{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-05-20 10:52:27.703560", "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-07_to_2026-Apr-13_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": 2026040000253}, "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 07 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 13 2026"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 7}, "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": 69407.57536037745}, "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": ["Hudson Bay", "The Northwestern Passages"]}, "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": 266.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 278.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 63.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 68.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-04-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-83.53, 63.97], [-83.75, 64.5], [-83.53, 65.03], [-83.0, 65.25], [-82.75, 65.15], [-82.5, 65.25], [-81.97, 65.03], [-81.75, 64.5], [-81.97, 63.97], [-82.5, 63.75], [-82.75, 63.85], [-83.0, 63.75], [-83.53, 63.97]]]]}, "2026-04-08T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-83.75, 64.5], [-83.53, 65.03], [-83.0, 65.25], [-82.75, 65.15], [-82.5, 65.25], [-81.97, 65.03], [-81.75, 64.5], [-81.85, 64.25], [-81.75, 64.0], [-81.97, 63.47], [-82.5, 63.25], [-83.03, 63.47], [-83.18, 63.82], [-83.53, 63.97], [-83.75, 64.5]]]]}, "2026-04-09T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-89.03, 65.47], [-89.25, 66.0], [-89.03, 66.53], [-88.5, 66.75], [-88.25, 66.65], [-88.0, 66.75], [-87.47, 66.53], [-87.32, 66.18], [-87.25, 66.15], [-87.0, 66.25], [-86.75, 66.15], [-86.5, 66.25], [-86.25, 66.15], [-86.0, 66.25], [-85.75, 66.15], [-85.5, 66.25], [-85.25, 66.15], [-85.18, 66.18], [-85.03, 66.53], [-84.5, 66.75], [-83.97, 66.53], [-83.75, 66.0], [-83.87, 65.7], [-83.75, 65.65], [-83.5, 65.75], [-82.97, 65.53], [-82.82, 65.18], [-82.75, 65.15], [-82.5, 65.25], [-82.25, 65.15], [-82.0, 65.25], [-81.47, 65.03], [-81.25, 64.5], [-81.47, 63.97], [-81.82, 63.82], [-81.97, 63.47], [-82.5, 63.25], [-83.03, 63.47], [-83.18, 63.82], [-83.25, 63.85], [-83.5, 63.75], [-83.75, 63.85], [-84.0, 63.75], [-84.25, 63.85], [-84.5, 63.75], [-84.75, 63.85], [-85.0, 63.75], [-85.25, 63.85], [-85.5, 63.75], [-85.75, 63.85], [-86.0, 63.75], [-86.25, 63.85], [-86.5, 63.75], [-87.03, 63.97], [-87.2, 64.38], [-87.5, 64.25], [-88.03, 64.47], [-88.25, 65.0], [-88.15, 65.25], [-88.18, 65.32], [-88.25, 65.35], [-88.5, 65.25], [-89.03, 65.47]]]]}, "2026-04-10T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-89.25, 66.0], [-89.03, 66.53], [-88.68, 66.68], [-88.65, 66.75], [-88.75, 67.0], [-88.53, 67.53], [-88.0, 67.75], [-87.75, 67.65], [-87.5, 67.75], [-86.97, 67.53], [-86.82, 67.18], [-86.47, 67.03], [-86.32, 66.68], [-85.97, 66.53], [-85.82, 66.18], [-85.75, 66.15], [-85.5, 66.25], [-85.25, 66.15], [-85.18, 66.18], [-85.03, 66.53], [-84.5, 66.75], [-83.97, 