Initially, the mass of thunderstorms with only a slight wind circulation is known as a(n) ____________________, or tropical wave. It becomes a(n) ____________________ when the winds increase to between 20 and 34 knots and several closed isobars appear about its center on a surface weather map. When the isobars are packed together and the winds are between 35 and 64 knots, it further develops into
a(n) ____________________. The latter is classified as a(n) ____________________ only when its winds exceed 64 knots (74 mi/hr).
Fill in the blank with correct word.
ANSWER: ?tropical disturbance; tropical depression; tropical storm; hurricane
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