Tropical Depression (Invest 91W) – Tropical Cyclone Advisory #1: 0000 UTC 18 September 2025

Another tropical depression forms in the far eastern portion of the basin and is not expected to be a threat to land.

Author

Will Weaver
September 17, 2025

…Another tropical depression forms in the far eastern portion of the basin and is not expected to be a threat to land…

Himawari-9 visible satellite image (Weathernerds)

Current storm information:

  • Position: 23.3°N 164.9°E

  • Movement: W at 7 knots (10 km/h)

  • Intensity: 30 knots (45 km/h) 

  • Central pressure: 1010 hPa

Trend:

  • Some strengthening is forecast during the next 24 hours, and the depression could become a tropical storm later today.

Watches and warnings:

  • There are no land-based watches or warnings in effect.

Hazards affecting land:

  • None.

The next advisory will be posted after 1200 UTC 18 September 2025.

Forecast positions and maximum winds

  • 00 hrs: 23.3°N 164.9°E – 30 kts

  • 12 hrs: 23.0°N 162.8°E – 30 kts

  • 24 hrs: 23.7°N 160.5°E – 35 kts

  • 48 hrs: 24.6°N 156.7°E – 35 kts

  • 72 hrs: 26.0°N 152.4°E – 45 kts

  • 96 hrs: 28.6°N 148.8°E – 55 kts

  • 120 hrs: 29.8°N 148.3°E – 65 kts

JMA forecast map