Hurricane Bertha gains strength

MIAMI, Florida (CNN) - Hurricane Bertha continued to strengthen Monday, hours after becoming the first hurricane of the 2008 Atlantic season, according to the National Hurricane Center.

As of 11 a.m. ET, Bertha was 775 miles (1,247 km) east of the northern Leeward Islands and was moving toward the west-northwest near 15 mph. Its maximum sustained winds were clocked at 90 mph, up from 75 mph earlier in the day. "Some strengthening is forecast during the next 24 hours and Bertha could become a Category 2 hurricane later today or tonight," the center said.

There is a very small chance that Bertha will make landfall in the United States. Bermuda could be affected by the hurricane this weekend.