Tropical Cyclone - A warm-core area of low pressure originating over tropical or subtropical waters, containing organized deep thunderstorms, a closed surface wind circulation, and maintained by warm ocean waters beneath it.

Tropical Depression - A tropical cyclone in which the maximum sustained surface wind speed is 38 mph (33 knots) or less. 

Tropical Storm - A tropical cyclone in which the maximum sustained surface wind speed ranges from 39 mph (34 knots) to 73 mph (63 knots). 

Hurricane - A tropical cyclone in which the maximum sustained surface wind is 74 mph (64 knots) or more. 

Tropical Storm Watch – Issued for specific coastal areas when a tropical storm may affect the area within 36 hours. 

Tropical Storm Warning – Issued when tropical storm conditions are expected for a specified coastal area within 24 hours or less. 

Hurricane Watch – Issued for specific coastal areas when a hurricane may affect the area within 36 hours. 

Hurricane Warning – Issued when hurricane conditions are expected for a specified coastal area in 24 hours or less.