It could be days before aid reaches Vanuatu's isolated Torres Islands, with Cyclone Donna making travel too risky for response teams.
Winds reaching more than 200km/h struck the province of Torba on Saturday, with homes and other buildings damaged.
The cyclone briefly doubled back overnight, bringing severe winds and flooding to the northern islands before continuing its trajectory southwest. The storm, now upgraded to category 4, is currently sitting over northern Vanuatu.
Red Cross Vanuatu coordinator Dickinson Tevi told Newshub on Sunday the islands are experiencing major issues with water access and quality, after supplies in the north were contaminated during heavy downpours.
Access to fresh food is also going to be a major issue.
"They think they have enough food for the next two to three weeks, then after that they might need help," Mr Tevi said.
He said it's currently a "wait and watch" situation as they wait for a clear break with supplies ready to go.
"We will have a meeting today to discuss the planning we'll do - Red Cross will have to do a blanket distribution."