…DEXTER BECOMES A STORM-FORCE EXTRATROPICAL LOW OVER THE NORTH ATLANTIC… …THIS IS THE FINAL NHC ADVISORY… As of 11:00 AM AST Thu Aug 07 the center of Dexter was located near 41.4, -50.4 with movement ENE at 17 mph. The minimum central pressure was 998 mb with maximum sustained winds of about 60 mph.