{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:58:20.886476", "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-Jan-20_to_2026-Jan-23_279.5_57.5"}, "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": 2026010000586}, "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": "January 20 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 23 2026"}, "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": 104781.54130294392}, "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"]}, "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": 57.5}, "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": 279.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "279.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 277.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 285.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 55.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 59.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-01-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-81.75, 57.0], [-81.53, 57.53], [-81.18, 57.68], [-81.03, 58.03], [-80.5, 58.25], [-79.97, 58.03], [-79.82, 57.68], [-79.47, 57.53], [-79.32, 57.18], [-79.25, 57.15], [-79.0, 57.25], [-78.47, 57.03], [-78.25, 56.5], [-78.47, 55.97], [-78.82, 55.82], [-78.97, 55.47], [-79.5, 55.25], [-79.75, 55.35], [-80.0, 55.25], [-80.25, 55.35], [-80.5, 55.25], [-81.03, 55.47], [-81.25, 56.0], [-81.15, 56.25], [-81.18, 56.32], [-81.53, 56.47], [-81.75, 57.0]]]]}, "2026-01-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-82.75, 57.5], [-82.53, 58.03], [-82.18, 58.18], [-82.15, 58.25], [-82.25, 58.5], [-82.03, 59.03], [-81.68, 59.18], [-81.53, 59.53], [-81.0, 59.75], [-80.75, 59.65], [-80.5, 59.75], [-80.25, 59.65], [-80.0, 59.75], [-79.75, 59.65], [-79.5, 59.75], [-78.97, 59.53], [-78.82, 59.18], [-78.75, 59.15], [-78.5, 59.25], [-78.25, 59.15], [-78.0, 59.25], [-77.47, 59.03], [-77.32, 58.68], [-76.97, 58.53], [-76.82, 58.18], [-76.75, 58.15], [-76.5, 58.25], [-76.25, 58.15], [-76.0, 58.25], [-75.75, 58.15], [-75.5, 58.25], [-75.25, 58.15], [-75.0, 58.25], [-74.47, 58.03], [-74.32, 57.68], [-73.97, 57.53], [-73.75, 57.0], [-73.85, 56.75], [-73.75, 56.5], [-73.85, 56.25], [-73.75, 56.0], [-73.97, 55.47], [-74.5, 55.25], [-75.03, 55.47], [-75.25, 56.0], [-75.15, 56.25], [-75.18, 56.32], [-75.25, 56.35], [-75.5, 56.25], [-75.75, 56.35], [-75.82, 56.32], [-75.97, 55.97], [-76.5, 55.75], [-76.75, 55.85], [-77.0, 55.75], [-77.25, 55.85], [-77.5, 55.75], [-77.75, 55.85], [-78.0, 55.75], [-78.5, 55.96], [-78.82, 55.82], [-78.97, 55.47], [-79.5, 55.25], [-79.75, 55.35], [-80.0, 55.25], [-80.25, 55.35], [-80.5, 55.25], [-81.03, 55.47], [-81.25, 56.0], [-81.15, 56.25], [-81.18, 56.32], [-81.25, 56.35], [-81.5, 56.25], [-82.03, 56.47], [-82.18, 56.82], [-82.53, 56.97], [-82.75, 57.5]]]]}, "2026-01-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-82.75, 57.5], [-82.53, 58.03], [-82.18, 58.18], [-82.15, 58.25], [-82.25, 58.5], [-82.03, 59.03], [-81.68, 59.18], [-81.53, 59.53], [-81.0, 59.75], [-80.75, 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56.25], [-81.18, 56.32], [-81.25, 56.35], [-81.5, 56.25], [-82.03, 56.47], [-82.18, 56.82], [-82.53, 56.97], [-82.75, 57.5]]]]}, "2026-01-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-82.75, 57.5], [-82.53, 58.03], [-82.18, 58.18], [-82.15, 58.25], [-82.25, 58.5], [-82.03, 59.03], [-81.68, 59.18], [-81.53, 59.53], [-81.0, 59.75], [-80.75, 59.65], [-80.5, 59.75], [-80.25, 59.65], [-80.0, 59.75], [-79.75, 59.65], [-79.5, 59.75], [-78.97, 59.53], [-78.82, 59.18], [-78.75, 59.15], [-78.5, 59.25], [-78.25, 59.15], [-78.0, 59.25], [-77.47, 59.03], [-77.32, 58.68], [-76.97, 58.53], [-76.82, 58.18], [-76.75, 58.15], [-76.5, 58.25], [-76.25, 58.15], [-76.0, 58.25], [-75.75, 58.15], [-75.5, 58.25], [-75.25, 58.15], [-75.0, 58.25], [-74.47, 58.03], [-74.32, 57.68], [-73.97, 57.53], [-73.75, 57.0], [-73.85, 56.75], [-73.75, 56.5], [-73.85, 56.25], [-73.75, 56.0], [-73.97, 55.47], [-74.5, 55.25], [-75.03, 55.47], [-75.25, 56.0], [-75.15, 56.25], [-75.18, 56.32], [-75.25, 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"Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-28.82785580952961, -35.13168436686195, -37.64356587727863, -36.14487813313801]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.977265646597772, -6.852153486867197, -8.080587280344485, -7.507526347301095]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.316395991505004, -8.870320071441682, -11.019871678647661, -9.443688487558177]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.1830078053680273, -1.3361579580523386, -1.555760514837899, -1.4074451835492396]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.2161278132107163, -1.5382561795008352, -1.9606285541853268, -1.8117862308781707]}}