2006 Central Pacific cyclone
If Storm 91C is really a tropical or subtropical cyclone, it has several records. Since right now it is not officially either, its holding these records is also unofficial. Because the storm formed at 36°N, this system is the northernmost formation in the eastern north Pacific basin. The previous record-holder was Tropical Storm Wene, which formed at 32°N before crossing the dateline.  In addition, this system's track data shows that it crossed from the central to the east Pacific because it formed at longitude 149°W and dissipated at 135°W.  Only two other known tropical cyclones had done that before.