{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:52:20.323312", "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": "2023-Apr-06_to_2023-Apr-09_354.5_13.0"}, "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": 2023040000346}, "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": "April 06 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 09 2023"}, "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": 102896.56909067315}, "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": ["Burkina Faso", "Ghana", "Mali"]}, "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": 13.0}, "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": 354.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "354.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 354.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 358.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 10.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 13.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-6.15, 12.75], [-6.25, 13.0], [-6.15, 13.25], [-6.25, 13.5], [-6.03, 14.03], [-5.5, 14.25], [-4.97, 14.03], [-4.82, 13.68], [-4.47, 13.53], [-4.32, 13.18], [-4.25, 13.15], [-4.0, 13.25], [-3.47, 13.03], [-3.32, 12.68], [-3.25, 12.65], [-3.18, 12.68], [-3.03, 13.03], [-2.5, 13.25], [-1.97, 13.03], [-1.75, 12.5], [-1.85, 12.25], [-1.82, 12.18], [-1.47, 12.03], [-1.25, 11.5], [-1.35, 11.25], [-1.25, 11.0], [-1.35, 10.75], [-1.25, 10.5], [-1.47, 9.97], [-2.0, 9.75], [-2.25, 9.85], [-2.5, 9.75], [-2.75, 9.85], [-3.0, 9.75], [-3.25, 9.85], [-3.5, 9.75], [-4.03, 9.97], [-4.2, 10.38], [-4.5, 10.25], [-5.03, 10.47], [-5.18, 10.82], [-5.25, 10.85], [-5.5, 10.75], [-5.75, 10.85], [-6.0, 10.75], [-6.53, 10.97], [-6.75, 11.5], [-6.65, 11.75], [-6.75, 12.0], [-6.53, 12.53], [-6.18, 12.68], [-6.15, 12.75]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Western-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2023-04-06T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-6.75, 12.0], [-6.529999999999973, 12.53], [-6.180000000000007, 12.68], [-6.149999999999977, 12.75], [-6.25, 13.0], [-6.029999999999973, 13.53], [-5.5, 13.75], [-4.970000000000027, 13.53], [-4.819999999999993, 13.18], [-4.75, 13.15], [-4.5, 13.25], [-4.25, 13.15], [-4.0, 13.25], [-3.4700000000000273, 13.03], [-3.319999999999993, 12.68], [-3.25, 12.65], [-3.180000000000007, 12.68], [-3.0299999999999727, 13.03], [-2.5, 13.25], [-1.9700000000000273, 13.03], [-1.75, 12.5], [-1.8500000000000227, 12.25], [-1.8199999999999932, 12.18], [-1.4700000000000273, 12.03], [-1.25, 11.5], [-1.3500000000000227, 11.25], [-1.25, 11.0], [-1.3500000000000227, 10.75], [-1.25, 10.5], [-1.4700000000000273, 9.97], [-2.0, 9.75], [-2.25, 9.85], [-2.5, 9.75], [-2.75, 9.85], [-3.0, 9.75], [-3.25, 9.85], [-3.5, 9.75], [-4.029999999999973, 9.97], [-4.199999999999989, 10.38], [-4.5, 10.25], [-5.029999999999973, 10.47], [-5.180000000000007, 10.82], [-5.25, 10.85], [-5.5, 10.75], [-5.75, 10.85], [-6.0, 10.75], [-6.529999999999973, 10.97], [-6.75, 11.5], [-6.649999999999977, 11.75], [-6.75, 12.0]]]]}, "2023-04-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-6.75, 12.0], [-6.529999999999973, 12.53], [-6.180000000000007, 12.68], [-6.149999999999977, 12.75], [-6.25, 13.0], [-6.149999999999977, 13.25], [-6.25, 13.5], [-6.029999999999973, 14.03], [-5.5, 14.25], [-4.970000000000027, 14.03], [-4.819999999999993, 13.68], [-4.470000000000027, 13.53], [-4.319999999999993, 