KALAMAZOO COUNTY SKYWARN
REPORTING GUIDELINES DURING SEVERE THUNDERSTORMS
NWS SPOTTER TX# 1-800-647-3836
What to report to net control. Remember TLC...Time...Location...Conditions
1. Any Funnel Cloud , Tornado or Wall Cloud.
A. Pea size (if it has not already been reported within 5 miles of your location)
B. Hail larger than pea size (anytime).
3. Rain: - only if it causes major street
flooding i.e. 1" per hour.
4. Wind :
A. Significant inflow winds toward a Supercell.
B. Winds associated with thunderstorms in excess of 50mph. If not previously reported.
C. Winds in excess of 55mph.
D. Gust front winds at your location (if not already reported by a nearby station).
E. Winds rotating (horizontally) at the base of a thunderstorm. Especially near a wall cloud.
Wind-speed estimation: (in m.p.h.)
25-30 Large branches in motion. Whistling heard in utility wires.
30-40 Large trees in motion. Small twigs break off.
40-50 Limbs to ½" diameter break off. Larger rotted limbs blown down. some roof shingles may be blown off. Garbage cans and lawn furniture may be blown away.
50-60 Limbs up to 2" diameter break off. Rotted trees may be blown over. Light damage to mobile homes, out-buildings, sheds etc. TV antennas may be damaged.
60-70 Limbs up to 6" diameter break off. Downed power lines. Shallow rooted trees and trees in wet soil blown over. Moderate to severe damage to pole buildings.
70-110 Some roofs peeled off. Windows broken by force of wind.
Mobile homes pushed or overturned. Some healthy well-rooted trees
snapped off, badly broken or uprooted. Moving automobiles pushed
off the road.
110+ Run for it!