At 11 a.m., the depression was near latitude 13.2 north, longitude 42.6 west, about 1,260 miles east of the Lesser Antilles and about 2,600 miles from Palm Beach. It had top sustained winds of 30 mph. The system was moving west-northwest at 21 mph, up from 17 mph at the 5 a.m. advisory.
“Little change in strength is forecast during the next 48 hours, and the depression is not currently expected to become a tropical storm,” the advisory repeated.
“A continued west-northwestward motion with an additional increase in forward speed is expected over the next 48 hours,” the center said in a 5 a.m. advisory. “Little change in strength is forecast during the next 48 hours, and the depression is not currently expected to become a tropical storm.”
A 5 a.m. advisory placed the storm at latitude 13.2 north, longitude 40.0 west. That’s about 1,435 miles east of the Lesser Antilles, and about 2,800 miles from Palm Beach.
It was heading west-northwest, and its forward sped had increased to 17 mph.
The advisory said the depression had top sustained winds of 30 mph. A system must attain top sustained winds of 39 mph to become a tropical storm and 74 mph to become a hurricane.
Forecasters say a tropical system in the open Atlantic still could become a depression as early as Wednesday, but on Wednesday afternoon dropped the odds of that happening from 70 percent to 60 percent.
The 2 p.m. outlook said the low pressure system, now about 850 miles west-southwest of the Cape Verde Islands and some 3,000 miles from the southeastern United States, “still has
the potential to become a tropical depression before it moves west-northwestward into a drier and more stable air mass during the next day or two.”
“Gradual development of this system is likely,” hurricane center forecaster John Cangialosi said in an advisory. “The disturbance is expected to begin moving west-northwestward in a day or so, and it should continue moving in that direction through the remainder of the week.”
The official start of the 2016 hurricane season is June 1, but the atmosphere is brewing up a little preview that may form into a tropical system by Memorial Day.
Meteorologists are watching forecast models that show an area of low pressure forming near the Bahamas that has the potential to become the season’s first tropical depression with a path toward Florida, Georgia and the Carolinas.
Andy Mussoline, senior meteorologist with the Pennsylvania-based AccuWeather, said the system is a signal that weather patterns are shifting, making things more favorable in the Atlantic for hurricanes.
“We think any development that would occur later this week will be slow with a tropical depression likely the beginning,” Mussoline said. “We have warm water, low wind shear. Something may show up as early as Thursday.”
While a few days ahead of schedule, early tropical development has some precedents.
Hurricanes have formed in every month but February.
Last year, Tropical Storm Ana opened the 2015 hurricane season with a May 9 debut.
This year, Hurricane Alex formed Jan. 14, making it only the second January-born Atlantic hurricane on record.
Other hurricanes refusing to adhere to man’s calendar include Alice, which formed Dec. 31, 1954, but managed to live through the New Year before dissipating Jan. 4. Another tropical storm dubbed Ana formed April 20 in 2003, while Tropical Storm Alberto was named May 19, 2012. Alberto was followed just days later by Tropical Storm Beryl, which formed May 26.
While January’s Hurricane Alex was more of a hold-over from the 2015 storm season, its formation date on the calendar made it a 2016 storm.
That means if the system being watched by forecasters develops, it would be named Bonnie.
But some forecasters aren’t ready to fire up the season just yet.
The National Hurricane Center in Miami has not identified the low pressure system that may develop as one to watch for potential tropical characteristics, and Jeff Masters, co-founder and director of meteorology for Weather Underground, confirmed an area of low pressure is expected to form but said the forecast is more muddled from there.
“The models have widely differing ideas on how much wind shear might be present, so it is too early to say if this system is a legitimate threat to develop into a tropical depression,” Masters said Monday.
Tropical cyclones are unique in that they have warmer temperatures at their centers — so called “warm cores” — that are able to sustain the strength of the storm over long distances.
But they need warm ocean waters and low wind shear to prosper — ingredients AccuWeather forecasters say are there.
Ocean temperatures are about 80 degrees with light winds that are expected to remain that way into next week.
Whether a tropical system forms, showers and thunderstorms are expected to increase from Florida to the Carolinas later this week and through Memorial Day with increasingly dangerous surf conditions.
“We think any development will be slow,” Mussoline said. “But we have warm water, low wind shear and high atmospheric moisture, which, combined, can mean tropical formation.”