{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:02:27.620962", "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": "2024-Dec-19_to_2024-Dec-24_25.5_-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": 2024120000486}, "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 19 2024"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 24 2024"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 6}, "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": 76207.4327147615}, "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"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Africa", "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": 25.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "25.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 22.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 27.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -25.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -22.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[22.53, -21.97], [22.75, -22.5], [22.65, -22.75], [22.68, -22.82], [23.03, -22.97], [23.18, -23.32], [23.25, -23.35], [23.5, -23.25], [23.75, -23.35], [23.82, -23.32], [23.97, -22.97], [24.5, -22.75], [25.03, -22.97], [25.18, -23.32], [25.25, -23.35], [25.32, -23.32], [25.47, -22.97], [26.0, -22.75], [26.25, -22.85], [26.5, -22.75], [27.03, -22.97], [27.18, -23.32], [27.53, -23.47], [27.75, -24.0], [27.65, -24.25], [27.75, -24.5], [27.53, -25.03], [27.18, -25.18], [27.03, -25.53], [26.5, -25.75], [25.97, -25.53], [25.82, -25.18], [25.75, -25.15], [25.5, -25.25], [25.25, -25.15], [25.0, -25.25], [24.75, -25.15], [24.5, -25.25], [24.25, -25.15], [24.0, -25.25], [23.75, -25.15], [23.5, -25.25], [23.25, -25.15], [23.0, -25.25], [22.75, -25.15], [22.5, -25.25], [21.97, -25.03], [21.75, -24.5], [21.85, -24.25], [21.75, -24.0], [21.85, -23.75], [21.82, -23.68], [21.47, -23.53], [21.25, -23.0], [21.35, -22.75], [21.25, -22.5], [21.47, -21.97], [22.0, -21.75], [22.53, -21.97]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.Southern-Africa", "E.Southern-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2024-12-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[25.0, -24.75], [24.47, -24.53], [24.25, -24.0], [24.47, -23.47], [25.0, -23.25], [25.25, -23.35], [25.32, -23.32], [25.47, -22.97], [26.0, -22.75], [26.25, -22.85], [26.5, -22.75], [27.03, -22.97], [27.18, -23.32], [27.53, -23.47], [27.75, -24.0], [27.53, -24.53], [27.0, -24.75], [26.75, -24.65], [26.5, -24.75], [26.25, -24.65], [26.0, -24.75], [25.75, -24.65], [25.5, -24.75], [25.25, -24.65], [25.0, -24.75]]]]}, "2024-12-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[23.97, -24.03], [23.75, -23.5], [23.97, -22.97], [24.5, -22.75], [25.03, -22.97], [25.18, -23.32], [25.25, -23.35], [25.32, -23.32], [25.47, -22.97], [26.0, -22.75], [26.25, -22.85], [26.5, -22.75], [27.03, -22.97], [27.18, -23.32], [27.53, -23.47], [27.75, -24.0], [27.53, -24.53], [27.0, -24.75], [26.75, -24.65], [26.5, -24.75], [26.25, -24.65], [26.0, -24.75], [25.75, -24.65], [25.5, -24.75], [25.25, -24.65], [25.0, -24.75], [24.47, -24.53], [24.32, -24.18], [23.97, -24.03]]]]}, "2024-12-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[21.25, -22.5], [21.47, -21.97], [22.0, -21.75], [22.53, -21.97], [22.75, -22.5], [22.65, -22.75], [22.68, -22.82], [23.03, -22.97], [23.18, -23.32], [23.25, -23.35], [23.5, -23.25], [23.75, -23.35], [23.82, -23.32], [23.97, -22.97], [24.5, -22.75], [25.03, -22.97], [25.18, -23.32], [25.25, -23.35], [25.32, -23.32], [25.47, -22.97], [26.0, -22.75], [26.25, -22.85], [26.5, -22.75], [27.03, -22.97], [27.18, -23.32], [27.53, -23.47], [27.75, -24.0], [27.65, -24.25], [27.75, -24.5], [27.53, -25.03], [27.18, -25.18], [27.03, -25.53], [26.5, -25.75], [25.97, -25.53], [25.82, -25.18], [25.75, -25.15], [25.5, -25.25], [25.25