The 2016 Atlantic hurricane season should be slightly busier than earlier predicted, according to the Colorado State University Tropical Meteorology Project, which upped the number of anticipated tropical storms by one.

In the group’s June forecast, researchers called for 14 storms to form this season which runs from June 1 through October. The new update, released Friday, calls for 15.

The forecast continues to call for six of those storms becoming hurricanes with two of those becoming major hurricanes with winds of 111 miles per hour or greater.

Four named storms have already formed this year with Alex, Bonnie, Colin and Danielle. Alex, which formed in January, stayed out at sea but got strong enough to become the first hurricane of the year. Tropical Storm Bonnie formed in late May before heading ashore in South Carolina.

Tropical Storm Colin formed in early June and went ashore in Florida while Tropical Storm Danielle appeared a few weeks later before striking Mexico.

In late May, the National Oceanic and Atmospheric Administration released a forecast calling for 10 to 16 storms forming this year, four to eight of which could become hurricanes with one to four of the storms strengthening to wind speeds of 111 mph or greater — Category 3, 4 or 5.

Historically, the most active part of the hurricane season is August and September.

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