Sztem egész nyugodtan elhihetõ, hiszen valóban ez a bevett terminus a hõzivatarra, de hogy senki se õrlõdjön kétségek között, itt egy hivatalos megerõsítés is nevet

forrás: NOAA National Weather Service - Glossary
link: Link

szöveg:
"air mass thunderstorm:
Generally, a thunderstorm not associated with a front or other type of synoptic-scale forcing mechanism. Air mass thunderstorms typically are associated with warm, humid air in the summer months; they develop during the afternoon in response to insolation, and dissipate rather quickly after sunset. They generally are less likely to be severe than other types of thunderstorms, but they still are capable of producing downbursts, brief heavy rain, and (in extreme cases) hail over 3/4 inch in diameter."