{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:59:16.278263", "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-21_to_2026-Apr-24_302.0_48.5"}, "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": 2026040000569}, "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 21 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 24 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": 230601.5259223269}, "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": ["E.North-America", "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": ["Gulf of St. Lawrence", "North Atlantic Ocean"]}, "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": 48.5}, "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": 302.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "302.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 294.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 305.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 45.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 51.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-04-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-65.75, 51.0], [-65.53, 51.53], [-65.18, 51.68], [-65.03, 52.03], [-64.5, 52.25], [-64.25, 52.15], [-64.0, 52.25], [-63.75, 52.15], [-63.5, 52.25], [-63.25, 52.15], [-63.0, 52.25], [-62.75, 52.15], [-62.5, 52.25], [-61.97, 52.03], [-61.82, 51.68], [-61.75, 51.65], [-61.5, 51.75], [-61.25, 51.65], [-61.0, 51.75], [-60.47, 51.53], [-60.25, 51.0], [-60.37, 50.7], [-59.97, 50.53], [-59.82, 50.18], [-59.47, 50.03], [-59.32, 49.68], [-59.25, 49.65], [-59.0, 49.75], [-58.75, 49.65], [-58.5, 49.75], [-58.25, 49.65], [-58.0, 49.75], [-57.47, 49.53], [-57.25, 49.0], [-57.35, 48.75], [-57.25, 48.5], [-57.35, 48.25], [-57.25, 48.0], [-57.47, 47.47], [-58.0, 47.25], [-58.25, 47.35], [-58.37, 47.3], [-58.32, 47.18], [-57.97, 47.03], [-57.75, 46.5], [-57.85, 46.25], [-57.82, 46.18], [-57.47, 46.03], [-57.25, 45.5], [-57.47, 44.97], [-58.0, 44.75], [-58.25, 44.85], [-58.5, 44.75], [-58.75, 44.85], [-59.0, 44.75], [-59.25, 44.85], [-59.5, 44.75], [-60.03, 44.97], [-60.18, 45.32], [-60.53, 45.47], [-60.75, 46.0], [-60.57, 46.43], [-61.0, 46.25], [-61.5, 46.46], [-62.0, 46.25], [-62.25, 46.35], [-62.5, 46.25], [-62.75, 46.35], [-63.0, 46.25], [-63.25, 46.35], [-63.5, 46.25], [-64.03, 46.47], [-64.18, 46.82], [-64.53, 46.97], [-64.75, 47.5], [-64.65, 47.75], [-64.75, 48.0], [-64.53, 48.53], [-64.0, 48.75], [-64.53, 48.97], [-64.75, 49.5], [-64.62, 49.8], [-65.03, 49.97], [-65.18, 50.32], [-65.53, 50.47], [-65.75, 51.0]], [[-63.75, 48.65], [-63.5, 48.75], [-63.75, 48.85], [-64.0, 48.75], [-63.75, 48.65]], [[-63.25, 48.65], [-63.18, 48.68], [-63.15, 48.75], [-63.18, 48.82], [-63.25, 48.85], [-63.5, 48.75], [-63.25, 48.65]], [[-60.18, 46.82], [-60.25, 