{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:07:02.210120", "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-Aug-24_to_2025-Aug-27_14.5_13.5"}, "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": 2025080000816}, "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": "August 24 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 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": 78223.01266304408}, "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": ["Cameroon", "Chad", "Nigeria"]}, "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": []}, "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": 13.5}, "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": 14.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "14.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 13.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 17.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 12.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 14.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[13.75, 14.15], [13.82, 14.18], [13.85, 14.25], [13.75, 14.5], [13.97, 15.03], [14.5, 15.25], [14.75, 15.15], [15.0, 15.25], [15.25, 15.15], [15.5, 15.25], [16.03, 15.03], [16.25, 14.5], [16.13, 14.2], [16.25, 14.15], [16.5, 14.25], [16.75, 14.15], [17.0, 14.25], [17.53, 14.03], [17.75, 13.5], [17.53, 12.97], [17.18, 12.82], [17.03, 12.47], [16.68, 12.32], [16.53, 11.97], [16.0, 11.75], [15.75, 11.85], [15.68, 11.82], [15.53, 11.47], [15.0, 11.25], [14.75, 11.35], [14.5, 11.25], [13.97, 11.47], [13.75, 12.0], [13.85, 12.25], [13.82, 12.32], [13.75, 12.35], [13.5, 12.25], [12.97, 12.47], [12.75, 13.0], [12.85, 13.25], [12.75, 13.5], [12.97, 14.03], [13.5, 14.25], [13.75, 14.15]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Sahara", "Western-Africa", "Central-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-08-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[12.75, 13.5], [12.97, 14.03], [13.5, 14.25], [13.75, 14.15], [13.82, 14.18], [13.97, 14.53], [14.5, 14.75], [14.75, 14.65], [15.0, 14.75], [15.53, 14.53], [15.68, 14.18], [15.75, 14.15], [16.0, 14.25], [16.25, 14.15], [16.5, 14.25], [16.75, 14.15], [17.0, 14.25], [17.53, 14.03], [17.75, 13.5], [17.53, 12.97], [17.18, 12.82], [17.03, 12.47], [16.68, 12.32], [16.53, 11.97], [16.0, 11.75], [15.75, 11.85], [15.68, 11.82], [15.53, 11.47], [15.0, 11.25], [14.75, 11.35], [14.5, 11.25], [13.97, 11.47], [13.75, 12.0], [13.85, 12.25], [13.82, 12.32], [13.75, 12.35], [13.5, 12.25], [12.97, 12.47], [12.75, 13.0], [12.85, 13.25], [12.75, 13.5]]]]}, "2025-08-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[12.75, 13.5], [12.97, 14.03], [13.5, 14.25], [13.75, 14.15], [13.82, 14.18], [13.85, 14.25], [13.75, 14.5], [13.97, 15.03], [14.5, 15.25], [14.75, 15.15], [15.0, 15.25], [15.25, 15.15], [15.5, 15.25], [16.03, 15.03], [16.25, 14.5], [16.13, 14.2], [16.25, 14.15], [16.5, 14.25], [16.75, 14.15], [17.0, 14.25], [17.53, 14.03], [17.75, 13.5], [17.53, 12.97], [17.18, 12.82], [17.03, 12.47], [16.68, 12.32], [16.53, 11.97], [16.0, 11.75], [15.75, 11.85], [15.68, 11.82], [15.53, 11.47], [15.0, 11.25], [14.75, 11.35], [14.5, 11.25], [13.97, 11.47], [13.75, 12.0], [13.85, 12.25], [13.82, 12.32], [13.75, 12.35], [13.5, 12.25], [12.97, 12.47], [12.75, 13.0], [12.85, 13.25], [12.75, 13.5]]]]}, "2025-08-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[12.75, 13.5], [12.97, 14.03], [13.5, 14.25], [13.75, 14.15], [13.82, 14.18], [13.85, 14.25], [13.75, 14.5], [13.97, 15.03], [14.5, 15.25], [14.75, 15.15], [15.0, 15.25], [15.25, 15.15], [15.5, 15.25], [16.03, 15.03], [16.25, 14.5], [16.13, 14.2], [16.25, 14.15], [16.5, 14.25], [16.75, 14.15], [17.0, 14.25], [17.53, 14.03], [17.75, 13.5], [17.53, 12.97], [17.18, 12.82], [17.03, 12.47], [16.68, 12.32], [16.53, 11.97], [16.0, 11.75], [15.75, 11.85], [15.68, 11.82], [15.53, 11.47], [15.0, 11.25], [14.75, 11.35], [14.5, 11.25], [13.97, 11.47], [13.75, 12.0], [13.85, 12.25], [13.82, 12.32], [13.75, 12.35], [13.5, 12.25], [12.97, 12.47], [12.75, 13.0], [12.85, 13.25], [12.75, 13.5]]]]}, "2025-08-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[15.25, 13.0], [15.03, 12.47], [14.5, 12.25], [13.97, 12.47], [13.75, 13.0], [13.97, 13.53], [14.5, 13.75], [15.03, 13.53], [15.25, 13.0]]], [[[13.75, 14.5], [13.97, 15.03], [14.5, 15.25], [14.75, 15.15], [15.0, 15.25], [15.25, 15.15], [15.5, 15.25], [16.03, 15.03], [16.25, 14.5], [16.03, 13.97], [15.5, 13.75], [15.25, 13.85], [15.0, 13.75], [14.75, 13.85], [14.5, 13.75], [13.97, 13.97], [13.75, 14.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -3.538392402872887}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.2246333571320123}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [25.58629541108104, 25.858542672181727, 25.653614494128135, 26.93085886637374]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [24.463625844319665, 24.837768809000693, 25.14581451416018, 26.55421091715499]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.183395409960667, -2.153994768294093, -2.3506476499840994, -2.091499990482319]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-2.591459172776581, -3.0531239784690456, -3.538392402872887, -2.485783183537535]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.516730893651802, -1.4787095208436847, -1.638813971409541, -1.3913942225102272]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.0020680328879057, -1.824933759733744, -2.183542961808224, -1.5724289457286273]}}