{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:07:36.325720", "data_source": "ERA5", "website": "http://wexa.jamstec.go.jp", "Author": "Patrick Martineau"}, "event_id": {"name": "Event ID", "description": "A unique identifier based on: beginning_date, end_date, longitude, and latitude", "value": "2025-Sep-11_to_2025-Sep-13_77.0_19.0"}, "event_label": {"name": "Event label", "description": "Integer-valued grid identifier that uniquely labels each detected extreme event in space and time, consistent with the corresponding labels stored in the NetCDF dataset.", "value": 2025090000335}, "status": {"name": "Status", "description": "An ongoing event denotes an event that lasts up to the latest data available. These events are subject to change as newer data is added.", "value": false}, "start_date": {"name": "Start date", "description": "First date on which grid points are under the influence of an event", "value": "September 11 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 13 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 3}, "figures_available": {"name": "Figures available", "description": "True if figures were pre-generated for this event", "value": true}, "detection_var": {"name": "Detection variable", "description": "Variable used for the detection scheme", "value": "t2m"}, "event_type": {"name": "Event type", "description": "Type of the event detected", "value": "Cold spell"}, "area": {"name": "Area", "description": "The area (in square meters) encompassing all grid points under the influence of an event during its lifetime.", "value": 109218.26337815265}, "countries_affected": {"name": "Countries affected", "description": "The ArcGIS geocoding API (https://developers.arcgis.com/rest/geocode/) is used to obtain a list of all the countries affected by an event during its lifetime.", "value": ["India"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Asia"]}, "oceans_affected": {"name": "Ocean basins affected", "description": "The ArcGIS geocoding API (https://developers.arcgis.com/rest/geocode/) is used to obtain a list of all the ocean basins affected by an event during its lifetime.", "value": []}, "center_lat": {"name": "Center latitude", "description": "Latitude of the maximum time-integrated standardized t2m anomalies. Only t2m of the same polarity as the events are considered (positive T2m for a HW, for instance). The centre is thus representative of both the severity and persistence of anomalies.", "value": 19.0}, "center_lon": {"name": "Center longitude", "description": "Longitude of the maximum time-integrated standardized t2m anomalies. Only t2m of the same polarity as the events are considered (positive T2m for a HW, for instance). The centre is thus representative of both the severity and persistence of anomalies.", "value": 77.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "77.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 76.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 79.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 15.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 19.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[75.25, 17.0], [75.47, 17.53], [75.88, 17.7], [75.75, 18.0], [75.85, 18.25], [75.75, 18.5], [75.85, 18.75], [75.75, 19.0], [75.97, 19.53], [76.5, 19.75], [76.75, 19.65], [77.0, 19.75], [77.25, 19.65], [77.5, 19.75], [78.03, 19.53], [78.18, 19.18], [78.25, 19.15], [78.5, 19.25], [79.03, 19.03], [79.18, 18.68], [79.53, 18.53], [79.75, 18.0], [79.65, 17.75], [79.75, 17.5], [79.65, 17.25], [79.75, 17.0], [79.65, 16.75], [79.75, 16.5], [79.53, 15.97], [79.0, 15.75], [78.7, 15.87], [78.53, 15.47], [78.0, 