Storms in Motion: Unraveling 75 Years of Tropical Cyclone Patterns (1950–2024)

Key findings from this study

• The study found that the Western Pacific basin concentrated the highest tropical cyclone frequency across all 75 years, with persistent intensification patterns detected by geostatistical methods.
• The researchers report that La Niña phases significantly increased landfall events in the North Atlantic and Southern Indian Ocean, while El Niño phases elevated activity in the North Indian and Eastern Pacific basins.
• The study identified substantial shifts in spatial cyclone clusters over decadal timescales across multiple ocean basins, reflecting changing environmental conditions.

Overview

This study examines global tropical cyclone spatial and temporal patterns across 1950-2024 using the International Best Track Archive for Climate Stewardship. The research integrates landfall and non-landfall event data to identify long-term trends and associations with El Niño Southern Oscillation phases. Geostatistical analysis techniques delineate persistent, diminishing, and intensifying cyclone clusters worldwide.

Methods and approach

The analysis employed Emerging Hot Spots Analysis and Optimized Hot Spots Analysis to detect spatial clustering patterns in tropical cyclone tracks. Researchers examined both annual and decadal timescale variability across six ocean basins. Statistical testing assessed cyclone frequency differences between ENSO phases at specified confidence thresholds.

Results

The Western Pacific basin exhibited the highest concentration of tropical cyclones throughout the 75-year period, followed by the Northern Indian Ocean and Southern Indian Ocean basins. Spatial clustering patterns shifted substantially over time, with Emerging Hot Spots Analysis revealing intensified activity in the Western Pacific and sporadic activity in the Eastern Pacific. Considerable heterogeneity characterized uncertainty in tropical cyclone track locations across different basins.

ENSO phase associations demonstrated regional specificity in cyclone activity. La Niña years produced significantly elevated landfall frequency in the North Atlantic and Southern Indian Ocean at 95% confidence level. El Niño years generated increased activity in the North Indian and Eastern Pacific basins at 99% confidence level, indicating strong phase-dependent modulation of regional cyclone patterns.

Implications

The identification of region-specific tropical cyclone patterns necessitates differentiated adaptation and risk management strategies across basins rather than globally uniform approaches. Temporal clustering of cyclones within ENSO phase cycles enables improved medium-range predictability for regional hazard assessment. Marked shifts in spatial clustering over decades indicate evolving environmental drivers including sea surface temperature and atmospheric circulation changes that warrant continued monitoring.

The documented spatial heterogeneity and ENSO associations provide quantitative foundations for basin-targeted disaster preparedness planning. Understanding basin-specific vulnerability patterns during distinct ENSO phases allows resource allocation optimization and targeted infrastructure hardening. The complex interplay between long-term trends and oscillatory climate patterns underscores the necessity of integrating paleoclimate and modern observations into risk frameworks addressing warming climate contexts.

Scope and limitations

This summary is based on the study abstract and available metadata. It does not include a full analysis of the complete paper, supplementary materials, or underlying datasets unless explicitly stated. Findings should be interpreted in the context of the original publication.