| 11. | The government of the Cayman Islands issued a tropical storm warning.
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| 12. | The hurricane weakened to a tropical storm on Sept . 23.
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| 13. | Tropical storms with high winds plague the impoverished country every summer.
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| 14. | Tropical storms and typhoons hit the region frequently during the summer.
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| 15. | Tropical storm warnings extended northward along the Virginia coast to Chincoteague.
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| 16. | But forecasters issued a tropical storm warning for the East Coast.
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| 17. | Now Tropical Storm Harvey is churning in the Gulf of Mexico.
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| 18. | Tropical storms thrive on energy and moisture supplied by warmer water.
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| 19. | Tropical storms become hurricanes at 74 mph ( 120 kms ).
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| 20. | Tropical storms are classified hurricanes when sustained winds exceed 70 mph.
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