Working Group on Tropical Meteorology Research (WG TMR) Workshop: Cyclone Types and Phase Transitions
Workshop:
Cyclone Types and Phase Transitions
11 - 13 November 2025
Online
Purpose:
The Working Group on Tropical Meteorology Research (WGTMR) of the WWRP of WMO is organizing a workshop, in response to Recommendation 14 from the 10th International Workshop on Tropical Cyclones (IWTC-10), which highlighted the need to develop basin-specific approaches to defining cyclone types (tropical, subtropical, extratropical cyclones, medicanes) and their transition pathways, as well as to further develop and share diagnostic techniques building on the cyclone phase space.
Date: 11–13 November 2025
Time: 00:00–02:00 UTC each day
Format: Online (Zoom)
Registration Deadline: 24 UTC, 4 November 2025
The programme will include invited presentations and interactive breakout discussions covering:
Session 1 (11 Nov): Tropical cyclones and the extratropical transition
Session 2 (12 Nov): Medicanes, Subtropical cyclones and tropical transition
Session 3 (13 Nov): Summary and next steps
Please find the tentative agenda:
Date | Time | Title and Speaker |
11 Nov | 00:00-00:05 UTC | Opening remarks Kunio YONEYAMA (WWRP SSC) |
Session 1 Lead : Michelle Simões REBOITA (UNIFEI) Rapporteur : TBD | ||
00:05-00:30 UTC | Phase transitions between tropical, subtropical, and extratropical cyclones: A review from IWTC-10 Kim Wood (UA) | |
00:30-00:55 UTC | Extratropical transition as one example of a tropical cyclone lifecycle within a generalized cyclone phase space Robert Hart (FSU) | |
00:55-01:20 UTC | JMA Operational Analysis/Forecasting on Extratropical Transition of Tropical Cyclones Nao Takamura (JMA) | |
01:20–01:50 UTC | Breakout Discussion | |
01:50-02:00 UTC | Reflections from breakout groups and discussion | |
12 Nov | Session 2 Lead : Wataru YANASE (JMA) Rapporteur : TBD | |
00:00-00:25 UTC | Definition of subtropical cyclone John Beven (NOAA) | |
00:25-00:50 UTC | Cyclone Alfred: Subtropical-to-Tropical Transition and Forecasting Challenges Craig Earl-Spurr (BOM) | |
00:50-01:15 UTC | Physical and operational implications of medicanes' physical definition Emmanouil Flaounas (HCMR) | |
01:15–01:45 UTC | Breakout Discussion | |
01:35-02:00 UTC | Reflections from breakout groups and discussion | |
13 Nov | Session 3 Lead: Parthasarathi MUKHOPADHYAY (IISER, Berhampur) | |
00:00-00:25 UTC | Exploring Cyclone Transitions in AI/ML Weather Models: Preliminary Results from WP-MIP Ron McTaggart-Cowan (ECCC) | |
00:25-00:35 UTC | Session 1 Rapporteurs- presentation | |
00:35-00:45 UTC | Session 2 Rapporteurs- presentation | |
00:45-00:55 UTC | Reflection from Co-chairs | |
00:55-01:30 UTC | Discussion on Gaps and Priorities | |
01:30-02:00 UTC | Closed meeting by invitation | |
Organizing Committee:
Michelle Simões REBOITA, Universidade Federal de Itajubá, Brazil
Wataru YANASE, Japan Meteorological Agency, Japan
Zhuo WANG, University of Illinois, United States of America
Parthasarathi MUKHOPADHYAY, Indian Institute of Science Education and Research (IISER, Berhampur), India
Contact: Liye LI, WWRP Secretariat, lli@wmo.int