With the heat and humidity of summer fully here, there is typically plenty of instability in the atmosphere to help support afternoon thunderstorms. Instability is not a lifting mechanism in the atmosphere, so it takes things like fronts and troughs to help get storms going to then feed off the instability. A few storms got going Tuesday afternoon over eastern Iowa along a boundary and the featured image taken from the KCRG-TV webcam at Tipton shows a well defined wall cloud that produced a number of funnel clouds. A YouTube lapse is available that nicely shows the rotation with this storm. The low level shear (change of wind speed / direction with increasing height above ground) was not sufficient to support more than a brief tornado near the World's Largest Truck Stop with these storms.

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Tags:   webcam