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Photographer's description: State Road 38 and
Jacksonburg Road I was facing North.
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Photographer |
Jim Scott - NWS Spotter |
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Date taken |
August 19, 2009 |
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Location |
Near Hagerstown, IN (Wayne
County)
map |
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Event |
Wall Cloud |
Additional notes
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This well-defined
wall cloud was from a
supercell thunderstorm that produced a weak tornado near Greenville, Ohio.
A seen here, a wall cloud is a localized, persistent, often
abrupt lowering from a rain-free base. Wall clouds can range from a
fraction of a mile up to nearly five miles in diameter, and normally are
found on the south or southwest (inflow) side of a supercell
thunderstorm. When seen up close, many wall clouds
exhibit rapid upward motion and counterclockwise rotation.
Rotating wall clouds usually
develop before strong or violent tornadoes, by anywhere from a few
minutes up to nearly an hour. Wall clouds should be monitored visually
for signs of persistent, sustained rotation and/or rapid vertical
motion.
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www.nws.noaa.gov 
