{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-05-20 10:52:29.627765", "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": "2026-Apr-26_to_2026-May-01_292.5_65.0"}, "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": 2026040000817}, "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": "April 26 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 01 2026"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 6}, "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": 73320.09159046138}, "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"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.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": ["Davis Strait", "Hudson Strait"]}, "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": 65.0}, "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": 292.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "292.5\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": 295.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 63.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 66.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-04-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-66.53, 62.97], [-66.75, 63.5], [-66.53, 64.03], [-66.0, 64.25], [-65.47, 64.03], [-65.25, 63.5], [-65.47, 62.97], [-66.0, 62.75], [-66.53, 62.97]]], [[[-71.03, 66.03], [-70.5, 66.25], [-70.25, 66.15], [-70.0, 66.25], [-69.75, 66.15], [-69.5, 66.25], [-68.97, 66.03], [-68.82, 65.68], [-68.75, 65.65], [-68.5, 65.75], [-68.25, 65.65], [-68.0, 65.75], [-67.75, 65.65], [-67.5, 65.75], [-66.97, 65.53], [-66.75, 65.0], [-66.85, 64.75], [-66.75, 64.5], [-66.97, 63.97], [-67.5, 63.75], [-67.75, 63.85], [-68.0, 63.75], [-68.25, 63.85], [-68.32, 63.82], [-68.47, 63.47], [-69.0, 63.25], [-69.25, 63.35], [-69.5, 63.25], [-70.03, 63.47], [-70.18, 63.82], [-70.25, 63.85], [-70.5, 63.75], [-70.75, 63.85], [-71.0, 63.75], [-71.25, 63.85], [-71.5, 63.75], [-72.03, 63.97], [-72.25, 64.5], [-72.03, 65.03], [-71.68, 65.18], [-71.53, 65.53], [-71.18, 65.68], [-71.03, 66.03]]]]}, "2026-04-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-74.75, 65.0], [-74.53, 65.53], [-74.0, 65.75], [-73.75, 65.65], [-73.5, 65.75], [-73.25, 65.65], [-73.0, 65.75], [-72.75, 65.65], [-72.5, 65.75], [-72.25, 65.65], [-72.18, 65.68], [-72.03, 66.03], [-71.5, 66.25], [-71.25, 66.15], [-71.0, 66.25], [-70.75, 66.15], [-70.5, 66.25], [-70.25, 66.15], [-70.18, 66.18], [-70.03, 66.53], [-69.5, 66.75], [-69.25, 66.65], [-69.18, 66.68], [-69.03, 67.03], [-68.5, 67.25], [-68.25, 67.15], [-68.0, 67.25], [-67.75, 67.15], [-67.5, 67.25], [-67.25, 67.15], [-67.0, 67.25], [-66.47, 67.03], [-66.25, 66.5], [-66.47, 65.97], [-66.87, 65.8], [-66.82, 65.68], [-66.75, 65.65], [-66.5, 65.75], [-65.97, 65.53], [-65.82, 65.18], [-65.47, 65.03], [-65.32, 64.68], [-64.97, 64.53], [-64.82, 64.18], [-64.75, 64.15], [-64.5, 64.25], [-63.97, 64.03], [-63.75, 63.5], [-63.97, 62.97], [-64.5, 62.75], [-64.75, 62.85], [-65.0, 62.75], [-65.25, 62.85], [-65.5, 62.75], [-65.75, 62.85], [-66.0, 62.75], [-66.53, 62.97], [-66.75, 63.5], [-66.65, 63.75], [-66.68, 63.82], [-66.75, 63.85], [-67.0, 63.75], [-67.25, 