Storm chasing to my understanding is defined as the art of being able to predict specific severe weather events and intercept those events in a specified location or near enough to it. When there is the possibility of a storm producing event, using my knowledge of past events I begin to follow what information I have available to see of the meteological models are "telling the truth". The models can change and nothing may eventuate (perhaps the modes may have over-estimated moisture and not much happens).