{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:55:16.800406", "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-Sep-30_to_2023-Oct-04_11.5_14.5"}, "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": 2023090000571}, "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": "September 30 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "October 04 2023"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 5}, "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": 107720.1519837556}, "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": ["Niger"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["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": 14.5}, "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": 11.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "11.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 8.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 12.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 13.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 16.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[7.97, 15.03], [8.32, 15.18], [8.47, 15.53], [8.82, 15.68], [8.97, 16.03], [9.5, 16.25], [9.75, 16.15], [10.0, 16.25], [10.25, 16.15], [10.5, 16.25], [10.75, 16.15], [10.82, 16.18], [10.97, 16.53], [11.5, 16.75], [12.03, 16.53], [12.25, 16.0], [12.15, 15.75], [12.18, 15.68], [12.53, 15.53], [12.68, 15.18], [13.03, 15.03], [13.25, 14.5], [13.03, 13.97], [12.68, 13.82], [12.53, 13.47], [12.0, 13.25], [11.75, 13.35], [11.5, 13.25], [11.25, 13.35], [11.18, 13.32], [11.03, 12.97], [10.5, 12.75], [10.25, 12.85], [10.0, 12.75], [9.75, 12.85], [9.5, 12.75], [9.25, 12.85], [9.0, 12.75], [8.75, 12.85], [8.5, 12.75], [7.97, 12.97], [7.82, 13.32], [7.47, 13.47], [7.25, 14.0], [7.47, 14.53], [7.82, 14.68], [7.97, 15.03]]]]}}, "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": {"2023-09-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[7.25, 14.0], [7.47, 14.53], [7.82, 14.68], [7.97, 15.03], [8.32, 15.18], [8.47, 15.53], [9.0, 15.75], [9.53, 15.53], [9.68, 15.18], [10.03, 15.03], [10.25, 14.5], [10.15, 14.25], [10.25, 14.0], [10.15, 13.75], [10.25, 13.5], [10.03, 12.97], [9.5, 12.75], [9.25, 12.85], [9.0, 12.75], [8.75, 12.85], [8.5, 12.75], [7.97, 12.97], [7.82, 13.32], [7.47, 13.47], [7.25, 14.0]]], [[[11.0, 15.25], [11.25, 15.15], [11.5, 15.25], [11.75, 15.15], [12.0, 15.25], [12.25, 15.15], [12.5, 15.25], [13.03, 15.03], [13.25, 14.5], [13.03, 13.97], [12.68, 13.82], [12.53, 13.47], [12.0, 13.25], [11.47, 13.47], [11.32, 13.82], [11.25, 13.85], [11.0, 13.75], [10.47, 13.97], [10.25, 14.5], [10.47, 15.03], [11.0, 15.25]]]]}, "2023-10-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[7.47, 13.47], [7.25, 14.0], [7.47, 14.53], [7.82, 14.68], [7.97, 15.03], [8.32, 15.18], [8.47, 15.53], [8.82, 15.68], [8.97, 16.03], [9.5, 16.25], [9.75, 16.15], [10.0, 16.25], [10.25, 16.15], [10.5, 16.25], [10.75, 16.15], [10.82, 16.18], [10.97, 16.53], [11.5, 16.75], [12.03, 16.53], [12.25, 16.0], [12.15, 15.75], [12.18, 15.68], [12.53, 15.53], [12.68, 15.18], [13.03, 15.03], [13.25, 14.5], [13.03, 13.97], [12.68, 13.82], [12.53, 13.47], [12.0, 13.25], [11.75, 13.35], [11.5, 13.25], [11.25, 13.35], [11.18, 13.32], [11.03, 12.97], [10.5, 12.75], [10.25, 12.85], [10.0, 12.75], [9.75, 12.85], [9.5, 12.75], [9.25, 12.85], [9.0, 12.75], [8.75, 12.85], [8.5, 12.75], [7.97, 12.97], [7.82, 13.32], [7.47, 13.47]]]]}, "2023-10-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[7.47, 13.47], [7.25, 14.0], [7.47, 14.53], [7.82, 14.68], [7.97, 15.03], [8.32, 15.18], [8.47, 15.53], [8.82, 15.68], [8.97, 16.03], [9.5, 16.25], [9.75, 16.15], [10.0, 16.25], [10.25, 16.15], [10.5, 16.25], [10.75, 16.15], [10.82, 16.18], [10.97, 16.53], [11.5, 16.75], [12.03, 16.53], [12.25, 16.0], [12.15, 15.75], [12.18, 15.68], [12.53, 15.53], [12.68, 15.18], [13.03, 15.03], [13.25, 14.5], [13.03, 13.97], [12.68, 13.82], [12.53, 13.47], [12.0, 13.25], [11.75, 13.35], [11.5, 13.25], [11.25, 13.35], [11.18, 13.32], [11.03, 12.97], [10.5, 12.75], [10.25, 12.85], [10.0, 12.75], [9.75, 12.85], [9.5, 12.75], [9.25, 12.85], [9.0, 12.75], [8.75, 12.85], [8.5, 12.75], [7.97, 12.97], [7.82, 13.32], [7.47, 13.47]]]]}, "2023-10-03T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[8.47, 15.53], [8.82, 15.68], [8.97, 16.03], [9.5, 16.25], [9.75, 16.15], [10.0, 16.25], [10.25, 16.15], [10.5, 16.25], [10.75, 16.15], [10.82, 16.18], [10.97, 16.53], [11.5, 16.75], [12.03, 16.53], [12.25, 16.0], [12.15, 15.75], [12.18, 15.68], [12.53, 15.53], [12.68, 15.18], [13.03, 15.03], [13.25, 14.5], [13.03, 13.97], [12.68, 13.82], [12.53, 13.47], [12.0, 13.25], [11.75, 13.35], [11.5, 13.25], [11.25, 13.35], [11.18, 13.32], [11.03, 12.97], [10.5, 12.75], [10.25, 12.85], [10.0, 12.75], [9.47, 12.97], [9.32, 13.32], [8.97, 13.47], [8.8, 13.88], [8.5, 13.75], [7.97, 13.97], [7.75, 14.5], [7.97, 15.03], [8.32, 15.18], [8.47, 15.53]]]]}, "2023-10-04T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[9.75, 14.5], [9.85, 14.75], [9.75, 15.0], [9.97, 15.53], [10.5, 15.75], [10.75, 15.65], [11.0, 15.75], [11.25, 15.65], [11.5, 15.75], [12.03, 15.53], [12.18, 15.18], [12.53, 15.03], [12.75, 14.5], [12.53, 13.97], [12.0, 13.75], [11.75, 13.85], [11.68, 13.82], [11.53, 13.47], [11.0, 13.25], [10.75, 13.35], [10.5, 13.25], [9.97, 13.47], [9.75, 14.0], [9.85, 14.25], [9.75, 14.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -6.543536400001869}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.6758021324290793}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [28.85635466842649, 25.39971506743626, 26.851502630756727, 28.008571253259504, 29.047632650766786]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [27.55720250853244, 24.457458384438553, 24.98323125215944, 26.514410603665, 28.508285407419805]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-1.8452531772755343, -5.362957819716265, -3.8416485154443274, -2.8465741624855907, -2.1900598968657743]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-2.3762296332214987, -6.543536400001869, -6.026314267528278, -4.701507711163515, -2.8134003154927427]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4358078990912633, -4.005910140480228, -2.7398435519062687, -2.026674320366033, -1.7213749736590387]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.8226395696999003, -4.9034474541214905, -4.1228667432606825, -3.338659866848083, -2.269155872140293]}}