540. What level of development of a tropical cyclone has a hundred mile radius of circulation, gale force winds, less than 990 millibars of pressure and vertically formed cumulonimbus clouds?

The described system, characterized by gale-force winds, a 100-mile circulation, a pressure below 990 millibars, and cumulonimbus clouds, meets the criteria for a tropical storm. This classification distinguishes it from a weaker tropical depression or disturbance, and from a more intense typhoon.