{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:05:06.989725", "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-May-25_to_2025-May-27_10.0_28.5"}, "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": 2025050000616}, "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 25 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 27 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 3}, "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": 62932.914852647235}, "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": ["Algeria", "Libya"]}, "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": 28.5}, "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": 10.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "10.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 9.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 12.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 26.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 28.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[8.75, 28.5], [8.97, 29.03], [9.5, 29.25], [9.75, 29.15], [10.0, 29.25], [10.25, 29.15], [10.5, 29.25], [10.75, 29.15], [11.0, 29.25], [11.25, 29.15], [11.5, 29.25], [11.75, 29.15], [12.0, 29.25], [12.53, 29.03], [12.75, 28.5], [12.65, 28.25], [12.75, 28.0], [12.53, 27.47], [12.18, 27.32], [12.15, 27.25], [12.25, 27.0], [12.03, 26.47], [11.5, 26.25], [11.25, 26.35], [11.18, 26.32], [11.03, 25.97], [10.5, 25.75], [10.25, 25.85], [10.0, 25.75], [9.47, 25.97], [9.25, 26.5], [9.35, 26.75], [9.32, 26.82], [8.97, 26.97], [8.75, 27.5], [8.85, 27.75], [8.75, 28.0], [8.85, 28.25], [8.75, 28.5]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Sahara"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-05-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[8.75, 28.0], [8.85, 28.25], [8.75, 28.5], [8.97, 29.03], [9.5, 29.25], [9.75, 29.15], [10.0, 29.25], [10.25, 29.15], [10.5, 29.25], [10.75, 29.15], [11.0, 29.25], [11.25, 29.15], [11.5, 29.25], [11.75, 29.15], [12.0, 29.25], [12.53, 29.03], [12.75, 28.5], [12.65, 28.25], [12.75, 28.0], [12.53, 27.47], [12.18, 27.32], [12.15, 27.25], [12.25, 27.0], [12.03, 26.47], [11.5, 26.25], [11.25, 26.35], [11.18, 26.32], [11.03, 25.97], [10.5, 25.75], [10.25, 25.85], [10.0, 25.75], [9.47, 25.97], [9.25, 26.5], [9.35, 26.75], [9.32, 26.82], [8.97, 26.97], [8.75, 27.5], [8.85, 27.75], [8.75, 28.0]]]]}, "2025-05-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[8.75, 28.0], [8.85, 28.25], [8.75, 28.5], [8.97, 29.03], [9.5, 29.25], [9.75, 29.15], [10.0, 29.25], [10.25, 29.15], [10.5, 29.25], [10.75, 29.15], [11.0, 29.25], [11.25, 29.15], [11.5, 29.25], [11.75, 29.15], [12.0, 29.25], [12.53, 29.03], [12.75, 28.5], [12.65, 28.25], [12.75, 28.0], [12.53, 27.47], [12.18, 27.32], [12.15, 27.25], [12.25, 27.0], [12.03, 26.47], [11.5, 26.25], [11.25, 26.35], [11.18, 26.32], [11.03, 25.97], [10.5, 25.75], [10.25, 25.85], [10.0, 25.75], [9.47, 25.97], [9.25, 26.5], [9.35, 26.75], [9.32, 26.82], [8.97, 26.97], [8.75, 27.5], [8.85, 27.75], [8.75, 28.0]]]]}, "2025-05-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[8.75, 28.0], [8.85, 28.25], [8.75, 28.5], [8.97, 29.03], [9.5, 29.25], [9.75, 29.15], [10.0, 29.25], [10.25, 29.15], [10.5, 29.25], [10.75, 29.15], [11.0, 29.25], [11.25, 29.15], [11.5, 29.25], [11.75, 29.15], [12.0, 29.25], [12.53, 29.03], [12.75, 28.5], [12.65, 28.25], [12.75, 28.0], [12.53, 27.47], [12.18, 27.32], [12.15, 27.25], [12.25, 27.0], [12.03, 26.47], [11.5, 26.25], [11.25, 26.35], [11.18, 26.32], [11.03, 25.97], [10.5, 25.75], [10.25, 25.85], [10.0, 25.75], [9.47, 25.97], [9.25, 26.5], [9.35, 26.75], [9.32, 26.82], [8.97, 26.97], [8.75, 27.5], [8.85, 27.75], [8.75, 28.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -7.190281172158052}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.255749845858732}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [24.21927369712057, 23.70162314815792, 25.731357718205118]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [21.578984832763695, 21.873965199788415, 23.915584818522177]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.421656207880015, -6.074305101304032, -4.271288228392151]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-7.190281172158052, -6.400240238321032, -4.977437066893913]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.7189565401930338, -1.9899492728134782, -1.4543134910384452]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.2394555463240593, -2.0715613993655784, -1.6643647192686664]}}