Thunderstorm Wind in Allen County, Indiana

A mobile home rolled due to a failure of 1 or more properly secured straps from strong winds. A 74 year old woman was critically injured and later died at a nearby hospital. The woman was holding a 4 year old boy that only suffered minor injuries. The home rolled into an adjacent double wide mobile home. The initial mobile home was destroyed but all debris remained near the site. The adjacent mobile home suffered damage to the side and roof due to the home striking it. Other damage in the area was limited to some skirting of the mobile homes.

Convectively enhanced vorticity max lead to initiation of storms overnight Sunday across southern South Dakota. These initial storms grew upscale given concurrent downstream destabilization through northeast Nebraska and northwest Iowa. Widespread 80-100 mph winds developed through central/eastern Iowa as this derecho matured. Northern bookend and advection wing forcing led to some supercell structures across northern Illinois/southwest Wisconsin. Northern bookend turned northeast as it moved across Lake Michigan and tracked into western Michigan. As this occurred, attendant post convective wake low weakened as it crossed the lake. Thus the local area did not experience the 80 to 100 mph winds that N IL/E IA experienced. However the resultant slowing and breakup of the line as it moved across northwest Indiana/SW Michigan, yielded a LEWP and subsequent multiple small scale circulations developing along the line. These meso-vortices were associated with pockets of enhanced wind damage and brief tornado occurrences.