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Iowa State University

1997

Geological and Atmospheric Sciences Publications

Geology

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An Intense Small-Scale Wintertime Vortex In The Midwest United States, William A. Gallus Jr., James F. Bresch Nov 1997

An Intense Small-Scale Wintertime Vortex In The Midwest United States, William A. Gallus Jr., James F. Bresch

Geological and Atmospheric Sciences Publications

An intense small-scale low pressure system that moved across portions of the midwest United States is examined. The system produced a continuous band of significant snowfall, typically only 50 km wide but extending over 1500 km in length. The system traveled across the Iowa Department of Transportation surface mesonetwork, allowing high-resolution surface analyses that show a closed circulation and intense pressure gradients around the mesolow, comparable to those occurring in warm season MCS events. Radar and satellite images also revealed the small-scale low-level circulation. which apparently was confined below about 800 mb. Although the strong vorticity advection aloft and baroclinicity ...