63.85], [-67.5, 63.75], [-67.75, 63.85], [-68.0, 63.75], [-68.25, 63.85], [-68.32, 63.82], [-68.47, 63.47], [-69.0, 63.25], [-69.25, 63.35], [-69.5, 63.25], [-70.03, 63.47], [-70.18, 63.82], [-70.25, 63.85], [-70.5, 63.75], [-70.75, 63.85], [-71.0, 63.75], [-71.25, 63.85], [-71.5, 63.75], [-71.75, 63.85], [-72.0, 63.75], [-72.25, 63.85], [-72.5, 63.75], [-72.75, 63.85], [-73.0, 63.75], [-73.25, 63.85], [-73.5, 63.75], [-74.03, 63.97], [-74.18, 64.32], [-74.53, 64.47], [-74.75, 65.0]]]]}, "2026-04-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-74.75, 65.0], [-74.53, 65.53], [-74.0, 65.75], [-73.75, 65.65], [-73.5, 65.75], [-73.25, 65.65], [-73.0, 65.75], [-72.75, 65.65], [-72.5, 65.75], [-72.25, 65.65], [-72.18, 65.68], [-72.03, 66.03], [-71.5, 66.25], [-71.25, 66.15], [-71.0, 66.25], [-70.75, 66.15], [-70.5, 66.25], [-70.25, 66.15], [-70.18, 66.18], [-70.03, 66.53], [-69.5, 66.75], [-69.25, 66.65], [-69.18, 66.68], [-69.03, 67.03], [-68.5, 67.25], [-68.25, 67.15], [-68.0, 67.25], [-67.75, 67.15], [-67.5, 67.25], [-67.25, 67.15], [-67.0, 67.25], [-66.47, 67.03], [-66.25, 66.5], [-66.47, 65.97], [-66.87, 65.8], [-66.82, 65.68], [-66.75, 65.65], [-66.5, 65.75], [-65.97, 65.53], [-65.82, 65.18], [-65.47, 65.03], [-65.32, 64.68], [-64.97, 64.53], [-64.82, 64.18], [-64.75, 64.15], [-64.5, 64.25], [-63.97, 64.03], [-63.75, 63.5], [-63.97, 62.97], [-64.5, 62.75], [-64.75, 62.85], [-65.0, 62.75], [-65.25, 62.85], [-65.5, 62.75], [-65.75, 62.85], [-66.0, 62.75], [-66.53, 62.97], [-66.75, 63.5], [-66.65, 63.75], [-66.68, 63.82], [-66.75, 63.85], [-67.0, 63.75], [-67.25, 63.85], [-67.5, 63.75], [-67.75, 63.85], [-68.0, 63.75], [-68.25, 63.85], [-68.32, 63.82], [-68.47, 63.47], [-69.0, 63.25], [-69.25, 63.35], [-69.5, 63.25], [-70.03, 63.47], [-70.18, 63.82], [-70.25, 63.85], [-70.5, 63.75], [-70.75, 63.85], [-71.0, 63.75], [-71.25, 63.85], [-71.5, 63.75], [-71.75, 63.85], [-72.0, 63.75], [-72.25, 63.85], [-72.5, 63.75], [-72.75, 63.85], [-73.0, 63.75], [-73.25, 63.85], [-73.5, 63.75], [-74.03, 63.97], [-74.18, 64.32], [-74.53, 64.47], [-74.75, 65.0]]]]}, "2026-04-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-74.75, 65.0], [-74.53, 65.53], [-74.0, 65.75], [-73.75, 65.65], [-73.5, 65.75], [-73.25, 65.65], [-73.0, 65.75], [-72.75, 65.65], [-72.5, 65.75], [-72.25, 65.65], [-72.18, 65.68], [-72.03, 66.03], [-71.5, 66.25], [-71.25, 66.15], [-71.0, 66.25], [-70.75, 66.15], [-70.5, 66.25], [-70.25, 66.15], [-70.18, 66.18], [-70.03, 66.53], [-69.5, 66.75], [-69.25, 66.65], [-69.18, 66.68], [-69.03, 67.03], [-68.5, 67.25], [-68.25, 67.15], [-68.0, 67.25], [-67.75, 67.15], [-67.5, 67.25], [-67.25, 67.15], [-67.0, 67.25], [-66.47, 67.03], [-66.25, 66.5], [-66.47, 65.97], [-66.87, 65.8], [-66.82, 65.68], [-66.75, 65.65], [-66.5, 65.75], [-65.97, 65.53], [-65.82, 65.18], [-65.47, 65.03], [-65.32, 64.68], [-64.97, 64.53], [-64.82, 64.18], [-64.75, 64.15], [-64.5, 64.25], [-63.97, 64.03], [-63.75, 63.5], [-63.97, 62.97], [-64.5, 62.75], [-64.75, 62.85], [-65.0, 62.75], [-65.25, 62.85], [-65.5, 62.75], [-65.75, 62.85], [-66.0, 62.75], [-66.53, 62.97], [-66.75, 63.5], [-66.65, 63.75], [-66.68, 63.82], [-66.75, 