13.18], [-4.25, 13.15], [-4.0, 13.25], [-3.4700000000000273, 13.03], [-3.319999999999993, 12.68], [-3.25, 12.65], [-3.180000000000007, 12.68], [-3.0299999999999727, 13.03], [-2.5, 13.25], [-1.9700000000000273, 13.03], [-1.75, 12.5], [-1.8500000000000227, 12.25], [-1.8199999999999932, 12.18], [-1.4700000000000273, 12.03], [-1.25, 11.5], [-1.3500000000000227, 11.25], [-1.25, 11.0], [-1.3500000000000227, 10.75], [-1.25, 10.5], [-1.4700000000000273, 9.97], [-2.0, 9.75], [-2.25, 9.85], [-2.5, 9.75], [-2.75, 9.85], [-3.0, 9.75], [-3.25, 9.85], [-3.5, 9.75], [-4.029999999999973, 9.97], [-4.199999999999989, 10.38], [-4.5, 10.25], [-5.029999999999973, 10.47], [-5.180000000000007, 10.82], [-5.25, 10.85], [-5.5, 10.75], [-5.75, 10.85], [-6.0, 10.75], [-6.529999999999973, 10.97], [-6.75, 11.5], [-6.649999999999977, 11.75], [-6.75, 12.0]]]]}, "2023-04-08T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-6.75, 12.0], [-6.529999999999973, 12.53], [-6.180000000000007, 12.68], [-6.149999999999977, 12.75], [-6.25, 13.0], [-6.149999999999977, 13.25], [-6.25, 13.5], [-6.029999999999973, 14.03], [-5.5, 14.25], [-4.970000000000027, 14.03], [-4.819999999999993, 13.68], [-4.470000000000027, 13.53], [-4.319999999999993, 13.18], [-4.25, 13.15], [-4.0, 13.25], [-3.4700000000000273, 13.03], [-3.319999999999993, 12.68], [-3.25, 12.65], [-3.180000000000007, 12.68], [-3.0299999999999727, 13.03], [-2.5, 13.25], [-1.9700000000000273, 13.03], [-1.75, 12.5], [-1.8500000000000227, 12.25], [-1.8199999999999932, 12.18], [-1.4700000000000273, 12.03], [-1.25, 11.5], [-1.3500000000000227, 11.25], [-1.25, 11.0], [-1.3500000000000227, 10.75], [-1.25, 10.5], [-1.4700000000000273, 9.97], [-2.0, 9.75], [-2.25, 9.85], [-2.5, 9.75], [-2.75, 9.85], [-3.0, 9.75], [-3.25, 9.85], [-3.5, 9.75], [-4.029999999999973, 9.97], [-4.199999999999989, 10.38], [-4.5, 10.25], [-5.029999999999973, 10.47], [-5.180000000000007, 10.82], [-5.25, 10.85], [-5.5, 10.75], [-5.75, 10.85], [-6.0, 10.75], [-6.529999999999973, 10.97], [-6.75, 11.5], [-6.649999999999977, 11.75], [-6.75, 12.0]]]]}, "2023-04-09T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-6.25, 13.5], [-6.029999999999973, 14.03], [-5.5, 14.25], [-4.970000000000027, 14.03], [-4.819999999999993, 13.68], [-4.470000000000027, 13.53], [-4.25, 13.0], [-4.350000000000023, 12.75], [-4.25, 12.5], [-4.470000000000027, 11.97], [-5.0, 11.75], [-5.529999999999973, 11.97], [-5.680000000000007, 12.32], [-6.029999999999973, 12.47], [-6.25, 13.0], [-6.149999999999977, 13.25], [-6.25, 13.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -5.666959433824218}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.2110646195558563}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [28.82085888324059, 29.821659635197705, 28.596528183135206, 30.649691440890592]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [26.2448817247365, 28.80069001140936, 26.9877635113682, 30.463934126650145]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.5648281459573106, -2.5225808231094184, -3.7014547514000706, -2.064752557463123]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.666959433824218, -2.9171064951910353, -5.119144917535607, -2.3726739795082494]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-2.3709307597625218, -1.641282948378371, -2.445516302802888, -1.4490869795628418]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-3.5914891160804627, -1.8720625218412212, -3.4800854612416514, -1.7061341445712241]}}