September 11, 2012: Jet stream buckles over Chicago, giving rise to a pocket of unusually cold, unstable air aloft.


	September 11, 2012: Jet stream buckles over Chicago, giving rise to a pocket of unusually cold, unstable air aloft. ../fullsize/bucklingjetstreamwgn09.19.12.jpg ../mediafiles/l83.jpg

September 11, 2012: Jet stream buckles over Chicago, giving rise to a pocket of unusually cold, unstable air aloft.

From Thomas Valle, Suzi Voss and John Wills of WGN-TV

See:

http://chicagoweathercenter.com/blog/buckling-jet-stream-to-deliver-area-its-coolest-fall-temps-yet

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