{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-03-19 18:23:00.947448", "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": "2021-Mar-24_to_2021-Mar-28_27.5_-29.5"}, "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": 2021030001071}, "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": "March 24 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "March 28 2021"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 5}, "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": 51245.33800616088}, "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": ["Lesotho", "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": -29.5}, "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": 27.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "27.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 25.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 29.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -30.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -28.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "Polygon", "coordinates": [[[28.146, -29.75], [28.25, -30.0], [28.146, -30.25], [28.25, -30.5], [28.03, -31.03], [27.5, -31.25], [27.25, -31.146], [27.0, -31.25], [26.47, -31.03], [26.25, -30.5], [26.354, -30.25], [26.323, -30.177], [25.97, -30.03], [25.823, -29.677], [25.75, -29.646], [25.5, -29.75], [24.97, -29.53], [24.75, -29.0], [24.97, -28.47], [25.5, -28.25], [25.75, -28.354], [25.823, -28.323], [25.97, -27.97], [26.5, -27.75], [26.75, -27.854], [27.0, -27.75], [27.25, -27.854], [27.323, -27.823], [27.47, -27.47], [28.0, -27.25], [28.53, -27.47], [28.75, -28.0], [28.625, -28.302], [29.03, -28.47], [29.177, -28.823], [29.53, -28.97], [29.75, -29.5], [29.53, -30.03], [29.0, -30.25], [28.47, -30.03], [28.323, -29.677], [28.25, -29.646], [28.177, -29.677], [28.146, -29.75]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.Southern-Africa", "E.Southern-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-03-24T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[25.75, -29.646446609406727], [25.5, -29.75], [24.96966991411009, -29.53033008588991], [24.75, -29.0], [24.96966991411009, -28.46966991411009], [25.5, -28.25], [25.75, -28.353553390593273], [25.82322330470336, -28.32322330470336], [25.96966991411009, -27.96966991411009], [26.5, -27.75], [26.75, -27.853553390593273], [27.0, -27.75], [27.25, -27.853553390593273], [27.32322330470336, -27.82322330470336], [27.46966991411009, -27.46966991411009], [28.0, -27.25], [28.53033008588991, -27.46966991411009], [28.75, -28.0], [28.625, -28.30177669529664], [29.03033008588991, -28.46966991411009], [29.25, -29.0], [29.03033008588991, -29.53033008588991], [28.5, -29.75], [28.25, -29.646446609406727], [28.17677669529664, -29.67677669529664], [28.146446609406727, -29.75], [28.25, -30.0], [28.146446609406727, -30.25], [28.25, -30.5], [28.03033008588991, -31.03033008588991], [27.5, -31.25], [27.25, -31.146446609406727], [27.0, -31.25], [26.46966991411009, -31.03033008588991], [26.25, -30.5], [26.353553390593273, -30.25], [26.32322330470336, -30.17677669529664], [25.96966991411009, -30.03033008588991], [25.82322330470336, -29.67677669529664], [25.75, -29.646446609406727]]]}, "2021-03-25T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[25.75, -29.646446609406727], [25.5, -29.75], [24.96966991411009, -29.53033008588991], [24.75, -29.0], [24.96966991411009, -28.46966991411009], [25.5, -28.25], [25.75, -28.353553390593273], [25.82322330470336, -28.32322330470336], [25.96966991411009, -27.96966991411009], [26.5, -27.75], [26.75, -27.853553390593273], [27.0, -27.75], [27.25, -27.853553390593273], [27.32322330470336, -27.82322330470336], [27.46966991411009, -27.46966991411009], [28.0, -27.25], [28.53033008588991, -27.46966991411009], [28.75, -28.0], [28.625, -28.30177669529664], [29.03033008588991, -28.46966991411009], [29.17677669529664, -28.82322330470336], [29.53033008588991, -28.96966991411009], [29.75, -29.5], [29.53033008588991, -30.03033008588991], [29.0, -30.25], [28.46966991411009, -30.03033008588991], [28.32322