Remnants of Nongfa (20W) – Tropical Cyclone Advisory #5: 1200 UTC 30 August 2025

Nongfa dissipates over Vietnam. This is the last advisory.

Author

Will Weaver
August 30, 2025

…Nongfa dissipates over Vietnam… …This is the last advisory…

Himawari-9 infrared satellite image (Weathernerds)

Current storm information:

  • Position: 18.0°N 104.4°E

  • Movement: WNW at 15 knots (25 km/h)

  • Intensity: 25 knots (65 km/h)

  • Central pressure: 1002 hPa

Trend:

  • N/A

Watches and warnings:

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

Hazards affecting land:

  • The remnants of Nongfa are expected to produce very heavy rainfall over portions of Vietnam, Laos, and Thailand during the next couple of days. Many areas that already saw heavy flooding rainfall from Typhoon Kajiki could see additional rain and flooding. For additional information, refer to products from your local weather office.

Discussion:

Radar data from Vietnam indicates that Nongfa made landfall south of Vinh at about 0730 UTC with an intensity of 35 kts. Since then, the low-level circulation has become very poorly defined and is no longer discernible on available satellite imagery. Also, available surface observations from south of the estimated center location indicate very light westerly winds, a sign that the circulation is no longer closed. Therefore, Nongfa has dissipated and this is the last advisory.

Although Nongfa’s low-level circulation has dissipated, its mid-level circulation remains quite robust and is producing a large area of heavy showers and thunderstorms over portions of Vietnam, Laos, and Thailand. This rainfall will likely cause widespread flooding. Refer to products from your local weather office for additional information.

This is the last advisory on Nongfa.

Forecast positions and maximum winds

  • 00 hrs: 18.0°N 104.4°E – 25 kts inland

  • 12 hrs: Dissipated

JTWC forecast map

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