Hurricane Dorian slammed into the Bahamas on September 1 as a Category 5 storm, one of the strongest Atlantic hurricanes on record to hit land, packing top sustained winds of 185 miles per hour (298 km per hour).
But the potentially heavy rain and winds, which could reach 30 miles per hour (48 km), could hamper relief efforts in the northern Bahamas, where the powerful and slow-moving Dorian flattened thousands of structures and left 70,000 people needing shelter, food and water and medical assistance.
Former Prime Minister Hubert Ingraham said he believed "hundreds" were dead on Abaco "and significant numbers on Grand Bahama", the Nassau Guardian newspaper reported on Thursday.
If the disturbance gets better organized and gains strength, it will be called Humberto, becoming the eighth storm named across the Atlantic in a season that's been slightly more active than the average.
Guterres referred to the Category 5 hurricane that hit the Bahamas earlier this month at a news conference on Thursday.
Island, and 2 to 4 inches of rain was expected, with isolated amounts of 6 inches. Its swells could still affect the coasts of Florida, Georgia, South Carolina and North Carolina in the coming days.
As aid groups rushed shelter material to residents living in the shells of former homes, officials warned that flooding from the fresh storm could hamper their rescue and relief efforts. "As previous storms have taught us, things change very quickly", he said.
Minnis said there were problems coordinating aid due to the level of devastation and he was trying to remove "bureaucratic roadblocks".
"Hospitals are either in ruins, or overwhelmed", Guterres said. "The Bahamas can not be expected to foot this bill alone", he said.
"Schools turned into rubble", the United Nations secretary-general said in a prepared statement ahead of the visit.
Emergency services in the Bahamas say the number of missing following Hurricane Dorian stands at 1,300. "Thousands of people will continue to need help with food, water and shelter".
The Canadian government said it might recall its Canadian Armed Forces crew deployed for humanitarian relief if the impending storm worsened.