{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:06:54.858339", "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-14_to_2025-Aug-17_349.0_17.0"}, "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": 2025080000528}, "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 14 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 17 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": 193393.32292834274}, "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": ["Mali", "Mauritania", "Senegal"]}, "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": 17.0}, "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": 349.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "349.0\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": 352.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 14.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 18.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-16.53, 15.53], [-16.0, 15.75], [-15.75, 15.65], [-15.68, 15.68], [-15.53, 16.03], [-15.0, 16.25], [-14.75, 16.15], [-14.5, 16.25], [-14.25, 16.15], [-14.0, 16.25], [-13.75, 16.15], [-13.62, 16.2], [-13.75, 16.5], [-13.53, 17.03], [-13.18, 17.18], [-13.03, 17.53], [-12.68, 17.68], [-12.53, 18.03], [-12.18, 18.18], [-12.03, 18.53], [-11.5, 18.75], [-10.97, 18.53], [-10.82, 18.18], [-10.75, 18.15], [-10.5, 18.25], [-9.97, 18.03], [-9.82, 17.68], [-9.5, 17.54], [-9.0, 17.75], [-8.47, 17.53], [-8.32, 17.18], [-7.97, 17.03], [-7.82, 16.68], [-7.75, 16.65], [-7.5, 16.75], [-6.97, 16.53], [-6.75, 16.0], [-6.97, 15.47], [-7.5, 15.25], [-7.75, 15.35], [-8.0, 15.25], [-8.25, 15.35], [-8.32, 15.32], [-8.47, 14.97], [-9.0, 14.75], [-9.25, 14.85], [-9.32, 14.82], [-9.47, 14.47], [-9.82, 14.32], [-9.97, 13.97], [-10.5, 13.75], [-10.75, 13.85], [-11.0, 13.75], [-11.25, 13.85], [-11.32, 13.82], [-11.47, 13.47], [-12.0, 13.25], [-12.25, 13.35], [-12.5, 13.25], [-12.75, 13.35], [-13.0, 13.25], [-13.25, 13.35], [-13.5, 13.25], [-14.03, 13.47], [-14.18, 13.82], [-14.25, 13.85], [-14.5, 13.75], [-15.03, 13.97], [-15.18, 14.32], [-15.25, 14.35], [-15.5, 14.25], [-15.75, 14.35], [-16.0, 14.25], [-16.53, 14.47], [-16.75, 15.0], [-16.53, 15.53]], [[-12.87, 15.8], [-12.82, 15.68], [-12.75, 15.65], [-12.5, 15.75], [-12.25, 15.65], [-12.12, 15.7], [-12.18, 15.82], [-12.5, 15.96], [-12.87, 15.8]]]]}}, "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": {"2025-08-14T11:30:00.000000000": {"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], [-15.680000000000007, 15.68], [-15.529999999999973, 16.03], [-15.0, 16.25], [-14.75, 16.15], [-14.5, 16.25], [-14.25, 16.15], [-14.0, 16.25], [-13.75, 16.15], [-13.620000000000005, 16.2], [-13.75, 16.5], [-13.529999999999973, 17.03], [-13.180000000000007, 17.18], [-13.029999999999973, 17.53], [-12.5, 17.75], [-12.25, 17.65], [-12.0, 17.75], [-11.75, 17.65], [-11.680000000000007, 17.68], [-11.529999999999973, 18.03], [-11.0, 18.25], [-10.75, 18.15], [-10.5, 18.25], [-9.970000000000027, 18.03], [-9.819999999999993, 17.68], [-9.5, 17.54], [-9.0, 17.75], [-8.470000000000027, 17.53], [-8.319999999999993, 17.18], [-7.970000000000027, 17.03], [-7.819999999999993, 16.68], [-7.75, 16.65], [-7.5, 16.75], [-6.970000000000027, 16.53], [-6.75, 