{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:21:05.875908", "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": "2020-Aug-27_to_2020-Sep-03_23.5_-11.0"}, "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": 2020080000853}, "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": "August 27 2020"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 03 2020"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 8}, "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": 142730.333401853}, "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": ["Angola", "Congo DRC"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Central-Africa", "W.Southern-Africa"]}, "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": -11.0}, "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": 23.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "23.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 17.75}, "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": -12.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -7.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2020-08-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[22.97, -11.53], [22.75, -11.0], [22.97, -10.47], [23.5, -10.25], [24.03, -10.47], [24.25, -11.0], [24.03, -11.53], [23.5, -11.75], [22.97, -11.53]]], [[[23.97, -9.53], [23.75, -9.0], [23.97, -8.47], [24.5, -8.25], [25.03, -8.47], [25.25, -9.0], [25.07, -9.43], [25.5, -9.25], [26.03, -9.47], [26.25, -10.0], [26.03, -10.53], [25.68, -10.68], [25.53, -11.03], [25.0, -11.25], [24.47, -11.03], [24.25, -10.5], [24.47, -9.97], [24.82, -9.82], [24.93, -9.57], [24.5, -9.75], [23.97, -9.53]]]]}, "2020-08-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[22.97, -11.53], [22.75, -11.0], [22.97, -10.47], [23.5, -10.25], [24.03, -10.47], [24.25, -11.0], [24.03, -11.53], [23.5, -11.75], [22.97, -11.53]]], [[[23.97, -9.53], [23.75, -9.0], [23.97, -8.47], [24.5, -8.25], [25.03, -8.47], [25.25, -9.0], [25.07, -9.43], [25.5, -9.25], [26.03, -9.47], [26.25, -10.0], [26.03, -10.53], [25.68, -10.68], [25.53, -11.03], [25.0, -11.25], [24.47, -11.03], [24.25, -10.5], [24.47, -9.97], [24.82, -9.82], [24.93, -9.57], [24.5, -9.75], [23.97, -9.53]]]]}, "2020-08-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[22.97, -11.53], [22.75, -11.0], [22.97, -10.47], [23.5, -10.25], [24.03, -10.47], [24.25, -11.0], [24.03, -11.53], [23.5, -11.75], [22.97, -11.53]]], [[[23.97, -9.53], [23.75, -9.0], [23.97, -8.47], [24.5, -8.25], [25.03, -8.47], [25.25, -9.0], [25.07, -9.43], [25.5, -9.25], [26.03, -9.47], [26.25, -10.0], [26.03, -10.53], [25.68, -10.68], [25.53, -11.03], [25.0, -11.25], [24.47, -11.03], [24.25, -10.5], [24.47, -9.97], [24.82, -9.82], [24.93, -9.57], [24.5, -9.75], [23.97, -9.53]]]]}, "2020-08-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[17.47, -12.53], [17.25, -12.0], [17.47, -11.47], [18.0, -11.25], [18.53, -11.47], [18.75, -12.0], [18.53, -12.53], [18.0, -12.75], [17.47, -12.53]]], [[[18.97, -9.47], [19.5, -9.25], [20.03, -9.47], [20.25, -10.0], [20.15, -10.25], [20.25, -10.5], [20.47, -9.97], [21.0, -9.75], [21.53, -9.97], [21.75, -10.5], [21.53, -11.03], [21.13, -11.2], [21.25, -11.5], [21.03, -12.03], [20.5, -12.25], [19.97, -12.03], [19.8, -11.62], [19.5, -11.75], [18.97, -11.53], [18.75, -11.0], [18.85, -10.75], [18.75, -10.5], [18.85, -10.25], [18.75, -10.0], [18.97, -9.47]], [[20.15, -10.75], [20.2, -10.87], [20.38, -10.8], [20.25, -10.5], [20.15, -10.75]]], [[[22.85, -9.75], [22.75, -9.5], [22.85, -9.25], [22.75, -9.0], [22.85, -8.75], [22.75, -8.5], [22.85, -8.25], [22.75, -8.0], [22.97, -7.47], [23.5, -7.25], [24.03, -7.47], [24.2, -7.87], [24.5, -7.75], [25.03, -7.97], [25.25, -8.5], [25.15, -8.75], [25.25, -9.0], [25.03, -9.53], [24.68, -9.68], [24.57, -9.93], [25.0, -9.75], [25.53, -9.97], [25.75, -10.5], [25.53, -11.03], [25.18, -11.18], [25.03, -11.53], [24.5, -11.75], [24.0, -11.54], [23.5, -11.75], [23.25, -11.65], [23.0, -11.75], [22.47, -11.53], [22.32, -11.18], [21.97, -11.03], [21.75, -10.5], [21.97, -9.97], [22.5, -9.75], [22.8, -9.87], [22.85, -9.75]]]]}, "2020-08-31T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[17.47, -11.47], [17.82, -11.32], [17.97, -10.97], [18.32, -10.82], [18.47, -10.47], [18.82, -10.32], [18.85, -10.25], [18.75, -10.0], [18.97, -9.47], [19.5, -9.25], [20.0, -9.46], [20.5, -9.25], [21.03, -9.47], [21.18, -9.82], [21.25, -9.85], [21.5, -9.75], [22.0, -9.96], [22.5, -9.75], [22.8, -9.87], [22.85, -9.75], [22.75, -9.5], [22.85, -9.25], [22.75, -9.0], [22.85, -8.75], [22.75, -8.5], [22.85, -8.25], [22.75, -8.0], [22.97, -7.47], [23.5, -7.25], [24.03, -7.47], [24.2, -7.87], [24