size
 
1 3/4" Golf Ball Size
 
2" Hen Egg Size
 
2 1/2" Tennis Ball Size
 
2 3/4" Baseball Size 
 
3"  Teacup Size
 
4" Grapefruit Size
 
4 1/2" Softball Size

Wind Speed Estimate
0 mph smoke rises vertically; water mirror-calm; tree leaves do not move
 
1 - 3 mph smoke drift indicates wind direction; weather vane does not move
 
4 - 7 mph wind felt on face; weather vane begins to move; leaves rustle; small wavelets
 
8 - 12 mph wind extends light flags; leaves and twings in constant motion; large wavelets
 
13 - 18 mph dust and loose paper raised; small branches move; small waves; many whitecaps
 
19 - 24 mph small trees sway; moderate waves
 
25 - 31 mph large branches in motion; whistling heard in telephone wires; larger waves forming
 
32 - 38 mph whole trees in motion; walking affected
 
39 - 46 mph twigs break off trees; walking difficult; moderately high waves
 
47 - 54 mph slight structural damage occurs; high waves; branches break 
 
55 - 63 mph trees uprooted; considerable structural damage; very high waves with overhanging crest
 
64 - 74 mph widespread damage; extremely high waves; damage to chimneys; shallow rooted trees blown over; limbs around 6" in diameter break off
 
75 - 112 mph severe and extensive damage; peels surfaces off roofs; windows broken; light mobile homes pushed or overturned; moving cars pushed off road
 
113 - 157 mph roofs torn off houses; cars lifted off ground

Fujita Tornado Intensity Scale
F0 Weak Tornado
0 - 72mph winds
0 - 17yds path width
Light damage
 
F1 Weak Tornado
73 - 112mph winds
18 - 55yds path width
Moderate damage
 
F2 Strong Tornado
113 - 157mph winds
56 - 175yds path width
Considerable damage
 
F3 Strong Tornado
158 - 206mph winds
176 - 556yds path width
Severe damage
 
F4 Violent Tornado
207 - 260mph winds
3/4 mile - 1 mile path width
Devastating damage
 
F5 Violent Tornado
261 - 308mph winds
1 mile - 4 mile path width
Incredible damage