Taipei: Heat alerts took effect in Tainan and Kaohsiung cities and Pingtung County in southern Taiwan on Tuesday morning as a Pacific high-pressure system strengthened, according to the Central Weather Administration (CWA).According to Focus Taiwan, the CWA issued an "orange" heat advisory for parts of Tainan and Pingtung, indicating that daytime highs could hit 36 degrees Celsius or higher for three consecutive days. Meanwhile, a "yellow" heat alert was issued for Dashu District in Kaohsiung, suggesting that it could see daytime highs of 36 degrees on Tuesday.Elsewhere around Taiwan, daytime highs are expected to reach 29-32 degrees, the CWA reported, and it warned that sunny skies will lead to dangerously high ultraviolet (UV) levels, particularly around noon. Additionally, the CWA issued a dense fog advisory for the Kinmen and Matsu islands on Tuesday, warning of visibility of less than 200 meters.On Wednesday, the CWA anticipates a weather front to arrive, bringing brief showers to northern Taiwan. Despite this, the strength of the weather system is expected to be limited, reducing temperature highs by only 1-2 degrees, while summer-like weather in central and southern Taiwan will continue.The CWA further noted that the weather front is expected to begin weakening Thursday before seasonal northeasterly winds set in Friday, affecting northern Taiwan over the weekend.