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Weak Wind Shear
storms have an erect appearance

[Image: storms in weakly shear environment (49K)]
Photograph by: Moller

Thunderstorms which occur in weak vertical wind shear usually have an erect appearance. These storms don't last as long as strong storms in a sheared environment since the rainy downdraft quickly undercuts and chokes off the updraft. If any severe weather occurs with these weak-shear storms, it will be brief, occurring just prior to dissipation. Weak-shear severe storms are often called "pulse storms." (Looking southeast from 20 miles.)

Terms for using data resources. CD-ROM available.
Credits and Acknowledgments for WW2010.
Department of Atmospheric Sciences (DAS) at
the University of Illinois at Urbana-Champaign.