The number of named storms expected in the Atlantic basis this season is between 14 to 19 - up from the original 11 to 17 forecast released just before the season started.
Forecasters now predict two to five major hurricanes this season, characterized as Category 3 or above.
An active season is in store as the number of named storms will likely to be higher than originally thought, the National Oceanic and Atmospheric Administration announced on Wednesday.
"Wind patterns that are conducive to storm development are now in place across the tropical Atlantic", Bell said.
NOAA said the busier forecast reflects lowered chances of El Nino forming. 30 and produces 12 named storms, of which six become hurricanes, including three major hurricanes, according to the NOAA.
The Atlantic Ocean now faces a higher likelihood of an "extremely active" hurricane season with more storms than previously predicted, U.S. forecasters warned Wednesday, updating the previous outlook issued in May. The phenomenon increases wind shear in the smaller ocean, which can tear apart tropical systems.
The U.S. National Hurricane Center said Franklin began gaining strength after getting over open water again, with its maximum sustained winds quickly rising to 70 miles per hour (110 kph) Wednesday.
Of the 16 named storms, five have already occurred namely tropical storms Arlene, Bret, Cindy, Don and Emily, but are nonetheless included in the seasonal forecast. He also noted that the conditions are similar to other summers that went on to have active hurricane seasons.
Franklin made its first landfall on Mexico's Yucatan peninsula on Monday, dumping heavy rain on some of the country's premier tourist beaches.
Franklin is expected to make landfall early Thursday morning, and it could make landfall as this year's first hurricane.
Hurricane-force winds extend outward up to 35 miles (55 km) from the center and tropical-storm-force winds extend outward up to 140 miles (220 km).
The Atlantic hurricane season typically reaches a peak in September.