{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:04:28.847983", "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-Apr-24_to_2025-Apr-27_21.0_-24.0"}, "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": 2025040000595}, "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": "April 24 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 27 2025"}, "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": 64867.76430010886}, "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": ["Botswana", "South Africa"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Africa", "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": []}, "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": -24.0}, "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": 21.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "21.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 20.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 24.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -25.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -23.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[20.75, -22.85], [21.0, -22.75], [21.25, -22.85], [21.5, -22.75], [21.75, -22.85], [22.0, -22.75], [22.5, -22.96], [22.82, -22.82], [22.97, -22.47], [23.5, -22.25], [24.03, -22.47], [24.25, -23.0], [24.13, -23.3], [24.53, -23.47], [24.75, -24.0], [24.53, -24.53], [24.18, -24.68], [24.15, -24.75], [24.25, -25.0], [24.03, -25.53], [23.68, -25.68], [23.53, -26.03], [23.0, -26.25], [22.47, -26.03], [22.32, -25.68], [21.97, -25.53], [21.8, -25.12], [21.5, -25.25], [21.25, -25.15], [21.0, -25.25], [20.47, -25.03], [20.32, -24.68], [19.97, -24.53], [19.75, -24.0], [19.85, -23.75], [19.75, -23.5], [19.97, -22.97], [20.5, -22.75], [20.75, -22.85]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.Southern-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-04-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[19.75, -23.5], [19.97, -22.97], [20.5, -22.75], [20.75, -22.85], [21.0, -22.75], [21.25, -22.85], [21.5, -22.75], [21.75, -22.85], [22.0, -22.75], [22.5, -22.96], [22.82, -22.82], [22.97, -22.47], [23.5, -22.25], [24.03, -22.47], [24.25, -23.0], [24.13, -23.3], [24.53, -23.47], [24.75, -24.0], [24.53, -24.53], [24.18, -24.68], [24.15, -24.75], [24.25, -25.0], [24.03, -25.53], [23.68, -25.68], [23.53, -26.03], [23.0, -26.25], [22.47, -26.03], [22.32, -25.68], [21.97, -25.53], [21.8, -25.12], [21.5, -25.25], [21.25, -25.15], [21.0, -25.25], [20.47, -25.03], [20.32, -24.68], [19.97, -24.53], [19.75, -24.0], [19.85, -23.75], [19.75, -23.5]]]]}, "2025-04-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[19.75, -23.5], [19.97, -22.97], [20.5, -22.75], [20.75, -22.85], [21.0, -22.75], [21.25, -22.85], [21.5, -22.75], [21.75, -22.85], [22.0, -22.75], [22.5, -22.96], [22.82, -22.82], [22.97, -22.47], [23.5, -22.25], [24.03, -22.47], [24.25, -23.0], [24.13, -23.3], [24.53, -23.47], [24.75, -24.0], [24.53, -24.53], [24.18, -24.68], [24.15, -24.75], [24.25, -25.0], [24.03, -25.53], [23.68, -25.68], [23.53, -26.03], [23.0, -26.25], [22.47, -26.03], [22.32, -25.68], [21.97, -25.53], [21.8, -25.12], [21.5, -25.25], [21.25, -25.15], [21.0, -25.25], [20.47, -25.03], [20.32, -24.68], [19.97, -24.53], [19.75, -24.0], [19.85, -23.75], [19.75, -23.5]]]]}, "2025-04-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[19.75, -23.5], [19.97, -22.97], [20.5, -22.75], [20.75, -22.85], [21.0, -22.75], [21.25, -22.85], [21.5, -22.75], [21.75, -22.85], [22.0, -22.75], [22.5, -22.96], [22.82, -22.82], [22.97, -22.47], [23.5, -22.25], [24.03, -22.47], [24.25, -23.0], [24.13, -23.3], [24.53, -23.47], [24.75, -24.0], [24.53, -24.53], [24.18, -24.68], [24.15, -24.75], [24.25, -25.0], [24.03, -25.53], [23.68, -25.68], [23.53, -26.03], [23.0, -26.25], [22.47, -26.03], [22.32, -25.68], [21.97, -25.53], [21.8, -25.12], [21.5, -25.25], [21.25, -25.15], [21.0, -25.25], [20.47, -25.03], [20.32, -24.68], [19.97, -24.53], [19.75, -24.0], [19.85, -23.75], [19.75, -23.5]]]]}, "2025-04-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[19.75, -23.5], [19.97, -22.97], [20.5, -22.75], [21.03, -22.97], [21.18, -23.32], [21.53, -23.47], [21.75, -24.0], [21.53, -24.53], [21.0, -24.75], [20.75, -24.65], [20.5, -24.75], [19.97, -24.53], [19.75, -24.0], [19.85, -23.75], [19.75, -23.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -5.741491215509427}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.405440300345528}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [15.834826626985034, 15.874523859438739, 16.1524886863819, 17.046831173366968]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [14.792381540934286, 15.091310119628929, 15.18324686686202, 16.907318369547568]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.681923717650843, -4.524235807453769, -4.124160083818617, -3.531450206547902]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.741491215509427, -5.104099811567039, -5.116868408469884, -3.6804568545523466]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.707115876320907, -1.6594210080729193, -1.5200115292559782, -1.3506569114734173]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.1011714911904087, -1.870517189492133, -1.973958020701655, -1.451666908874745]}}