Synoptic composites of the extratropical transition lifecycle of North Atlantic TCs as defined within cyclone phase space

The evolution of extratropically transitioning (ET) tropical cyclones (TC) are examined by using cyclone phase space. There were 34-member ensemble mean trajectory through cyclone phase space was defined for extratropoical transition in the North Atlantic. It was found that the variability from this mean trajectory is small in the tropical phase, and then increases dramatically once ET has completed. It was also observed that the TC intensity, trough intensity and tilt, separation distance and jet streak orientation all modulate the-tropical intensity change.