46.85], [-60.32, 46.82], [-60.43, 46.57], [-60.18, 46.68], [-60.15, 46.75], [-60.18, 46.82]]]]}, "2026-04-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-65.75, 51.0], [-65.53, 51.53], [-65.18, 51.68], [-65.03, 52.03], [-64.5, 52.25], [-64.25, 52.15], [-64.0, 52.25], [-63.75, 52.15], [-63.5, 52.25], [-63.25, 52.15], [-63.0, 52.25], [-62.75, 52.15], [-62.5, 52.25], [-61.97, 52.03], [-61.82, 51.68], [-61.75, 51.65], [-61.5, 51.75], [-61.25, 51.65], [-61.0, 51.75], [-60.47, 51.53], [-60.25, 51.0], [-60.37, 50.7], [-59.97, 50.53], [-59.82, 50.18], [-59.47, 50.03], [-59.32, 49.68], [-59.25, 49.65], [-59.0, 49.75], [-58.75, 49.65], [-58.5, 49.75], [-58.25, 49.65], [-58.18, 49.68], [-58.03, 50.03], [-57.5, 50.25], [-57.25, 50.15], [-57.0, 50.25], [-56.75, 50.15], [-56.5, 50.25], [-55.97, 50.03], [-55.82, 49.68], [-55.75, 49.65], [-55.5, 49.75], [-55.25, 49.65], [-55.0, 49.75], [-54.47, 49.53], [-54.25, 49.0], [-54.35, 48.75], [-54.25, 48.5], [-54.47, 47.97], [-54.82, 47.82], [-54.97, 47.47], [-55.5, 47.25], [-55.75, 47.35], [-56.0, 47.25], [-56.25, 47.35], [-56.5, 47.25], [-56.75, 47.35], [-57.0, 47.25], [-57.25, 47.35], [-57.5, 47.25], [-57.75, 47.35], [-58.0, 47.25], [-58.25, 47.35], [-58.37, 47.3], [-58.32, 47.18], [-57.97, 47.03], [-57.75, 46.5], [-57.85, 46.25], [-57.82, 46.18], [-57.47, 46.03], [-57.25, 45.5], [-57.47, 44.97], [-58.0, 44.75], [-58.25, 44.85], [-58.5, 44.75], [-58.75, 44.85], [-59.0, 44.75], [-59.25, 44.85], [-59.5, 44.75], [-60.03, 44.97], [-60.18, 45.32], [-60.53, 45.47], [-60.75, 46.0], [-60.57, 46.43], [-61.0, 46.25], [-61.5, 46.46], [-62.0, 46.25], [-62.25, 46.35], [-62.5, 46.25], [-62.75, 46.35], [-63.0, 46.25], [-63.25, 46.35], [-63.5, 46.25], [-64.03, 46.47], [-64.18, 46.82], [-64.53, 46.97], [-64.75, 47.5], [-64.65, 47.75], [-64.75, 48.0], [-64.53, 48.53], [-64.0, 48.75], [-64.53, 48.97], [-64.75, 49.5], [-64.62, 49.8], [-65.03, 49.97], [-65.18, 50.32], [-65.53, 50.47], [-65.75, 51.0]], [[-63.75, 48.65], [-63.5, 48.75], [-63.75, 48.85], [-64.0, 48.75], [-63.75, 48.65]], [[-63.25, 48.65], [-63.18, 48.68], [-63.15, 48.75], [-63.18, 48.82], [-63.25, 48.85], [-63.5, 48.75], [-63.25, 48.65]], [[-60.18, 46.82], [-60.25, 46.85], [-60.32, 46.82], [-60.43, 46.57], [-60.18, 46.68], [-60.15, 46.75], [-60.18, 46.82]]]]}, "2026-04-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-65.75, 51.0], [-65.53, 51.53], [-65.18, 51.68], [-65.03, 52.03], [-64.5, 52.25], [-64.25, 52.15], [-64.0, 52.25], [-63.75, 52.15], [-63.5, 52.25], [-63.25, 52.15], [-63.0, 52.25], [-62.75, 52.15], [-62.5, 52.25], [-61.97, 52.03], [-61.82, 51.68], [-61.75, 51.65], [-61.5, 51.75], [-61.25, 51.65], [-61.0, 51.75], [-60.47, 51.53], [-60.25, 51.0], [-60.37, 50.7], [-59.97, 50.53], [-59.82, 50.18], [-59.47, 50.03], [-59.32, 49.68], [-59.25, 