Severe thunderstorm evolution and mesocyclone structure as related to tornadogenesis. Evolutionary characteristics and photogrammetric determination of windspeeds within the Tulia outbreak tornadoes 28 May 1980. Preprints, 12th Conf. Severe Local Storms , San Antonio, Amer. Dashes indicate weak features.
Numbers refer to the order in which vortices appear in the storm.
Gust fronts and tornado tracks are indicated by thick lines and very thick numbered lines, respectively. Sources of low-level outflow from the rear of a storm. Precipitation regions are shaded. Numbers refer to the order in which vortices appear in the storm.