{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:52:23.791843", "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-12_to_2023-Apr-14_13.0_20.0"}, "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": 2023040000526}, "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 12 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 14 2023"}, "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": 87749.27034906458}, "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": ["Chad", "Niger"]}, "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": 20.0}, "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": 13.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "13.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 13.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 17.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 17.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 20.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[13.0, 20.75], [13.25, 20.65], [13.5, 20.75], [13.75, 20.65], [14.0, 20.75], [14.25, 20.65], [14.5, 20.75], [14.75, 20.65], [15.0, 20.75], [15.53, 20.53], [15.7, 20.13], [15.82, 20.18], [15.97, 20.53], [16.5, 20.75], [17.03, 20.53], [17.25, 20.0], [17.13, 19.7], [17.53, 19.53], [17.75, 19.0], [17.53, 18.47], [17.18, 18.32], [17.03, 17.97], [16.68, 17.82], [16.53, 17.47], [16.18, 17.32], [16.03, 16.97], [15.5, 16.75], [15.25, 16.85], [15.0, 16.75], [14.75, 16.85], [14.5, 16.75], [14.25, 16.85], [14.0, 16.75], [13.47, 16.97], [13.25, 17.5], [13.35, 17.75], [13.25, 18.0], [13.47, 18.53], [13.88, 18.7], [13.82, 18.82], [13.5, 18.96], [13.0, 18.75], [12.47, 18.97], [12.25, 19.5], [12.35, 19.75], [12.25, 20.0], [12.47, 20.53], [13.0, 20.75]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Sahara"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2023-04-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[12.25, 20.0], [12.47, 20.53], [13.0, 20.75], [13.25, 20.65], [13.5, 20.75], [13.75, 20.65], [14.0, 20.75], [14.25, 20.65], [14.5, 20.75], [14.75, 20.65], [15.0, 20.75], [15.53, 20.53], [15.7, 20.13], [15.82, 20.18], [15.97, 20.53], [16.5, 20.75], [17.03, 20.53], [17.25, 20.0], [17.13, 19.7], [17.53, 19.53], [17.75, 19.0], [17.53, 18.47], [17.18, 18.32], [17.03, 17.97], [16.68, 17.82], [16.53, 17.47], [16.18, 17.32], [16.03, 16.97], [15.5, 16.75], [15.25, 16.85], [15.0, 16.75], [14.75, 16.85], [14.5, 16.75], [14.25, 16.85], [14.0, 16.75], [13.47, 16.97], [13.25, 17.5], [13.35, 17.75], [13.25, 18.0], [13.47, 18.53], [13.88, 18.7], [13.82, 18.82], [13.5, 18.96], [13.0, 18.75], [12.47, 18.97], [12.25, 19.5], [12.35, 19.75], [12.25, 20.0]]]]}, "2023-04-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[12.25, 20.0], [12.47, 20.53], [13.0, 20.75], [13.25, 20.65], [13.5, 20.75], [13.75, 20.65], [14.0, 20.75], [14.25, 20.65], [14.5, 20.75], [14.75, 20.65], [15.0, 20.75], [15.53, 20.53], [15.7, 20.13], [15.82, 20.18], [15.97, 20.53], [16.5, 20.75], [17.03, 20.53], [17.25, 20.0], [17.13, 19.7], [17.53, 19.53], [17.75, 19.0], [17.53, 18.47], [17.18, 18.32], [17.03, 17.97], [16.68, 17.82], [16.53, 17.47], [16.18, 17.32], [16.03, 16.97], [15.5, 16.75], [15.25, 16.85], [15.0, 16.75], [14.75, 16.85], [14.5, 16.75], [14.25, 16.85], [14.0, 16.75], [13.47, 16.97], [13.25, 17.5], [13.35, 17.75], [13.25, 18.0], [13.47, 18.53], [13.88, 18.7], [13.82, 18.82], [13.5, 18.96], [13.0, 18.75], [12.47, 18.97], [12.25, 19.5], [12.35, 19.75], [12.25, 20.0]]]]}, "2023-04-14T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[12.25, 20.0], [12.47, 20.53], [13.0, 20.75], [13.25, 20.65], [13.5, 20.75], [13.75, 20.65], [14.0, 20.75], [14.25, 20.65], [14.5, 20.75], [14.75, 20.65], [15.0, 20.75], [15.53, 20.53], [15.7, 20.13], [15.82, 20.18], [15.97, 20.53], [16.5, 20.75], [17.03, 20.53], [17.25, 20.0], [17.13, 19.7], [17.53, 19.53], [17.75, 19.0], [17.53, 18.47], [17.18, 18.32], [17.03, 17.97], [16.68, 17.82], [16.53, 17.47], [16.18, 17.32], [16.03, 16.97], [15.5, 16.75], [15.25, 16.85], [15.0, 16.75], [14.75, 16.85], [14.5, 16.75], [14.25, 16.85], [14.0, 16.75], [13.47, 16.97], [13.25, 17.5], [13.35, 17.75], [13.25, 18.0], [13.47, 18.53], [13.88, 18.7], [13.82, 18.82], [13.5, 18.96], [13.0, 18.75], [12.47, 18.97], [12.25, 19.5], [12.35, 19.75], [12.25, 20.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -5.09910999564687}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.7515455370001645}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [24.83487611775712, 24.63803272147004, 25.63499359724335]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [23.611135368736598, 23.422668287185218, 24.47759729178466]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.733616661865064, -4.138963361991428, -3.382056587144001]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.483638636489957, -5.09910999564687, -3.8215061208230168]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4744031762818672, -1.6696962376288782, -1.3786530611747017]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.6953402993478812, -2.0357571777118157, -1.4993483496780111]}}