{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:02:27.746916", "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": "2024-Dec-19_to_2024-Dec-25_344.0_14.5"}, "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": 2024120000496}, "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": "December 19 2024"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 25 2024"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 7}, "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": 104827.80240864401}, "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": ["Gambia", "Guinea-Bissau", "Mali", "Senegal"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Africa", "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": 14.5}, "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": 344.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "344.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 344.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 349.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 12.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 15.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-14.0, 15.75], [-13.75, 15.65], [-13.5, 15.75], [-13.25, 15.65], [-13.0, 15.75], [-12.75, 15.65], [-12.5, 15.75], [-11.97, 15.53], [-11.82, 15.18], [-11.75, 15.15], [-11.5, 15.25], [-11.25, 15.15], [-11.0, 15.25], [-10.47, 15.03], [-10.25, 14.5], [-10.47, 13.97], [-11.0, 13.75], [-11.25, 13.85], [-11.5, 13.75], [-11.75, 13.85], [-11.82, 13.82], [-11.97, 13.47], [-12.5, 13.25], [-12.75, 13.35], [-12.82, 13.32], [-12.97, 12.97], [-13.5, 12.75], [-13.75, 12.85], [-14.0, 12.75], [-14.25, 12.85], [-14.32, 12.82], [-14.35, 12.75], [-14.25, 12.5], [-14.47, 11.97], [-15.0, 11.75], [-15.53, 11.97], [-15.68, 12.32], [-16.03, 12.47], [-16.25, 13.0], [-16.12, 13.3], [-16.53, 13.47], [-16.75, 14.0], [-16.65, 14.25], [-16.75, 14.5], [-16.65, 14.75], [-16.75, 15.0], [-16.53, 15.53], [-16.18, 15.68], [-16.03, 16.03], [-15.5, 16.25], [-15.25, 16.15], [-15.0, 16.25], [-14.47, 16.03], [-14.32, 15.68], [-14.25, 15.65], [-14.0, 15.75]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Sahara", "Western-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2024-12-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.0, 14.25], [-16.529999999999973, 14.47], [-16.75, 15.0], [-16.529999999999973, 15.53], [-16.0, 15.75], [-15.75, 15.65], [-15.5, 15.75], [-14.970000000000027, 15.53], [-14.75, 15.0], [-14.970000000000027, 14.47], [-15.5, 14.25], [-15.75, 14.35], [-16.0, 14.25]]]]}, "2024-12-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.75, 15.0], [-16.529999999999973, 15.53], [-16.180000000000007, 15.68], [-16.029999999999973, 16.03], [-15.5, 16.25], [-15.25, 16.15], [-15.0, 16.25], [-14.470000000000027, 16.03], [-14.319999999999993, 15.68], [-14.25, 15.65], [-14.0, 15.75], [-13.75, 15.65], [-13.5, 15.75], [-13.25, 15.65], [-13.0, 15.75], [-12.75, 15.65], [-12.5, 15.75], [-11.970000000000027, 15.53], [-11.75, 15.0], [-11.95999999999998, 14.5], [-11.75, 14.0], [-11.970000000000027, 13.47], [-12.5, 13.25], [-12.75, 13.35], [-13.0, 13.25], [-13.25, 13.35], [-13.5, 13.25], [-13.75, 13.35], [-14.0, 13.25], [-14.529999999999973, 13.47], [-14.680000000000007, 13.82], [-14.75, 13.85], [-15.0, 13.75], [-15.5, 13.96], [-16.0, 13.75], [-16.529999999999973, 13.97], [-16.75, 14.5], [-16.649999999999977, 14.75], [-16.75, 15.0]]]]}, "2024-12-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.75, 15.0], [-16.529999999999973, 