First Plum Rain Front Arrives; Possible Typhoon Developing Near Guam

Taiwan's first plum rain front of the 2026 season arrived Sunday evening, bringing much-needed precipitation across the island that is expected to continue through Wednesday morning. The Central Weather Administration (CWA) issued strong wind advisories for 14 counties as the frontal system moved across the Taiwan Strait, with northern and northeastern regions receiving the heaviest rainfall. The plum rain season — known locally as "meiyu" — is a critical weather pattern that typically spans May and June, delivering the bulk of Taiwan's pre-summer water supply.

The arrival of the plum rains comes as a relief for water resource managers who have been monitoring reservoir levels closely following a relatively dry spring. Taiwan's reservoirs, particularly in the central and southern regions, depend heavily on plum rain and subsequent typhoon season precipitation to sustain agricultural irrigation and semiconductor industry water demands through the dry winter months. The CWA has cautioned that while the current front is welcome, its intensity remains moderate, and a sustained pattern of fronts will be needed to fully replenish water reserves.

Meanwhile, meteorologists are tracking a tropical disturbance near Guam that shows potential for development into a typhoon around Thursday or Friday. Current forecast models suggest the system has less than a 10 to 15 percent chance of directly affecting Taiwan, with most projections showing it curving northeastward toward Japan or dissipating over open water. The CWA emphasized that early-season tropical systems are notoriously difficult to predict and advised residents to monitor updates as the system evolves.

The concurrence of the plum rain front and the distant tropical disturbance highlights the complexity of Taiwan's May weather patterns, where continental frontal systems from the northwest interact with warm, moisture-laden tropical air masses from the Pacific. Authorities reminded residents in mountainous areas to remain alert to the risk of landslides and flash flooding during periods of sustained heavy rain.