{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:04:19.414350", "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-Apr-01_to_2025-Apr-03_12.0_18.5"}, "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": 2025040000066}, "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 01 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 03 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": 146829.0565334157}, "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": 18.5}, "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": 12.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "12.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 9.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 13.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 16.5}, "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": [[[[9.85, 17.75], [9.75, 18.0], [9.85, 18.25], [9.75, 18.5], [9.85, 18.75], [9.75, 19.0], [9.85, 19.25], [9.75, 19.5], [9.97, 20.03], [10.32, 20.18], [10.47, 20.53], [11.0, 20.75], [11.25, 20.65], [11.5, 20.75], [11.75, 20.65], [12.0, 20.75], [12.25, 20.65], [12.5, 20.75], [13.03, 20.53], [13.18, 20.18], [13.53, 20.03], [13.68, 19.68], [14.03, 19.53], [14.25, 19.0], [14.15, 18.75], [14.25, 18.5], [14.04, 18.0], [14.25, 17.5], [14.03, 16.97], [13.68, 16.82], [13.53, 16.47], [13.0, 16.25], [12.75, 16.35], [12.68, 16.32], [12.53, 15.97], [12.0, 15.75], [11.75, 15.85], [11.5, 15.75], [11.25, 15.85], [11.0, 15.75], [10.75, 15.85], [10.5, 15.75], [10.25, 15.85], [10.0, 15.75], [9.75, 15.85], [9.5, 15.75], [8.97, 15.97], [8.75, 16.5], [8.97, 17.03], [9.32, 17.18], [9.47, 17.53], [9.82, 17.68], [9.85, 17.75]]]]}}, "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": {"2025-04-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[9.47, 17.53], [9.82, 17.68], [9.85, 17.75], [9.75, 18.0], [9.85, 18.25], [9.75, 18.5], [9.85, 18.75], [9.75, 19.0], [9.85, 19.25], [9.75, 19.5], [9.97, 20.03], [10.32, 20.18], [10.47, 20.53], [11.0, 20.75], [11.25, 20.65], [11.5, 20.75], [11.75, 20.65], [12.0, 20.75], [12.25, 20.65], [12.5, 20.75], [13.03, 20.53], [13.18, 20.18], [13.53, 20.03], [13.68, 19.68], [14.03, 19.53], [14.25, 19.0], [14.15, 18.75], [14.25, 18.5], [14.04, 18.0], [14.25, 17.5], [14.03, 16.97], [13.68, 16.82], [13.53, 16.47], [13.0, 16.25], [12.75, 16.35], [12.68, 16.32], [12.53, 15.97], [12.0, 15.75], [11.75, 15.85], [11.5, 15.75], [11.25, 15.85], [11.0, 15.75], [10.75, 15.85], [10.5, 15.75], [10.25, 15.85], [10.0, 15.75], [9.75, 15.85], [9.5, 15.75], [8.97, 15.97], [8.75, 16.5], [8.97, 17.03], [9.32, 17.18], [9.47, 17.53]]]]}, "2025-04-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[9.47, 17.53], [9.82, 17.68], [9.85, 17.75], [9.75, 18.0], [9.85, 18.25], [9.75, 18.5], [9.85, 18.75], [9.75, 19.0], [9.85, 19.25], [9.75, 19.5], [9.97, 20.03], [10.32, 20.18], [10.47, 20.53], [11.0, 20.75], [11.25, 20.65], [11.5, 20.75], [11.75, 20.65], [12.0, 20.75], [12.25, 20.65], [12.5, 20.75], [13.03, 20.53], [13.18, 20.18], [13.53, 20.03], [13.68, 19.68], [14.03, 19.53], [14.25, 19.0], [14.15, 18.75], [14.25, 18.5], [14.04, 18.0], [14.25, 17.5], [14.03, 16.97], [13.68, 16.82], [13.53, 16.47], [13.0, 16.25], [12.75, 16.35], [12.68, 16.32], [12.53, 15.97], [12.0, 15.75], [11.75, 15.85], [11.5, 15.75], [11.25, 15.85], [11.0, 15.75], [10.75, 15.85], [10.5, 15.75], [10.25, 15.85], [10.0, 15.75], [9.75, 15.85], [9.5, 15.75], [8.97, 15.97], [8.75, 16.5], [8.97, 17.03], [9.32, 17.18], [9.47, 17.53]]]]}, "2025-04-03T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[9.47, 17.53], [9.82, 17.68], [9.85, 17.75], [9.75, 18.0], [9.85, 18.25], [9.75, 18.5], [9.85, 18.75], [9.75, 19.0], [9.85, 19.25], [9.75, 19.5], [9.97, 20.03], [10.32, 20.18], [10.47, 20.53], [11.0, 20.75], [11.25, 20.65], [11.5, 20.75], [11.75, 20.65], [12.0, 20.75], [12.25, 20.65], [12.5, 20.75], [13.03, 20.53], [13.18, 20.18], [13.53, 20.03], [13.68, 19.68], [14.03, 19.53], [14.25, 19.0], [14.15, 18.75], [14.25, 18.5], [14.04, 18.0], [14.25, 17.5], [14.03, 16.97], [13.68, 16.82], [13.53, 16.47], [13.0, 16.25], [12.75, 16.35], [12.68, 16.32], [12.53, 15.97], [12.0, 15.75], [11.75, 15.85], [11.5, 15.75], [11.25, 15.85], [11.0, 15.75], [10.75, 15.85], [10.5, 15.75], [10.25, 15.85], [10.0, 15.75], [9.75, 15.85], [9.5, 15.75], [8.97, 15.97], [8.75, 16.5], [8.97, 17.03], [9.32, 17.18], [9.47, 17.53]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -5.698105246924285}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.217754678132019}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [22.381693522135436, 21.535526631673235, 23.315601196289094]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [21.559981282552087, 20.598985290527366, 22.403970336914085]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.9579363935882053, -5.1085756371603255, -3.586752003647533]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.967408698564213, -5.698105246924285, -4.253409133072125]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.7333820121546202, -2.2624453514603453, -1.5370011821191212]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.0701380811066175, -2.5579528267671847, -1.8358255861618118]}}