{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:06:57.398816", "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-17_to_2025-Aug-20_290.5_50.5"}, "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": 2025080000629}, "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 17 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 20 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": 111012.62784386956}, "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"]}, "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": 50.5}, "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": 290.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "290.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 286.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 292.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 50.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 54.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-68.97, 49.97], [-69.5, 49.75], [-70.0, 49.96], [-70.32, 49.82], [-70.47, 49.47], [-71.0, 49.25], [-71.25, 49.35], [-71.5, 49.25], [-71.75, 49.35], [-72.0, 49.25], [-72.25, 49.35], [-72.5, 49.25], [-72.75, 49.35], [-73.0, 49.25], [-73.25, 49.35], [-73.5, 49.25], [-73.75, 49.35], [-74.0, 49.25], [-74.53, 49.47], [-74.75, 50.0], [-74.53, 50.53], [-74.18, 50.68], [-74.04, 51.0], [-74.25, 51.5], [-74.03, 52.03], [-73.5, 52.25], [-73.25, 52.15], [-73.18, 52.18], [-73.03, 52.53], [-72.5, 52.75], [-72.25, 52.65], [-72.18, 52.68], [-72.03, 53.03], [-71.5, 53.25], [-71.25, 53.15], [-71.18, 53.18], [-71.03, 53.53], [-70.5, 53.75], [-70.25, 53.65], [-70.18, 53.68], [-70.03, 54.03], [-69.5, 54.25], [-69.25, 54.15], [-69.0, 54.25], [-68.75, 54.15], [-68.68, 54.18], [-68.53, 54.53], [-68.0, 54.75], [-67.75, 54.65], [-67.5, 54.75], [-66.97, 54.53], [-66.75, 54.0], [-66.85, 53.75], [-66.75, 53.5], [-66.97, 52.97], [-67.32, 52.82], [-67.47, 52.47], [-67.82, 52.32], [-67.97, 51.97], [-68.32, 51.82], [-68.47, 51.47], [-68.82, 51.32], [-68.96, 51.0], [-68.75, 50.5], [-68.97, 49.97]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.E.North-America", "E.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-08-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-74.04000000000002, 51.0], [-74.25, 51.5], [-74.02999999999997, 52.03], [-73.5, 52.25], [-73.25, 52.15], [-73.18, 52.18], [-73.02999999999997, 52.53], [-72.5, 52.75], [-72.25, 52.65], [-72.18, 52.68], [-72.02999999999997, 53.03], [-71.5, 53.25], [-71.25, 53.15], [-71.18, 53.18], [-71.02999999999997, 53.53], [-70.5, 53.75], [-70.25, 53.65], [-70.18, 53.68], [-70.02999999999997, 54.03], [-69.5, 54.25], [-69.25, 54.15], [-69.0, 54.25], [-68.75, 54.15], [-68.68, 54.18], [-68.52999999999997, 54.53], [-68.0, 54.75], [-67.75, 54.65], [-67.5, 54.75], [-66.97000000000003, 54.53], [-66.75, 54.0], [-66.85000000000002, 53.75], [-66.75, 53.5], [-66.97000000000003, 52.97], [-67.32, 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-5.008019148032569}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [9.34409431323678, 7.276936270176691, 8.846578698870815, 10.583578999837243]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [7.624012247721396, 5.505921936035179, 7.364002482096396, 10.583578999837243]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.2151235674080985, -6.239990879225382, -4.5814924638290275, -3.4872545182498698]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.185271749975755, -7.039179790777041, -5.924574696558238, -3.4872545182498698]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5698479573791566, -2.3690682234236804, -1.752413565506711, -1.4849841872038883]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.852854907083286, -2.779654330068896, -2.480241893440961, -1.4849841872038883]}}