{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:10:48.256530", "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": "2026-Mar-20_to_2026-Mar-23_15.5_11.5"}, "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": 2026030000609}, "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": "March 20 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "March 23 2026"}, "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": 87946.88103833036}, "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": ["Cameroon", "Chad", "Nigeria"]}, "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": 11.5}, "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": 15.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "15.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 14.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 18.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 9.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 12.25}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[13.75, 11.5], [13.97, 12.03], [14.32, 12.18], [14.47, 12.53], [15.0, 12.75], [15.25, 12.65], [15.5, 12.75], [15.75, 12.65], [16.0, 12.75], [16.25, 12.65], [16.5, 12.75], [16.75, 12.65], [17.0, 12.75], [17.25, 12.65], [17.5, 12.75], [18.03, 12.53], [18.18, 12.18], [18.53, 12.03], [18.75, 11.5], [18.53, 10.97], [18.18, 10.82], [18.03, 10.47], [17.68, 10.32], [17.53, 9.97], [17.0, 9.75], [16.75, 9.85], [16.5, 9.75], [16.25, 9.85], [16.18, 9.82], [16.15, 9.75], [16.25, 9.5], [16.03, 8.97], [15.5, 8.75], [14.97, 8.97], [14.82, 9.32], [14.47, 9.47], [14.25, 10.0], [14.35, 10.25], [14.32, 10.32], [13.97, 10.47], [13.75, 11.0], [13.85, 11.25], [13.75, 11.5]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Central-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-03-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[13.75, 11.5], [13.97, 12.03], [14.32, 12.18], [14.47, 12.53], [15.0, 12.75], [15.25, 12.65], [15.5, 12.75], [15.75, 12.65], [16.0, 12.75], [16.25, 12.65], [16.5, 12.75], [16.75, 12.65], [17.0, 12.75], [17.25, 12.65], [17.5, 12.75], [18.03, 12.53], [18.18, 12.18], [18.53, 12.03], [18.75, 11.5], [18.53, 10.97], [18.18, 10.82], [18.03, 10.47], [17.68, 10.32], [17.53, 9.97], [17.0, 9.75], [16.75, 9.85], [16.5, 9.75], [16.25, 9.85], [16.18, 9.82], [16.15, 9.75], [16.25, 9.5], [16.03, 8.97], [15.5, 8.75], [14.97, 8.97], [14.75, 9.5], [14.85, 9.75], [14.82, 9.82], [14.47, 9.97], [14.32, 10.32], [13.97, 10.47], [13.75, 11.0], [13.85, 11.25], [13.75, 11.5]]]]}, "2026-03-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[13.75, 11.5], [13.97, 12.03], [14.32, 12.18], [14.47, 12.53], [15.0, 12.75], [15.25, 12.65], [15.5, 12.75], [15.75, 12.65], [16.0, 12.75], [16.25, 12.65], [16.5, 12.75], [16.75, 12.65], [17.0, 12.75], [17.25, 12.65], [17.5, 12.75], [18.03, 12.53], [18.18, 12.18], [18.53, 12.03], [18.75, 11.5], [18.53, 10.97], [18.18, 10.82], [18.03, 10.47], [17.68, 10.32], [17.53, 9.97], [17.0, 9.75], [16.75, 9.85], [16.5, 9.75], [16.25, 9.85], [16.18, 9.82], [16.15, 9.75], [16.25, 9.5], [16.03, 8.97], [15.5, 8.75], [14.97, 8.97], [14.82, 9.32], [14.47, 9.47], [14.25, 10.0], [14.35, 10.25], [14.32, 10.32], [13.97, 10.47], [13.75, 11.0], [13.85, 11.25], [13.75, 11.5]]]]}, "2026-03-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[13.75, 11.5], [13.97, 12.03], [14.32, 12.18], [14.47, 12.53], [15.0, 12.75], [15.25, 12.65], [15.5, 12.75], [15.75, 12.65], [16.0, 12.75], [16.25, 12.65], [16.5, 12.75], [16.75, 12.65], [17.0, 12.75], [17.25, 12.65], [17.5, 12.75], [18.03, 12.53], [18.18, 12.18], [18.53, 12.03], [18.75, 11.5], [18.53, 10.97], [18.18, 10.82], [18.03, 10.47], [17.68, 10.32], [17.53, 9.97], [17.0, 9.75], [16.75, 9.85], [16.5, 9.75], [16.25, 9.85], [16.18, 9.82], [16.15, 9.75], [16.25, 9.5], [16.03, 8.97], [15.5, 8.75], [14.97, 8.97], [14.82, 9.32], [14.47, 9.47], [14.25, 10.0], [14.35, 10.25], [14.32, 10.32], [13.97, 10.47], [13.75, 11.0], [13.85, 11.25], [13.75, 11.5]]]]}, "2026-03-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[13.97, 10.47], [13.75, 11.0], [13.97, 11.53], [14.32, 11.68], [14.47, 12.03], [15.0, 12.25], [15.25, 12.15], [15.5, 12.25], [15.75, 12.15], [16.0, 12.25], [16.53, 12.03], [16.75, 11.5], [16.65, 11.25], [16.75, 11.0], [16.53, 10.47], [16.0, 10.25], [15.75, 10.35], [15.68, 10.32], [15.65, 10.25], [15.75, 10.0], [15.53, 9.47], [15.0, 9.25], [14.47, 9.47], [14.25, 10.0], [14.35, 10.25], [14.32, 10.32], [13.97, 10.47]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -3.766106284742193}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.794311822405122}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [29.574232264927502, 29.227453946519233, 29.93436172309964, 30.383092781349546]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [28.0043935139974, 28.108857727050804, 28.76014353434249, 29.542498524983728]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.7723997157088007, -3.191309666510396, -2.5956477081123825, -2.223407469397734]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.6588327626399746, -3.766106284742193, -3.282061002735418, -2.6015464009323637]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.500560482101464, -1.7071185336903048, -1.3901470883804377, -1.2361705085881607]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.7990707579836014, -1.9353366256540376, -1.6618639290499302, -1.350434582282123]}}