In an already busy Atlantic hurricane season, Tropical Storm Dolly is now the fourth named storm of 2020 after forming Tuesday far from land over the North Atlantic.

The National Hurricane Center (NHC) said that tropical depression four strengthened into Tropical Storm Dolly. The storm was centered Tuesday afternoon nearly 400 miles south-southeast of Halifax, Nova Scotia, and moving to the east-northeast at 13 mph.

"A turn toward the northeast with an increase in forward speed is expected tonight and on Wednesday," the NHC said.

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Forecasters from the NHC said that satellite-derived wind data indicate that maximum sustained winds have increased to near 45 mph, with higher gusts.

Tropical Storm Dolly formed Tuesday in the North Atlantic.

Tropical Storm Dolly formed Tuesday in the North Atlantic. (Fox News)

Unlike the previous three storms so far this year, Dolly isn’t a threat to the U.S. or any land and will become non-tropical Wednesday as it moves over much colder ocean water.

Water temperatures are currently just barely warm enough to support tropical development at this latitude

Tropical Storm Dolly is forecast to weaken as it moves over much colder water in the next couple of days.

Tropical Storm Dolly is forecast to weaken as it moves over much colder water in the next couple of days. (Fox News)

From here the storm will move northeast and quickly run into waters too cold to support further development.

Dolly will become a non-tropical storm by midweek.

Dolly is a reminder of the active season forecast to come as it is the third earliest formation for the 4th named storm in a year.

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Looking forward in the days ahead, dry Saharan air has blown off the coast of Africa and filled the lower latitudes into the Caribbean and the southern U.S.

This dry air will hamper tropical development for at least the next week.

So far in 2020, two tropical storms, Arthur and Bertha -- both in the Atlantic -- already formed this year in May.

Named tropical storms so far this 2020 Atlantic hurricane season.

Named tropical storms so far this 2020 Atlantic hurricane season. (Fox News)

The third named storm, Cristobalswept from Louisiana to the Upper Midwest earlier this month, bringing high winds and heavy rain.

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There are as many as 13 to 19 named storms predicted during the Atlantic hurricane season, which runs from June 1 to Nov. 30, forecasters from the National Oceanic and Atmospheric Administration's (NOAA) Climate Prediction Center (CPC) said last month.

Hurricane season lates from late August through early October.

Hurricane season lates from late August through early October. (Fox News)

Six to 10 of those could develop into hurricanes, with winds of 74 mph or more, and three to six could even become major hurricanes, capable of inflicting devastating damage.

The 2020 Atlantic hurricane season may include above-average activity. Here are what researchers at Colorado State University are forecasting, compared to average.

The 2020 Atlantic hurricane season may include above-average activity. Here are what researchers at Colorado State University are forecasting, compared to average. (Fox News)

This forecast is well above the averages of 12 named tropical stormssix hurricanes, and three major hurricanes during the season.

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The list of names for the 2020 Atlantic hurricane season.

The list of names for the 2020 Atlantic hurricane season. (Fox News)

The 2020 Atlantic Hurricane Season runs from June 1 to Nov. 30, and will include the names: Arthur, Bertha, Cristobal, Dolly, Edouard, Fay, Gonzalo, Hanna, Isaias, Josephine, Kyle, Laura, Marco, Nana, Omar, Paulette, Rene, Sally, Teddy, Vicky, and Wilfred.

Fox News' Travis Fedschun contributed to this report.