, -25.15], [25.0, -25.25], [24.75, -25.15], [24.5, -25.25], [24.25, -25.15], [24.0, -25.25], [23.75, -25.15], [23.5, -25.25], [23.25, -25.15], [23.0, -25.25], [22.75, -25.15], [22.5, -25.25], [21.97, -25.03], [21.75, -24.5], [21.85, -24.25], [21.75, -24.0], [21.85, -23.75], [21.82, -23.68], [21.47, -23.53], [21.25, -23.0], [21.35, -22.75], [21.25, -22.5]]]]}, "2024-12-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[21.25, -22.5], [21.47, -21.97], [22.0, -21.75], [22.53, -21.97], [22.75, -22.5], [22.65, -22.75], [22.68, -22.82], [23.03, -22.97], [23.18, -23.32], [23.25, -23.35], [23.5, -23.25], [23.75, -23.35], [23.82, -23.32], [23.97, -22.97], [24.5, -22.75], [25.03, -22.97], [25.18, -23.32], [25.25, -23.35], [25.5, -23.25], [25.75, -23.35], [26.0, -23.25], [26.53, -23.47], [26.68, -23.82], [26.75, -23.85], [27.0, -23.75], [27.53, -23.97], [27.75, -24.5], [27.53, -25.03], [27.18, -25.18], [27.03, -25.53], [26.5, -25.75], [25.97, -25.53], [25.82, -25.18], [25.75, -25.15], [25.5, -25.25], [25.25, -25.15], [25.0, -25.25], [24.75, -25.15], [24.5, -25.25], [24.25, -25.15], [24.0, -25.25], [23.75, -25.15], [23.5, -25.25], [23.25, -25.15], [23.0, -25.25], [22.75, -25.15], [22.5, -25.25], [21.97, -25.03], [21.75, -24.5], [21.85, -24.25], [21.75, -24.0], [21.85, -23.75], [21.82, -23.68], [21.47, -23.53], [21.25, -23.0], [21.35, -22.75], [21.25, -22.5]]]]}, "2024-12-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[21.25, -22.5], [21.47, -21.97], [22.0, -21.75], [22.53, -21.97], [22.75, -22.5], [22.65, -22.75], [22.68, -22.82], [23.03, -22.97], [23.18, -23.32], [23.25, -23.35], [23.5, -23.25], [23.75, -23.35], [23.82, -23.32], [23.97, -22.97], [24.5, -22.75], [25.03, -22.97], [25.18, -23.32], [25.25, -23.35], [25.5, -23.25], [25.75, -23.35], [26.0, -23.25], [26.53, -23.47], [26.68, -23.82], [26.75, -23.85], [27.0, -23.75], [27.53, -23.97], [27.75, -24.5], [27.53, -25.03], [27.18, -25.18], [27.03, -25.53], [26.5, -25.75], [25.97, -25.53], [25.82, -25.18], [25.75, -25.15], [25.5, -25.25], [25.25, -25.15], [25.0, -25.25], [24.75, -25.15], [24.5, -25.25], [24.25, -25.15], [24.0, -25.25], [23.75, -25.15], [23.5, -25.25], [23.25, -25.15], [23.0, -25.25], [22.75, -25.15], [22.5, -25.25], [21.97, -25.03], [21.75, -24.5], [21.85, -24.25], [21.75, -24.0], [21.85, -23.75], [21.82, -23.68], [21.47, -23.53], [21.25, -23.0], [21.35, -22.75], [21.25, -22.5]]]]}, "2024-12-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[21.25, -22.5], [21.47, -21.97], [22.0, -21.75], [22.53, -21.97], [22.75, -22.5], [22.65, -22.75], [22.75, -23.0], [22.53, -23.53], [22.0, -23.75], [21.47, -23.53], [21.25, -23.0], [21.35, -22.75], [21.25, -22.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -5.041416520771122}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.8340845579905767}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [22.70961786905923, 22.27533493042, 22.28413383578078, 22.66492200105091, 22.357902338884855, 23.297313944498683]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [21.200259145100915, 21.191482798258505, 20.743519083658896, 21.16592686971029, 21.03190383911135, 23.149446105957054]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.504401795013913, -4.0234048299105325, -4.092912986710656, -3.604692925602827, -3.8457033274139154, -3.2408972770987248]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.036463830836851, -5.041416520771122, -4.87506017984515, -4.425206442905903, -4.759438612225495, -3.3346028974825117]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3217230536571372, -1.4903011210600763, -1.5650681161112883, -1.3989989492766455, -1.5463596133877116, -1.5382714343488826]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5346378148665827, -1.9006892635175952, -1.873909598166829, -1.6462458449513666, -1.8135037466752866, -1.5527621793067723]}}