Marek Kučera 
As of early June 2025, Tropical Depression 91W (also known as Invest 91W) is a developing low-pressure system located in the western Pacific Ocean, near the southeastern coast of China and Taiwan, with a forecast to hit Southern Japan.
Current Observations
- Location: Approximately 22.8°N, 119.0°E, about 500 miles south of Kadena Air Base, Okinawa.
- Movement: Northward at 3 knots (5 km/h).
- Intensity: Maximum sustained winds of 15 knots (28 km/h).
- Pressure: Central pressure around 1005 hPa.
The 2025 Western Pacific typhoon season is anticipated to be an active to above-average season, influenced by ongoing climatic patterns and oceanic conditions. Forecasters predict a higher frequency of tropical cyclones due to warmer sea surface temperatures across the region, which provide ample energy for storm development.
Key factors shaping the season include:
- El Niño-Southern Oscillation (ENSO): A potential weak El Niño phase is expected to develop or continue, typically enhancing typhoon activity in the Western Pacific by increasing ocean heat content and atmospheric instability.
- Sea Surface Temperatures (SSTs): Elevated SSTs in the tropical Pacific and South China Sea will likely fuel stronger and longer-lasting storms.
- Atmospheric Conditions: Reduced vertical wind shear in key development areas could allow more tropical depressions to intensify into typhoons.
- Impact Zones: Countries such as the Philippines, Taiwan, Japan, southeastern China, and parts of Southeast Asia should prepare for an increased risk of landfalls, heavy rainfall, flooding, and strong winds.
Source: https://www.tropicaltidbits.com/storminfo/#91W
