{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:33:35.269156", "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": "2022-Dec-29_to_2023-Jan-02_27.5_-26.5"}, "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": 2022120001236}, "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 29 2022"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 02 2023"}, "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": 225322.1570550813}, "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", "South Africa"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Southern-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": -26.5}, "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": 27.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "27.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 23.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 30.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -28.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -23.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2022-12-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[24.75, -26.0], [24.97, -25.47], [25.5, -25.25], [25.75, -25.35], [26.0, -25.25], [26.25, -25.35], [26.5, -25.25], [26.75, -25.35], [27.0, -25.25], [27.25, -25.35], [27.5, -25.25], [28.03, -25.47], [28.18, -25.82], [28.53, -25.97], [28.75, -26.5], [28.65, -26.75], [28.75, -27.0], [28.53, -27.53], [28.18, -27.68], [28.03, -28.03], [27.5, -28.25], [27.25, -28.15], [27.18, -28.18], [27.03, -28.53], [26.5, -28.75], [25.97, -28.53], [25.82, -28.18], [25.75, -28.15], [25.5, -28.25], [25.25, -28.15], [25.0, -28.25], [24.47, -28.03], [24.25, -27.5], [24.47, -26.97], [24.82, -26.82], [24.96, -26.5], [24.75, -26.0]]]]}, "2022-12-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[23.75, -24.0], [23.97, -23.47], [24.5, -23.25], [24.75, -23.35], [25.0, -23.25], [25.53, -23.47], [25.68, -23.82], [25.75, -23.85], [26.0, -23.75], [26.25, -23.85], [26.5, -23.75], [26.75, -23.85], [27.0, -23.75], [27.25, -23.85], [27.5, -23.75], [27.75, -23.85], [28.0, -23.75], [28.25, -23.85], [28.5, -23.75], [28.75, -23.85], [28.82, -23.82], [28.97, -23.47], [29.5, -23.25], [29.75, -23.35], [30.0, -23.25], [30.53, -23.47], [30.68, -23.82], [31.03, -23.97], [31.25, -24.5], [31.15, -24.75], [31.25, -25.0], [31.03, -25.53], [30.68, -25.68], [30.65, -25.75], [30.75, -26.0], [30.53, -26.53], [30.18, -26.68], [30.03, -27.03], [29.68, -27.18], [29.65, -27.25], [29.75, -27.5], [29.65, -27.75], [29.75, -28.0], [29.53, -28.53], [29.0, -28.75], [28.75, -28.65], [28.5, -28.75], [28.25, -28.65], [28.0, -28.75], [27.47, -28.53], [27.32, -28.18], [27.25, -28.15], [27.18, -28.18], [27.03, -28.53], [26.5, -28.75], [25.97, -28.53], [25.82, -28.18], [25.75, -28.15], [25.5, -28.25], [25.25, -28.15], [25.0, -28.25], [24.47, -28.03], [24.25, -27.5], [24.47, -26.97], [24.82, -26.82], [24.96, -26.5], [24.82, -26.18], [24.47, -26.03], [24.32, -25.68], [24.25, -25.65], [24.0, -25.75], [23.47, -25.53], [23.25, -25.0], [23.47, -24.47], [23.82, -24.32], [23.85, -24.25], [23.75, -24.0]]]]}, "2022-12-31T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[23.75, -24.0], [23.97, -23.47], [24.5, -23.25], [24.75, -23.35], [25.0, -23.25], [25.53, -23.47], [25.68, -23.82], [25.75, -23.85], [26.0, -23.75], [26.25, -23.85], [26.32, -23.82], [26.47, -23.47], [27.0, -23.25], [27.53, -23.47], [27.68, -23.82], [27.75, -23.85], [28.0, -23.75], [28.25, -23.85], [28.5, -23.75], [28.75, -23.85], [28.82, -23.82], [28.97, -23.47], [29.5, -23.25], [29.75, -23.35], [30.0, -23.25], [30.53, -23.47], [30.68, -23.82], [31.03, -23.97], [31.25, -24.5], [31.15, -24.75], [31.25, -25.0], [31.03, -25.53], [30.68, -