{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:08:51.512616", "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-Nov-25_to_2025-Nov-30_345.0_11.5"}, "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": 2025110000702}, "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": "November 25 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "November 30 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 6}, "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": 105065.23381931889}, "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", "Guinea-Bissau", "Mali", "Mauritania", "Senegal"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Africa", "Africa", "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": 11.5}, "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": 345.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "345.0\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": 349.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 11.0}, "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": [[[[-16.25, 12.5], [-16.15, 12.75], [-16.25, 13.0], [-16.03, 13.53], [-15.68, 13.68], [-15.59, 13.89], [-15.54, 14.0], [-15.75, 14.5], [-15.53, 15.03], [-15.0, 15.25], [-14.75, 15.15], [-14.68, 15.18], [-14.53, 15.53], [-14.0, 15.75], [-13.75, 15.65], [-13.5, 15.75], [-13.25, 15.65], [-13.0, 15.75], [-12.75, 15.65], [-12.68, 15.68], [-12.53, 16.03], [-12.0, 16.25], [-11.75, 16.15], [-11.5, 16.25], [-10.97, 16.03], [-10.82, 15.68], [-10.47, 15.53], [-10.25, 15.0], [-10.47, 14.47], [-10.82, 14.32], [-10.97, 13.97], [-11.5, 13.75], [-11.75, 13.85], [-12.0, 13.75], [-12.25, 13.85], [-12.5, 13.75], [-12.75, 13.85], [-12.82, 13.82], [-12.97, 13.47], [-13.32, 13.32], [-13.46, 13.0], [-13.25, 12.5], [-13.35, 12.25], [-13.25, 12.0], [-13.47, 11.47], [-13.82, 11.32], [-13.97, 10.97], [-14.32, 10.82], [-14.47, 10.47], [-15.0, 10.25], [-15.53, 10.47], [-15.75, 11.0], [-15.65, 11.25], [-15.68, 11.32], [-16.03, 11.47], [-16.25, 12.0], [-16.15, 12.25], [-16.25, 12.5]]]]}}, "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": {"2025-11-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.25, 12.5], [-16.149999999999977, 12.75], [-16.25, 13.0], [-16.029999999999973, 13.53], [-15.680000000000007, 13.68], [-15.54000000000002, 14.0], [-15.75, 14.5], [-15.529999999999973, 15.03], [-15.0, 15.25], [-14.75, 15.15], [-14.680000000000007, 15.18], [-14.529999999999973, 15.53], [-14.0, 15.75], [-13.75, 15.65], [-13.5, 15.75], [-13.25, 15.65], [-13.0, 15.75], [-12.75, 15.65], [-12.680000000000007, 15.68], [-12.529999999999973, 16.03], [-12.0, 16.25], [-11.75, 16.15], [-11.5, 16.25], [-10.970000000000027, 16.03], [-10.819999999999993, 15.68], [-10.470000000000027, 15.53], [-10.25, 15.0], [-10.470000000000027, 14.47], [-10.819999999999993, 14.32], [-10.970000000000027, 13.97], [-11.5, 13.75], [-11.75, 13.85], [-12.0, 13.75], [-12.25, 13.85], [-12.5, 13.75], [-12.75, 13.85], [-12.819999999999993, 13.82], [-12.970000000000027, 13.47], [-13.5, 13.25], [-13.75, 13.35], [-13.819999999999993, 13.32], [-13.850000000000023, 13.25], [-13.75, 13.0], [-13.850000000000023, 12.75], [-13.819999999999993, 12.68], [-13.470000000000027, 12.53], [-13.25, 12.0], [-13.470000000000027, 11.47], [-13.819999999999993, 11.32], [-13.970000000000027, 