66.53], [-83.75, 66.0], [-83.87, 65.7], [-83.75, 65.65], [-83.5, 65.75], [-82.97, 65.53], [-82.82, 65.18], [-82.75, 65.15], [-82.5, 65.25], [-82.25, 65.15], [-82.0, 65.25], [-81.47, 65.03], [-81.25, 64.5], [-81.47, 63.97], [-81.82, 63.82], [-81.97, 63.47], [-82.5, 63.25], [-83.03, 63.47], [-83.18, 63.82], [-83.25, 63.85], [-83.5, 63.75], [-83.75, 63.85], [-84.0, 63.75], [-84.25, 63.85], [-84.5, 63.75], [-84.75, 63.85], [-85.0, 63.75], [-85.25, 63.85], [-85.5, 63.75], [-85.75, 63.85], [-86.0, 63.75], [-86.25, 63.85], [-86.5, 63.75], [-87.03, 63.97], [-87.2, 64.38], [-87.5, 64.25], [-88.03, 64.47], [-88.18, 64.82], [-88.53, 64.97], [-88.68, 65.32], [-89.03, 65.47], [-89.25, 66.0]]]]}, "2026-04-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-94.03, 67.47], [-94.25, 68.0], [-94.03, 68.53], [-93.5, 68.75], [-93.25, 68.65], [-93.0, 68.75], [-92.75, 68.65], [-92.5, 68.75], [-91.97, 68.53], [-91.82, 68.18], [-91.75, 68.15], [-91.5, 68.25], [-91.25, 68.15], [-91.0, 68.25], [-90.75, 68.15], [-90.5, 68.25], [-89.97, 68.03], [-89.82, 67.68], [-89.75, 67.65], [-89.5, 67.75], [-88.97, 67.53], [-88.82, 67.18], [-88.7, 67.13], [-88.53, 67.53], [-88.0, 67.75], [-87.75, 67.65], [-87.5, 67.75], [-86.97, 67.53], [-86.82, 67.18], [-86.47, 67.03], [-86.32, 66.68], [-85.97, 66.53], [-85.82, 66.18], [-85.75, 66.15], [-85.5, 66.25], [-85.25, 66.15], [-85.18, 66.18], [-85.03, 66.53], [-84.5, 66.75], [-83.97, 66.53], [-83.75, 66.0], [-83.87, 65.7], [-83.75, 65.65], [-83.5, 65.75], [-82.97, 65.53], [-82.82, 65.18], [-82.75, 65.15], [-82.5, 65.25], [-82.25, 65.15], [-82.0, 65.25], [-81.47, 65.03], [-81.25, 64.5], [-81.47, 63.97], [-82.0, 63.75], [-82.25, 63.85], [-82.5, 63.75], [-82.75, 63.85], [-83.0, 63.75], [-83.25, 63.85], [-83.5, 63.75], [-83.75, 63.85], [-84.0, 63.75], [-84.25, 63.85], [-84.5, 63.75], [-84.75, 63.85], [-85.0, 63.75], [-85.25, 63.85], [-85.5, 63.75], [-85.75, 63.85], [-86.0, 63.75], [-86.25, 63.85], [-86.5, 63.75], [-87.03, 63.97], [-87.2, 64.38], [-87.5, 64.25], [-88.03, 64.47], [-88.18, 64.82], [-88.25, 64.85], [-88.5, 64.75], [-89.03, 64.97], [-89.2, 65.38], [-89.5, 65.25], [-89.75, 65.35], [-90.0, 65.25], [-90.53, 65.47], [-90.68, 65.82], [-90.75, 65.85], [-91.0, 65.75], [-91.53, 65.97], [-91.68, 66.32], [-92.03, 66.47], [-92.18, 66.82], [-92.53, 66.97], [-92.68, 67.32], [-92.75, 67.35], [-93.0, 67.25], [-93.25, 67.35], [-93.5, 67.25], [-94.03, 67.47]]]]}, "2026-04-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-94.03, 67.47], [-94.25, 68.0], [-94.03, 68.53], [-93.5, 68.75], [-93.25, 68.65], [-93.0, 68.75], [-92.75, 68.65], [-92.5, 68.75], [-91.97, 68.53], [-91.82, 68.18], [-91.75, 68.15], [-91.5, 68.25], [-91.25, 68.15], [-91.0, 68.25], [-90.75, 68.15], [-90.5, 68.25], [-89.97, 68.03], [-89.82, 67.68], [-89.75, 67.65], [-89.5, 67.75], [-88.97, 67.53], [-88.82, 67.18], [-88.7, 67.13], [-88.53, 67.53], [-88.0, 67.75], [-87.75, 67.65], [-87.5, 67.75], [-86.97, 67.53], [-86.82, 67.18], [-86.47, 67.03], [-86.32, 66.68], [-85.97, 66.53], [-85.8, 