The heavy rain is not likely to ease until Saturday, although it will not stop entirely, Central Weather Administration (CWA) forecaster Liu Pei-teng (劉沛滕) said Wednesday. Advisories were also issued for northern Keelung, Taipei, and Yilan County, which are expected to see extremely heavy to torrential rain, while other parts of Keelung, New Taipei, and Taoyuan are likely to experience heavy or extremely heavy rain, according to the CWA. Heavy rain is defined as accumulated rainfall of 80 millimeters or more within a 24-hour period or 40 mm or more in an hour, while extremely heavy rain refers to accumulated rainfall of 200 mm or more within 24 hours. The CWA has attributed the recent heavy downpours in northern Taiwan to the influence of the northeast monsoon and a low-pressure system east of the country. While there is little chance that the system will develop into a storm, it is likely to cause continued heavy precipitation in northern Taiwan, Liu said.