{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:07:01.313249", "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-23_to_2025-Aug-25_265.0_48.0"}, "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": 2025080000799}, "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 23 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 25 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": 82023.27199634143}, "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": ["Canada", "United States"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["America", "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": 48.0}, "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": 265.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "265.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 263.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 267.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 47.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 51.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-97.75, 50.5], [-97.53, 51.03], [-97.0, 51.25], [-96.75, 51.15], [-96.68, 51.18], [-96.65, 51.25], [-96.75, 51.5], [-96.53, 52.03], [-96.0, 52.25], [-95.75, 52.15], [-95.5, 52.25], [-95.25, 52.15], [-95.0, 52.25], [-94.47, 52.03], [-94.25, 51.5], [-94.35, 51.25], [-94.32, 51.18], [-94.25, 51.15], [-94.18, 51.18], [-94.03, 51.53], [-93.5, 51.75], [-92.97, 51.53], [-92.82, 51.18], [-92.47, 51.03], [-92.25, 50.5], [-92.47, 49.97], [-92.82, 49.82], [-92.85, 49.75], [-92.82, 49.68], [-92.47, 49.53], [-92.25, 49.0], [-92.47, 48.47], [-93.0, 48.25], [-93.25, 48.35], [-93.5, 48.25], [-93.75, 48.35], [-94.0, 48.25], [-94.25, 48.35], [-94.37, 48.3], [-94.25, 48.0], [-94.35, 47.75], [-94.25, 47.5], [-94.47, 46.97], [-94.82, 46.82], [-94.97, 46.47], [-95.5, 46.25], [-96.03, 46.47], [-96.25, 47.0], [-96.15, 47.25], [-96.18, 47.32], [-96.53, 47.47], [-96.68, 47.82], [-97.03, 47.97], [-97.25, 48.5], [-97.03, 49.03], [-96.5, 49.25], [-96.25, 49.15], [-96.18, 49.18], [-96.15, 49.25], [-96.25, 49.5], [-96.15, 49.75], [-96.18, 49.82], [-96.25, 49.85], [-96.5, 49.75], [-96.75, 49.85], [-97.0, 49.75], [-97.53, 49.97], [-97.75, 50.5]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.E.North-America", "C.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-08-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-97.0, 49.75], [-97.52999999999997, 49.97], [-97.75, 50.5], [-97.52999999999997, 51.03], [-97.0, 51.25], [-96.75, 51.15], [-96.68, 51.18], [-96.64999999999998, 51.25], [-96.75, 51.5], [-96.52999999999997, 52.03], [-96.0, 52.25], [-95.75, 52.15], [-95.5, 52.25], [-95.25, 52.15], [-95.0, 52.25], [-94.47000000000003, 52.03], [-94.25, 51.5], [-94.35000000000002, 51.25], [-94.32, 51.18], [-94.25, 51.15], [-94.18, 51.18], [-94.02999999999997, 51.53], [-93.5, 51.75], [-92.97000000000003, 51.53], [-92.82, 51.18], [-92.47000000000003, 51.03], [-92.25, 50.5], [-92.47000000000003, 49.97], [-92.82, 49.82], [-92.85000000000002, 49.75], [-92.82, 49.68], [-92.47000000000003, 49.53], [-92.25, 49.0], [-92.47000000000003, 48.47], [-93.0, 48.25], [-93.25, 48.35], [-93.5, 48.25], [-93.75, 48.35], [-94.0, 48.25], [-94.25, 48.35], [-94.37, 48.3], [-94.25, 48.0], [-94.35000000000002, 47.75], [-94.25, 47.5], [-94.47000000000003, 46.97], [-94.82, 46.82], [-94.97000000000003, 46.47], [-95.5, 46.25], [-96.02999999999997, 46.47], [-96.25, 47.0], [-96.14999999999998, 47.25], [-96.18, 47.32], [-96.52999999999997, 47.47], [-96.68, 47.82], [-97.02999999999997, 47.97], [-97.25, 48.5], [-97.02999999999997, 49.03], [-96.5, 49.25], [-96.25, 49.15], [-96.18, 49.18], [-96.14999999999998, 49.25], [-96.25, 49.5], [-96.14999999999998, 49.75], [-96.18, 49.82], [-96.25, 49.85], [-96.5, 49.75], [-96.75, 49.85], [-97.0, 49.75]]]]}, "2025-08-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-97.0, 49.75], [-97.52999999999997, 49.97], [-97.75, 50.5], [-97.52999999999997, 51.03], [-97.0, 51.25], [-96.75, 51.15], [-96.68, 51.18], [-96.64999999999998, 51.25], [-96.75, 51.5], [-96.52999999999997, 52.03], [-96.0, 52.25], [-95.75, 52.15], [-95.5, 52.25], [-95.25, 52.15], [-95.0, 52.25], [-94.47000000000003, 52.03], [-94.25, 51.5], [-94.35000000000002, 51.25], [-94.32, 51.18], [-94.25, 51.15], [-94.18, 51.18], [-94.02999999999997, 51.53], [-93.5, 51.75], [-92.97000000000003, 51.53], [-92.82, 51.18], [-92.47000000000003, 51.03], [-92.25, 50.5], [-92.47000000000003, 49.97], [-92.82, 49.82], [-92.85000000000002, 49.75], [-92.82, 49.68], [-92.47000000000003, 49.53], [-92.25, 49.0], [-92.47000000000003, 48.47], [-93.0, 48.25], [-93.25, 48.35], [-93.5, 48.25], [-93.75, 48.35], [-94.0, 48.25], [-94.25, 48.35], [-94.37, 48.3], [-94.25, 48.0], [-94.35000000000002, 47.75], [-94.25, 47.5], [-94.47000000000003, 46.97], [-94.82, 46.82], [-94.97000000000003, 46.47], [-95.5, 46.25], [-96.02999999999997, 46.47], [-96.25, 47.0], [-96.14999999999998, 47.25], [-96.18, 47.32], [-96.52999999999997, 47.47], [-96.68, 47.82], 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anomaly over entire duration", "value": -5.003372032276615}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [13.982041496959141, 12.623117158471075, 12.75447318844681]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [12.30329284667971, 11.236819203694665, 11.946655527750693]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.224569711080471, -5.498750567701666, -5.2867958180477075]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.992903994564813, -5.848728454624791, -6.929263318059043]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4149957574515375, -1.875591766538104, -1.7613433279561765]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.6344816944525067, -2.196687944249791, -2.2032795154958436]}}