{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:25:36.446843", "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-May-24_to_2021-May-30_15.0_19.5"}, "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": 2021050000975}, "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": "May 24 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 30 2021"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 7}, "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": 604724.5391800021}, "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", "Libya", "Niger", "Sudan"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Sahara"]}, "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": 19.5}, "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": 15.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "15.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 9.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 25.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 15.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 21.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-05-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[15.0, 20.25], [15.25, 20.15], [15.5, 20.25], [15.75, 20.15], [16.0, 20.25], [16.53, 20.03], [16.68, 19.68], [16.75, 19.65], [16.82, 19.68], [16.97, 20.03], [17.5, 20.25], [17.75, 20.15], [18.0, 20.25], [18.25, 20.15], [18.32, 20.18], [18.35, 20.25], [18.25, 20.5], [18.47, 21.03], [19.0, 21.25], [19.25, 21.15], [19.32, 21.18], [19.47, 21.53], [20.0, 21.75], [20.25, 21.65], [20.5, 21.75], [21.03, 21.53], [21.18, 21.18], [21.53, 21.03], [21.68, 20.68], [21.75, 20.65], [22.0, 20.75], [22.25, 20.65], [22.5, 20.75], [22.75, 20.65], [23.0, 20.75], [23.5, 20.54], [24.0, 20.75], [24.25, 20.65], [24.5, 20.75], [25.03, 20.53], [25.18, 20.18], [25.25, 20.15], [25.5, 20.25], [26.03, 20.03], [26.25, 19.5], [26.15, 19.25], [26.25, 19.0], [26.15, 18.75], [26.25, 18.5], [26.03, 17.97], [25.68, 17.82], [25.53, 17.47], [25.0, 17.25], [24.47, 17.47], [24.32, 17.82], [23.97, 17.97], [23.8, 18.38], [23.68, 18.32], [23.53, 17.97], [23.18, 17.82], [23.03, 17.47], [22.5, 17.25], [22.25, 17.35], [22.0, 17.25], [21.75, 17.35], [21.68, 17.32], [21.53, 16.97], [21.18, 16.82], [21.03, 16.47], [20.68, 16.32], [20.53, 15.97], [20.18, 15.82], [20.03, 15.47], [19.5, 15.25], [19.25, 15.35], [19.0, 15.25], [18.75, 15.35], [18.5, 15.25], [18.0, 15.46], [17.5, 15.25], [16.97, 15.47], [16.82, 15.82], [16.7, 15.88], [16.53, 15.47], [16.0, 15.25], [15.47, 15.47], [15.25, 16.0], [15.35, 16.25], [15.25, 16.5], [15.35, 16.75], [15.32, 16.82], [14.97, 16.97], [14.75, 17.5], [14.85, 17.75], [14.75, 18.0], [14.88, 18.3], [14.75, 18.35], [14.5, 18.25], [13.97, 18.47], [13.75, 19.0], [13.97, 19.53], [14.32, 19.68], [14.47, 20.03], [15.0, 20.25]]]]}, "2021-05-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[9.75, 17.0], [9.97, 17.53], [10.5, 17.75], [10.75, 17.65], [11.0, 17.75], [11.25, 17.65], [11.5, 17.75], [11.75, 17.65], [11.82, 17.68], [11.97, 18.03], [12.32, 18.18], [12.35, 18.25], [12.25, 18.5], [12.35, 18.75], [12.32, 18.82], [11.97, 18.97], [11.75, 19.5], [11.97, 20.03], [12.5, 20.25], [13.03, 20.03], [13.18, 19.68], [13.5, 19.54], [13.82, 19.68], [13.85, 19.75], [13.75, 20.0], [13.85, 20.25], [13.75, 20.5], [13.97, 21.03], [14.5, 21.25], [15.03, 