66.13], [-85.5, 66.25], [-85.25, 66.15], [-85.0, 66.25], [-84.47, 66.03], [-84.32, 65.68], [-84.25, 65.65], [-84.0, 65.75], [-83.47, 65.53], [-83.25, 65.0], [-83.47, 64.47], [-84.0, 64.25], [-84.25, 64.35], [-84.5, 64.25], [-85.0, 64.46], [-85.5, 64.25], [-86.03, 64.47], [-86.25, 65.0], [-86.15, 65.25], [-86.2, 65.38], [-86.32, 65.32], [-86.47, 64.97], [-86.82, 64.82], [-86.97, 64.47], [-87.5, 64.25], [-88.03, 64.47], [-88.18, 64.82], [-88.25, 64.85], [-88.5, 64.75], [-89.03, 64.97], [-89.2, 65.38], [-89.5, 65.25], [-89.75, 65.35], [-90.0, 65.25], [-90.53, 65.47], [-90.68, 65.82], [-90.75, 65.85], [-91.0, 65.75], [-91.53, 65.97], [-91.68, 66.32], [-92.03, 66.47], [-92.18, 66.82], [-92.53, 66.97], [-92.68, 67.32], [-92.75, 67.35], [-93.0, 67.25], [-93.25, 67.35], [-93.5, 67.25], [-94.03, 67.47]]]]}, "2026-04-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-94.03, 67.47], [-94.25, 68.0], [-94.03, 68.53], [-93.5, 68.75], [-93.25, 68.65], [-93.0, 68.75], [-92.75, 68.65], [-92.5, 68.75], [-91.97, 68.53], [-91.82, 68.18], [-91.75, 68.15], [-91.5, 68.25], [-91.25, 68.15], [-91.0, 68.25], [-90.75, 68.15], [-90.5, 68.25], [-89.97, 68.03], [-89.82, 67.68], [-89.75, 67.65], [-89.5, 67.75], [-88.97, 67.53], [-88.82, 67.18], [-88.47, 67.03], [-88.25, 66.5], [-88.37, 66.2], [-87.97, 66.03], [-87.75, 65.5], [-87.97, 64.97], [-88.5, 64.75], [-89.03, 64.97], [-89.2, 65.38], [-89.5, 65.25], [-89.75, 65.35], [-90.0, 65.25], [-90.53, 65.47], [-90.68, 65.82], [-90.75, 65.85], [-91.0, 65.75], [-91.53, 65.97], [-91.68, 66.32], [-92.03, 66.47], [-92.18, 66.82], [-92.53, 66.97], [-92.68, 67.32], [-92.75, 67.35], [-93.0, 67.25], [-93.25, 67.35], [-93.5, 67.25], [-94.03, 67.47]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -11.383201763005786}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -7.3885723505282055}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-24.436339441935218, -23.345985370212105, -24.685625269383593, -24.864999771118192, -26.186058002047986, -28.16081165514487, -28.024358145395865]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-24.853046798706032, -24.152599080403633, -26.78461367289222, -26.76597633361814, -29.778899256388314, -32.07109425862629, -29.841818237304665]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-6.481097847213775, -6.337625240617892, -7.207169519003058, -6.942126250798078, -7.053631254949154, -8.390206257775441, -7.664372898726585]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.771360849147953, -6.556532597238828, -8.692214152754474, -8.730698873677142, -8.665101178958281, -11.383201763005786, -9.185881300928713]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3363212381907212, -1.3309858144181834, -1.497791381218434, -1.4435345472880625, -1.3847823242820405, -1.5329070565285812, -1.3358890326910362]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.3808898429609902, -1.4071537410731025, -1.7627953256866111, -1.842190255124141, -1.6223624375172054, -1.9703902685823065, -1.5640310585477288]}}