16.0], [-6.970000000000027, 15.47], [-7.5, 15.25], [-7.75, 15.35], [-8.0, 15.25], [-8.25, 15.35], [-8.319999999999993, 15.32], [-8.470000000000027, 14.97], [-9.0, 14.75], [-9.25, 14.85], [-9.319999999999993, 14.82], [-9.470000000000027, 14.47], [-9.819999999999993, 14.32], [-9.970000000000027, 13.97], [-10.5, 13.75], [-10.75, 13.85], [-11.0, 13.75], [-11.25, 13.85], [-11.319999999999993, 13.82], [-11.470000000000027, 13.47], [-12.0, 13.25], [-12.25, 13.35], [-12.5, 13.25], [-12.75, 13.35], [-13.0, 13.25], [-13.25, 13.35], [-13.5, 13.25], [-14.029999999999973, 13.47], [-14.180000000000007, 13.82], [-14.25, 13.85], [-14.5, 13.75], [-15.029999999999973, 13.97], [-15.180000000000007, 14.32], [-15.25, 14.35], [-15.5, 14.25], [-15.75, 14.35], [-16.0, 14.25]], [[-12.120000000000005, 15.7], [-12.180000000000007, 15.82], [-12.5, 15.96], [-12.870000000000005, 15.8], [-12.819999999999993, 15.68], [-12.75, 15.65], [-12.5, 15.75], [-12.25, 15.65], [-12.120000000000005, 15.7]]]]}, "2025-08-15T11:30:00.000000000": {"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], [-15.680000000000007, 15.68], [-15.529999999999973, 16.03], [-15.0, 16.25], [-14.75, 16.15], [-14.5, 16.25], [-14.25, 16.15], [-14.0, 16.25], [-13.75, 16.15], [-13.620000000000005, 16.2], [-13.75, 16.5], [-13.529999999999973, 17.03], [-13.180000000000007, 17.18], [-13.029999999999973, 17.53], [-12.680000000000007, 17.68], [-12.529999999999973, 18.03], [-12.180000000000007, 18.18], [-12.029999999999973, 18.53], [-11.5, 18.75], [-10.970000000000027, 18.53], [-10.819999999999993, 18.18], [-10.75, 18.15], [-10.5, 18.25], [-9.970000000000027, 18.03], [-9.819999999999993, 17.68], [-9.5, 17.54], [-9.0, 17.75], [-8.470000000000027, 17.53], [-8.319999999999993, 17.18], [-7.970000000000027, 17.03], [-7.819999999999993, 16.68], [-7.75, 16.65], [-7.5, 16.75], [-6.970000000000027, 16.53], [-6.75, 16.0], [-6.970000000000027, 15.47], [-7.5, 15.25], [-7.75, 15.35], [-8.0, 15.25], [-8.25, 15.35], [-8.319999999999993, 15.32], [-8.470000000000027, 14.97], [-9.0, 14.75], [-9.25, 14.85], [-9.319999999999993, 14.82], [-9.470000000000027, 14.47], [-9.819999999999993, 14.32], [-9.970000000000027, 13.97], [-10.5, 13.75], [-10.75, 13.85], [-11.0, 13.75], [-11.25, 13.85], [-11.319999999999993, 13.82], [-11.470000000000027, 13.47], [-12.0, 13.25], [-12.25, 13.35], [-12.5, 13.25], [-12.75, 13.35], [-13.0, 13.25], [-13.25, 13.35], [-13.5, 13.25], [-14.029999999999973, 13.47], [-14.180000000000007, 13.82], [-14.25, 13.85], [-14.5, 13.75], [-15.029999999999973, 13.97], [-15.180000000000007, 14.32], [-15.25, 14.35], [-15.5, 14.25], [-15.75, 14.35], [-16.0, 14.25]], [[-12.120000000000005, 15.7], [-12.180000000000007, 15.82], [-12.5, 15.96], [-12.870000000000005, 15.8], [-12.819999999999993, 15.68], [-12.75, 15.65], [-12.5, 15.75], [-12.25, 15.65], [-12.120000000000005, 15.7]]]]}, "2025-08-16T11:30:00.000000000": {"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], [-15.680000000000007, 15.68], [-15.529999999999973, 16.03], [-15.0, 16.25], [-14.75, 16.15], [-14.5, 16.25], [-14.25, 16.15], [-14.0, 16.25], [-13.75, 16.15], [-13.620000000000005, 16.2], [-13.75, 16.5], [-13.529999999999973, 17.03], [-13.180000000000007, 