{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:57:02.157941", "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-Jan-17_to_2024-Jan-20_28.5_-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": 2024010000471}, "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": "January 17 2024"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 20 2024"}, "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": 56308.25774687716}, "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": ["Lesotho", "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": -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": 28.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "28.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 27.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 31.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -30.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -29.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[26.97, -28.97], [27.5, -28.75], [27.75, -28.85], [28.0, -28.75], [28.25, -28.85], [28.5, -28.75], [28.75, -28.85], [29.0, -28.75], [29.25, -28.85], [29.32, -28.82], [29.47, -28.47], [30.0, -28.25], [30.5, -28.46], [31.0, -28.25], [31.53, -28.47], [31.75, -29.0], [31.65, -29.25], [31.75, -29.5], [31.53, -30.03], [31.0, -30.25], [30.75, -30.15], [30.5, -30.25], [30.25, -30.15], [30.18, -30.18], [30.15, -30.25], [30.25, -30.5], [30.03, -31.03], [29.5, -31.25], [29.25, -31.15], [29.0, -31.25], [28.75, -31.15], [28.5, -31.25], [28.0, -31.04], [27.5, -31.25], [27.25, -31.15], [27.0, -31.25], [26.47, -31.03], [26.25, -30.5], [26.35, -30.25], [26.25, -30.0], [26.47, -29.47], [26.82, -29.32], [26.97, -28.97]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Southern-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2024-01-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[26.25, -30.0], [26.47, -29.47], [26.82, -29.32], [26.97, -28.97], [27.5, -28.75], [27.75, -28.85], [28.0, -28.75], [28.25, -28.85], [28.5, -28.75], [28.75, -28.85], [29.0, -28.75], [29.25, -28.85], [29.32, -28.82], [29.47, -28.47], [30.0, -28.25], [30.5, -28.46], [31.0, -28.25], [31.53, -28.47], [31.75, -29.0], [31.65, -29.25], [31.75, -29.5], [31.53, -30.03], [31.0, -30.25], [30.75, -30.15], [30.5, -30.25], [30.25, -30.15], [30.18, -30.18], [30.15, -30.25], [30.25, -30.5], [30.03, -31.03], [29.5, -31.25], [29.25, -31.15], [29.0, -31.25], [28.75, -31.15], [28.5, -31.25], [28.0, -31.04], [27.5, -31.25], [27.25, -31.15], [27.0, -31.25], [26.47, -31.03], [26.25, -30.5], [26.35, -30.25], [26.25, -30.0]]]]}, "2024-01-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[26.25, -30.0], [26.47, -29.47], [26.82, -29.32], [26.97, -28.97], [27.5, -28.75], [27.75, -28.85], [28.0, -28.75], [28.25, -28.85], [28.5, -28.75], [28.75, -28.85], [29.0, -28.75], [29.25, -28.85], [29.32, -28.82], [29.47, -28.47], [30.0, -28.25], [30.5, -28.46], [31.0, -28.25], [31.53, -28.47], [31.75, -29.0], [31.65, -29.25], [31.75, -29.5], [31.53, -30.03], [31.0, -30.25], [30.75, -30.15], [30.5, -30.25], [30.25, -30.15], [30.18, -30.18], [30.15, -30.25], [30.25, -30.5], [30.03, -31.03], [29.5, -31.25], [29.25, -31.15], [29.0, -31.25], [28.75, -31.15], [28.5, -31.25], [28.0, -31.04], [27.5, -31.25], [27.25, -31.15], [27.0, -31.25], [26.47, -31.03], [26.25, -30.5], [26.35, -30.25], [26.25, -30.0]]]]}, "2024-01-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[26.25, -30.0], [26.47, -29.47], [26.82, -29.32], [26.97, -28.97], [27.5, -28.75], [27.75, -28.85], [28.0, -28.75], [28.25, -28.85], [28.5, -28.75], [28.75, -28.85], [29.0, -28.75], [29.25, -28.85], [29.32, -28.82], [29.47, -28.47], [30.0, -28.25], [30.5, -28.46], [31.0, -28.25], [31.53, -28.47], [31.75, -29.0], [31.65, -29.25], [31.75, -29.5], [31.53, -30.03], [31.0, -30.25], [30.75, -30.15], [30.5, -30.25], [30.25, -30.15], [30.18, -30.18], [30.15, -30.25], [30.25, -30.5], [30.03, -31.03], [29.5, -31.25], [29.25, -31.15], [29.0, -31.25], [28.75, -31.15], [28.5, -31.25], [28.0, -31.04], [27.5, -31.25], [27.25, -31.15], [27.0, -31.25], [26.47, -31.03], [26.25, -30.5], [26.35, -30.25], [26.25, -30.0]]]]}, "2024-01-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[26.97, -28.97], [27.5, -28.75], [28.03, -28.97], [28.25, -29.5], [28.03, -30.03], [27.5, -30.25], [26.97, -30.03], [26.75, -29.5], [26.97, -28.97]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -5.235873266221574}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.633007576897792}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [15.083743809506814, 14.60673674241508, 15.724618475655461, 17.906466904665592]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [12.312551588738017, 10.746825173404943, 12.700811577253603, 17.906466904665592]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.7467472085947624, -4.164486824206817, -3.0568135800518506, -2.1834850515366497]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.235873266221574, -5.015527226583686, -4.633210137474919, -2.1834850515366497]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.6596557892980672, -2.003517924144951, -1.5333548321465216, -1.2025454879133075]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.1274110388639134, -2.606823061635058, -1.8321914881858279, -1.2025454879133075]}}