The storm circle of Typhoon Qiangpi covers the entire Taiwan, with the intensity reaching the upper limit of Central Taiwan. The Category 7 storm circle covers the entire Taiwan for 320 kilometers, bringing strong winds. People should pay attention.
The storm circle of Typhoon Qiangpi envelopes the entire Taiwan. Its center is 140 kilometers southeast of Yilan this afternoon (23rd). The Central Meteorological Administration predicts that it will circle offshore for a while before heading north. Regarding its path, experts analyzed that it is mainly It is caused by three environmental conditions that cause its short-term irregular movement; while the wind brought by Qiangpi is stronger than the rain, it is driven by six factors such as terrain, air pressure, and narrow tube effect. It reminds the public that the real strong wind has not yet come, and the public needs to be more careful.
In response to changes in Qiangpi's future path, Lin De'en, a Ph.D. in atmospheric sciences at National Taiwan University, said that Qiangpi's current moving speed has slowly slowed down from its original speed of 20 kilometers per hour to 9 kilometers per hour. However, this is not due to a weakening in intensity, but due to changes in three major environmental conditions. The first is to control the The "environmental flow field" that controls the typhoon causes the airflow to weaken, the second is that Qiangpi will turn northward from the north-northwest, causing it to slow down, and the third is that Taiwan's terrain interferes with the low-level circulation of the typhoon. These three factors all slow down Qiangpi, resulting in short-term irregular movements. However, once it completes its northward turn, bypasses the terrain, and reconnects with the environmental flow field, Qiangpi will accelerate northbound, reaching a speed of at least 15 kilometers per hour.
The winds brought by Qiangpi are currently stronger than the rain. Lin Deen analyzed that there are mainly 6 factors, including: 1. Qiangpi was originally downgraded from a strong typhoon to a moderate typhoon, but it is still the upper limit of China and Taiwan, bringing more wind and waves. Large; 2. The radius of Qiangpi's Category 7 storm is very large (320 kilometers), covering the entire Taiwan and bringing more scope of influence; 3. When Qiangpi approaches Taiwan, although there is no accompanying effect with the northeasterly wind, there is a common influence. The combination of its northern tributaries and northeasterly winds can easily bring about local gusts; 4. The pressure gradient of the cold high pressure in the north increases, which can easily cause strong winds; 5. The strong wind belt of Qiangpi also has the opportunity to receive bonus effects when it encounters Taiwan's terrain; 6 The peripheral circulation of Qiangpi is affected by the Central Mountains of Taiwan and the Wuyi Mountains of Fujian, China, forming a "narrow tube effect" in the Taiwan Strait. The airflow enters the narrow tube from a wide place, and the resulting wind speed will also increase faster and stronger.
Lin Deen reminded that the real strong winds brought by Qiangpi "have not yet come!" The strongest wind speed is expected to fall from tonight to tomorrow morning, especially the circulation of the typhoon's eye wall, so people need to be more careful. At 4 p.m., the Meteorological Administration continued to issue onshore strong wind warnings for a total of 17 counties and cities, including Keelung City, New Taipei City, Taoyuan City, Hsinchu City, Miaoli County, Taichung City, Changhua County, Yunlin County, Chiayi County, Tainan City, Kaohsiung City, Pingtung County, Taitung County, Hualien County, Yilan County, Penghu County, and Lianjiang County, with the risk of blowing average winds above level 9 or gusts above level 11.
