Abstract
The evolution of criteria for nontornadic severe thunderstorms from undefined categories and general terms to the present day definition for this class of thunderstorm is presented. Major historical events in the development of the Severe Local Storms Unit (SELS) which directly or indirectly influenced changes in the criteria are included. Abstract The evolution of criteria for nontornadic severe thunderstorms from undefined categories and general terms to the present day definition for this class of thunderstorm is presented. Major historical events in the development of the Severe Local Storms Unit (SELS) which directly or indirectly influenced changes in the criteria are included.

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