Subtropical Cyclone
A low pressure system that develops over subtropical waters that initially has a non-tropical circulation but in which some elements of tropical cyclone cloud structure are present.
Subtropical Cyclone: A non-frontal low pressure system that has characteristics of both tropical and extratropical cyclones.
6) Subtropical Cyclone Public Advisory (SPA): These advisories are issued when a subtropical storm is affecting or is forecasted to affect the U.S., our territories, or our installations.
A subtropical cyclone is a weather system that has some characteristics of a tropical cyclone and some characteristics of an extratropical cyclone. They can form in a wide band of latitudes, from the equator to 50°.
Advisories are also issued to describe: (a) tropical cyclones prior to issuance of watches and warnings and (b) subtropical cyclones.Tropical Analysis and Forecast BranchOne of three branches of the Tropical Prediction Center (TPC).
Subtropical cyclones sometimes become true tropical cyclones, and likewise, tropical cyclones occasionally become subtropical storms.
Center/Vortex Fix: The location of the center of a tropical or subtropical cyclone obtained by reconnaissance aircraft penetration, satellite, radar, or synoptic data.
Existing tropical and subtropical cyclones are mentioned, as are depressions not threatening land. Given for each system are its location, size, intensity, and movement.
 See also: Tropical cyclones, Storm, Warning, Cyclone, Center
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