.5, -7.75], [25.03, -7.97], [25.25, -8.5], [25.15, -8.75], [25.25, -9.0], [25.03, -9.53], [24.68, -9.68], [24.57, -9.93], [25.0, -9.75], [25.53, -9.97], [25.75, -10.5], [25.53, -11.03], [25.18, -11.18], [25.03, -11.53], [24.5, -11.75], [24.0, -11.54], [23.5, -11.75], [23.25, -11.65], [23.0, -11.75], [22.75, -11.65], [22.68, -11.68], [22.53, -12.03], [22.18, -12.18], [22.03, -12.53], [21.5, -12.75], [21.25, -12.65], [21.0, -12.75], [20.75, -12.65], [20.5, -12.75], [20.25, -12.65], [20.0, -12.75], [19.75, -12.65], [19.5, -12.75], [18.97, -12.53], [18.82, -12.18], [18.75, -12.15], [18.68, -12.18], [18.65, -12.25], [18.75, -12.5], [18.53, -13.03], [18.0, -13.25], [17.47, -13.03], [17.25, -12.5], [17.35, -12.25], [17.25, -12.0], [17.47, -11.47]]]]}, "2020-09-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[17.47, -11.47], [17.82, -11.32], [17.97, -10.97], [18.32, -10.82], [18.47, -10.47], [18.82, -10.32], [18.85, -10.25], [18.75, -10.0], [18.97, -9.47], [19.5, -9.25], [20.0, -9.46], [20.5, -9.25], [21.03, -9.47], [21.18, -9.82], [21.25, -9.85], [21.5, -9.75], [22.0, -9.96], [22.5, -9.75], [22.8, -9.87], [22.85, -9.75], [22.75, -9.5], [22.85, -9.25], [22.75, -9.0], [22.85, -8.75], [22.75, -8.5], [22.85, -8.25], [22.75, -8.0], [22.97, -7.47], [23.5, -7.25], [24.03, -7.47], [24.2, -7.87], [24.5, -7.75], [25.03, -7.97], [25.25, -8.5], [25.15, -8.75], [25.25, -9.0], [25.03, -9.53], [24.68, -9.68], [24.57, -9.93], [25.0, -9.75], [25.53, -9.97], [25.75, -10.5], [25.53, -11.03], [25.18, -11.18], [25.03, -11.53], [24.5, -11.75], [24.0, -11.54], [23.5, -11.75], [23.25, -11.65], [23.0, -11.75], [22.75, -11.65], [22.68, -11.68], [22.53, -12.03], [22.18, -12.18], [22.03, -12.53], [21.5, -12.75], [21.25, -12.65], [21.0, -12.75], [20.75, -12.65], [20.5, -12.75], [20.25, -12.65], [20.0, -12.75], [19.75, -12.65], [19.5, -12.75], [18.97, -12.53], [18.82, -12.18], [18.75, -12.15], [18.68, -12.18], [18.65, -12.25], [18.75, -12.5], [18.53, -13.03], [18.0, -13.25], [17.47, -13.03], [17.25, -12.5], [17.35, -12.25], [17.25, -12.0], [17.47, -11.47]]]]}, "2020-09-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[17.97, -10.97], [18.32, -10.82], [18.47, -10.47], [18.82, -10.32], [18.97, -9.97], [19.5, -9.75], [19.75, -9.85], [19.82, -9.82], [19.97, -9.47], [20.5, -9.25], [21.03, -9.47], [21.18, -9.82], [21.25, -9.85], [21.5, -9.75], [22.0, -9.96], [22.5, -9.75], [23.0, -9.96], [23.5, -9.75], [23.75, -9.85], [24.0, -9.75], [24.53, -9.97], [24.75, -10.5], [24.53, -11.03], [24.0, -11.25], [23.75, -11.15], [23.5, -11.25], [23.2, -11.12], [23.03, -11.53], [22.68, -11.68], [22.53, -12.03], [22.18, -12.18], [22.03, -12.53], [21.5, -12.75], [21.25, -12.65], [21.0, -12.75], [20.75, -12.65], [20.5, -12.75], [20.25, -12.65], [20.0, -12.75], [19.75, -12.65], [19.5, -12.75], [18.97, -12.53], [18.82, -12.18], [18.75, -12.15], [18.63, -12.2], [18.75, -12.5], [18.53, -13.03], [18.0, -13.25], [17.47, -13.03], [17.25, -12.5], [17.47, -11.97], [17.88, -11.8], [17.75, -11.5], [17.97, -10.97]]]]}, "2020-09-03T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[18.0, -11.75], [18.53, -11.97], [18.75, -12.5], [18.53, -13.03], [18.0, -13.25], [17.47, -13.03], [17.25, -12.5], [17.47, -11.97], [18.0, -11.75]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -5.237623850373552}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.4242689705007887}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [22.576058675846014, 21.826730809577896, 23.203190561932672, 23.05797329658168, 21.084665934638622, 22.360113412882356, 22.377657868201425, 22.222414482602233]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [21.509551377542607, 20.83514387329734, 22.78713198985895, 21.72615364032839, 18.681131695957617, 20.17522691936807, 20.949574935908686, 22.222414482602233]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.1556633828364227, -2.942242261609948, -1.5941729158350455, -1.6648058213443966, -3.3981831259592292, -2.1481299875052273, -2.029228472107401, -1.603969173727819]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.0977738802989165, -3.767726176188148, -1.8513427331489538, -2.100516296569083, -5.237623850373552, -3.113409552754206, -2.5702070927969203, -1.603969173727819]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-2.228904896594309, -2.98719949393263, -1.6026030077733486, -1.598289576226064, -3.273784527830914, -2.0514379847774196, -1.9662932860113604, -1.4996370552575073]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-3.1974781241042667, -3.658071551682202, -1.7845785910235397, -1.9963248265843752, -4.942085961968025, -2.8742583741602057, -2.5633273595645845, -1.4996370552575073]}}