330470336, -29.67677669529664], [28.25, -29.646446609406727], [28.17677669529664, -29.67677669529664], [28.146446609406727, -29.75], [28.25, -30.0], [28.146446609406727, -30.25], [28.25, -30.5], [28.03033008588991, -31.03033008588991], [27.5, -31.25], [27.25, -31.146446609406727], [27.0, -31.25], [26.46966991411009, -31.03033008588991], [26.25, -30.5], [26.353553390593273, -30.25], [26.32322330470336, -30.17677669529664], [25.96966991411009, -30.03033008588991], [25.82322330470336, -29.67677669529664], [25.75, -29.646446609406727]]]}, "2021-03-26T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[25.75, -29.646446609406727], [25.5, -29.75], [24.96966991411009, -29.53033008588991], [24.75, -29.0], [24.96966991411009, -28.46966991411009], [25.5, -28.25], [25.75, -28.353553390593273], [25.82322330470336, -28.32322330470336], [25.96966991411009, -27.96966991411009], [26.5, -27.75], [26.75, -27.853553390593273], [27.0, -27.75], [27.25, -27.853553390593273], [27.32322330470336, -27.82322330470336], [27.46966991411009, -27.46966991411009], [28.0, -27.25], [28.53033008588991, -27.46966991411009], [28.75, -28.0], [28.625, -28.30177669529664], [29.03033008588991, -28.46966991411009], [29.17677669529664, -28.82322330470336], [29.53033008588991, -28.96966991411009], [29.75, -29.5], [29.53033008588991, -30.03033008588991], [29.0, -30.25], [28.46966991411009, -30.03033008588991], [28.32322330470336, -29.67677669529664], [28.25, -29.646446609406727], [28.17677669529664, -29.67677669529664], [28.146446609406727, -29.75], [28.25, -30.0], [28.146446609406727, -30.25], [28.25, -30.5], [28.03033008588991, -31.03033008588991], [27.5, -31.25], [27.25, -31.146446609406727], [27.0, -31.25], [26.46966991411009, -31.03033008588991], [26.25, -30.5], [26.353553390593273, -30.25], [26.32322330470336, -30.17677669529664], [25.96966991411009, -30.03033008588991], [25.82322330470336, -29.67677669529664], [25.75, -29.646446609406727]]]}, "2021-03-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[26.75, -30.0], [26.853553390593273, -29.75], [26.75, -29.5], [26.96966991411009, -28.96966991411009], [27.5, -28.75], [28.03033008588991, -28.96966991411009], [28.25, -29.5], [28.146446609406727, -29.75], [28.25, -30.0], [28.146446609406727, -30.25], [28.25, -30.5], [28.03033008588991, -31.03033008588991], [27.5, -31.25], [26.96966991411009, -31.03033008588991], [26.75, -30.5], [26.853553390593273, -30.25], [26.75, -30.0]]], [[[28.46966991411009, -28.96966991411009], [29.0, -28.75], [29.53033008588991, -28.96966991411009], [29.75, -29.5], [29.53033008588991, -30.03033008588991], [29.0, -30.25], [28.46966991411009, -30.03033008588991], [28.25, -29.5], [28.46966991411009, -28.96966991411009]]]]}, "2021-03-28T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[26.75, -29.5], [26.96966991411009, -28.96966991411009], [27.5, -28.75], [28.03033008588991, -28.96966991411009], [28.25, -29.5], [28.03033008588991, -30.03033008588991], [27.5, -30.25], [26.96966991411009, -30.03033008588991], [26.75, -29.5]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.074339990361409}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.978236619515456}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [14.483718041238433, 13.695018367085538, 14.370174378510114, 12.526809760287165, 14.079092462258586]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [9.88167716525902, 9.18588296724755, 9.773714027736446, 9.65160350356291, 14.079092462258586]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.0682792172767046, -3.4268683419625208, -2.6423918231462835, -2.2637107376310297, -2.072621791870745]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.8828048811946587, -4.074339990361409, -3.241989424896019, -2.433113160845096, -2.072621791870745]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.520566891151618, -1.7106662305900522, -1.3596750215396594, -1.3260605952571984, -1.189405670926676]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.8560137870800588, -1.8887885160656823, -1.5532598702435891, -1.4792536885393242, -1.189405670926676]}}