{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:09:17.005147", "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-Dec-13_to_2025-Dec-16_349.0_-71.5"}, "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": 2025120000477}, "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 13 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 16 2025"}, "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": 52515.894222281655}, "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": ["Antarctica"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Antarctica"]}, "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": -71.5}, "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": 349.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "349.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 349.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 355.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -74.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -71.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-11.54, -72.5], [-11.75, -72.0], [-11.65, -71.75], [-11.75, -71.5], [-11.53, -70.97], [-11.0, -70.75], [-10.75, -70.85], [-10.5, -70.75], [-10.25, -70.85], [-10.0, -70.75], [-9.75, -70.85], [-9.5, -70.75], [-8.97, -70.97], [-8.8, -71.37], [-8.5, -71.25], [-8.25, -71.35], [-8.0, -71.25], [-7.75, -71.35], [-7.5, -71.25], [-6.97, -71.47], [-6.82, -71.82], [-6.75, -71.85], [-6.5, -71.75], [-6.25, -71.85], [-6.0, -71.75], [-5.75, -71.85], [-5.5, -71.75], [-4.97, -71.97], [-4.82, -72.32], [-4.47, -72.47], [-4.25, -73.0], [-4.35, -73.25], [-4.25, -73.5], [-4.47, -74.03], [-5.0, -74.25], [-5.25, -74.15], [-5.5, -74.25], [-5.75, -74.15], [-5.82, -74.18], [-5.97, -74.53], [-6.5, -74.75], [-6.75, -74.65], [-7.0, -74.75], [-7.25, -74.65], [-7.5, -74.75], [-7.75, -74.65], [-8.0, -74.75], [-8.25, -74.65], [-8.5, -74.75], [-8.75, -74.65], [-9.0, -74.75], [-9.25, -74.65], [-9.5, -74.75], [-9.75, -74.65], [-10.0, -74.75], [-10.25, -74.65], [-10.5, -74.75], [-10.75, -74.65], [-11.0, -74.75], [-11.53, -74.53], [-11.75, -74.0], [-11.65, -73.75], [-11.75, -73.5], [-11.65, -73.25], [-11.75, -73.0], [-11.54, -72.5]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Antarctica"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-12-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-11.75, -73.5], [-11.649999999999977, -73.25], [-11.75, -73.0], [-11.54000000000002, -72.5], [-11.75, -72.0], [-11.649999999999977, -71.75], [-11.75, -71.5], [-11.529999999999973, -70.97], [-11.0, -70.75], [-10.75, -70.85], [-10.5, -70.75], [-10.25, -70.85], [-10.0, -70.75], [-9.75, -70.85], [-9.5, -70.75], [-8.970000000000027, -70.97], [-8.800000000000011, -71.37], [-8.5, -71.25], [-8.25, -71.35], [-8.0, -71.25], [-7.75, -71.35], [-7.5, -71.25], [-6.970000000000027, -71.47], [-6.819999999999993, -71.82], [-6.75, -71.85], [-6.5, -71.75], [-6.25, -71.85], [-6.0, -71.75], [-5.75, -71.85], [-5.5, -71.75], [-4.970000000000027, -71.97], [-4.819999999999993, -72.32], [-4.470000000000027, -72.47], [-4.25, -73.0], [-4.350000000000023, -73.25], [-4.25, -73.5], [-4.470000000000027, -74.03], [-5.0, -74.25], [-5.25, -74.15], [-5.5, -74.25], [-5.75, -74.15], [-5.819999999999993, -74.18], [-5.970000000000027, -74.53], [-6.5, -74.75], [-6.75, -74.65], [-7.0, -74.75], [-7.25, -74.65], [-7.5, -74.75], [-7.75, -74.65], [-8.0, -74.75], [-8.25, -74.65], [-8.5, -74.75], [-8.75, -74.65], [-9.0, -74.75], [-9.25, -74.65], [-9.5, -74.75], [-9.75, -74.65], [-10.0, -74.75], [-10.25, -74.65], [-10.5, -74.75], [-10.75, -74.65], [-11.0, -74.75], [-11.529999999999973, -74.53], [-11.75, -74.0], [-11.649999999999977, -73.75], [-11.75, -73.5]]]]}, "2025-12-14T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-11.75, -73.5], [-11.649999999999977, -73.25], [-11.75, -73.0], [-11.54000000000002, -72.5], [-11.75, -72.0], [-11.649999999999977, -71.75], [-11.75, -71.5], [-11.529999999999973, -70.97], [-11.0, -70.75], [-10.75, -70.85], 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{"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.6390925792555877}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-15.278437601286782, -16.28721713800536, -15.66758030639295, -7.879769388834632]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-21.33300374348957, -22.564071400960273, -21.03539123535154, -7.879769388834632]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.058264087379659, -4.1825940736440765, -3.6856831898892355, -3.101803016775648]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.5843892084425306, -5.174301692482288, -4.701284491994386, -3.101803016775648]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4378989501548725, -1.9557200281699105, -1.7437884106973134, -1.514065346267475]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.849497705446986, -2.4255082603672498, -2.541974816259837, -1.514065346267475]}}