Current Snapshot
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By PDC’s Senior Weather
Specialist Glenn James

The Pacific Disaster Center’s (PDC Global) Wednesday, January 22, 2025, Tropical Cyclone Activity Report…for the Pacific Ocean, the Indian Ocean, and adjacent Seas
Current Tropical Cyclones:
Tropical Cyclone 10S (Sean) is located approximately 536 NM southwest of Learmonth, Australia
Northeast Pacific Ocean: There are no Tropical Cyclones
The last regularly scheduled Tropical Cyclone Activity Report of the 2024 eastern North Pacific Hurricane Season has been issued. Routine issuance of this section of the PDC product will resume on May 15, 2025. During the off-season, Special Tropical Weather Outlooks will be issued as conditions warrant by the NHC.
Central Pacific Ocean: There are no Tropical Cyclones
The 2024 central North Pacific hurricane season has ended. As such, the final routine Tropical Cyclone Activity Report for the 2024 season has been issued. Routine issuance of this section of the PDC product will resume on June 1, 2025. During the off-season, Special Tropical Weather Outlooks will be issued as conditions warrant by the CPHC.
Western Pacific, Indian Ocean, and adjacent Seas:
South Indian Ocean
Tropical Cyclone 10S (Sean)
According to the JTWC Warning number 21, sustained winds are 40 knots, with gusts to near 50 knots
Animated visible satellite imagery depicts well-defined, but shallow low level circulation center (llcc), with a broad area of smooth, stable, low-level clouds wrapping around the majority of the circulation. Another image showed the very shallow nature of the circulation, with even the high resolution band having a hard time picking up any significant features in the banding features.
The environment is highly unfavorable, characterized by cool sea surface temperatures, high westerly vertical wind shear, and relatively deep dry air above. Poleward outflow remains strong but even with this strong exhaust mechanism, the lack of energy from below means there is no significant convection
associated with the system.
TC 10S has now rounded the str axis and is very slowly starting to turn towards the southeast. A slow
acceleration can be seen in the animated visible and proxy visible imagery but the system is overall still moving fairly slowly, at about 3 knots. Over the next few hours, the system is expected steadily accelerate as it moves further away from the ridge axis and tracks southeastward along the southwestern periphery of the str over Australia.
The environment, already highly unfavorable, will not improve going forward. the only thing keeping the system alive is momentum conservation. TC 10S is already undergoing subtropical transition (stt). However, it is also simultaneously weakening and the current forecast calls for the system to weaken below warning criteria, within the next 24 hours, prior to completing stt.