| 1. | And in fact even behind Karen, there is another strong tropical wave,
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| 2. | During the late morning the tropical wave was upgraded to a depression.
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| 3. | A tropical wave moved off the coast of Africa on August 14.
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| 4. | And in fact even behind Karen, there is another strong tropical wave.
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| 5. | They're just tropical waves, the weakest member of the " tropical " family.
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| 6. | Once the tropical wave becomes organized, it becomes a tropical depression.
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| 7. | A vigorous tropical wave exited the west coast of Africa on September 3.
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| 8. | In late July, a tropical wave emerged off the west coast of Africa.
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| 9. | The tropical wave was moving westward at 32 kph ( 20 mph ).
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| 10. | Decreased wind shear in August allowed tropical waves to develop into tropical cyclones.
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