{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:02:53.223860", "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-07_to_2025-Jan-10_266.5_31.0"}, "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": 2025010000231}, "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 07 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 10 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": 226701.8011952857}, "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": 31.0}, "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": 266.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "266.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 266.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 277.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 26.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 32.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-94.15, 31.25], [-94.25, 31.5], [-94.15, 31.75], [-94.25, 32.0], [-94.03, 32.53], [-93.5, 32.75], [-92.97, 32.53], 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describing the boundary of the event at each time step", "value": {"2025-01-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-94.25, 30.5], [-94.14999999999998, 30.75], [-94.25, 31.0], [-94.14999999999998, 31.25], [-94.25, 31.5], [-94.14999999999998, 31.75], [-94.25, 32.0], [-94.02999999999997, 32.53], [-93.5, 32.75], [-92.97000000000003, 32.53], [-92.82, 32.18], [-92.75, 32.15], [-92.5, 32.25], [-91.97000000000003, 32.03], [-91.80000000000001, 31.62], [-91.5, 31.75], [-90.97000000000003, 31.53], [-90.82, 31.18], [-90.47000000000003, 31.03], [-90.32, 30.68], [-90.25, 30.65], [-90.18, 30.68], [-90.02999999999997, 31.03], [-89.5, 31.25], [-88.97000000000003, 31.03], [-88.82, 30.68], [-88.75, 30.65], [-88.68, 30.68], [-88.52999999999997, 31.03], [-88.0, 31.25], [-87.47000000000003, 31.03], [-87.32, 30.68], [-87.25, 30.65], [-87.0, 30.75], [-86.75, 30.65], [-86.5, 30.75], [-86.25, 30.65], [-86.0, 30.75], [-85.75, 30.65], [-85.5, 30.75], [-84.97000000000003, 30.53], 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