An intense cyclonic vortex over Florida at 36,000 feet is evidenced by Project Jet Stream's B-47 flight observations. Aircraft winds, temperatures, and cloud observations are presented with an analysis of synoptic charts. A weak jet stream on the west side of the vortex and strong horizontal shear are obvious. The scarcity of upper-air observations could cause an oversight of similar situations which are not reflected at the surface level.

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