Tropical Storm Arlene forms in the Atlantic
During its afternoon advisory, the National Hurricane Center designated Arlene as the first Atlantic Basin Tropical Storm of 2017. Tropical Storm Arlene was upgraded from Subtropical Depression One when winds hit a sustained 45 mph. Subtropical Depression One formed Wednesday morning in the Atlantic Ocean.
Arlene is not forecast to impact the United States and should remain far out to sea as a "fish storm." The official NHC forecast calls for Arlene to maintain Tropical Storm strength for less than 12 hours before becoming post-tropical and then dissipating in 24 hours.
Arlene is unique because Tropical Storms usually don't form in April. It is only the second observed Tropical Storm to form during the month of April in the satellite era. In its Forecast Discussion, the NHC notes that prior to the satellite era, this type of system would have been very difficult to detect.
While the the start of hurricane season begins on June 1, preseason storms aren't totally unheard of.
The 2016 Atlantic hurricane season featured January's Hurricane Alex, which was considered a carry-over from the 2015 season, and May's Tropical Storm Bonnie flooded portions of the South Carolina Lowcountry.
The 2015 Atlantic Hurricane Season featured Tropical Storm Ana which formed in early May and made landfall near North Myrtle Beach in Horry County. The 2012 season featured two May Tropical Storms: Alberto, which impacted coastal South Carolina, and Beryl which brought overland rains to the Palmetto State.
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