15.53], [-16.180000000000007, 15.68], [-16.029999999999973, 16.03], [-15.5, 16.25], [-15.25, 16.15], [-15.0, 16.25], [-14.470000000000027, 16.03], [-14.319999999999993, 15.68], [-14.25, 15.65], [-14.0, 15.75], [-13.75, 15.65], [-13.5, 15.75], [-13.25, 15.65], [-13.0, 15.75], [-12.75, 15.65], [-12.5, 15.75], [-11.970000000000027, 15.53], [-11.819999999999993, 15.18], [-11.75, 15.15], [-11.5, 15.25], [-11.25, 15.15], [-11.0, 15.25], [-10.470000000000027, 15.03], [-10.25, 14.5], [-10.470000000000027, 13.97], [-11.0, 13.75], [-11.25, 13.85], [-11.5, 13.75], [-11.75, 13.85], [-11.819999999999993, 13.82], [-11.970000000000027, 13.47], [-12.5, 13.25], [-12.75, 13.35], [-13.0, 13.25], [-13.25, 13.35], [-13.5, 13.25], [-13.75, 13.35], [-13.819999999999993, 13.32], [-13.970000000000027, 12.97], [-14.5, 12.75], [-15.029999999999973, 12.97], [-15.25, 13.5], [-15.120000000000005, 13.8], [-15.5, 13.96], [-16.0, 13.75], [-16.529999999999973, 13.97], [-16.75, 14.5], [-16.649999999999977, 14.75], [-16.75, 15.0]]]]}, "2024-12-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.75, 14.5], [-16.649999999999977, 14.75], [-16.75, 15.0], [-16.529999999999973, 15.53], [-16.180000000000007, 15.68], [-16.029999999999973, 16.03], [-15.5, 16.25], [-15.25, 16.15], [-15.0, 16.25], [-14.470000000000027, 16.03], [-14.319999999999993, 15.68], [-14.25, 15.65], [-14.0, 15.75], [-13.75, 15.65], [-13.5, 15.75], [-13.25, 15.65], [-13.0, 15.75], [-12.75, 15.65], [-12.5, 15.75], [-11.970000000000027, 15.53], [-11.819999999999993, 15.18], [-11.75, 15.15], [-11.5, 15.25], [-11.25, 15.15], [-11.0, 15.25], [-10.470000000000027, 15.03], [-10.25, 14.5], [-10.470000000000027, 13.97], [-11.0, 13.75], [-11.25, 13.85], [-11.5, 13.75], [-11.75, 13.85], [-11.819999999999993, 13.82], [-11.970000000000027, 13.47], [-12.5, 13.25], [-12.75, 13.35], [-12.819999999999993, 13.32], [-12.970000000000027, 12.97], [-13.5, 12.75], [-13.75, 12.85], [-14.0, 12.75], [-14.25, 12.85], [-14.319999999999993, 12.82], [-14.350000000000023, 12.75], [-14.25, 12.5], [-14.470000000000027, 11.97], [-15.0, 11.75], [-15.529999999999973, 11.97], [-15.680000000000007, 12.32], [-16.029999999999973, 12.47], [-16.25, 13.0], [-16.120000000000005, 13.3], [-16.529999999999973, 13.47], [-16.75, 14.0], [-16.649999999999977, 14.25], [-16.75, 14.5]]]]}, "2024-12-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.75, 14.5], [-16.529999999999973, 15.03], [-16.0, 15.25], [-15.75, 15.15], [-15.680000000000007, 15.18], [-15.529999999999973, 15.53], [-15.0, 15.75], [-14.75, 15.65], [-14.5, 15.75], [-14.25, 15.65], [-14.0, 15.75], [-13.470000000000027, 15.53], [-13.25, 15.0], [-13.029999999999973, 15.53], [-12.5, 15.75], [-11.970000000000027, 15.53], [-11.819999999999993, 15.18], [-11.75, 15.15], [-11.5, 15.25], [-11.25, 15.15], [-11.0, 15.25], [-10.470000000000027, 15.03], [-10.25, 14.5], [-10.470000000000027, 13.97], [-11.0, 13.75], [-11.25, 13.85], [-11.5, 13.75], [-11.75, 13.85], [-11.819999999999993, 13.82], [-11.970000000000027, 13.47], [-12.5, 13.25], [-12.75, 13.35], [-12.819999999999993, 13.32], [-12.970000000000027, 12.97], [-13.5, 12.75], [-13.75, 12.85], [-14.0, 12.75], [-14.25, 12.85], [-14.319999999999993, 12.82], [-14.350000000000023, 12.75], [-14.25, 12.5], [-14.470000000000027, 11.97], [-15.0, 11.75], [-15.529999999999973, 11.97], [-15.680000000000007, 12.32], [-16.029999999999973, 12.47], [-16.25, 13.0], [-16.120000000000005, 13.3], [-16.529999999999973, 