The National Hurricane Center states that "little development is expected during the next couple of days due to strong upper-level winds and proximity to the Yucatan Peninsula".
Typically water temperatures need to be at least 80 degrees for a tropical storm to form.
US forecasters followed suit by issuing a tropical storm watch for parts of the Gulf Coast from the Florida Panhandle southwest of Tallahassee to the New Orleans metropolitan area. The Atlantic Hurricane Season officially begins June 1.
Regardless of whether this becomes a tropical depression or storm, it will provide copious amounts of rain to Florida and parts of the Gulf coast. "A Tropical Storm Watch means that tropical storm conditions are possible in the United States portion of that watch area within 48 hours".
May tropical storms have formed in the Atlantic region several times in the past decade: Arthur in 2008, Alberto and Beryl in 2012, Ana in 2015 and Bonnie in 2016.
Subtropical Storm Alberto has formed over the northwestern Caribbean Sea.
Today, no tropical impact. If it stays to our east, we will still get very heavy rainfall, but it would be more spread out and generally lower totals overall. The storm was moving north-northeast at 6 miles per hour.
Subtropical Storm Alberto could be a rainmaker, but not for Texas
The Air Force's Hurricane Hunters are scheduled to fly out to investigate the storm Friday.
The NHC said people along the central and eastern U.S. Gulf Coast should monitor the progress of Alberto. Rainfall rates in downpours like these can give you more than one inch of rain in 30 minutes or less.
Grand Cayman is also affected by the weather system as the National Weather Service has said that cloudiness and showers will persist over the Cayman area. Wet weather will be most likely in the late afternoon and evening.
A "subtropical" designation means it has characteristics of tropical storm but now lacks the potential of becoming a hurricane.
Sheriff's Capt. Dave DeCarlo, the county's emergency management director, said Citrus should avoid the heaviest of rains, storm surge and winds.
Prior to 2002 subtropical storms were not given names, but the Tropical Prediction Center issued forecasts and warnings on them similar to those for tropical cyclones.