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1. Any Funnel Cloud , Tornado or Wall Cloud.
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Hail:
A. Pea size (if it has not already been reported
within 5 miles of your location)
B. Hail
larger than pea size (anytime).
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3. Rain: - only if it causes major street
flooding i.e. 1" per hour.
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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.
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| 5. Lightning: - Frequent lightning in your
area. 20 strokes/min or greater within 10 miles.
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| 6. Property Damage: - Report any significant
property damage caused by the storm. |
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!
More Severe Storm Information
