{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:16:21.041667", "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-Dec-25_to_2021-Dec-28_16.0_-24.0"}, "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": 2021120000938}, "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": "December 25 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 28 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": 61665.72557790206}, "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": ["Namibia"]}, "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": -24.0}, "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": 16.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "16.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 16.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 17.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -27.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -23.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[15.46, -23.5], [15.25, -23.0], [15.47, -22.47], [16.0, -22.25], [16.25, -22.35], [16.5, -22.25], [17.03, -22.47], [17.18, -22.82], [17.53, -22.97], [17.75, -23.5], [17.65, -23.75], [17.75, -24.0], [17.65, -24.25], [17.75, -24.5], [17.65, -24.75], [17.75, -25.0], [17.65, -25.25], [17.75, -25.5], [17.65, -25.75], [17.75, -26.0], [17.53, -26.53], [17.18, -26.68], [17.15, -26.75], [17.25, -27.0], [17.03, -27.53], [16.5, -27.75], [15.97, -27.53], [15.82, -27.18], [15.47, -27.03], [15.25, -26.5], [15.35, -26.25], [15.25, -26.0], [15.35, -25.75], [15.25, -25.5], [15.35, -25.25], [15.25, -25.0], [15.35, -24.75], [15.25, -24.5], [15.35, -24.25], [15.25, -24.0], [15.46, -23.5]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.Southern-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-12-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[15.25, -24.5], [15.35, -24.25], [15.25, -24.0], [15.47, -23.47], [16.0, -23.25], [16.53, -23.47], [16.75, -24.0], [16.65, -24.25], [16.75, -24.5], [16.65, -24.75], [16.75, -25.0], [16.63, -25.3], [17.03, -25.47], [17.25, -26.0], [17.03, -26.53], [16.68, -26.68], [16.53, -27.03], [16.0, -27.25], [15.47, -27.03], [15.25, -26.5], [15.47, -25.97], [15.82, -25.82], [15.88, -25.7], [15.47, -25.53], [15.25, -25.0], [15.35, -24.75], [15.25, -24.5]]]]}, "2021-12-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[15.25, -26.0], [15.35, -25.75], [15.25, -25.5], [15.35, -25.25], [15.25, -25.0], [15.35, -24.75], [15.25, -24.5], [15.35, -24.25], [15.25, -24.0], [15.46, -23.5], [15.25, -23.0], [15.47, -22.47], [16.0, -22.25], [16.25, -22.35], [16.5, -22.25], [17.03, -22.47], [17.18, -22.82], [17.53, -22.97], [17.75, -23.5], [17.65, -23.75], [17.75, -24.0], [17.65, -24.25], [17.75, -24.5], [17.65, -24.75], [17.75, -25.0], [17.65, -25.25], [17.75, -25.5], [17.65, -25.75], [17.75, -26.0], [17.53, -26.53], [17.18, -26.68], [17.15, -26.75], [17.25, -27.0], [17.03, -27.53], [16.5, -27.75], [15.97, -27.53], [15.82, -27.18], [15.47, -27.03], [15.25, -26.5], [15.35, -26.25], [15.25, -26.0]]]]}, "2021-12-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[15.25, -26.0], [15.35, -25.75], [15.25, -25.5], [15.35, -25.25], [15.25, -25.0], [15.35, -24.75], [15.25, -24.5], [15.35, -24.25], [15.25, -24.0], [15.46, -23.5], [15.25, -23.0], [15.47, -22.47], [16.0, -22.25], [16.25, -22.35], [16.5, -22.25], [17.03, -22.47], [17.18, -22.82], [17.53, -22.97], [17.75, -23.5], [17.65, -23.75], [17.75, -24.0], [17.65, -24.25], [17.75, -24.5], [17.65, -24.75], [17.75, -25.0], [17.65, -25.25], [17.75, -25.5], [17.65, -25.75], [17.75, -26.0], [17.53, -26.53], [17.18, -26.68], [17.15, -26.75], [17.25, -27.0], [17.03, -27.53], [16.5, -27.75], [15.97, -27.53], [15.82, -27.18], [15.47, -27.03], [15.25, -26.5], [15.35, -26.25], [15.25, -26.0]]]]}, "2021-12-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[15.25, -26.0], [15.35, -25.75], [15.25, -25.5], [15.35, -25.25], [15.25, -25.0], [15.35, -24.75], [15.25, -24.5], [15.35, -24.25], [15.25, -24.0], [15.46, -23.5], [15.25, -23.0], [15.47, -22.47], [16.0, -22.25], [16.25, -22.35], [16.5, -22.25], [17.03, -22.47], [17.18, -22.82], [17.53, -22.97], [17.75, -23.5], [17.65, -23.75], [17.75, -24.0], [17.65, -24.25], [17.75, -24.5], [17.65, -24.75], [17.75, -25.0], [17.65, -25.25], [17.75, -25.5], [17.65, -25.75], [17.75, -26.0], [17.53, -26.53], [17.18, -26.68], [17.15, -26.75], [17.25, -27.0], [17.03, -27.53], [16.5, -27.75], [15.97, -27.53], [15.82, -27.18], [15.47, -27.03], [15.25, -26.5], [15.35, -26.25], [15.25, -26.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -6.519365723601425}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.395241438381132}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [20.877589611700614, 20.483239609401323, 19.087746928917625, 20.875686175007615]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [19.51694951342307, 18.010952610232437, 16.564132161367695, 18.065608172380678]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.471298526482849, -4.042696807387878, -5.535644220438784, -3.8173703127481606]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.84498173593704, -5.263854493912049, -6.519365723601425, -4.3742194136382295]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4512370762378326, -1.7666290127805235, -2.371467879892616, -1.5856455044721323]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5656656775424047, -2.207903894109426, -2.7562983422741762, -1.7509253750204845]}}