Pulse Storms
Pulse storms develop in weakly-sheared unstable environments and have lifetimes from inception, to maturity, to decay of about half an hour.
Conceptual model of the evolution of a typical pulse thunderstorm
An isolated thunderstorm developed south of Green Bay at 4:03 PM July 5, 1994
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The storm doesn't look that impressive on radar. The cross-section clearly shows that the updraft is vertical
A four panel display showing CAPPI images taken and different scan angles shows that it is vertically stacked as well
That unimpressive pulse storm did spin up a landspout that was on the ground for 12 minutes, covered 5.5 km, did F3 damage. The tornado caused $2.1 million in damage and 2 injuries.