Original: Within the North Atlantic ocean, tropical or subtropical cyclones are named by the National Hurricane Center (NHC\/RSMC Miami) when they are judged to have intensified into a tropical storm with winds of at least 65 km\/h, (40 mph).
Simplified: Within the North Atlantic ocean, tropical or subtropical cyclones are named by the National Hurricane Center (NHC) when they are judged to have intensified into a tropical storm with winds of at least 65 km\/h, (40 mph).