{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:13:21.070971", "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": "2021-Sep-03_to_2021-Sep-06_28.0_15.0"}, "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": 2021090000211}, "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 03 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 06 2021"}, "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": 102009.2044089455}, "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": ["Sudan"]}, "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": 15.0}, "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": 28.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "28.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 25.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 29.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 11.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 15.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[25.25, 13.0], [25.46, 13.5], [25.25, 14.0], [25.35, 14.25], [25.25, 14.5], [25.35, 14.75], [25.25, 15.0], [25.35, 15.25], [25.25, 15.5], [25.47, 16.03], [26.0, 16.25], [26.25, 16.15], [26.5, 16.25], [27.03, 16.03], [27.18, 15.68], [27.25, 15.65], [27.32, 15.68], [27.47, 16.03], [28.0, 16.25], [28.25, 16.15], [28.5, 16.25], [29.03, 16.03], [29.18, 15.68], [29.53, 15.53], [29.75, 15.0], [29.53, 14.47], [29.18, 14.32], [29.03, 13.97], [28.5, 13.75], [28.25, 13.85], [28.0, 13.75], [27.75, 13.85], [27.68, 13.82], [27.65, 13.75], [27.68, 13.68], [28.03, 13.53], [28.25, 13.0], [28.03, 12.47], [27.68, 12.32], [27.53, 11.97], [27.18, 11.82], [27.03, 11.47], [26.5, 11.25], [26.25, 11.35], [26.18, 11.32], [26.03, 10.97], [25.5, 10.75], [25.25, 10.85], [25.0, 10.75], [24.47, 10.97], [24.25, 11.5], [24.47, 12.03], [24.82, 12.18], [24.97, 12.53], [25.32, 12.68], [25.35, 12.75], [25.25, 13.0]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Sahara", "Central-Africa", "N.Eastern-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-09-03T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[27.25, 15.5], [27.47, 16.03], [28.0, 16.25], [28.25, 16.15], [28.5, 16.25], [29.03, 16.03], [29.18, 15.68], [29.53, 15.53], [29.75, 15.0], [29.53, 14.47], [29.0, 14.25], [28.75, 14.35], [28.5, 14.25], [28.25, 14.35], [28.0, 14.25], [27.47, 14.47], [27.25, 15.0], [27.35, 15.25], [27.25, 15.5]]]]}, "2021-09-04T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[24.97, 12.53], [25.32, 12.68], [25.35, 12.75], [25.25, 13.0], [25.46, 13.5], [25.25, 14.0], [25.35, 14.25], [25.25, 14.5], [25.35, 14.75], [25.25, 15.0], [25.35, 15.25], [25.25, 15.5], [25.47, 16.03], [26.0, 16.25], [26.25, 16.15], [26.5, 16.25], [27.03, 16.03], [27.18, 15.68], [27.25, 15.65], [27.32, 15.68], [27.47, 16.03], [28.0, 16.25], [28.25, 16.15], [28.5, 16.25], [29.03, 16.03], [29.18, 15.68], [29.53, 15.53], [29.75, 15.0], [29.53, 14.47], [29.18, 14.32], [29.03, 13.97], [28.5, 13.75], [28.25, 13.85], [28.0, 13.75], [27.75, 13.85], [27.68, 13.82], [27.65, 13.75], [27.68, 13.68], [28.03, 13.53], [28.25, 13.0], [28.03, 12.47], [27.68, 12.32], [27.53, 11.97], [27.18, 11.82], [27.03, 11.47], [26.5, 11.25], [26.25, 11.35], [26.18, 11.32], [26.03, 10.97], [25.5, 10.75], [25.25, 10.85], [25.0, 10.75], [24.47, 10.97], [24.25, 11.5], [24.47, 12.03], [24.82, 12.18], [24.97, 12.53]]]]}, "2021-09-05T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[24.97, 12.53], [25.32, 12.68], [25.35, 12.75], [25.25, 13.0], [25.46, 13.5], [25.25, 14.0], [25.35, 14.25], [25.25, 14.5], [25.35, 14.75], [25.25, 15.0], [25.35, 15.25], [25.25, 15.5], [25.47, 16.03], [26.0, 16.25], [26.25, 16.15], [26.5, 16.25], [27.03, 16.03], [27.18, 15.68], [27.25, 15.65], [27.32, 15.68], [27.47, 16.03], [28.0, 16.25], [28.25, 16.15], [28.5, 16.25], [29.03, 16.03], [29.18, 15.68], [29.53, 15.53], [29.75, 15.0], [29.53, 14.47], [29.18, 14.32], [29.03, 13.97], [28.5, 13.75], 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13.75], [27.75, 13.85], [27.68, 13.82], [27.65, 13.75], [27.68, 13.68], [28.03, 13.53], [28.25, 13.0], [28.03, 12.47], [27.68, 12.32], [27.53, 11.97], [27.18, 11.82], [27.03, 11.47], [26.5, 11.25], [26.25, 11.35], [26.18, 11.32], [26.03, 10.97], [25.5, 10.75], [25.25, 10.85], [25.0, 10.75], [24.47, 10.97], [24.25, 11.5], [24.47, 12.03], [24.82, 12.18], [24.97, 12.53]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.6766160228644935}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.984423794789384}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [28.39560693183944, 25.68582572856309, 25.190928827556604, 26.076442851894342]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [27.62648017692419, 24.56735914615308, 23.2881912675241, 24.49872201375456]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.3583976114434675, -2.957525938827513, -3.519465476432943, -2.542337571150391]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-2.6347178085784435, -4.090430392544306, -4.6766160228644935, -3.6748598406306883]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5881596408910696, -1.911152436698798, -2.272749285220595, -1.6518383790573898]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.7467946751264014, -2.559749366147745, -2.902976209825992, -2.6558274237238195]}}