2 describes a rare and interesting subtropical cyclone that developed over the southeast Pacific, a region usually not conducive to such development.
2: A SOUTHEAST PACIFIC BASIN SUBTROPICAL CYCLONE OFF THE CHILEAN COAST--S.
In late April, Earth Observing (EOSDIS) satellite imagery showed a cyclonic circulation in the southeastern Pacific basin that appeared to meet the definition of a subtropical cyclone.
4), and the conditions described also support the identification of the system as either a tropical or subtropical cyclone.
Although it may briefly have exhibited TC characteristics, and while the imagery is consistent with a subtropical cyclone, the system should be further examined for inclusion as a Southern Hemisphere tropical cyclone in the formal global archives.
Environmental conditions are generally conducive for a tropical or subtropical cyclone
to form later today or Saturday while this system moves west-northwestward to northwestward toward the Southeastern United States coast," the center's 7:45 a.
da Rocha, 2013: Synoptic and dynamical analysis of subtropical cyclone Anita (2010) and its potential for tropical transition over the South Atlantic Ocean.
2010: Simulations of subtropical cyclones in a baroclinic channel model.
Braun, 2012: A climatology of subtropical cyclones in the South Atlantic.