{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:07:43.413378", "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-Sep-30_to_2025-Oct-03_345.5_19.5"}, "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": 2025090000771}, "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": "September 30 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "October 03 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": 134399.07413422078}, "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": ["Mauritania"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["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": 19.5}, "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": 345.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "345.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 344.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 348.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 17.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 21.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-16.25, 20.5], [-16.03, 21.03], [-15.68, 21.18], [-15.53, 21.53], [-15.0, 21.75], [-14.75, 21.65], [-14.5, 21.75], [-14.25, 21.65], [-14.0, 21.75], [-13.47, 21.53], [-13.32, 21.18], [-13.25, 21.15], [-13.0, 21.25], [-12.47, 21.03], [-12.25, 20.5], [-12.47, 19.97], [-12.82, 19.82], [-12.85, 19.75], [-12.82, 19.68], [-12.47, 19.53], [-12.32, 19.18], [-12.25, 19.15], [-12.0, 19.25], [-11.47, 19.03], [-11.25, 18.5], [-11.47, 17.97], [-11.82, 17.82], [-11.97, 17.47], [-12.32, 17.32], [-12.47, 16.97], [-13.0, 16.75], [-13.25, 16.85], [-13.5, 16.75], [-14.0, 16.96], [-14.32, 16.82], [-14.47, 16.47], [-15.0, 16.25], [-15.25, 16.35], [-15.5, 16.25], [-16.03, 16.47], [-16.25, 17.0], [-16.15, 17.25], [-16.25, 17.5], [-16.04, 18.0], [-16.25, 18.5], [-16.15, 18.75], [-16.25, 19.0], [-16.15, 19.25], [-16.25, 19.5], [-16.15, 19.75], [-16.25, 20.0], [-16.15, 20.25], [-16.25, 20.5]]]]}}, "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": {"2025-09-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.25, 17.5], [-16.04000000000002, 18.0], [-16.25, 18.5], [-16.149999999999977, 18.75], [-16.25, 19.0], [-16.149999999999977, 19.25], [-16.25, 19.5], [-16.149999999999977, 19.75], [-16.25, 20.0], [-16.149999999999977, 20.25], [-16.25, 20.5], [-16.029999999999973, 21.03], [-15.680000000000007, 21.18], [-15.529999999999973, 21.53], [-15.0, 21.75], [-14.75, 21.65], [-14.5, 21.75], [-14.25, 21.65], [-14.0, 21.75], [-13.470000000000027, 21.53], [-13.319999999999993, 21.18], [-13.25, 21.15], [-13.0, 21.25], [-12.470000000000027, 21.03], [-12.25, 20.5], [-12.470000000000027, 19.97], [-12.819999999999993, 19.82], [-12.850000000000023, 19.75], [-12.819999999999993, 19.68], [-12.470000000000027, 19.53], [-12.319999999999993, 19.18], [-12.25, 19.15], [-12.0, 19.25], [-11.470000000000027, 19.03], [-11.25, 18.5], [-11.470000000000027, 17.97], [-11.819999999999993, 17.82], [-11.970000000000027, 17.47], [-12.319999999999993, 17.32], [-12.470000000000027, 16.97], [-13.0, 16.75], [-13.25, 16.85], [-13.5, 16.75], [-14.0, 16.96], [-14.319999999999993, 16.82], [-14.470000000000027, 16.47], [-15.0, 16.25], [-15.25, 16.35], [-15.5, 16.25], [-16.029999999999973, 16.47], [-16.25, 17.0], [-16.149999999999977, 17.25], [-16.25, 17.5]]]]}, "2025-10-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.25, 17.5], [-16.04000000000002, 18.0], [-16.25, 18.5], [-16.149999999999977, 18.75], [-16.25, 19.0], [-16.149999999999977, 19.25], [-16.25, 19.5], [-16.149999999999977, 19.75], [-16.25, 20.0], [-16.149999999999977, 20.25], [-16.25, 20.5], [-16.029999999999973, 21.03], [-15.680000000000007, 21.18], [-15.529999999999973, 21.53], [-15.0, 21.75], [-14.75, 21.65], [-14.5, 21.75], [-14.25, 21.65], [-14.0, 21.75], [-13.470000000000027, 21.53], [-13.319999999999993, 21.18], [-13.25, 21.15], [-13.0, 21.25], [-12.470000000000027, 21.03], [-12.25, 20.5], [-12.470000000000027, 19.97], 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{"type": "MultiPolygon", "coordinates": [[[[-16.029999999999973, 19.47], [-16.25, 20.0], [-16.029999999999973, 20.53], [-15.680000000000007, 20.68], [-15.529999999999973, 21.03], [-15.0, 21.25], [-14.470000000000027, 21.03], [-14.319999999999993, 20.68], [-13.970000000000027, 20.53], [-13.819999999999993, 20.18], [-13.470000000000027, 20.03], [-13.319999999999993, 19.68], [-12.970000000000027, 19.53], [-12.819999999999993, 19.18], [-12.470000000000027, 19.03], [-12.25, 18.5], [-12.470000000000027, 17.97], [-13.0, 17.75], [-13.5, 17.96], [-13.819999999999993, 17.82], [-13.970000000000027, 17.47], [-14.319999999999993, 17.32], [-14.470000000000027, 16.97], [-15.0, 16.75], [-15.529999999999973, 16.97], [-15.75, 17.5], [-15.649999999999977, 17.75], [-15.75, 18.0], [-15.649999999999977, 18.25], [-15.75, 18.5], [-15.649999999999977, 18.75], [-15.75, 19.0], [-15.649999999999977, 19.25], [-15.680000000000007, 19.32], [-16.029999999999973, 19.47]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -6.861764151356056}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.374706816297105}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [27.70794504138007, 27.407086612867317, 29.18141105762436, 29.71095894707571]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [26.84007288614913, 25.118377939860068, 27.054104105631552, 28.352831776936853]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.9157162011547655, -5.237377869520203, -3.4806212493457833, -3.0724088122996895]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.861764151356056, -6.646362388319744, -4.630796354009192, -3.7092241770201326]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-2.326532455985138, -2.509858758608128, -1.7423389664705595, -1.6072445628592806]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-3.11904423009382, -3.077240271792796, -2.256705400752648, -1.9488112918014666]}}