13.47], [-16.75, 14.0], [-16.649999999999977, 14.25], [-16.75, 14.5]], [[-13.350000000000023, 14.75], [-13.319999999999993, 14.68], [-13.25, 14.65], [-13.120000000000005, 14.7], [-13.25, 15.0], [-13.350000000000023, 14.75]]]]}, "2024-12-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.75, 14.5], [-16.529999999999973, 15.03], [-16.0, 15.25], [-15.75, 15.15], [-15.680000000000007, 15.18], [-15.529999999999973, 15.53], [-15.0, 15.75], [-14.75, 15.65], [-14.5, 15.75], [-14.25, 15.65], [-14.0, 15.75], [-13.470000000000027, 15.53], [-13.25, 15.0], [-13.029999999999973, 15.53], [-12.5, 15.75], [-11.970000000000027, 15.53], [-11.819999999999993, 15.18], [-11.75, 15.15], [-11.5, 15.25], [-10.970000000000027, 15.03], [-10.75, 14.5], [-10.970000000000027, 13.97], [-11.5, 13.75], [-11.75, 13.85], [-11.819999999999993, 13.82], [-11.970000000000027, 13.47], [-12.5, 13.25], [-12.75, 13.35], [-12.819999999999993, 13.32], [-12.970000000000027, 12.97], [-13.5, 12.75], [-13.75, 12.85], [-14.0, 12.75], [-14.25, 12.85], [-14.319999999999993, 12.82], [-14.350000000000023, 12.75], [-14.25, 12.5], [-14.470000000000027, 11.97], [-15.0, 11.75], [-15.529999999999973, 11.97], [-15.680000000000007, 12.32], [-16.029999999999973, 12.47], [-16.25, 13.0], [-16.120000000000005, 13.3], [-16.529999999999973, 13.47], [-16.75, 14.0], [-16.649999999999977, 14.25], [-16.75, 14.5]], [[-13.350000000000023, 14.75], [-13.319999999999993, 14.68], [-13.25, 14.65], [-13.120000000000005, 14.7], [-13.25, 15.0], [-13.350000000000023, 14.75]]]]}, "2024-12-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.75, 14.5], [-16.529999999999973, 15.03], [-16.0, 15.25], [-15.75, 15.15], [-15.680000000000007, 15.18], [-15.529999999999973, 15.53], [-15.0, 15.75], [-14.75, 15.65], [-14.5, 15.75], [-14.25, 15.65], [-14.0, 15.75], [-13.470000000000027, 15.53], [-13.25, 15.0], [-13.470000000000027, 14.47], [-14.0, 14.25], [-14.25, 14.35], [-14.319999999999993, 14.32], [-14.470000000000027, 13.97], [-14.819999999999993, 13.82], [-14.970000000000027, 13.47], [-15.5, 13.25], [-15.75, 13.35], [-16.0, 13.25], [-16.529999999999973, 13.47], [-16.75, 14.0], [-16.649999999999977, 14.25], [-16.75, 14.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -5.470513773668358}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.684700944969908}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [22.391421254475972, 23.10397059122721, 23.209200371636314, 23.266373298281735, 23.560528573872148, 22.488842264811183, 22.501172637939533]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [22.2829414367676, 21.436355845133505, 21.05732116699221, 20.828687286376976, 22.039879099528036, 19.21227162679037, 21.593467966715536]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.252125197169846, -2.5704023913379417, -2.603179556299262, -2.5661294201474774, -2.411029668216766, -3.403000409107569, -2.431073153704368]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-2.310872761701546, -3.0714169353443026, -3.432221138918578, -3.6792044643021313, -3.2634902442041493, -5.470513773668358, -3.218180334453166]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4152495429547547, -1.4864725076719434, -1.4850231469270512, -1.5940449083854202, -1.5928415730348446, -2.2492726015641433, -1.5589325881670815]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.4542024999194596, -1.8167001804721936, -1.848180057111291, -2.117386434817003, -2.0280479117742503, -3.5055925885023056, -2.147268926507629]}}