Tomorrow's Weather / Good Weather Is Gone! Dual Typhoons Bring Extended Rainfall Across Taiwan – '10 Consecutive Days of Heavy Rain' – Full Weekly Forecast

Meteorologist Wu Derong indicates that Tropical Storm Changho is expected to make landfall in Ibaraki Prefecture, Japan, late tonight (11th) through early tomorrow morning. Landfalls in this region are historically rare, and despite Changho being a minimal typhoon, it will bring torrential rains and strong gusty winds to the Kanto, Tohoku, and Tokai regions. Meanwhile, Taiwan is under dual influence from the monsoon gyre (MG) and southwest monsoon flow, resulting in extremely unstable atmospheric conditions. Experts warn that from Friday to the weekend (August 14–16), enhanced southwest winds will expand rainfall significantly south of Miaoli. Furthermore, starting next week (after the 17th), a broad low-pressure zone will approach closer to Taiwan, potentially prolonging unsettled weather into the first half of August.

Changho Makes Landfall in Japan – Could Typhoon Nanika Follow? Latest Northwest Pacific Tropical Systems Update

The Northwest Pacific is currently very active with multiple tropical systems. Wu Derong and meteorologist Wu Shengyu have analyzed the latest trajectories:

- Typhoon Changho: Expected to make landfall in Ibaraki Prefecture tonight into early tomorrow, then cross Honshu while gradually weakening. Kanto and Tohoku regions should remain vigilant for heavy rainfall. - Typhoon Banyan and TD-18: Both systems are moving toward the open ocean and may merge before dissipating. No impact on East Asian landmasses. - Tropical Disturbance 91W (potential Typhoon Nanika): Located south of Japan, it may develop into a tropical depression or the 17th typhoon, 'Nanika,' tracking northward along the monsoon gyre. If formed, it could approach Japan again. - Tropical Disturbance 90W: Located at the outer edge of the monsoon gyre, slowly moving westward. Its development remains under observation.

Weekend Rainfall Expands Across Taiwan – South of Miaoli on Alert for Heavy Rains as Southwest Winds Strengthen

Taiwan’s weather this week is undergoing a two-stage shift due to a low-pressure system left by Typhoon Bailu enhancing southwest monsoon flow:

August 11–13 (Monday to Wednesday) Southwest winds are moderate but carry abundant moisture. Intermittent showers and thunderstorms are expected throughout the day south of Chiayi. Elsewhere, isolated afternoon thunderstorms may intensify.

August 14–16 (Friday to Weekend – Rain Intensifies) A continental low-pressure system, reinforced by a northern trough, is moving northeastward, strengthening southwest winds and increasing moisture around Taiwan. Windward areas (south of Miaoli) will see expanded rainfall. Northern and eastern regions will also experience more intense afternoon thunderstorms, making weekend weather highly unstable.

Beyond August 17 (Next Week Outlook) The center of the monsoon gyre is expected to shift westward toward Taiwan and the northern South China Sea. A new system may approach from the east, moving northward near Taiwan’s offshore waters. Unsettled weather could persist through the first half of August, with clearer skies only likely in the latter half as the Pacific high pressure reasserts control.

10-Day Weather Outlook – Two-Phase Rainfall Timeline

Affected by the monsoon gyre and southwest monsoon, the two-week weather trend is as follows:

Phase One: Now through August 15 (Highly Unstable Atmosphere, Weekend Rain Expands) - Windward Areas (Central & Southern Taiwan): Direct impact from southwest flow. Showers and thunderstorms south of Chiayi; expanding to south of Miaoli from Friday. - Northern and Eastern Taiwan: Watch for strong afternoon convective thunderstorms. Hot and humid during dry periods – heatstroke prevention is critical.

Phase Two: August 16–20 (Low-Pressure Zone Lingers Near Taiwan) - Wind Shift: Southwest winds gradually transition to northeasterly as the monsoon gyre center approaches. - Weather Pattern: High moisture across Taiwan, extremely unstable atmosphere. Isolated showers possible anywhere, with vigorous afternoon convection. - Expert Advisory: Convective intensity varies daily. Public is urged to monitor the latest weather alerts and carry rain gear at all times.

One-week rainfall forecast. (Image: Central Weather Administration)

One-week temperature forecast. (Image: Central Weather Administration)