| Stages
of Hurricane Development |
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| • | Tropical
Disturbance – thunderstorms with only |
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| slight
wind circulation |
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| • | Tropical
Depression – winds increase to between |
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| 20
and 34 knots. Several closed isobars appear. |
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| • | Tropical
Storm – winds are between 35 and 64 |
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| knots. |
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| • | Hurricane
– winds exceed 64 knots (74 mph). |
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