The low pressure system posing cyclone threats to Samoa has been upgraded in severity as it continues to move towards the country, the Samoa Meteorology Division has warned. 

On Saturday afternoon, the system, currently west of Tuvalu was upgraded into Tropical Disturbance 07F at a point of about 1060km northwest of Apia.

"The system is expected to intensify as it moves southeast near our forecast area by tomorrow afternoon," a spokesman for the meteorology division said on Saturday. 

"However, an active convergence zone which is also links to the above-mentioned system is currently impacting the island with heavy rain and gusty wind."

The MET Office warns that winds and rough seas are expected to increase today. 

Samoa will be hit by heavy downpour; poor visibility; strong and gusty winds with possible flying objects; foggy and slippery roads over mountain passes and ranges; strong river outflow and landslides; and pooling near roadsides and waterways. 

Meanwhile, a trough of low pressure located over Samoa has now shifted to the country's southeast.

However, it will still bring heavy rain activities impacting the island from a convergence zone linked to a broad area of the low pressure system located to the northwest of Samoa.