Ophelia became the fourth hurricane of the 2011 Atlantic hurricane season Thursday afternoon.

Hurricane Ophelia was about 770 miles south-southeast of Bermuda at 5 p.m. Maximum sustained winds were 75 mph with higher gusts. Ophelia is a Category 1 on the Saffir-Simpson Hurricane Scale. Additional strengthening is possible, according to the National Hurricane Center.

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© NWS National Hurricane Center
Movement was to the north-northwest at about 9 mph. A tropical storm watch is in effect for Bermuda. Hurricane force winds extend outward up to 25 miles from the center. Tropical storm force winds extend outward up to 175 miles.

The NHC says tropical storm force winds are possible in Bermuda starting late Saturday.

Thus far, August continues to be the most active month for the 2011 hurricane season with September coming in at second place. However, Pinellas County Emergency Management reminds residents that October can be worrisome for those living along Florida's west coast. In fact, the only hurricane ever to make landfall in Pinellas happened 90 years ago on Oct. 25, 1921.

"As the hurricane season passes middle age and begins its trek downhill, the spawning grounds of these tropical nemeses moves closer to Florida. Storms developing in the Western Caribbean or Gulf of Mexico have a better chance of visiting the sunshine state than those that are born in the far Eastern Atlantic," said meteorologists from the National Weather Service office in Ruskin in a "half-time" report.

Hurricane season has passed its peak, which means fewer storms are expected in the weeks ahead.

" But while having fewer storms to worry about may be comforting, it is important to remember that it only takes one to change your life forever," NWS says in its report.

The National Oceanic and Atmospheric Administration predicted 14 to 19 named storms could form this season with seven to 10 becoming hurricanes and three to five strengthening into major hurricanes, Category 3, 4 or 5.

Dr. William Gray, professor emeritus at the Colorado State University, and Dr. Phil Klotzbach, CSU research scientist, said residents living in coastal areas should prepare for 16 named storms, nine hurricanes and as many as five major hurricanes. The long-term seasonal average, 1944-2010, is 11 named storms, six hurricanes and two major hurricanes. To date in 2011, the number of named storms, 16, well exceeds the average; however, only four hurricanes have formed, which is below the average. Two is the average number of major hurricanes in a season.

Season summary

Hurricane season for the Atlantic basin begins June 1. On average one tropical storm forms every other year during that first month. This year, 2011, was one of those years. Tropical Storm Arlene formed June 29 and made landfall along the coast of Mexico June 30.

Three named storms formed in July - well above the long-term average of one.

Tropical Storm Bret formed July 17 off the eastern coast of Florida. The storm never came close to land, tracking north and east before disintegrating over the Atlantic Ocean July 22.

Tropical Storm Cindy from July 20 well offshore in the eastern Atlantic and was never a threat to land. It became a post-tropical storm on July 23.

Tropical Storm Don formed July 27 about 190 miles north of Cozumel Mexico. It fell apart as it came ashore the coast of Texas near Baffin Bay July 29.

August was the busiest month with a tropical depression and seven named storms, including Irene, which became the season's first hurricane and first major hurricane.

Emily formed Aug. 1 about 50 miles west-southwest of Dominica. The storm degenerated into a tropical low Aug. 4.

Tropical Storm Franklin formed about 460 miles north-northeast of Bermuda early in the morning of Aug. 13. By end of day, the NHC announced it had lost its tropical characteristics. It was never a threat to land, remaining over the northern Atlantic Ocean.

Tropical Storm Gert formed Aug. 14 about 275 miles south-southeast of Bermuda. Two days later, Gert had degenerated into a post-tropical low.

Tropical storm Harvey formed Friday, Aug. 19, about 285 miles east-southeast of Belize City and made landfall near Dangriga Town Belize on Saturday afternoon. Maximum sustained winds were 40 mph.

Hurricane Irene formed Aug. 20 east of the Leeward Islands about 190 miles east of Dominica. Irene was the ninth named storm of the season and the first hurricane and major hurricane. It is the first to hit the United States since 2008.

Irene made landfall twice along the U.S. East Coast - first in North Carolina on Aug. 27 and again the next day in New Jersey. Irene is blamed for as many as 55 deaths and billions of dollars in damage.

Tropical Storm Jose formed Aug. 28 in the eastern Atlantic while Irene was making its way along the Atlantic Seaboard. Jose skirted to the west of Bermuda before heading off into the open waters.

Katia formed Aug. 29 about 535 miles west-southwest of the southernmost Cape Verde Islands. The NHC tracked its path until Sept. 10 when it went post-tropical about 295 miles east-southeast of Cape Race Newfoundland. Katia was the second hurricane and second major hurricane of the season. It followed a similar path to Irene, only remaining offshore, traveling through the Atlantic between the U.S. East Coast and Bermuda.

Tropical Storm Lee formed Sept. 2 south of Louisiana and made landfall over south-central Louisiana Sept. 4. Lee created problems for residents of Louisiana, Mississippi, Alabama and the Florida Panhandle over the Labor Day weekend before moving on to bring rain and winds to residents still cleaning up from Hurricane Irene. The red flags waved on Pinellas County beaches due to rip current dangers as Lee kicked up large waves in the Gulf of Mexico. Lee was the first tropical storm to made landfall in Louisiana since Hurricane Gustav in 2008.

Maria began as Tropical Depression 14 the afternoon of Sept. 6 and became a tropical storm on Sept. 7. It was located about 1,220 miles west of the Cape Verde Islands. Maria followed a similar path to Hurricane Katia, moving offshore the U.S. East Coast and Bermuda. It became a hurricane on Sept. 15 and was a post-tropical cyclone by Sept. 16.

Nate, the 14th named storm, formed Sept. 7 in the Bay Campeche. Nate made landfall Sept. 11 along the coast of Mexico just north of Barra de Nautla.

Two storms are active now: Ophelia, which formed Sept. 20 in the central tropical Atlantic and degenerated into a remnant low on Sept 25, is now the fourth hurricane of the season, and Philippe - the season's 16th named storm, which formed Sept. 24.

The last five names on the 2011 list are Rina, Sean, Tammy, Vince and Whitney

Hurricane season ends officially on Nov. 30.