Yesterday morning at this time a bow-echo was in western Iowa, having moved across the Omaha area shortly after daybreak. That bow-echo produced severe winds and damage all the way east across the Chicago area late in the day. This morning another short line of severe thunderstorms is occurring; this time moving across northern Kansas. The 1407 UTC radar images from the NWS radar at topeka, Kansas, are shown above (0.5 degree reflectivity top and 0.5 degree velocity bottom). The line of storms exhibits a very strong shear zone and probably has a deep, nearly vertical, layer of intense convergence. It's not clear how long this event will persist, but the Kansas City area lies in its threat zone, and perhaps even St. Louis late in the day. Yesterday's event produced general chaos in the Chicago area and resulted in long airport delays. So, another day on tap with interesting summer-time severe storms.
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