{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:02:57.351505", "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": "2025-Jan-16_to_2025-Jan-18_352.5_19.0"}, "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": 2025010000455}, "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 16 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 18 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 3}, "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": 87394.69159817632}, "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": ["Mali", "Mauritania"]}, "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": 19.0}, "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": 352.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "352.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 350.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 354.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 18.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 21.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-8.75, 19.65], [-8.68, 19.68], [-8.65, 19.75], [-8.68, 19.82], [-9.03, 19.97], [-9.25, 20.5], [-9.03, 21.03], [-8.5, 21.25], [-8.25, 21.15], [-8.18, 21.18], [-8.03, 21.53], [-7.5, 21.75], [-7.25, 21.65], [-7.0, 21.75], [-6.47, 21.53], [-6.32, 21.18], [-6.25, 21.15], [-6.0, 21.25], [-5.47, 21.03], [-5.32, 20.68], [-4.97, 20.53], [-4.75, 20.0], [-4.97, 19.47], [-5.32, 19.32], [-5.47, 18.97], [-6.0, 18.75], [-6.25, 18.85], [-6.32, 18.82], [-6.47, 18.47], [-6.82, 18.32], [-6.97, 17.97], [-7.32, 17.82], [-7.47, 17.47], [-8.0, 17.25], [-8.25, 17.35], [-8.5, 17.25], [-9.03, 17.47], [-9.18, 17.82], [-9.25, 17.85], [-9.5, 17.75], [-10.03, 17.97], [-10.25, 18.5], [-10.03, 19.03], [-9.68, 19.18], [-9.53, 19.53], [-9.0, 19.75], [-8.75, 19.65]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Sahara"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-01-16T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-9.529999999999973, 19.53], [-9.0, 19.75], [-8.75, 19.65], [-8.680000000000007, 19.68], [-8.649999999999977, 19.75], [-8.680000000000007, 19.82], [-9.029999999999973, 19.97], [-9.25, 20.5], [-9.029999999999973, 21.03], [-8.5, 21.25], [-8.25, 21.15], [-8.180000000000007, 21.18], [-8.029999999999973, 21.53], [-7.5, 21.75], [-7.25, 21.65], [-7.0, 21.75], [-6.470000000000027, 21.53], [-6.319999999999993, 21.18], [-6.25, 21.15], [-6.0, 21.25], [-5.470000000000027, 21.03], [-5.319999999999993, 20.68], [-4.970000000000027, 20.53], [-4.75, 20.0], [-4.970000000000027, 19.47], [-5.319999999999993, 19.32], [-5.470000000000027, 18.97], [-6.0, 18.75], [-6.25, 18.85], [-6.319999999999993, 18.82], [-6.470000000000027, 18.47], [-6.819999999999993, 18.32], [-6.970000000000027, 17.97], [-7.319999999999993, 17.82], [-7.470000000000027, 17.47], [-8.0, 17.25], [-8.25, 17.35], [-8.5, 17.25], [-9.029999999999973, 17.47], [-9.180000000000007, 17.82], [-9.25, 17.85], [-9.5, 17.75], [-10.029999999999973, 17.97], [-10.25, 18.5], [-10.029999999999973, 19.03], [-9.680000000000007, 19.18], [-9.529999999999973, 19.53]]]]}, "2025-01-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-9.529999999999973, 19.53], [-9.0, 19.75], [-8.75, 19.65], [-8.680000000000007, 19.68], [-8.649999999999977, 19.75], [-8.680000000000007, 19.82], [-9.029999999999973, 19.97], [-9.25, 20.5], [-9.029999999999973, 21.03], [-8.5, 21.25], [-8.25, 21.15], [-8.180000000000007, 21.18], [-8.029999999999973, 21.53], [-7.5, 21.75], [-7.25, 21.65], [-7.0, 21.75], [-6.470000000000027, 21.53], [-6.319999999999993, 21.18], [-6.25, 21.15], [-6.0, 21.25], [-5.470000000000027, 21.03], [-5.319999999999993, 20.68], [-4.970000000000027, 20.53], [-4.75, 20.0], [-4.970000000000027, 19.47], [-5.319999999999993, 19.32], [-5.470000000000027, 18.97], [-6.0, 18.75], [-6.25, 18.85], [-6.319999999999993, 18.82], [-6.470000000000027, 18.47], [-6.819999999999993, 18.32], [-6.970000000000027, 17.97], [-7.319999999999993, 17.82], [-7.470000000000027, 17.47], [-8.0, 17.25], [-8.25, 17.35], [-8.5, 17.25], [-9.029999999999973, 17.47], [-9.180000000000007, 17.82], [-9.25, 17.85], [-9.5, 17.75], [-10.029999999999973, 17.97], [-10.25, 18.5], [-10.029999999999973, 19.03], [-9.680000000000007, 19.18], [-9.529999999999973, 19.53]]]]}, "2025-01-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-9.529999999999973, 19.53], [-9.0, 19.75], [-8.75, 19.65], [-8.680000000000007, 19.68], [-8.649999999999977, 19.75], [-8.680000000000007, 19.82], [-9.029999999999973, 19.97], [-9.25, 20.5], [-9.029999999999973, 21.03], [-8.5, 21.25], [-8.25, 21.15], [-8.180000000000007, 21.18], [-8.029999999999973, 21.53], [-7.5, 21.75], [-7.25, 21.65], [-7.0, 21.75], [-6.470000000000027, 21.53], [-6.319999999999993, 21.18], [-6.25, 21.15], [-6.0, 21.25], [-5.470000000000027, 21.03], [-5.319999999999993, 20.68], [-4.970000000000027, 20.53], [-4.75, 20.0], [-4.970000000000027, 19.47], [-5.319999999999993, 19.32], [-5.470000000000027, 18.97], [-6.0, 18.75], [-6.25, 18.85], [-6.319999999999993, 18.82], [-6.470000000000027, 18.47], [-6.819999999999993, 18.32], [-6.970000000000027, 17.97], [-7.319999999999993, 17.82], [-7.470000000000027, 17.47], [-8.0, 17.25], [-8.25, 17.35], [-8.5, 17.25], [-9.029999999999973, 17.47], [-9.180000000000007, 17.82], [-9.25, 17.85], [-9.5, 17.75], [-10.029999999999973, 17.97], [-10.25, 18.5], [-10.029999999999973, 19.03], [-9.680000000000007, 19.18], [-9.529999999999973, 19.53]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -5.286587035358991}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.1338347456684135}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [12.917880842420857, 11.572166697184286, 12.835835266113293]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [11.745056406656943, 10.687319691975915, 12.07923533121749]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.7710370848618067, -4.986638313757684, -3.643828838385749]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.090492844087237, -5.286587035358991, -4.25389329001689]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5823680458178453, -2.07667739006737, -1.5183628923379127]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.6990616645741543, -2.1567333348184863, -1.6814040085162287]}}