{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 09:07:38.225059", "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": "2017-Apr-13_to_2017-Apr-17_21.5_-30.0"}, "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": 2017040000395}, "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 13 2017"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 17 2017"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 5}, "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": 207976.39197595202}, "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": ["Botswana", "Namibia", "South Africa"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["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": -30.0}, "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": 21.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "21.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 19.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 24.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -33.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -24.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2017-04-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[18.75, -33.0], [18.97, -32.47], [19.5, -32.25], [19.75, -32.35], [19.82, -32.32], [19.85, -32.25], [19.82, -32.18], [19.47, -32.03], [19.25, -31.5], [19.35, -31.25], [19.25, -31.0], [19.35, -30.75], [19.25, -30.5], [19.35, -30.25], [19.25, -30.0], [19.35, -29.75], [19.25, -29.5], [19.35, -29.25], [19.25, -29.0], [19.35, -28.75], [19.25, -28.5], [19.35, -28.25], [19.32, -28.18], [18.97, -28.03], [18.75, -27.5], [18.97, -26.97], [19.32, -26.82], [19.47, -26.47], [20.0, -26.25], [20.53, -26.47], [20.68, -26.82], [21.03, -26.97], [21.25, -27.5], [21.15, -27.75], [21.25, -28.0], [21.04, -28.5], [21.18, -28.82], [21.53, -28.97], [21.68, -29.32], [22.03, -29.47], [22.25, -30.0], [22.15, -30.25], [22.18, -30.32], [22.53, -30.47], [22.75, -31.0], [22.65, -31.25], [22.75, -31.5], [22.53, -32.03], [22.18, -32.18], [22.03, -32.53], [21.68, -32.68], [21.65, -32.75], [21.75, -33.0], [21.53, -33.53], [21.18, -33.68], [21.03, -34.03], [20.5, -34.25], [20.25, -34.15], [20.0, -34.25], [19.47, -34.03], [19.32, -33.68], [18.97, -33.53], [18.75, -33.0]]]]}, "2017-04-14T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[18.75, -33.0], [18.97, -32.47], [19.5, -32.25], [19.75, -32.35], [19.82, -32.32], [19.85, -32.25], [19.82, -32.18], [19.47, -32.03], [19.25, -31.5], [19.35, -31.25], [19.25, -31.0], [19.35, -30.75], [19.25, -30.5], [19.35, -30.25], [19.25, -30.0], [19.35, -29.75], [19.25, -29.5], [19.35, -29.25], [19.25, -29.0], [19.35, -28.75], [19.25, -28.5], [19.35, -28.25], [19.32, -28.18], [18.97, -28.03], [18.75, -27.5], [18.97, -26.97], [19.32, -26.82], [19.47, -26.47], [19.82, -26.32], [19.97, -25.97], [20.38, -25.8], [20.25, -25.5], [20.47, -24.97], [20.82, -24.82], [20.97, -24.47], [21.5, -24.25], [22.03, -24.47], [22.18, -24.82], [22.25, -24.85], [22.5, -24.75], [23.03, -24.97], [23.25, -25.5], [23.15, -25.75], [23.25, -26.0], [23.15, -26.25], [23.25, -26.5], [23.15, -26.75], [23.25, -27.0], [23.15, -27.25], [23.18, -27.32], [23.25, -27.35], [23.5, -27.25], [24.03, -27.47], [24.18, -27.82], [24.53, -27.97], [24.75, -28.5], [24.65, -28.75], [24.75, -29.0], [24.53, -29.53], [24.0, -29.75], [23.75, -29.65], [23.5, -29.75], [23.25, -29.65], [23.0, -29.75], [22.57, -29.57], [22.75, -30.0], [22.54, -30.5], [22.75, -31.0], [22.65, -31.25], [22.75, -31.5], [22.53, -32.03], [22.18, -32.18], [22.03, -32.53], [21.68, -32.68], [21.65, -32.75], [21.75, -33.0], [21.53, -33.53], [21.18, -33.68], [21.03, -34.03], [20.5, -34.25], [20.25, -34.15], [20.0, -34.25], [19.47, -34.03], [19.32, -33.68], [18.97, -33.53], [18.75, -33.0]], [[21.82, -28.68], [21.7, -28.62], [21.54, -29.0], [21.68, -29.32], [21.75, -29.35], [22.0, -29.25], [22.43, -29.43], [22.32, -29.18], [21.97, -29.03], [21.82, -28.68]]]]}, "2017-04-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[18.75, -33.0], [18.97, -32.47], [19.5, -32.25], [19.75, -32.35], [19.82, -32.32], [19.85, -32.25], [19.82, -32.18], [19.47, -32.03], [19.25, -31.5], [19