[Slang], a sounding characterized by extreme instability but containing a cap , such that explosive thunderstorm development can be expected if the cap can be weakened or the air below it heated sufficiently to overcome it. See
LOADED GUN (SOUNDING)
Meaning of LOADED GUN (SOUNDING) in English
A comprehensive English glossary of weather. Полный английский глоссарий погоды. 2012