Tropical storm Humberto continued to gather strength Tuesday, and may become the first Atlantic hurricane of the 2013 season, according to forecasts. If tropical storm Humberto does not become a hurricane by Wednesday, it will be the latest date for the first hurricane to arrive in a season since the mid-1960s.

Humberto is the eighth tropical storm of the season, which began June 1 and will continue until about November 30, NBC News reports.

Experts said the first hurricane of the season usually forms by August 10. Since satellites were used to forecast hurricanes in the mid-1960s, the latest date for the first hurricane to arrive was set in 2002 when Hurricane Gustav formed on September 11, according to NBC News.

If Humberto achieves hurricane status any time after 8 a.m. ET on Wednesday, it would replace Gustav as the latest date for the first hurricane to arrive, forecasters said.

Tropical Storm Humberto's maximum sustained winds have increased to near 65 mph, CBS News reports.

At 5 a.m. EST, the center of the storm was about 150 miles west of the southernmost Cape Verde Islands, reports CBS Miami.

The National Hurricane Center forecasts that Humberto will take a turn to the northwest; the tropical storm force winds extend outward up to 80 miles from the center of Humberto.

The National Hurricane Center in Miami issued advisories for Humberto, though the storm is not forecast to pose any significant threat to land, according to NBC News.

Tropical storm Humberto had a 10 percent chance of becoming a full-fledged hurricane over the next two days and a 60 percent chance of becoming one by the end of the week, The National Hurricane Center said.