25.68], [30.65, -25.75], [30.75, -26.0], [30.53, -26.53], [30.18, -26.68], [30.03, -27.03], [29.68, -27.18], [29.65, -27.25], [29.75, -27.5], [29.65, -27.75], [29.75, -28.0], [29.53, -28.53], [29.0, -28.75], [28.75, -28.65], [28.5, -28.75], [28.25, -28.65], [28.0, -28.75], [27.47, -28.53], [27.32, -28.18], [27.25, -28.15], [27.18, -28.18], [27.03, -28.53], [26.5, -28.75], [25.97, -28.53], [25.82, -28.18], [25.75, -28.15], [25.5, -28.25], [25.25, -28.15], [25.0, -28.25], [24.47, -28.03], [24.25, -27.5], [24.47, -26.97], [24.82, -26.82], [24.96, -26.5], [24.82, -26.18], [24.47, -26.03], [24.32, -25.68], [24.25, -25.65], [24.0, -25.75], [23.47, -25.53], [23.25, -25.0], [23.47, -24.47], [23.82, -24.32], [23.85, -24.25], [23.75, -24.0]]]]}, "2023-01-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[23.75, -24.0], [23.97, -23.47], [24.5, -23.25], [24.75, -23.35], [25.0, -23.25], [25.53, -23.47], [25.68, -23.82], [25.75, -23.85], [26.0, -23.75], [26.25, -23.85], [26.32, -23.82], [26.47, -23.47], [27.0, -23.25], [27.53, -23.47], [27.68, -23.82], [27.75, -23.85], [28.0, -23.75], [28.25, -23.85], [28.5, -23.75], [28.75, -23.85], [28.82, -23.82], [28.97, -23.47], [29.5, -23.25], [29.75, -23.35], [30.0, -23.25], [30.53, -23.47], [30.68, -23.82], [31.03, -23.97], [31.25, -24.5], [31.15, -24.75], [31.25, -25.0], [31.03, -25.53], [30.68, -25.68], [30.65, -25.75], [30.75, -26.0], [30.53, -26.53], [30.18, -26.68], [30.03, -27.03], [29.68, -27.18], [29.65, -27.25], [29.75, -27.5], [29.65, -27.75], [29.75, -28.0], [29.53, -28.53], [29.0, -28.75], [28.75, -28.65], [28.5, -28.75], [28.25, -28.65], [28.0, -28.75], [27.47, -28.53], [27.32, -28.18], [27.25, -28.15], [27.0, -28.25], [26.75, -28.15], [26.5, -28.25], [26.25, -28.15], [26.0, -28.25], [25.75, -28.15], [25.5, -28.25], [25.25, -28.15], [25.0, -28.25], [24.47, -28.03], [24.25, -27.5], [24.47, -26.97], [24.82, -26.82], [24.96, -26.5], [24.82, -26.18], [24.47, -26.03], [24.32, -25.68], [24.25, -25.65], [24.0, -25.75], [23.47, -25.53], [23.25, -25.0], [23.47, -24.47], [23.82, -24.32], [23.85, -24.25], [23.75, -24.0]]]]}, "2023-01-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[27.97, -28.03], [27.75, -27.5], [27.97, -26.97], [28.5, -26.75], [29.03, -26.97], [29.25, -27.5], [29.03, -28.03], [28.5, -28.25], [27.97, -28.03]]], [[[27.0, -23.25], [27.53, -23.47], [27.68, -23.82], [27.75, -23.85], [28.0, -23.75], [28.53, -23.97], [28.75, -24.5], [28.53, -25.03], [28.0, -25.25], [27.75, -25.15], [27.5, -25.25], [27.25, -25.15], [27.0, -25.25], [26.47, -25.03], [26.25, -24.5], [26.35, -24.25], [26.25, -24.0], [26.47, -23.47], [27.0, -23.25]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -6.631107244718692}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.088908000704142}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [19.265823572968657, 18.913521056756622, 18.258647636271462, 18.79980909072526, 21.22329737986081]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [17.720213853196526, 12.940452050929139, 14.512277514749314, 15.292949985059465, 17.610685355750263]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.2953132644374326, -3.852353638098497, -4.601990883551702, -4.101478869263147, -3.011236990146608]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.09421558679702, -6.185551740016706, -6.631107244718692, -5.295694949253232, -3.418541931158927]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5443825777601234, -1.8896280446932479, -2.232485174321642, -1.9680532951284782, -1.406770479476199]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.9139875264665884, -2.9840263120959456, -2.879671323859269, -2.7451465241883555, -1.5107995086053227]}}