{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:13:24.587825", "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": "2021-Sep-11_to_2021-Sep-14_290.0_58.0"}, "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": 2021090000426}, "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": "September 11 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 14 2021"}, "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": 78685.12866018139}, "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": 58.0}, "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": 290.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "290.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 287.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 292.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 56.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 59.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-67.82, 58.18], [-67.47, 58.03], [-67.25, 57.5], [-67.35, 57.25], [-67.25, 57.0], [-67.47, 56.47], [-68.0, 56.25], [-68.25, 56.35], [-68.32, 56.32], [-68.47, 55.97], [-69.0, 55.75], [-69.25, 55.85], [-69.5, 55.75], [-69.75, 55.85], [-70.0, 55.75], [-70.53, 55.97], [-70.68, 56.32], [-70.75, 56.35], [-71.0, 56.25], [-71.25, 56.35], [-71.5, 56.25], [-72.03, 56.47], [-72.18, 56.82], [-72.25, 56.85], [-72.5, 56.75], [-73.03, 56.97], [-73.25, 57.5], [-73.15, 57.75], [-73.25, 58.0], [-73.15, 58.25], [-73.18, 58.32], [-73.53, 58.47], [-73.75, 59.0], [-73.53, 59.53], [-73.18, 59.68], [-73.03, 60.03], [-72.5, 60.25], [-72.25, 60.15], [-72.0, 60.25], [-71.75, 60.15], [-71.5, 60.25], [-71.25, 60.15], [-71.0, 60.25], [-70.47, 60.03], [-70.32, 59.68], [-70.25, 59.65], [-70.0, 59.75], [-69.47, 59.53], [-69.32, 59.18], [-69.25, 59.15], [-69.0, 59.25], [-68.47, 59.03], [-68.32, 58.68], [-67.97, 58.53], [-67.82, 58.18]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.E.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-09-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-73.52999999999997, 58.47], [-73.75, 59.0], [-73.52999999999997, 59.53], [-73.18, 59.68], [-73.02999999999997, 60.03], [-72.5, 60.25], [-72.25, 60.15], [-72.0, 60.25], [-71.75, 60.15], [-71.5, 60.25], [-71.25, 60.15], [-71.0, 60.25], [-70.47000000000003, 60.03], [-70.32, 59.68], [-70.25, 59.65], [-70.0, 59.75], [-69.47000000000003, 59.53], [-69.32, 59.18], [-69.25, 59.15], [-69.0, 59.25], [-68.47000000000003, 59.03], [-68.25, 58.5], [-68.35000000000002, 58.25], [-68.25, 58.0], [-68.47000000000003, 57.47], [-68.82, 57.32], [-68.97000000000003, 56.97], [-69.32, 56.82], [-69.47000000000003, 56.47], [-70.0, 56.25], [-70.25, 56.35], [-70.5, 56.25], [-70.75, 56.35], [-71.0, 56.25], [-71.25, 56.35], [-71.5, 56.25], [-72.02999999999997, 56.47], [-72.18, 56.82], [-72.25, 56.85], [-72.5, 56.75], [-73.02999999999997, 56.97], [-73.25, 57.5], [-73.14999999999998, 57.75], [-73.25, 58.0], [-73.14999999999998, 58.25], [-73.18, 58.32], [-73.52999999999997, 58.47]]]]}, "2021-09-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-73.52999999999997, 58.47], [-73.75, 59.0], [-73.52999999999997, 59.53], [-73.18, 59.68], [-73.02999999999997, 60.03], [-72.5, 60.25], [-72.25, 60.15], [-72.0, 60.25], [-71.75, 60.15], [-71.5, 60.25], [-71.25, 60.15], [-71.0, 60.25], [-70.47000000000003, 60.03], [-70.32, 59.68], [-70.25, 59.65], [-70.0, 59.75], [-69.47000000000003, 59.53], [-69.32, 59.18], [-69.25, 59.15], [-69.0, 59.25], [-68.47000000000003, 59.03], [-68.32, 58.68], [-67.97000000000003, 58.53], [-67.82, 58.18], [-67.47000000000003, 58.03], [-67.25, 57.5], [-67.35000000000002, 57.25], [-67.25, 57.0], [-67.47000000000003, 56.47], [-68.0, 56.25], [-68.25, 56.35], [-68.32, 56.32], [-68.47000000000003, 55.97], [-69.0, 55.75], [-69.25, 55.85], [-69.5, 55.75], [-69.75, 55.85], [-70.0, 55.75], [-70.52999999999997, 55.97], 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of maximum t2m.", "value": [2.090183599452473, 1.3469013046407667, 1.1542013828158701, 1.8731714359693683]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.6266729038112744, -4.37293823445422, -4.443002361012333, -4.1457627420360685]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.9495994484065022, -5.001311915270378, -5.069711489455074, -4.89073861004448]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.250919394219482, -1.4734620941252798, -1.4732981396574292, -1.3271269872236604]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.3283717318446555, 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