Approaching thunderstorm with lead gust front.
Rain-cooled air from the storm moves out ahead of the storm.
It ploughs under the warm moist air forming a flat"shelf cloud."
Image ID: nssl0041, NOAA's National Severe Storms Laboratory (NSSL) Collection
Photo Date: 1982
Credit: NOAA Photo Library, NOAA Central Library; OAR/ERL/National Severe Storms Laboratory (NSSL)
Category: Sky Scenes/Clouds/
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
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May 12, 2014