{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:56:32.019602", "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-Aug-18_to_2025-Aug-21_287.5_43.5"}, "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": 2025080000589}, "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": "August 18 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 21 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": 72971.21901710704}, "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"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.North-America"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["North 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": ["North Atlantic Ocean"]}, "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": 43.5}, "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": 287.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "287.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 285.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 290.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 40.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 44.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-08-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-74.53, 44.53], [-74.0, 44.75], [-73.75, 44.65], [-73.5, 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"MultiPolygon", "coordinates": [[[[-73.18, 43.68], [-73.03, 44.03], [-72.5, 44.25], [-71.97, 44.03], [-71.82, 43.68], [-71.75, 43.65], [-71.68, 43.68], [-71.53, 44.03], [-71.0, 44.25], [-70.75, 44.15], [-70.5, 44.25], [-69.97, 44.03], [-69.75, 43.5], [-69.97, 42.97], [-70.32, 42.82], [-70.35, 42.75], [-70.25, 42.5], [-70.35, 42.25], [-70.25, 42.0], [-70.37, 41.7], [-70.25, 41.65], [-70.0, 41.75], [-69.75, 41.65], [-69.5, 41.75], [-68.97, 41.53], [-68.75, 41.0], [-68.97, 40.47], [-69.5, 40.25], [-69.75, 40.35], [-70.0, 40.25], [-70.25, 40.35], [-70.5, 40.25], [-70.75, 40.35], [-71.0, 40.25], [-71.53, 40.47], [-71.68, 40.82], [-71.75, 40.85], [-72.0, 40.75], [-72.25, 40.85], [-72.32, 40.82], [-72.47, 40.47], [-73.0, 40.25], [-73.25, 40.35], [-73.5, 40.25], [-74.03, 40.47], [-74.25, 41.0], [-74.03, 41.53], [-73.68, 41.68], [-73.57, 41.93], [-74.0, 41.75], [-74.53, 41.97], [-74.75, 42.5], [-74.53, 43.03], [-74.0, 43.25], [-73.7, 43.12], [-73.53, 43.53], [-73.18, 43.68]], [[-73.0, 42.25], 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