89th American Meteorological Society Annual Meeting

Sunday, 11 January 2009
The 18 October 2007, Nappanee, IN Tornado Viewed by a WSR-88D Radar and a Dual-Polarized Radar
Phoenix Convention Center
Stephanie L. Dunten, Valparaiso University, Valparaiso, IN
On 18 October 2007, an EF-3 tornado came through Nappanee, Indiana in the northwest part of the state. This tornadic storm was also positioned near the weather forecast office North Webster's (IWX) 88-D Radar, and the Valparaiso University 5-cm simultaneous dual-polarized radar. The environment on 18 October had all the ingredients to produce a tornado. It was associated with a severe weather outbreak that occurred under the left-jet exit region with warm air advection taking place, deepening low pressure, a subtropical jet acting as a boundary to severe storms, a low level jet helping to aid in lift, and an approaching short-wave trough.

This poster will show the environment of 18 October 2007, and how its synoptic setup was favorable for severe weather. It will also show the development of the quasi linear convective system of the Nappanee tornado separate from the several squall lines that occurred on this day. In addition, views of the tornadic storm from both the 88-D and the Valparaiso radar will be shown. Lastly, unique products of the dual-polarized radar will be shown.

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