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SUBTROPICAL: The region between the tropical and temperate regions, an area between 35 and 40 degrees North and South latitude. This is generally an area of semi-permanent high pressure that exists and is where the Azores and North Pacific Highs may be found.
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 cyclones can evolve into tropical cyclones.
SUBTROPICAL DEPRESSION: A subtropical cyclone in which the maximum sustained surface wind speed (using the U.S. 1-minute average) is 38 mph (33 knots) or less.
SUBTROPICAL HIGH: A semi-permanent high-pressure region near 30 degrees latitude.
SUBTROPICAL STORM: A subtropical cyclone in which the maximum sustained surface wind speed (using the U.S. 1-minute average) is 39 mph (34 knots) or more.
SWATH: The width of the path of the hurricane. Usually this path area is about 125 miles wide with 75 miles to the right of the eye and 50 miles to the left of the eye.
SYNOPTIC SCALE: The size of migratory high and low pressure systems in the lower troposphere that cover a horizontal area of several hundred miles or more such as hurricanes. Contrasts with macroscale, mesoscale, and storms.
SYNOPTIC SURVEILLANCE TRACK: Weather reconnaissance mission flown to provide vital meteorological information in data sparse ocean areas as a supplement to existing surface, radar, and satellite data. Synoptic flights better define the upper atmosphere and aid in the prediction of tropical cyclone development and movement.
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