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Using the International Best Track Archive for Climate Stewardship (IBTrACS; Knapp et al., 2010) and the North Atlantic HURDAT2 database (Landsea and Franklin, 2013), we developed the Tropical Cyclone Intensification Index (TCII) for the Atlantic basin.Although several previously proposed indices have shown good performance, it became necessary to introduce a new formulation that simultaneously incorporates two input variables: changes in maximum sustained wind speed and changes in central pressure over a given time interval. This formulation allows the index to represent, with comparable accuracy, both intensification and weakening processes, as well as rapid and gradual intensity changes.The TCII was calculated as: TCII(t) = (200/π) arctan [ V_std(t) − P_std(t) + 0.132031 ] (1) where V_std(t) = (ΔV − μ_V) / σ_V (2) P_std(t) = (ΔP − μ_P) / σ_P (3)During the initial stage of the research (article currently under review), calculations were performed using 6-hour intervals in order to maximize the number of available observations for statistical analysis. However, in the present dataset we also provide calculations using 24-hour intervals, since this time scale is the standard reference used in most meteorological studies.The parameters are defined as follows: · ΔP(t): 6-h pressure change (mb)· μP is the climatological mean of ΔP· σP is the climatological standard deviation of ΔP· ΔV(t): 6-h wind speed change (kt)· μV is the climatological mean of ΔV· σV is the climatological standard deviation of ΔV The remaining coefficients in the function are empirical and were calibrated to ensure proper scaling of the index. This adjustment guarantees that the neutral state, defined as the simultaneous absence of changes in maximum sustained wind speed and central pressure, corresponds closely to TCII = 0, while maintaining the theoretical bounded range of approximately −100 to +100.The resulting function is simple and continuous, which is particularly convenient for regression analyses. As a first validation approach, the results can be inspected by identifying the moments of strongest intensification and comparing them with documented regional reports. For instance, landfall events are typically detected as some of the strongest weakening episodes in the historical dataset. Dataset StructureThis dataset is organized into five folders:1. TC_Seasons_NHCContains a summary of all tropical cyclones in the Atlantic basin during the 2000–2024 period, organized by year and by system. Only the following systems were considered:· Tropical Depressions· Tropical Storms· Hurricanes· Subtropical Lows Other system types were not included.2. TCII_06hrs_2000–2024Contains TCII values for all systems listed above. Data are organized in annual CSV files, with the index calculated using 6-hour intervals.3. TCII_24hrs_2000–2024Contains TCII values for the same systems, also distributed in annual CSV files, but computed using 24-hour intervals.4. Top20_TC_Ranking_6hrsList of the 20 most intense intensification events (according to TCII calculated at 6-hour intervals) identified in the Atlantic basin during the study period.5. Top20_TC_Ranking_24hrsList of the 20 most intense intensification events (according to TCII calculated at 24-hour intervals) identified in the Atlantic basin during the study period.The last two folders include files in several formats compatible with different tools, including:· QGIS: shp, geojson, gpkg· Google Earth: kml· Spreadsheet and text editors: csv, xlsx Future UpdatesIn a future version of the dataset, we plan to provide the values of all statistical parameters used in the calculations, together with two Python scripts that will allow users to reproduce the computations and generate customized ranking analyses.