{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:06:59.784496", "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-20_to_2025-Aug-22_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": 2025080000722}, "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 20 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 22 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": 62350.02617367584}, "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"]}, "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": 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": 348.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 350.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 15.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 17.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-12.75, 16.5], [-12.65, 16.75], [-12.75, 17.0], [-12.53, 17.53], [-12.0, 17.75], [-11.75, 17.65], [-11.5, 17.75], [-11.25, 17.65], [-11.0, 17.75], [-10.75, 17.65], [-10.5, 17.75], [-9.97, 17.53], [-9.82, 17.18], [-9.47, 17.03], [-9.32, 16.68], [-8.97, 16.53], [-8.75, 16.0], [-8.97, 15.47], [-9.32, 15.32], [-9.47, 14.97], [-10.0, 14.75], [-10.25, 14.85], [-10.5, 14.75], [-10.75, 14.85], [-10.82, 14.82], [-10.97, 14.47], [-11.5, 14.25], [-12.03, 14.47], [-12.18, 14.82], [-12.53, 14.97], [-12.75, 15.5], [-12.65, 15.75], [-12.75, 16.0], [-12.65, 16.25], [-12.75, 16.5]]]]}}, "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": {"2025-08-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-12.75, 16.0], [-12.649999999999977, 16.25], [-12.75, 16.5], [-12.649999999999977, 16.75], [-12.75, 17.0], [-12.529999999999973, 17.53], [-12.0, 17.75], [-11.75, 17.65], [-11.5, 17.75], [-11.25, 17.65], [-11.0, 17.75], [-10.75, 17.65], [-10.5, 17.75], [-9.970000000000027, 17.53], [-9.819999999999993, 17.18], [-9.470000000000027, 17.03], [-9.319999999999993, 16.68], [-8.970000000000027, 16.53], [-8.75, 16.0], [-8.970000000000027, 15.47], [-9.319999999999993, 15.32], [-9.470000000000027, 14.97], [-10.0, 14.75], [-10.25, 14.85], [-10.5, 14.75], [-10.75, 14.85], [-10.819999999999993, 14.82], [-10.970000000000027, 14.47], [-11.5, 14.25], [-12.029999999999973, 14.47], [-12.180000000000007, 14.82], [-12.529999999999973, 14.97], [-12.75, 15.5], [-12.649999999999977, 15.75], [-12.75, 16.0]]]]}, "2025-08-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-12.75, 16.0], [-12.649999999999977, 16.25], [-12.75, 16.5], [-12.649999999999977, 16.75], [-12.75, 17.0], [-12.529999999999973, 17.53], [-12.0, 17.75], [-11.75, 17.65], [-11.5, 17.75], [-11.25, 17.65], [-11.0, 17.75], [-10.75, 17.65], [-10.5, 17.75], [-9.970000000000027, 17.53], [-9.819999999999993, 17.18], [-9.470000000000027, 17.03], [-9.319999999999993, 16.68], [-8.970000000000027, 16.53], [-8.75, 16.0], [-8.970000000000027, 15.47], [-9.319999999999993, 15.32], [-9.470000000000027, 14.97], [-10.0, 14.75], [-10.25, 14.85], [-10.5, 14.75], [-10.75, 14.85], [-10.819999999999993, 14.82], [-10.970000000000027, 14.47], [-11.5, 14.25], [-12.029999999999973, 14.47], [-12.180000000000007, 14.82], [-12.529999999999973, 14.97], [-12.75, 15.5], [-12.649999999999977, 15.75], [-12.75, 16.0]]]]}, "2025-08-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-12.75, 16.0], [-12.649999999999977, 16.25], [-12.75, 16.5], [-12.649999999999977, 16.75], [-12.75, 17.0], [-12.529999999999973, 17.53], [-12.0, 17.75], [-11.75, 17.65], [-11.5, 17.75], [-11.25, 17.65], [-11.0, 17.75], [-10.75, 17.65], [-10.5, 17.75], [-9.970000000000027, 17.53], [-9.819999999999993, 17.18], [-9.470000000000027, 17.03], [-9.319999999999993, 16.68], [-8.970000000000027, 16.53], [-8.75, 16.0], [-8.970000000000027, 15.47], [-9.319999999999993, 15.32], [-9.470000000000027, 14.97], [-10.0, 14.75], [-10.25, 14.85], [-10.5, 14.75], [-10.75, 14.85], [-10.819999999999993, 14.82], [-10.970000000000027, 14.47], [-11.5, 14.25], [-12.029999999999973, 14.47], [-12.180000000000007, 14.82], [-12.529999999999973, 14.97], [-12.75, 15.5], [-12.649999999999977, 15.75], [-12.75, 16.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.139161115229683}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.9582833545028473}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [27.18976467072025, 27.034912242586643, 27.117506311810246]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [25.592856343587243, 26.246752675374353, 26.15009714762374]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.9241727014849466, -3.0519661306245913, -2.898711231399004]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.4940748535596526, -4.069932202443908, -4.139161115229683]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.7367681500155787, -1.768617935054797, -1.6405285036954018]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.1918836118985277, -2.2360480931405613, -1.9654398957617671]}}