{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:53:15.735177", "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": "2023-May-22_to_2023-May-25_45.5_-23.5"}, "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": 2023050000678}, "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": "May 22 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 25 2023"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 4}, "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": 125892.56920217391}, "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": ["Madagascar"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Africa"]}, "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": ["Indian Ocean"]}, "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": -23.5}, "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": 45.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "45.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 44.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 48.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -27.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -22.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[43.46, -23.5], [43.25, -23.0], [43.35, -22.75], [43.25, -22.5], [43.47, -21.97], [44.0, -21.75], [44.25, -21.85], [44.5, -21.75], [45.03, -21.97], [45.18, -22.32], [45.25, -22.35], [45.5, -22.25], [46.03, -22.47], [46.2, -22.87], [46.5, -22.75], [47.03, -22.97], [47.25, -23.5], [47.04, -24.0], [47.18, -24.32], [47.53, -24.47], [47.68, -24.82], [47.75, -24.85], [48.0, -24.75], [48.25, -24.85], [48.5, -24.75], [49.03, -24.97], [49.25, -25.5], [49.03, -26.03], [48.68, -26.18], [48.65, -26.25], [48.75, -26.5], [48.53, -27.03], [48.0, -27.25], [47.75, -27.15], [47.68, -27.18], [47.53, -27.53], [47.0, -27.75], [46.75, -27.65], [46.5, -27.75], [46.25, -27.65], [46.0, -27.75], [45.75, -27.65], [45.5, -27.75], [45.25, -27.65], [45.0, -27.75], [44.75, -27.65], [44.5, -27.75], [43.97, -27.53], [43.75, -27.0], [43.85, -26.75], [43.75, -26.5], [43.97, -25.97], [44.5, -25.75], [44.25, -25.65], [44.0, -25.75], [43.47, -25.53], [43.25, -25.0], [43.35, -24.75], [43.25, -24.5], [43.35, -24.25], [43.25, -24.0], [43.46, -23.5]], [[44.75, -25.85], [45.0, -25.75], [44.75, -25.65], [44.5, -25.75], [44.75, -25.85]], [[45.25, -25.85], [45.5, -25.75], [45.25, -25.65], [45.0, -25.75], [45.25, -25.85]], [[45.75, -25.85], [45.82, -25.82], [45.93, -25.57], [45.5, -25.75], [45.75, -25.85]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Madagascar", "S.Indian-Ocean"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2023-05-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[44.75, -23.0], [44.97, -22.47], [45.5, -22.25], [46.03, -22.47], [46.25, -23.0], [46.15, -23.25], [46.25, -23.5], [46.03, -24.03], [45.5, -24.25], [44.97, -24.03], [44.75, -23.5], [44.85, -23.25], [44.75, -23.0]]]]}, "2023-05-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[43.25, -24.5], [43.35, -24.25], [43.25, -24.0], [43.46, -23.5], [43.25, -23.0], [43.35, -22.75], [43.25, -22.5], [43.47, -21.97], [44.0, -21.75], [44.25, -21.85], [44.5, -21.75], [45.03, 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{"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.27997252582827}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [18.321870012679028, 19.56122943328404, 19.33905717853628, 19.72059267022422]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [18.12535430385236, 13.2104518977755, 13.343012323781636, 13.404406242841503]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.075421026702088, -2.3175988273735446, -2.506114328000063, -2.0252955998501445]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-2.1714467976359515, -3.441857817476034, -3.9505610266752456, -3.13204043340329]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3506437105320328, -1.7529650130138041, -1.8639999776032217, -1.5296447844929326]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.3954236052861744, -2.2036524264349944, -2.5086263395099286, -1.8500514173503606]}}