TC Harold

The director of the national disaster office, Loti Yates, said much of the plains are under water after days of torrential rain, and several villages have lost their food source.

Mr Yates said the plains also supply much of the food for the densely-populated capital, Honiara.

"These are the communities that are actually feeding Honiara and the markets, and so that's going to impact on their livelihoods as well. So it's going to be a huge challenge for us."

It is understood the vessel MV Taimareho was carrying passengers from the capital Honiara to West Are Are in Malaita Province last night when it encountered bad conditions.

The Solomon Islands Maritime Rescue Coordination Centre says it only received word of the stricken ship's ordeal late this morning, and its officers are scrambling to launch a rescue operation.

According to the cente, the vessel encountered very rough seas and strong winds whipped up by Cyclone Harold between 2am and 3am this morning - a number of passengers were washed overboard.

The Solomon Islands Meteorology Service said a Tropical Cyclone Warning is current for all Solomon Islands provinces.

The category 1 system is slamming Solomon Islands as it makes it way down the country, heading towards Vanuatu.

On Friday, the Director of the Director of the National Disaster Management Office, Loti Yates, said at least two ships had been washed ashore, fallen trees were blocking roads and the power was out in many areas.