{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:50:13.731081", "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-Jan-06_to_2023-Jan-09_34.5_-24.5"}, "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": 2023010000372}, "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": "January 06 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 09 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": 103861.0087158148}, "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": ["Eswatini", "Mozambique", "South Africa"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Africa", "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": ["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": -24.5}, "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": 34.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "34.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 31.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 34.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -28.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -23.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[30.47, -22.97], [31.0, -22.75], [31.25, -22.85], [31.5, -22.75], [31.75, -22.85], [32.0, -22.75], [32.25, -22.85], [32.5, -22.75], [32.75, -22.85], [33.0, -22.75], [33.25, -22.85], [33.5, -22.75], [33.75, -22.85], [34.0, -22.75], [34.53, -22.97], [34.68, -23.32], [35.03, -23.47], [35.25, -24.0], [35.15, -24.25], [35.25, -24.5], [35.03, -25.03], [34.5, -25.25], [34.25, -25.15], [34.18, -25.18], [34.03, -25.53], [33.68, -25.68], [33.53, -26.03], [33.18, -26.18], [33.15, -26.25], [33.25, -26.5], [33.15, -26.75], [33.25, -27.0], [33.04, -27.5], [33.25, -28.0], [33.03, -28.53], [32.5, -28.75], [31.97, -28.53], [31.82, -28.18], [31.47, -28.03], [31.25, -27.5], [31.47, -26.97], [31.82, -26.82], [31.85, -26.75], [31.82, -26.68], [31.47, -26.53], [31.25, -26.0], [31.35, -25.75], [31.32, -25.68], [30.97, -25.53], [30.82, -25.18], [30.47, -25.03], [30.25, -24.5], [30.35, -24.25], [30.25, -24.0], [30.35, -23.75], [30.25, -23.5], [30.47, -22.97]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Southern-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2023-01-06T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[30.25, -24.0], [30.35, -23.75], [30.25, -23.5], [30.47, -22.97], [31.0, -22.75], [31.25, -22.85], [31.5, -22.75], [31.75, -22.85], [32.0, -22.75], [32.25, -22.85], [32.5, -22.75], [32.75, -22.85], [33.0, -22.75], [33.25, -22.85], [33.5, -22.75], [33.75, -22.85], [34.0, -22.75], [34.53, -22.97], [34.68, -23.32], [35.03, -23.47], [35.25, -24.0], [35.15, -24.25], [35.25, -24.5], [35.03, -25.03], [34.5, -25.25], [34.25, -25.15], [34.18, -25.18], [34.03, -25.53], [33.68, -25.68], [33.53, -26.03], [33.18, -26.18], [33.15, -26.25], [33.25, -26.5], [33.15, -26.75], [33.25, -27.0], [33.04, -27.5], [33.25, -28.0], [33.03, -28.53], [32.5, -28.75], [31.97, -28.53], [31.82, -28.18], [31.47, -28.03], [31.25, -27.5], [31.47, -26.97], [31.82, -26.82], [31.85, -26.75], [31.82, -26.68], [31.47, -26.53], [31.25, -26.0], [31.35, -25.75], [31.32, -25.68], [30.97, -25.53], [30.82, -25.18], [30.47, -25.03], [30.25, -24.5], [30.35, -24.25], [30.25, -24.0]]]]}, "2023-01-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[30.25, -24.0], [30.35, -23.75], [30.25, -23.5], [30.47, -22.97], [31.0, -22.75], [31.25, -22.85], [31.5, -22.75], [31.75, -22.85], [32.0, -22.75], [32.25, -22.85], [32.5, -22.75], [32.75, -22.85], [33.0, -22.75], [33.25, -22.85], [33.5, -22.75], [33.75, -22.85], [34.0, -22.75], [34.53, -22.97], [34.68, -23.32], [35.03, -23.47], [35.25, -24.0], [35.15, -24.25], [35.25, -24.5], [35.03, -25.03], [34.5, -25.25], [34.25, -25.15], [34.18, -25.18], [34.03, -25.53], [33.68, -25.68], [33.53, -26.03], [33.18, -26.18], [33.15, -26.25], [33.25, -26.5], [33.15, -26.75], [33.25, -27.0], [33.04, -27.5], [33.25, -28.0], [33.03, -28.53], [32.5, -28.75], [31.97, -28.53], [31.82, -28.18], [31.47, -28.03], [31.25, -27.5], [31.47, -26.97], [31.82, -26.82], [31.85, -26.75], [31.82, -26.68], [31.47, -26.53], [31.25, -26.0], [31.35, -25.75], [31.32, -25.68], [30.97, -25.53], [30.82, -25.18], [30.47, -25.03], [30.25, -24.5], [30.35, -24.25], [30.25, -24.0]]]]}, "2023-01-08T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[30.25, -24.0], [30.35, -23.75], [30.25, -23.5], [30.47, -22.97], [31.0, -22.75], [31.25, -22.85], [31.5, -22.75], [31.75, -22.85], [32.0, -22.75], [32.25, -22.85], [32.5, -22.75], [32.75, -22.85], [33.0, -22.75], [33.25, -22.85], [33.5, -22.75], [33.75, -22.85], [34.0, -22.75], [34.53, -22.97], [34.68, -23.32], [35.03, -23.47], [35.25, -24.0], [35.15, -24.25], [35.25, -24.5], [35.03, -25.03], [34.5, -25.25], [34.25, -25.15], [34.18, -25.18], [34.03, -25.53], [33.68, -25.68], [33.53, -26.03], [33.18, -26.18], [33.15, -26.25], [33.25, -26.5], [33.15, -26.75], [33.25, -27.0], [33.04, -27.5], [33.25, -28.0], [33.03, -28.53], [32.5, -28.75], [31.97, -28.53], [31.82, -28.18], [31.47, -28.03], [31.25, -27.5], [31.47, -26.97], [31.82, -26.82], [31.85, -26.75], [31.82, -26.68], [31.47, -26.53], [31.25, -26.0], [31.35, -25.75], [31.32, -25.68], [30.97, -25.53], [30.82, -25.18], [30.47, -25.03], [30.25, -24.5], [30.35, -24.25], [30.25, -24.0]]]]}, "2023-01-09T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[33.97, -23.97], [34.5, -23.75], [35.03, -23.97], [35.25, -24.5], [35.03, -25.03], [34.5, -25.25], [33.97, -25.03], [33.75, -24.5], [33.97, -23.97]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -7.332481737895932}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.185667571418623}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [22.774607428469608, 21.481946152152716, 23.016941486422354, 24.506409733732028]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [19.621037153392706, 19.52166560558402, 20.6180578311899, 24.506409733732028]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.8798660418022157, -5.145173825430593, -3.58517995726727, -2.216634492382866]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.003192638602286, -7.332481737895932, -4.336838167755957, -2.216634492382866]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.874095060964369, -2.363357041831793, -1.6344956511908826, -1.336994978451453]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.6135484667987905, -2.9865082267085628, -1.958889783556591, -1.336994978451453]}}