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08-18a
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Title: STAGES IN TORNADO DEVELOPMENT
Caption: (a) This wall cloud near Miami, Texas, is the lighter gray cloud to the left of the lightning bolt. Wall clouds hang downward from a severe thunderstorm and are often where tornadoes form. (NOAA Photo Library, NOAA Central Library; OAR/ERL/National Severe Storms Laboratory [NSSL])
Keywords: atmosphere, air pressures, atmospheric pressures, lows, tornadoes, cumulonimbus clouds, winds, funnel clouds