JTWC Issued: 0900 UTC 11 Dec 2025
The area of convection (invest 91S) previously located near 5.7s 100.1E is now located near 7.3s 101.3E, approximately 395 nm northeast of the cocos islands. Animated enhanced infrared (EIR) satellite imagery depicts a consolidating low level circulation center obscured by deep convection in the upper levels. An 110223z MetOp-C 25km ASCAT pass depicts elevated winds (25-30 kts) in the north-northwestern periphery of the circulation. Environmental analysis reveals a favorable environment for development with low (5-10 kts) vertical wind shear and warm (28-29 c) sea surface temperatures. While 91S has good poleward and equatorward upper level outflow, it is currently being restricted on the eastern side of the circulation. Deterministic and ensemble models are in agreement on a steady development as it transits southwestward away from sumatra and continues to consolidate over the next 24-36 hours.maximum sustained surface winds are estimated at 25 to 30 knots.minimum sea level pressure is estimated to be near 1006 mb. Thepotential for the development of a significant tropical cyclonewithin the next 24 hours is upgraded to high. See ref a (wtxs21 pgtw 110900) for further details.