 A low pressure system developed after detaching from a cold front while between Florida and Bermuda . The low pressure area slowly formed a circulation and began to deepen on October 14 as it drifted north @-@ northeastward . By October 15 , the system developed into a subtropical depression while centered about midway between Florida and Bermuda . Later that day , satellite classifications using the Hebert @-@ Poteat technique indicated that the subtropical depression had strengthened into a subtropical storm , and it was upgraded at 0000 UTC on October 16 . Due to SST 's in excess of 82 ° F ( 28 ° C ) , the subtropical storm developed persistent convection near the low @-@ level center and it slowly acquired tropical characteristics . By 0000 UTC on October 17 , the subtropical storm was re @-@ classified as Tropical Storm Michael . Three hours later , the National Hurricane Center began advisories on Michael , though initially it was erroneously classified as Tropical Depression Seventeen . 
