{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:09:16.742183", "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-12_to_2025-Dec-16_282.5_41.5"}, "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": 2025120000463}, "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 12 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": 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": 145745.8108319418}, "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": ["United States"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["America"]}, "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": 41.5}, "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": 282.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "282.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 276.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 283.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 39.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 42.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-83.68, 40.18], [-83.65, 40.25], [-83.75, 40.5], [-83.53, 41.03], [-83.18, 41.18], [-83.03, 41.53], [-82.5, 41.75], 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"IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-12-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-78.02999999999997, 42.03], [-77.5, 42.25], [-76.97000000000003, 42.03], [-76.75, 41.5], [-76.97000000000003, 40.97], [-77.5, 40.75], [-78.02999999999997, 40.97], [-78.25, 41.5], [-78.02999999999997, 42.03]]]]}, "2025-12-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-78.02999999999997, 42.03], [-77.5, 42.25], [-76.97000000000003, 42.03], [-76.75, 41.5], [-76.97000000000003, 40.97], [-77.5, 40.75], [-78.02999999999997, 40.97], [-78.25, 41.5], [-78.02999999999997, 42.03]]]]}, "2025-12-14T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-84.02999999999997, 38.97], [-84.25, 39.5], [-84.02999999999997, 40.03], [-83.68, 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[-6.638859777450193, -6.926939420587871, -9.731075311118895, -12.60664974497669, -7.690650805291475]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.638859777450193, -6.926939420587871, -14.496005587124102, -17.21512366275431, -9.361010381742801]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3161757676464056, -1.3939755543898311, -1.946380159920103, -2.5887538276980755, -1.6021098056055523]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.3161757676464056, -1.3939755543898311, -2.7277402643712465, -3.4443907854259446, -2.063415977754219]}}