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We knew about the potential for the development of a hurricane a week before it happened became a hurricane. The National Hurricane Center (NHC) first started tracking a tropical wave off the coast of Africa on August 15, 2011. Although it was not known how the system would develop at the time. Over the next few days the NHC tracked system gradually became stronger and more organized until it became Tropical Storm Irene on August 20. The storm continued to strengthen, becoming a hurricane on August 22 as it struck Puerto Rico.

The NHC had bee tracking it the whole time and releasing regular updates.

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