21.03], [15.18, 20.68], [15.25, 20.65], [15.5, 20.75], [15.75, 20.65], [16.0, 20.75], [16.25, 20.65], [16.5, 20.75], [17.03, 20.53], [17.18, 20.18], [17.25, 20.15], [17.32, 20.18], [17.47, 20.53], [18.0, 20.75], [18.3, 20.63], [18.47, 21.03], [19.0, 21.25], [19.25, 21.15], [19.32, 21.18], [19.47, 21.53], [20.0, 21.75], [20.25, 21.65], [20.5, 21.75], [21.03, 21.53], [21.18, 21.18], [21.53, 21.03], [21.68, 20.68], [21.75, 20.65], [22.0, 20.75], [22.25, 20.65], [22.5, 20.75], [22.75, 20.65], [23.0, 20.75], [23.5, 20.54], [24.0, 20.75], [24.25, 20.65], [24.5, 20.75], [25.03, 20.53], [25.18, 20.18], [25.25, 20.15], [25.5, 20.25], [26.03, 20.03], [26.25, 19.5], [26.15, 19.25], [26.25, 19.0], [26.15, 18.75], [26.25, 18.5], [26.03, 17.97], [25.68, 17.82], [25.53, 17.47], [25.0, 17.25], [24.47, 17.47], [24.32, 17.82], [23.97, 17.97], [23.8, 18.38], [23.68, 18.32], [23.53, 17.97], [23.18, 17.82], [23.03, 17.47], [22.5, 17.25], [22.25, 17.35], [22.0, 17.25], [21.75, 17.35], [21.68, 17.32], [21.53, 16.97], [21.18, 16.82], [21.03, 16.47], [20.68, 16.32], [20.53, 15.97], [20.18, 15.82], [20.03, 15.47], [19.5, 15.25], [19.25, 15.35], [19.0, 15.25], [18.75, 15.35], [18.5, 15.25], [18.0, 15.46], [17.5, 15.25], [16.97, 15.47], [16.82, 15.82], [16.75, 15.85], [16.68, 15.82], [16.65, 15.75], [16.75, 15.5], [16.53, 14.97], [16.0, 14.75], [15.75, 14.85], [15.5, 14.75], [15.25, 14.85], [15.0, 14.75], [14.75, 14.85], [14.5, 14.75], [14.25, 14.85], [14.0, 14.75], [13.75, 14.85], [13.5, 14.75], [12.97, 14.97], [12.75, 15.5], [12.96, 16.0], [12.82, 16.32], [12.75, 16.35], [12.5, 16.25], [12.25, 16.35], [12.0, 16.25], [11.75, 16.35], [11.5, 16.25], [11.25, 16.35], [11.0, 16.25], [10.75, 16.35], [10.5, 16.25], [9.97, 16.47], [9.75, 17.0]]], [[[10.47, 19.03], [11.0, 19.25], [11.53, 19.03], [11.75, 18.5], [11.53, 17.97], [11.0, 17.75], [10.47, 17.97], [10.25, 18.5], [10.47, 19.03]]]]}, "2021-05-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[9.75, 17.5], [9.97, 18.03], [10.38, 18.2], [10.25, 18.5], [10.47, 19.03], [10.88, 19.2], [10.75, 19.5], [10.97, 20.03], [11.5, 20.25], [11.75, 20.15], [12.0, 20.25], [12.25, 20.15], [12.5, 20.25], [13.0, 20.04], [13.32, 20.18], [13.47, 20.53], [13.82, 20.68], [13.97, 21.03], [14.5, 21.25], [15.03, 21.03], [15.18, 20.68], [15.25, 20.65], [15.5, 20.75], [15.75, 20.65], [16.0, 20.75], [16.25, 20.65], [16.5, 20.75], [17.03, 20.53], [17.18, 20.18], [17.25, 20.15], [17.32, 20.18], [17.47, 20.53], [18.0, 20.75], [18.3, 20.63], [18.47, 21.03], [19.0, 21.25], [19.25, 21.15], [19.32, 21.18], [19.47, 21.53], [20.0, 21.75], [20.25, 21.65], [20.5, 21.75], [21.03, 21.53], [21.18, 21.18], [21.53, 21.03], [21.68, 20.68], [21.75, 20.65], [22.0, 20.75], [22.25, 20.65], [22.5, 20.75], [22.75, 20.65], [23.0, 20.75], [23.5, 20.54], [24.0, 20.75], [24.25, 20.65], [24.5, 20.75], [25.03, 20.53], [25.18, 20.18], [25.25, 20.15], [25.5, 20.25], [26.03, 20.03], [26.25, 19.5], [26.15, 19.25], [26.25, 19.0], [26.15, 18.75], [26.25, 18.5], [26.03, 17.97], [25.68, 17.82], [25.53, 17.47], [25.0, 17.25], [24.47, 17.47], [24.32, 17.82], [23.97, 17.97], [23.8, 18.38], [23.68, 18.32], [23.53, 17.97], [23.18, 17.82], [23.03, 17.47], [22.5, 17.25], [22.25, 17.35], [22.0, 17.25], [21.75, 17.35], [21.68, 17.32], [21.53, 16.97], [21.18, 16.82], [21.03, 16.47], [20.68, 16.32], [20.53, 