63.85], [-67.0, 63.75], [-67.25, 63.85], [-67.5, 63.75], [-67.75, 63.85], [-68.0, 63.75], [-68.25, 63.85], [-68.5, 63.75], [-68.75, 63.85], [-69.0, 63.75], [-69.25, 63.85], [-69.5, 63.75], [-69.75, 63.85], [-70.0, 63.75], [-70.25, 63.85], [-70.5, 63.75], [-70.75, 63.85], [-71.0, 63.75], [-71.25, 63.85], [-71.5, 63.75], [-71.75, 63.85], [-72.0, 63.75], [-72.25, 63.85], [-72.5, 63.75], [-72.75, 63.85], [-73.0, 63.75], [-73.25, 63.85], [-73.5, 63.75], [-74.03, 63.97], [-74.18, 64.32], [-74.53, 64.47], [-74.75, 65.0]]]]}, "2026-04-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-72.75, 64.5], [-72.53, 65.03], [-72.0, 65.25], [-71.75, 65.15], [-71.5, 65.25], [-71.25, 65.15], [-71.18, 65.18], [-71.03, 65.53], [-70.5, 65.75], [-70.25, 65.65], [-70.0, 65.75], [-69.47, 65.53], [-69.25, 65.0], [-69.35, 64.75], [-69.25, 64.5], [-69.47, 63.97], [-70.0, 63.75], [-70.25, 63.85], [-70.5, 63.75], [-70.75, 63.85], [-71.0, 63.75], [-71.25, 63.85], [-71.5, 63.75], [-71.75, 63.85], [-72.0, 63.75], [-72.53, 63.97], [-72.75, 64.5]]], [[[-68.5, 65.25], [-69.03, 65.47], [-69.25, 66.0], [-69.03, 66.53], [-68.5, 66.75], [-67.97, 66.53], [-67.75, 66.0], [-67.93, 65.57], [-67.5, 65.75], [-67.25, 65.65], [-67.0, 65.75], [-66.47, 65.53], [-66.3, 65.13], [-66.0, 65.25], [-65.47, 65.03], [-65.32, 64.68], [-64.97, 64.53], [-64.82, 64.18], [-64.47, 64.03], [-64.25, 63.5], [-64.47, 62.97], [-65.0, 62.75], [-65.25, 62.85], [-65.5, 62.75], [-65.75, 62.85], [-66.0, 62.75], [-66.53, 62.97], [-66.75, 63.5], [-66.54, 64.0], [-66.7, 64.38], [-66.82, 64.32], [-66.97, 63.97], [-67.5, 63.75], [-68.03, 63.97], [-68.25, 64.5], [-68.15, 64.75], [-68.25, 65.0], [-68.07, 65.43], [-68.5, 65.25]]]]}, "2026-05-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-66.75, 64.5], [-66.53, 65.03], [-66.0, 65.25], [-65.47, 65.03], [-65.32, 64.68], [-64.97, 64.53], [-64.75, 64.0], [-64.97, 63.47], [-65.5, 63.25], [-66.03, 63.47], [-66.18, 63.82], [-66.53, 63.97], [-66.75, 64.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -11.070813870441242}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -8.112698925014744}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-17.79151528952775, -19.120126901354098, -17.97621578943162, -16.638702642092937, -15.80445176760361, -16.743306859334268]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-19.415017827351875, -22.944922510782845, -20.94872067769367, -18.884151840209938, -17.408155822753884, -16.793843968709268]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-7.017456732911115, -9.038724370839846, -8.474538329211464, -7.54707790995655, -7.192691158467891, -6.996787365012011]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-7.6060955012917475, -11.070813870441242, -10.440436464383623, -9.085500327451939, -8.407808090624826, -7.15932268599181]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3511390463876527, -1.8201982145651614, -1.7287909438976858, -1.5642368786644207, -1.5348629873914446, -1.5434726993040069]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.4766509195383095, -2.207553144566553, -2.1365363469023624, -1.8849808718173822, -1.7629205159824968, -1.5879718343898406]}}