A cold front

Convection developed into narrow banding features far from the center, and the overall structure gradually organized. It is estimated the system developed into Subtropical Depression Twelve late on September 20, about 825 miles (1330 km) southeast of Bermuda; it was classified subtropical because of the distance of the convection from the center. The cyclone tracked northward within the weak steering flow between an upper-level low to its south and a trough to its north. Strengthening gradually, the depression attained subtropical storm status early on September 21, and as such was named Kyle by the National Hurricane Center.[1]



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