15.97], [20.18, 15.82], [20.03, 15.47], [19.5, 15.25], [19.25, 15.35], [19.0, 15.25], [18.75, 15.35], [18.5, 15.25], [18.0, 15.46], [17.5, 15.25], [16.97, 15.47], [16.82, 15.82], [16.75, 15.85], [16.68, 15.82], [16.65, 15.75], [16.75, 15.5], [16.53, 14.97], [16.0, 14.75], [15.75, 14.85], [15.5, 14.75], [15.25, 14.85], [15.0, 14.75], [14.75, 14.85], [14.5, 14.75], [14.25, 14.85], [14.0, 14.75], [13.75, 14.85], [13.5, 14.75], [12.97, 14.97], [12.75, 15.5], [12.85, 15.75], [12.82, 15.82], [12.75, 15.85], [12.5, 15.75], [11.97, 15.97], [11.82, 16.32], [11.75, 16.35], [11.5, 16.25], [11.25, 16.35], [11.18, 16.32], [11.03, 15.97], [10.5, 15.75], [10.25, 15.85], [10.0, 15.75], [9.47, 15.97], [9.25, 16.5], [9.47, 17.03], [9.82, 17.18], [9.85, 17.25], [9.75, 17.5]]]]}, "2021-05-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[9.97, 18.03], [10.38, 18.2], [10.25, 18.5], [10.47, 19.03], [10.88, 19.2], [10.75, 19.5], [10.97, 20.03], [11.5, 20.25], [11.75, 20.15], [12.0, 20.25], [12.25, 20.15], [12.5, 20.25], [13.0, 20.04], [13.32, 20.18], [13.47, 20.53], [13.82, 20.68], [13.97, 21.03], [14.5, 21.25], [15.03, 21.03], [15.18, 20.68], [15.25, 20.65], [15.5, 20.75], [15.75, 20.65], [16.0, 20.75], [16.25, 20.65], [16.5, 20.75], [17.03, 20.53], [17.18, 20.18], [17.25, 20.15], [17.32, 20.18], [17.47, 20.53], [18.0, 20.75], [18.53, 20.53], [18.75, 20.0], [18.65, 19.75], [18.75, 19.5], [18.57, 19.07], [18.82, 19.18], [18.97, 19.53], [19.32, 19.68], [19.47, 20.03], [20.0, 20.25], [20.53, 20.03], [20.75, 19.5], [20.65, 19.25], [20.75, 19.0], [20.53, 18.47], [20.18, 18.32], [20.15, 18.25], [20.25, 18.0], [20.03, 17.47], [19.5, 17.25], [19.25, 17.35], [19.0, 17.25], [18.75, 17.35], [18.5, 17.25], [17.97, 17.47], [17.75, 18.0], [17.53, 17.47], [17.18, 17.32], [17.15, 17.25], [17.25, 17.0], [17.15, 16.75], [17.25, 16.5], [17.03, 15.97], [16.68, 15.82], [16.65, 15.75], [16.75, 15.5], [16.53, 14.97], [16.0, 14.75], [15.75, 14.85], [15.5, 14.75], [15.25, 14.85], [15.0, 14.75], [14.75, 14.85], [14.5, 14.75], [14.25, 14.85], [14.0, 14.75], [13.75, 14.85], [13.5, 14.75], [12.97, 14.97], [12.75, 15.5], [12.85, 15.75], [12.82, 15.82], [12.75, 15.85], [12.5, 15.75], [11.97, 15.97], [11.82, 16.32], [11.75, 16.35], [11.5, 16.25], [11.25, 16.35], [11.18, 16.32], [11.03, 15.97], [10.5, 15.75], [10.25, 15.85], [10.0, 15.75], [9.47, 15.97], [9.25, 16.5], [9.47, 17.03], [9.82, 17.18], [9.85, 17.25], [9.75, 17.5], [9.97, 18.03]], [[17.93, 18.43], [17.68, 18.32], [17.65, 18.25], [17.75, 18.0], [17.93, 18.43]], [[18.07, 18.57], [18.32, 18.68], [18.43, 18.93], [18.18, 18.82], [18.07, 18.57]]], [[[24.25, 18.5], [24.47, 19.03], [25.0, 19.25], [25.25, 19.15], [25.5, 19.25], [26.03, 19.03], [26.25, 18.5], [26.03, 17.97], [25.5, 17.75], [25.25, 17.85], [25.0, 17.75], [24.47, 17.97], [24.25, 18.5]]]]}, "2021-05-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[9.97, 18.03], [10.5, 18.25], [10.75, 18.15], [10.82, 18.18], [10.85, 18.25], [10.75, 18.5], [10.96, 19.0], [10.75, 19.5], [10.97, 20.03], [11.5, 20.25], [11.75, 20.15], [12.0, 20.25], [12.25, 20.15], [12.5, 20.25], [13.0, 20.04], [13.32, 20.18], [13.47, 20.53], [13.82, 20.68], [13.97, 21.03], [14.5, 21.25], [15.03, 21.03], [15.18, 20.68], [15.25, 20.65], [15.5, 20.75], [16.0, 20.54], [16.5, 20.75], [17.03, 20.53], [17.25, 