{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:09:19.372103", "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-Dec-15_to_2025-Dec-18_277.0_64.5"}, "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": 2025120000555}, "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": "December 15 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 18 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": 59569.532491334096}, "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": 64.5}, "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": 277.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "277.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 273.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 279.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 63.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 65.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-86.5, 65.75], [-86.25, 65.65], [-86.0, 65.75], [-85.5, 65.54], [-85.0, 65.75], [-84.75, 65.65], [-84.5, 65.75], [-84.25, 65.65], [-84.0, 65.75], [-83.75, 65.65], [-83.5, 65.75], [-83.25, 65.65], [-83.0, 65.75], [-82.47, 65.53], [-82.32, 65.18], [-82.25, 65.15], [-82.0, 65.25], [-81.75, 65.15], [-81.5, 65.25], [-80.97, 65.03], [-80.82, 64.68], [-80.75, 64.65], [-80.5, 64.75], [-79.97, 64.53], [-79.75, 64.0], [-79.85, 63.75], [-79.75, 63.5], [-79.97, 62.97], [-80.32, 62.82], [-80.47, 62.47], [-81.0, 62.25], [-81.25, 62.35], [-81.5, 62.25], [-81.75, 62.35], [-82.0, 62.25], [-82.25, 62.35], [-82.5, 62.25], [-83.0, 62.46], [-83.5, 62.25], [-83.75, 62.35], [-84.0, 62.25], [-84.53, 62.47], [-84.68, 62.82], [-85.0, 62.96], [-85.5, 62.75], [-86.03, 62.97], [-86.25, 63.5], [-86.15, 63.75], [-86.18, 63.82], [-86.53, 63.97], [-86.68, 64.32], [-87.03, 64.47], [-87.25, 65.0], [-87.03, 65.53], [-86.5, 65.75]]]]}}, "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": {"2025-12-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-83.52999999999997, 65.03], [-83.0, 65.25], [-82.47000000000003, 65.03], [-82.25, 64.5], [-82.47000000000003, 63.97], [-83.0, 63.75], [-83.52999999999997, 63.97], [-83.75, 64.5], [-83.52999999999997, 65.03]]]]}, "2025-12-16T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-87.02999999999997, 64.47], [-87.25, 65.0], [-87.02999999999997, 65.53], [-86.5, 65.75], [-86.25, 65.65], [-86.0, 65.75], [-85.5, 65.54], [-85.0, 65.75], [-84.75, 65.65], [-84.5, 65.75], [-84.25, 65.65], [-84.0, 65.75], [-83.75, 65.65], [-83.5, 65.75], [-83.25, 65.65], [-83.0, 65.75], [-82.47000000000003, 65.53], [-82.32, 65.18], [-82.25, 65.15], [-82.0, 65.25], [-81.75, 65.15], [-81.5, 65.25], [-80.97000000000003, 65.03], [-80.82, 64.68], [-80.75, 64.65], [-80.5, 64.75], [-79.97000000000003, 64.53], [-79.75, 64.0], [-79.85000000000002, 63.75], [-79.75, 63.5], [-79.97000000000003, 62.97], [-80.32, 62.82], [-80.47000000000003, 62.47], [-81.0, 62.25], [-81.25, 62.35], [-81.5, 62.25], [-81.75, 62.35], [-82.0, 62.25], [-82.25, 62.35], [-82.5, 62.25], [-83.0, 62.46], [-83.5, 62.25], [-83.75, 62.35], [-84.0, 62.25], [-84.52999999999997, 62.47], [-84.68, 62.82], [-85.0, 62.96], [-85.5, 62.75], [-86.02999999999997, 62.97], [-86.25, 63.5], [-86.14999999999998, 63.75], [-86.18, 63.82], [-86.52999999999997, 63.97], [-86.68, 64.32], [-87.02999999999997, 64.47]]]]}, "2025-12-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-87.02999999999997, 64.47], [-87.25, 65.0], [-87.02999999999997, 65.53], [-86.5, 65.75], [-86.25, 65.65], [-86.0, 65.75], [-85.5, 65.54], [-85.0, 65.75], [-84.75, 65.65], [-84.5, 65.75], [-84.25, 65.65], [-84.0, 65.75], [-83.75, 65.65], [-83.5, 65.75], [-83.25, 65.65], [-83.0, 65.75], [-82.47000000000003, 65.53], [-82.32, 65.18], [-82.25, 65.15], [-82.0, 65.25], [-81.75, 65.15], [-81.5, 65.25], [-80.97000000000003, 65.03], [-80.82, 64.68], [-80.75, 64.65], [-80.5, 64.75], [-79.97000000000003, 64.53], [-79.75, 64.0], [-79.85000000000002, 63.75], [-79.75, 63.5], [-79.97000000000003, 62.97], [-80.32, 62.82], [-80.47000000000003, 62.47], [-81.0, 62.25], [-81.25, 62.35], [-81.5, 62.25], [-81.75, 62.35], [-82.0, 62.25], [-82.25, 62.35], [-82.5, 62.25], [-83.0, 62.46], [-83.5, 62.25], [-83.75, 62.35], [-84.0, 62.25], [-84.52999999999997, 62.47], [-84.68, 62.82], [-85.0, 62.96], [-85.5, 62.75], [-86.02999999999997, 62.97], [-86.25, 63.5], [-86.14999999999998, 63.75], [-86.18, 63.82], [-86.52999999999997, 63.97], [-86.68, 64.32], [-87.02999999999997, 64.47]]]]}, "2025-12-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-87.02999999999997, 64.47], [-87.25, 65.0], [-87.02999999999997, 65.53], [-86.5, 65.75], [-86.25, 65.65], [-86.0, 65.75], [-85.5, 65.54], [-85.0, 65.75], [-84.75, 65.65], [-84.5, 65.75], [-84.25, 65.65], [-84.0, 65.75], [-83.75, 65.65], [-83.5, 65.75], [-83.25, 65.65], 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"description": "Mean t2m anomaly over entire duration", "value": -10.397400990886064}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-32.06542053222654, -30.791850327000475, -33.761861720229604, -32.07605671738136]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-32.06542053222654, -37.4935363769531, -40.84867960611976, -38.823295338948554]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-7.679860017186314, -9.071009101805242, -12.011880877849682, -10.17107528786009]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-7.679860017186314, -12.518023144932329, -16.313403620303376, -14.330737657997219]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.1021979031149387, -1.3563267902244807, -1.714747078608317, -1.404284688310003]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.1021979031149387, -1.597961812922085, -2.197247696365188, -1.6907868769500325]}}