Marathon versus Sprint: Two Modes of Tropical Cyclone Rapid Intensification in a Global Convection-Permitting Simulation

Tropical cyclones that intensify abruptly experience “rapid intensification.” Rapid intensification remains a formidable forecast challenge, in part because the underlying science has not been settled. One way to reconcile the debates and inconsistencies in the literature is to presume that differen...

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Bibliographic Details
Published in:Monthly weather review Vol. 151; no. 10; pp. 2683 - 2699
Main Authors: Judt, Falko, Rios-Berrios, Rosimar, Bryan, George H.
Format: Journal Article
Language:English
Published: Washington American Meteorological Society 01.10.2023
Subjects:
Awareness-raising
Convection
Cyclones
Environmental conditions
Hurricanes
Marathons
Meteorologists
Modes
Sea level
Shear
Simulation
Tropical cyclones
Vortex structure
Vortices
Wind shear
ISSN:0027-0644, 1520-0493
Online Access:Get full text
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Summary:Tropical cyclones that intensify abruptly experience “rapid intensification.” Rapid intensification remains a formidable forecast challenge, in part because the underlying science has not been settled. One way to reconcile the debates and inconsistencies in the literature is to presume that different forms (or modes) of rapid intensification exist. The present study provides evidence in support of this hypothesis by documenting two modes of rapid intensification in a global convection-permitting simulation and the HURDAT2 database. The “marathon mode” is characterized by a moderately paced and long-lived intensification period, whereas the “sprint mode” is characterized by explosive and short-lived intensification bursts. Differences between the modes were also found in initial vortex structure (well defined versus poorly defined), nature of intensification (symmetric versus asymmetric), and environmental conditions (weak shear versus strong shear). Collectively, these differences indicate that the two modes involve distinct intensification mechanisms. Recognizing the existence of multiple intensification modes may help to better understand and predict rapid intensification by, for example, explaining the lack of consensus in the literature, or by raising awareness that rapid intensification in strongly sheared cyclones is not just an exception to a rule, but a typical process.
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ISSN:0027-0644
1520-0493
DOI:10.1175/MWR-D-23-0038.1