20.0], [17.15, 19.75], [17.25, 19.5], [17.03, 18.97], [16.68, 18.82], [16.65, 18.75], [16.75, 18.5], [16.65, 18.25], [16.75, 18.0], [16.53, 17.47], [16.18, 17.32], [16.03, 16.97], [15.68, 16.82], [15.65, 16.75], [15.75, 16.5], [15.65, 16.25], [15.75, 16.0], [15.53, 15.47], [15.18, 15.32], [15.03, 14.97], [14.5, 14.75], [13.97, 14.97], [13.82, 15.32], [13.75, 15.35], [13.5, 15.25], [12.97, 15.47], [12.82, 15.82], [12.75, 15.85], [12.5, 15.75], [11.97, 15.97], [11.82, 16.32], [11.75, 16.35], [11.5, 16.25], [11.25, 16.35], [11.18, 16.32], [11.03, 15.97], [10.5, 15.75], [10.25, 15.85], [10.0, 15.75], [9.47, 15.97], [9.25, 16.5], [9.47, 17.03], [9.82, 17.18], [9.85, 17.25], [9.75, 17.5], [9.97, 18.03]]], [[[17.47, 20.53], [18.0, 20.75], [18.53, 20.53], [18.75, 20.0], [18.65, 19.75], [18.75, 19.5], [18.53, 18.97], [18.0, 18.75], [17.47, 18.97], [17.25, 19.5], [17.35, 19.75], [17.25, 20.0], [17.47, 20.53]]]]}, "2021-05-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[12.75, 17.5], [12.97, 18.03], [13.32, 18.18], [13.47, 18.53], [14.0, 18.75], [13.75, 18.85], [13.5, 18.75], [12.97, 18.97], [12.75, 19.5], [12.97, 20.03], [13.32, 20.18], [13.47, 20.53], [14.0, 20.75], [14.25, 20.65], [14.5, 20.75], [14.75, 20.65], [15.0, 20.75], [15.25, 20.65], [15.5, 20.75], [16.03, 20.53], [16.18, 20.18], [16.53, 20.03], [16.75, 19.5], [16.65, 19.25], [16.75, 19.0], [16.53, 18.47], [16.18, 18.32], [16.15, 18.25], [16.25, 18.0], [16.03, 17.47], [15.68, 17.32], [15.65, 17.25], [15.75, 17.0], [15.53, 16.47], [15.0, 16.25], [14.75, 16.35], [14.5, 16.25], [14.25, 16.35], [14.0, 16.25], [13.47, 16.47], [13.32, 16.82], [12.97, 16.97], [12.75, 17.5]], [[14.25, 18.65], [14.32, 18.68], [14.38, 18.8], [14.25, 18.85], [14.0, 18.75], [14.25, 18.65]]]]}, "2021-05-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[14.0, 18.75], [14.53, 18.53], [14.75, 18.0], [14.53, 17.47], [14.18, 17.32], [14.03, 16.97], [13.5, 16.75], [12.97, 16.97], [12.75, 17.5], [12.97, 18.03], [13.32, 18.18], [13.47, 18.53], [14.0, 18.75]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.841564453792216}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.869933869726527}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [29.627246868514874, 29.668388386227377, 29.866825760987467, 30.549360238608415, 30.665622442916515, 31.02807094840631, 30.744741901467933]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [24.733990156560083, 25.052723297615728, 26.375802861997897, 27.37437164530519, 29.203315691362775, 30.312462085036145, 30.709755081352114]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.046531931441055, -3.1208460471899344, -2.987872003359153, -2.610931413671346, -2.307550875974838, -2.1083991275011567, -1.822329578827265]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.841564453792216, -4.782735987634851, -3.9432651857754877, -3.4435806690578943, -3.0717434442360627, -2.5314952886255924, -1.8390859728246483]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.8933592243821282, -2.092091479123499, -2.0867887334201405, -1.9399755557224216, -1.7041350457650783, -1.529674012898111, -1.3732028043660478]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.3304083701845535, -2.7407481029303247, -2.9175230044954996, -2.5279002154469357, -2.291518002585822, -1.8047320390132104, -1.393494500182585]}}