Typhoon "Peipah" to Impact Central and Southern Japan

Category one hurrican "Lorena" to Impact Northern Mexico and Surrounding Areas

Typhoon Peipah (Tropical Storm level), the 15th typhoon of this year, was located approximately 205 kilometers south of Kagoshima, Japan, at 08:00 on the 4th (Beijing time, same below). The coordinates were 29.7 degrees north latitude and 130.7 degrees east longitude. The maximum wind speed near the center was 8 levels (18 m/s), with a minimum central pressure of 1002 hPa. It is expected to move northeastward at a speed of 20-25 km/h, with little change in intensity, gradually approaching the southern waters of Kyushu Island, Japan. Affected by this typhoon (Figure 1), heavy to very heavy rain is forecasted in southern Japan from the 4th to the 6th, with localized heavy downpours or torrential rains. The cumulative rainfall in most areas is expected to be 50-90 mm, with some regions receiving 100-120 mm, and locally exceeding 150 mm (Figure 2). Coastal areas in southern Japan may experience wind speeds of 8 to 10 levels

Additionally, the center of Category one hurrican "Lorena" in the northeastern Pacific Ocean was located approximately 310 kilometers west of Cabo San Lucas, Baja California Sur, Mexico, at 08:00 on the 4th, specifically at 112.9 degrees west longitude and 23.1 degrees north latitude. It is expected to move northwestward at a speed of around 25 km/h, with its intensity likely to increase slightly. As a result, moderate to heavy rain, with localized heavy downpours or intense rain, is forecasted for the northern parts of Mexico and the southern United States over the next 3-4 days. Accumulated precipitation in most areas is expected to range from 60 to 100 mm, with some parts of northwestern Mexico receiving 120 to 150 mm, and localized areas exceeding 180 mm(Figure 4). Coastal regions in northwestern Mexico and southwestern United States may experience winds of 9 to 11 on the Beaufort scale, with gusts reaching 12 to 14.

Attention should be given to the adverse impacts of strong winds and heavy rain on power infrastructure, transportation, and other sectors in the aforementioned regions. Additionally, there is a risk of secondary disasters such as flooding, landslides, mudslides, and urban waterlogging that may be triggered by the intense rainfall.

Figure 1 Probability Forecast of Typhoon "PEIPAH”Track (Beijing Time, 08:00 September 4, 2025 – 20:00 September 5, 2025)

Figure 2 Forecasted Accumulated Precipitation from September 4 to 6, 2025 (Unit: mm)

Figure 3 Satellite Cloud Image at 08:00 (Beijing Time) on September 4, 2025

Figure 4 Forecasted Accumulated Precipitation from September 4 to 7, 2025 (Unit: mm)

Author: Wang Zeyi,Cao Mai,Cao Yuenan                                  Reviewer: Liu Xiaobo 

English reviewer:Wang Yi                                                                       Issue approver:Dai Kan