Predictions on how Humberto could affect Florida and the U.S. are difficult due to the Fujiwhara effect. Humberto strengthened rapidly on Sept. 26 and is now a major Category 3 hurricane, according to the latest advisory from the National Hurricane Center.

Hurricane Humberto has intensified into a Category 4 storm with 145 mph winds in the Atlantic. While no US landfall is forecast, dangerous swells and rip currents are affecting Puerto Rico, Bermuda, and the U.

Humberto grew into a Category 4 hurricane on Friday evening, "rapidly strengthening" into a major hurricane, but there were no immediate watches or warnings issued for the U.S. by the National Hurricane Center.

The Atlantic hurricane season may still be running a bit behind schedule when it comes to the number of their namesake storms, but what the season has lacked so far in quantity it has made up for in quality,

Have you noticed how many hurricanes starting with the letter "I" have been terribly destructive lately? It turns out there's a simple explanation.

Many people think of warm ocean temperatures as the main force behind the evolution of hurricanes. And, yes, the hot seas contribute immensely to powering nascent tropical systems. But 80 percent of major hurricanes during the Atlantic season actually start off as a mere tropical wave.

Hurricane Humberto is expected to pass near Bermuda during Tuesday and Wednesday, bringing the risk of strong winds, heavy rainfall. The powerful hurricane will create massive seas over the western Atlantic.