Hurricane Bill has strengthened to a Category 4 storm out over the Atlantic. National Hurricane Center (NHC) forecasters say the storm is expected to strengthen some more during the next 24 hours and that interests in the Leeward Islands and Bermuda should monitor the progress of Bill. Current tracks put Bill passing between Bermuda and the U.S. mainland this weekend and then moving up towards Canada. Early this morning, the center of Bill was located about 460 miles east of the Leeward Islands in the Caribbean. To put it in context, a Category 4 storm on the Saffir-Simpson scale denotes a storm with sustained winds of 131-155 miles per hour. If a storm of this strength makes landfall extremely dangerous winds causing devastating damage are expected. A storm of this strength would cause extensive damage to properties and windborne debris could injure or kill. Most trees will be snapped or uprooted and fallen trees could cut off residential areas for days to weeks. Power will be unavailable for weeks. Hurricane Charley, which made landfall in southwest Florida in 2004, and Hurricane Hugo, which made landfall in South Carolina in 1989, are both examples of Category Four hurricanes at landfall. Charley and Hugo rank as the fifth and seventh most costly hurricanes in U.S. history, respectively. So there is much reason for insurers to hope that Hurricane Bill will stay far out at sea. Check out I.I.I. hurricane facts and stats.