Severe Tropical Cyclone Bianca 2025

Live tracking map, satellite images and forecasts of Severe Tropical Cyclone Bianca 2025 in the South Indian Ocean. Current wind speed 175km/h.

Bianca is located 1095 km southeast of the Cocos Islands, and has tracked south-southwestward at 15 km/h (8 knots) over the past 6 hours. Maximum significant wave height is 10.7 meters (35 feet).

Bianca is forecast to continue tracking south-southwestward along the western edge of the subtropical ridge over the next 24 hours.

After 24 hours, the system will begin tracking more southward as it begins to round the ridge axis. Bianca is forecast to begin subtropical transition in around 36 hours with completion in 2 days, possibly sooner.

Regarding intensity, Bianca is forecast to have peaked and will begin weakening as wind shear starts to increase and sea surface temperatures cool.

In 36 hours, shear is expected to increase to above 55 km/h (30 knots) and sea surface temperatures drop to below 24°C. As a result, an intensity of 100 km/h (55 knots) is forecast as the systems completes subtropical transition.

Model guidance is in good agreement with the exception of NAVGEM, which takes the system further westward than the remainder of guidance. The JTWC track forecast is placed slightly to the east of consensus through the entire forecast period to offset NAVGEM.

Intensity guidance is in moderate agreement. GFS shows a much weaker vortex than the mesoscale models over the next 36 hours. HAFS-A also suggests further intensification over the next 12 hours, differing from the remainder of guidance.

The JTWC intensity forecast is placed slightly below HAFS-A throughout the forecast period with medium confidence.