15.25], [77.75, 15.35], [77.68, 15.32], [77.65, 15.25], [77.75, 15.0], [77.53, 14.47], [77.0, 14.25], [76.47, 14.47], [76.32, 14.82], [75.97, 14.97], [75.82, 15.32], [75.47, 15.47], [75.25, 16.0], [75.35, 16.25], [75.25, 16.5], [75.35, 16.75], [75.25, 17.0]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["S.Asia"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-09-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[75.25, 16.5], [75.35, 16.75], [75.25, 17.0], [75.47, 17.53], [75.88, 17.7], [75.75, 18.0], [75.85, 18.25], [75.75, 18.5], [75.85, 18.75], [75.75, 19.0], [75.97, 19.53], [76.5, 19.75], [76.75, 19.65], [77.0, 19.75], [77.25, 19.65], [77.5, 19.75], [78.03, 19.53], [78.18, 19.18], [78.25, 19.15], [78.5, 19.25], [79.03, 19.03], [79.18, 18.68], [79.53, 18.53], [79.75, 18.0], [79.65, 17.75], [79.75, 17.5], [79.65, 17.25], [79.75, 17.0], [79.65, 16.75], [79.75, 16.5], [79.53, 15.97], [79.0, 15.75], [78.7, 15.87], [78.53, 15.47], [78.0, 15.25], [77.75, 15.35], [77.68, 15.32], [77.65, 15.25], [77.75, 15.0], [77.53, 14.47], [77.0, 14.25], [76.47, 14.47], [76.32, 14.82], [75.97, 14.97], [75.82, 15.32], [75.47, 15.47], [75.25, 16.0], [75.35, 16.25], [75.25, 16.5]]]]}, "2025-09-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[75.25, 16.5], [75.35, 16.75], [75.25, 17.0], [75.47, 17.53], [75.88, 17.7], [75.75, 18.0], [75.85, 18.25], [75.75, 18.5], [75.85, 18.75], [75.75, 19.0], [75.97, 19.53], [76.5, 19.75], [76.75, 19.65], [77.0, 19.75], [77.25, 19.65], [77.5, 19.75], [78.03, 19.53], [78.18, 19.18], [78.25, 19.15], [78.5, 19.25], [79.03, 19.03], [79.18, 18.68], [79.53, 18.53], [79.75, 18.0], [79.65, 17.75], [79.75, 17.5], [79.65, 17.25], [79.75, 17.0], [79.65, 16.75], [79.75, 16.5], [79.53, 15.97], [79.0, 15.75], [78.7, 15.87], [78.53, 15.47], [78.0, 15.25], [77.75, 15.35], [77.68, 15.32], [77.65, 15.25], [77.75, 15.0], [77.53, 14.47], [77.0, 14.25], [76.47, 14.47], [76.32, 14.82], [75.97, 14.97], [75.82, 15.32], [75.47, 15.47], [75.25, 16.0], [75.35, 16.25], [75.25, 16.5]]]]}, "2025-09-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[75.25, 16.5], [75.35, 16.75], [75.25, 17.0], [75.47, 17.53], [75.88, 17.7], [75.75, 18.0], [75.85, 18.25], [75.75, 18.5], [75.85, 18.75], [75.75, 19.0], [75.97, 19.53], [76.5, 19.75], [76.75, 19.65], [77.0, 19.75], [77.25, 19.65], [77.5, 19.75], [78.03, 19.53], [78.18, 19.18], [78.25, 19.15], [78.5, 19.25], [79.03, 19.03], [79.18, 18.68], [79.53, 18.53], [79.75, 18.0], [79.65, 17.75], [79.75, 17.5], [79.65, 17.25], [79.75, 17.0], [79.65, 16.75], [79.75, 16.5], [79.53, 15.97], [79.0, 15.75], [78.7, 15.87], [78.53, 15.47], [78.0, 15.25], [77.75, 15.35], [77.68, 15.32], [77.65, 15.25], [77.75, 15.0], [77.53, 14.47], [77.0, 14.25], [76.47, 14.47], [76.32, 14.82], [75.97, 14.97], [75.82, 15.32], [75.47, 15.47], [75.25, 16.0], [75.35, 16.25], [75.25, 16.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -3.0198235959884983}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -1.871076333883421}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [24.486073928695532, 24.758287941872595, 24.84252188742704]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [23.12077356974288, 23.277759806315146, 23.867773946126306]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.053696246853398, -1.8223354527484679, -1.7371973020483975]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.0198235959884983, -2.674924424180631, -2.4245546390039294]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.81919834420096, -1.6627149937112575, -1.5772797930125981]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.2162518451154365, -2.8967366977967774, -2.340322191968427]}}