10.97], [-14.5, 10.75], [-14.75, 10.85], [-15.0, 10.75], [-15.529999999999973, 10.97], [-15.680000000000007, 11.32], [-16.029999999999973, 11.47], [-16.25, 12.0], [-16.149999999999977, 12.25], [-16.25, 12.5]]]]}, "2025-11-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.25, 12.5], [-16.149999999999977, 12.75], [-16.25, 13.0], [-16.029999999999973, 13.53], [-15.680000000000007, 13.68], [-15.54000000000002, 14.0], [-15.75, 14.5], [-15.529999999999973, 15.03], [-15.0, 15.25], [-14.75, 15.15], [-14.680000000000007, 15.18], [-14.529999999999973, 15.53], [-14.0, 15.75], [-13.75, 15.65], [-13.5, 15.75], [-13.25, 15.65], [-13.0, 15.75], [-12.75, 15.65], [-12.680000000000007, 15.68], [-12.529999999999973, 16.03], [-12.0, 16.25], [-11.75, 16.15], [-11.5, 16.25], [-10.970000000000027, 16.03], [-10.819999999999993, 15.68], [-10.470000000000027, 15.53], [-10.25, 15.0], [-10.470000000000027, 14.47], [-10.819999999999993, 14.32], [-10.970000000000027, 13.97], [-11.5, 13.75], [-11.75, 13.85], [-12.0, 13.75], [-12.25, 13.85], [-12.5, 13.75], [-12.75, 13.85], [-12.819999999999993, 13.82], [-12.970000000000027, 13.47], [-13.319999999999993, 13.32], [-13.45999999999998, 13.0], [-13.25, 12.5], [-13.350000000000023, 12.25], [-13.25, 12.0], [-13.470000000000027, 11.47], [-13.819999999999993, 11.32], [-13.970000000000027, 10.97], [-14.319999999999993, 10.82], [-14.470000000000027, 10.47], [-15.0, 10.25], [-15.529999999999973, 10.47], [-15.75, 11.0], [-15.649999999999977, 11.25], [-15.680000000000007, 11.32], [-16.029999999999973, 11.47], [-16.25, 12.0], [-16.149999999999977, 12.25], [-16.25, 12.5]]]]}, "2025-11-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.25, 12.5], [-16.149999999999977, 12.75], [-16.25, 13.0], [-16.029999999999973, 13.53], [-15.680000000000007, 13.68], [-15.54000000000002, 14.0], [-15.75, 14.5], [-15.529999999999973, 15.03], [-15.0, 15.25], [-14.75, 15.15], [-14.680000000000007, 15.18], [-14.529999999999973, 15.53], [-14.0, 15.75], [-13.75, 15.65], [-13.5, 15.75], [-13.25, 15.65], [-13.0, 15.75], [-12.75, 15.65], [-12.680000000000007, 15.68], [-12.529999999999973, 16.03], [-12.0, 16.25], [-11.75, 16.15], [-11.5, 16.25], [-10.970000000000027, 16.03], [-10.819999999999993, 15.68], [-10.470000000000027, 15.53], [-10.25, 15.0], [-10.470000000000027, 14.47], [-10.819999999999993, 14.32], [-10.970000000000027, 13.97], [-11.5, 13.75], [-11.75, 13.85], [-12.0, 13.75], [-12.25, 13.85], [-12.5, 13.75], [-12.75, 13.85], [-12.819999999999993, 13.82], [-12.970000000000027, 13.47], [-13.319999999999993, 13.32], [-13.45999999999998, 13.0], [-13.25, 12.5], [-13.350000000000023, 12.25], [-13.25, 12.0], [-13.470000000000027, 11.47], [-13.819999999999993, 11.32], [-13.970000000000027, 10.97], [-14.319999999999993, 10.82], [-14.470000000000027, 10.47], [-15.0, 10.25], [-15.529999999999973, 10.47], [-15.75, 11.0], [-15.649999999999977, 11.25], [-15.680000000000007, 11.32], [-16.029999999999973, 11.47], [-16.25, 12.0], [-16.149999999999977, 12.25], [-16.25, 12.5]]]]}, "2025-11-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.25, 12.5], [-16.029999999999973, 13.03], [-15.680000000000007, 13.18], [-15.649999999999977, 13.25], [-15.75, 13.5], [-15.529999999999973, 14.03], [-15.180000000000007, 