17.18], [-13.029999999999973, 17.53], [-12.680000000000007, 17.68], [-12.529999999999973, 18.03], [-12.180000000000007, 18.18], [-12.029999999999973, 18.53], [-11.5, 18.75], [-10.970000000000027, 18.53], [-10.819999999999993, 18.18], [-10.75, 18.15], [-10.5, 18.25], [-9.970000000000027, 18.03], [-9.819999999999993, 17.68], [-9.5, 17.54], [-9.0, 17.75], [-8.470000000000027, 17.53], [-8.319999999999993, 17.18], [-7.970000000000027, 17.03], [-7.819999999999993, 16.68], [-7.75, 16.65], [-7.5, 16.75], [-6.970000000000027, 16.53], [-6.75, 16.0], [-6.970000000000027, 15.47], [-7.5, 15.25], [-7.75, 15.35], [-8.0, 15.25], [-8.25, 15.35], [-8.319999999999993, 15.32], [-8.470000000000027, 14.97], [-9.0, 14.75], [-9.25, 14.85], [-9.319999999999993, 14.82], [-9.470000000000027, 14.47], [-9.819999999999993, 14.32], [-9.970000000000027, 13.97], [-10.5, 13.75], [-10.75, 13.85], [-11.0, 13.75], [-11.25, 13.85], [-11.319999999999993, 13.82], [-11.470000000000027, 13.47], [-12.0, 13.25], [-12.25, 13.35], [-12.5, 13.25], [-12.75, 13.35], [-13.0, 13.25], [-13.25, 13.35], [-13.5, 13.25], [-14.029999999999973, 13.47], [-14.180000000000007, 13.82], [-14.25, 13.85], [-14.5, 13.75], [-15.029999999999973, 13.97], [-15.180000000000007, 14.32], [-15.25, 14.35], [-15.5, 14.25], [-15.75, 14.35], [-16.0, 14.25]], [[-12.120000000000005, 15.7], [-12.180000000000007, 15.82], [-12.5, 15.96], [-12.870000000000005, 15.8], [-12.819999999999993, 15.68], [-12.75, 15.65], [-12.5, 15.75], [-12.25, 15.65], [-12.120000000000005, 15.7]]]]}, "2025-08-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-13.029999999999973, 17.53], [-12.680000000000007, 17.68], [-12.529999999999973, 18.03], [-12.180000000000007, 18.18], [-12.029999999999973, 18.53], [-11.5, 18.75], [-10.970000000000027, 18.53], [-10.75, 18.0], [-10.850000000000023, 17.75], [-10.819999999999993, 17.68], [-10.75, 17.65], [-10.5, 17.75], [-9.970000000000027, 17.53], [-9.75, 17.0], [-9.850000000000023, 16.75], [-9.75, 16.5], [-9.970000000000027, 15.97], [-10.5, 15.75], [-10.75, 15.85], [-11.0, 15.75], [-11.25, 15.85], [-11.5, 15.75], [-11.75, 15.85], [-12.0, 15.75], [-12.5, 15.96], [-13.0, 15.75], [-13.529999999999973, 15.97], [-13.75, 16.5], [-13.529999999999973, 17.03], [-13.180000000000007, 17.18], [-13.029999999999973, 17.53]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -5.212694293333072}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.938137820876571}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [26.28329649074101, 27.076428809532786, 26.46183622311321, 28.197066634740622]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [24.532961781819665, 25.430014546712243, 25.096242523193382, 27.48322448730471]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.260762872468548, -2.4971994591784, -3.0795423862644724, -2.897133479450802]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.68164747259226, -3.839380267971819, -5.212694293333072, -3.42852434325539]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-2.0439295262359476, -1.5312504696321658, -1.8918217292099082, -1.5001530182107887]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.64099988897921, -1.9786970848278809, -2.6201257360936387, -1.769927021859069]}}