.35, -31.25], [19.25, -31.0], [19.35, -30.75], [19.25, -30.5], [19.35, -30.25], [19.25, -30.0], [19.35, -29.75], [19.25, -29.5], [19.35, -29.25], [19.25, -29.0], [19.35, -28.75], [19.25, -28.5], [19.35, -28.25], [19.32, -28.18], [18.97, -28.03], [18.75, -27.5], [18.97, -26.97], [19.32, -26.82], [19.47, -26.47], [19.82, -26.32], [19.97, -25.97], [20.38, -25.8], [20.25, -25.5], [20.47, -24.97], [20.82, -24.82], [20.97, -24.47], [21.5, -24.25], [21.75, -24.35], [22.0, -24.25], [22.53, -24.47], [22.68, -24.82], [23.03, -24.97], [23.25, -25.5], [23.15, -25.75], [23.18, -25.82], [23.53, -25.97], [23.75, -26.5], [23.65, -26.75], [23.7, -26.87], [24.0, -26.75], [24.53, -26.97], [24.75, -27.5], [24.54, -28.0], [24.75, -28.5], [24.65, -28.75], [24.75, -29.0], [24.53, -29.53], [24.0, -29.75], [23.75, -29.65], [23.5, -29.75], [23.25, -29.65], [23.0, -29.75], [22.57, -29.57], [22.75, -30.0], [22.54, -30.5], [22.75, -31.0], [22.65, -31.25], [22.75, -31.5], [22.53, -32.03], [22.18, -32.18], [22.03, -32.53], [21.68, -32.68], [21.65, -32.75], [21.75, -33.0], [21.53, -33.53], [21.18, -33.68], [21.03, -34.03], [20.5, -34.25], [20.25, -34.15], [20.0, -34.25], [19.47, -34.03], [19.32, -33.68], [18.97, -33.53], [18.75, -33.0]], [[21.82, -28.68], [21.7, -28.62], [21.54, -29.0], [21.68, -29.32], [21.75, -29.35], [22.0, -29.25], [22.43, -29.43], [22.32, -29.18], [21.97, -29.03], [21.82, -28.68]]]]}, "2017-04-16T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[19.97, -25.97], [20.38, -25.8], [20.25, -25.5], [20.47, -24.97], [20.82, -24.82], [20.97, -24.47], [21.5, -24.25], [21.75, -24.35], [22.0, -24.25], [22.53, -24.47], [22.68, -24.82], [23.03, -24.97], [23.25, -25.5], [23.15, -25.75], [23.18, -25.82], [23.53, -25.97], [23.75, -26.5], [23.65, -26.75], [23.7, -26.87], [24.0, -26.75], [24.53, -26.97], [24.75, -27.5], [24.54, -28.0], [24.75, -28.5], [24.65, -28.75], [24.75, -29.0], [24.53, -29.53], [24.0, -29.75], [23.75, -29.65], [23.5, -29.75], [23.25, -29.65], [23.0, -29.75], [22.57, -29.57], [22.75, -30.0], [22.53, -30.53], [22.0, -30.75], [21.75, -30.65], [21.5, -30.75], [20.97, -30.53], [20.75, -30.0], [20.97, -29.47], [21.5, -29.25], [21.75, -29.35], [22.0, -29.25], [22.43, -29.43], [22.32, -29.18], [21.97, -29.03], [21.82, -28.68], [21.7, -28.62], [21.53, -29.03], [21.0, -29.25], [20.47, -29.03], [20.25, -28.5], [20.35, -28.25], [20.32, -28.18], [19.97, -28.03], [19.75, -27.5], [19.96, -27.0], [19.75, -26.5], [19.97, -25.97]]]]}, "2017-04-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[20.75, -26.0], [20.97, -25.47], [21.38, -25.3], [21.25, -25.0], [21.47, -24.47], [22.0, -24.25], [22.53, -24.47], [22.75, -25.0], [22.54, -25.5], [22.68, -25.82], [22.75, -25.85], [23.0, -25.75], [23.53, -25.97], [23.75, -26.5], [23.65, -26.75], [23.7, -26.87], [24.0, -26.75], [24.53, -26.97], [24.75, -27.5], [24.53, -28.03], [24.0, -28.25], [23.47, -28.03], [23.3, -27.62], [23.0, -27.75], [22.75, -27.65], [22.5, -27.75], [22.25, -27.65], [22.0, -27.75], [21.47, -27.53], [21.25, -27.0], [21.38, -26.7], [20.97, -26.53], [20.75, -26.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -9.544598851499757}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.528179731951845}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [12.809312596837913, 13.170178735836771, 13.931744085568994, 16.27261826032793, 17.319033683047905]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [8.70601133018124, 5.499585881316534, 7.444130830286156, 12.00852427367522, 14.155612796578964]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-6.241510073931675, -6.347679904221865, -5.4878813927479095, -3.8370792110712886, -3.1164836558717752]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-8.242361659231335, -9.544598851499757, -7.6767049869934, -4.888735263244371, -3.859446072163337]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.7867937491710084, -2.0470738974793856, -1.86456754348025, -1.524988376259224, -1.2764364641458732]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.1765613491346647, -2.6225650700921657, -2.719251875791541, -2.009725627765432, -1.4943220141686309]}}