14.18], [-15.029999999999973, 14.53], [-14.5, 14.75], [-14.0, 14.54], [-13.5, 14.75], [-13.199999999999989, 14.62], [-13.149999999999977, 14.75], [-13.25, 15.0], [-13.029999999999973, 15.53], [-12.680000000000007, 15.68], [-12.529999999999973, 16.03], [-12.0, 16.25], [-11.75, 16.15], [-11.5, 16.25], [-10.970000000000027, 16.03], [-10.75, 15.5], [-10.95999999999998, 15.0], [-10.75, 14.5], [-10.970000000000027, 13.97], [-11.5, 13.75], [-11.75, 13.85], [-12.0, 13.75], [-12.25, 13.85], [-12.5, 13.75], [-12.800000000000011, 13.88], [-12.970000000000027, 13.47], [-13.319999999999993, 13.32], [-13.45999999999998, 13.0], [-13.25, 12.5], [-13.350000000000023, 12.25], [-13.25, 12.0], [-13.470000000000027, 11.47], [-13.819999999999993, 11.32], [-13.970000000000027, 10.97], [-14.319999999999993, 10.82], [-14.470000000000027, 10.47], [-15.0, 10.25], [-15.529999999999973, 10.47], [-15.75, 11.0], [-15.649999999999977, 11.25], [-15.680000000000007, 11.32], [-16.029999999999973, 11.47], [-16.25, 12.0], [-16.149999999999977, 12.25], [-16.25, 12.5]]]]}, "2025-11-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.029999999999973, 11.47], [-16.25, 12.0], [-16.029999999999973, 12.53], [-15.5, 12.75], [-15.25, 12.65], [-15.0, 12.75], [-14.5, 12.54], [-14.0, 12.75], [-13.470000000000027, 12.53], [-13.25, 12.0], [-13.470000000000027, 11.47], [-13.819999999999993, 11.32], [-13.970000000000027, 10.97], [-14.319999999999993, 10.82], [-14.470000000000027, 10.47], [-15.0, 10.25], [-15.529999999999973, 10.47], [-15.75, 11.0], [-15.649999999999977, 11.25], [-15.680000000000007, 11.32], [-16.029999999999973, 11.47]]]]}, "2025-11-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.029999999999973, 11.47], [-16.25, 12.0], [-16.029999999999973, 12.53], [-15.5, 12.75], [-14.970000000000027, 12.53], [-14.819999999999993, 12.18], [-14.470000000000027, 12.03], [-14.25, 11.5], [-14.350000000000023, 11.25], [-14.25, 11.0], [-14.470000000000027, 10.47], [-15.0, 10.25], [-15.529999999999973, 10.47], [-15.75, 11.0], [-15.649999999999977, 11.25], [-15.680000000000007, 11.32], [-16.029999999999973, 11.47]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.2137325386713655}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.2177795028387735}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [25.579990641276027, 24.781220318022235, 25.618820771716912, 25.521725618666608, 25.36315985785592, 25.449898444281757]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [24.74158630371096, 23.737009938557946, 24.693327840169275, 24.502544657389365, 24.776177978515648, 24.986248270670615]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.168928971194175, -2.8845796726696626, -1.9708868792236542, -1.9104724371055608, -1.5581497684683352, -1.5152107738926854]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.5326893888611153, -4.2137325386713655, -2.9963538265577654, -2.3335266167487703, -1.9272821589067348, -1.7099930650441024]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.899684253090716, -2.447617545605764, -1.6420367354516592, -1.6147947394571585, -1.6951521018241171, -1.7496347817333888]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.76050961909541, -3.1391772680553798, -2.3633056145081883, -1.9534498331055334, -2.1189624100558793, -1.79994144780672]}}