The Solomon Islands met office has upgraded its tropical disturbance watch advisory to a tropical cyclone warning for parts of the country.
Forecasters are warning a tropical depression to the south of Solomons is likely to develop into a tropical cyclone.
A tropical cyclone warning is now in force for Makira, Malaita, Guadalcanal, Temotu, Sikaiana, Rennell and Bellona islands.
The country's National Emergency Operations Centre began issuing warnings to people yesterday to prepare for possible flooding and damage if a tropical cyclone hits.
The Fiji met service's duty forecaster, Terry Atalifo, says the system is slow moving at this stage.
"However we have high confidence it will be a cyclone maybe within the six hours so as it moves south, we expect it to intensify as well."
Terry Atalifo says he expects parts of Solomon islands is now experiencing the system with strong winds and rain.