Hurricane Irene is now heading for the east coast of the USA after turning into a category 3 storm. Already Irene has caused widespread damage to Puerto Rico and the Dominican Republic. Power supplies were knocked out and up to 100,000 people lost access to their water supply.
Florida is now on alert as the first hurricane of the Atlantic season heads north. In addition, if the hurricane does make the Florida coastline, there is likely to be a significant storm surge which would create additional problems. However, some predictions suggest that the hurricane may actually head off eastwards and miss the US coast completely
More detail and information, including animated maps and video can be found via some excellent CNN reports here