"Due to its very small size, there is greater-than-usual uncertainty in the analysis of Beryl's current intensity, and confidence in the official intensity forecast is also lower than normal", the NHC said.
Tropical Storm Beryl has become the first Atlantic hurricane after strengthening overnight, according to National Hurricane Center. If this storm reaches Tropical Storm status, it would be given the name, "Chris".
At 11 p.m. EDT, the storm was centred about 195 miles (315 kilometres) south-southeast of Cape Hatteras with maximum sustained winds of 30 mph (48 kph).
As of 5 pm ET on Thursday, Beryl had winds of 50 miles per hour and was moving to the west at 16 miles per hour. Lojero also warned that the storm is expected to dump up to four inches (10 centimeters) of rain and could unleash landslides. Beryl is expected to gradually weaken over the Caribbean early next week and may no longer be an organized tropical cyclone once it reaches Hispaniola.
Rescuer says conditions good for extraction
Osatanakorn had said on Friday that oxygen levels in their part of the cave had fallen to 15% - down from healthy levels of 21%. A military operation - called "Wild Boar" - has commenced to rescue the boys, aged 11 to 16, and their 25-year-old coach.
Beryl could still be a hurricane when it reaches the Lesser Antilles late Sunday or Monday.
The Met Office added that people in areas prone to flooding, landslides and falling rocks are advised to be extremely vigilant and to exercise extreme caution as life-threatening flash flooding is possible from Sunday night.
A tropical depression has formed west of Bermuda as Hurricane Beryl continues its path towards the Caribbean.
And yet, Berg said the conditions ahead of Beryl could allow it to strengthen a bit over the next few days as it heads for the island chain extending from the Virgin Islands to Grenada.
According to the NOAA, Beryl is now 1,140 miles off the coast of the Lesser Antilles.
The National Hurricane Center's long-range forecast has Tropical Depression Three becoming a hurricane - which would be the third of 2018 - by mid-week as it moves away from the U.S. The depression will move slowly to the northwest toward the Carolina coast this weekend before slowly looping to the north, east, and then southward.