Extratropical Transition Phenomena in Tropical Cyclones
Summary
Tropical cyclones that recurve into mid-latitudes often undergo extratropical transition (ET), a process by which a compact, symmetric warm-core system acquires the asymmetric, frontal characteristics of an extratropical cyclone. As the storm interacts with midlatitude temperature gradients and upper-level jet streams, baroclinic conversion converts available potential energy into kinetic energy, enlarging the wind field and shifting the peak winds poleward. Latent heat release and potential vorticity anomalies aloft further modulate the transition, giving rise to diverse life-cycle pathways such as classic ET, warm seclusion and merge-driven transformation. The resultant extratropical cyclones typically affect broader regions, with integrated kinetic energy and precipitation fields extending well beyond the original tropical footprint. In a warming climate, while ET event frequency may remain relatively stable, the destructiveness of these post-tropical storms is projected to intensify due to stronger winds, heavier rainfall and altered jet-stream patterns. Improved understanding of ET dynamics is crucial for operational forecasting, hazard assessment and midlatitude resilience against compound wind and flood impacts.
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Extratropical Transition Phenomena in Tropical Cyclones publication trend
The graph below shows the total number of articles in extratropical transition phenomena in tropical cyclones across all publications each year (not limited to Nature Index journals).
Technical terms
Extratropical transition (ET): The transformation of a tropical cyclone from a symmetric warm-core structure into an asymmetric extratropical system with fronts and broadened wind fields.
Warm-core: A thermal structure in which the cyclone’s central region is warmer than its surroundings in the upper troposphere, characteristic of tropical systems.
Baroclinic conversion: The dynamical process by which horizontal temperature gradients convert potential energy into the kinetic energy of a cyclone.
Integrated kinetic energy: A measure of a cyclone’s total kinetic energy obtained by integrating the square of wind speed over a defined area.
Frontogenesis: The intensification of horizontal temperature gradients that leads to the formation or strengthening of meteorological fronts.
References
- Global increase in destructive potential of extratropical transition events in response to greenhouse warming. npj Climate and Atmospheric Science (2023).
- Changes in Tropical Cyclones Undergoing Extratropical Transition in a Warming Climate: Quasi‐Idealized Numerical Experiments of North Atlantic Landfalling Events. Geophysical Research Letters (2023).
- Multiple Dynamics of Precipitation Concentrated on the North Side of Typhoon Hagibis (2019) during Extratropical Transition. Journal of the Meteorological Society of Japan Ser II (2022).
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