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: nssl0045, NOAA's National Severe Storms Laboratory (NSSL) Collection
Location: New Mexico, Brookhaven
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