Taipei, Nov. 21 (CNA) A weather front consisting of northeasterly winds is expected to arrive Wednesday night and send temperatures lower around Taiwan, according to the Central Weather Bureau (CWB).

Temperatures are likely to fall to 18 degrees at night in northern and northeastern Taiwan and to 19-20 degrees in central and southern parts of the country, the CWB said.

The northeasterly winds are also expected to bring sporadic showers at night, in particular in northern Taiwan and Yilan in the northeast and mountainous areas in central and southern parts of Taiwan, according to the CWB.

Before the weather system starts to affect Taiwan, sunny skies are expected around Taiwan during the day Wednesday, with daytime temperatures in northern Taiwan forecast to hit 28-30 degrees Celsius, up 3-4 degrees from a day earlier, the CWB said.

The highs in central and southern Taiwan are expected to hit 30 degrees Wednesday, little changed from Tuesday, the CWB said.

The CWB also said northeasterly winds are also expected to deliver strong winds in areas north of Tainan and eastern Taiwan, including Green Island and Orchid Island, the Hengchun Peninsula, and the outlying Penghu, Kinmen and Matsu islands.

As the northeasterly winds intensify, temperatures could fall further on Thursday, with additional strong winds possibly hitting Taiwan during the day, the CWB said.

A tropical storm, meanwhile, was located 3,900 kilometers east-southeast of Taiwan as of 2 a.m., moving in a west-northwesterly direction, while a tropical depression has formed in the waters off the Philippines, but the two are unlikely to affect Taiwan, the CWB said.

Air quality in parts of the country, such as northern Taiwan, Yilan, Hualien, Taitung and the outlying Kinmen and Matsu islands, was expected to be good to fair on Wednesday, according to the Environmental Protection Agency (EPA).

But due to the lack of wind to disperse atmospheric pollutants, the Air Quality Index (AQI) was flashing an “orange alert” in central Taiwan, Yunlin, Chiayi, Tainan, Kaohsiung and Pingtung, indicating unhealthy levels of pollutants for sensitive groups, according to the EPA.