49.65], [-59.0, 49.75], [-58.75, 49.65], [-58.5, 49.75], [-58.25, 49.65], [-58.18, 49.68], [-58.03, 50.03], [-57.5, 50.25], [-57.25, 50.15], [-57.0, 50.25], [-56.75, 50.15], [-56.5, 50.25], [-55.97, 50.03], [-55.82, 49.68], [-55.75, 49.65], [-55.5, 49.75], [-55.25, 49.65], [-55.0, 49.75], [-54.47, 49.53], [-54.25, 49.0], [-54.35, 48.75], [-54.25, 48.5], [-54.47, 47.97], [-54.82, 47.82], [-54.97, 47.47], [-55.5, 47.25], [-55.75, 47.35], [-56.0, 47.25], [-56.25, 47.35], [-56.5, 47.25], [-56.75, 47.35], [-57.0, 47.25], [-57.25, 47.35], [-57.5, 47.25], [-57.75, 47.35], [-58.0, 47.25], [-58.25, 47.35], [-58.37, 47.3], [-58.32, 47.18], [-57.97, 47.03], [-57.75, 46.5], [-57.85, 46.25], [-57.82, 46.18], [-57.47, 46.03], [-57.25, 45.5], [-57.47, 44.97], [-58.0, 44.75], [-58.25, 44.85], [-58.5, 44.75], [-58.75, 44.85], [-59.0, 44.75], [-59.25, 44.85], [-59.5, 44.75], [-60.03, 44.97], [-60.18, 45.32], [-60.53, 45.47], [-60.75, 46.0], [-60.57, 46.43], [-61.0, 46.25], [-61.5, 46.46], [-62.0, 46.25], [-62.25, 46.35], [-62.5, 46.25], [-62.75, 46.35], [-63.0, 46.25], [-63.25, 46.35], [-63.5, 46.25], [-64.03, 46.47], [-64.18, 46.82], [-64.53, 46.97], [-64.75, 47.5], [-64.65, 47.75], [-64.75, 48.0], [-64.53, 48.53], [-64.0, 48.75], [-64.53, 48.97], [-64.75, 49.5], [-64.62, 49.8], [-65.03, 49.97], [-65.18, 50.32], [-65.53, 50.47], [-65.75, 51.0]], [[-63.75, 48.65], [-63.5, 48.75], [-63.75, 48.85], [-64.0, 48.75], [-63.75, 48.65]], [[-63.25, 48.65], [-63.18, 48.68], [-63.15, 48.75], [-63.18, 48.82], [-63.25, 48.85], [-63.5, 48.75], [-63.25, 48.65]], [[-60.18, 46.82], [-60.25, 46.85], [-60.32, 46.82], [-60.43, 46.57], [-60.18, 46.68], [-60.15, 46.75], [-60.18, 46.82]]]]}, "2026-04-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-61.97, 48.03], [-61.75, 47.5], [-61.85, 47.25], [-61.75, 47.0], [-61.97, 46.47], [-62.5, 46.25], [-62.75, 46.35], [-63.0, 46.25], [-63.53, 46.47], [-63.75, 47.0], [-63.53, 47.53], [-63.18, 47.68], [-63.03, 48.03], [-62.5, 48.25], [-61.97, 48.03]]], [[[-61.25, 47.5], [-61.03, 48.03], [-60.5, 48.25], [-60.25, 48.15], [-60.18, 48.18], [-60.03, 48.53], [-59.5, 48.75], [-59.25, 48.65], [-59.18, 48.68], [-59.15, 48.75], [-59.25, 49.0], [-59.03, 49.53], [-58.5, 49.75], [-58.25, 49.65], [-58.18, 49.68], [-58.03, 50.03], [-57.5, 50.25], [-57.25, 50.15], [-57.0, 50.25], [-56.75, 50.15], [-56.5, 50.25], [-55.97, 50.03], [-55.82, 49.68], [-55.75, 49.65], [-55.5, 49.75], [-55.25, 49.65], [-55.0, 49.75], [-54.47, 49.53], [-54.25, 49.0], [-54.35, 48.75], [-54.25, 48.5], [-54.47, 47.97], [-54.82, 47.82], [-54.97, 47.47], [-55.5, 47.25], [-55.75, 47.35], [-56.0, 47.25], [-56.25, 47.35], [-56.5, 47.25], [-56.75, 47.35], [-57.0, 47.25], [-57.25, 47.35], [-57.5, 47.25], [-57.75, 47.35], [-58.0, 47.25], [-58.25, 47.35], [-58.5, 47.25], [-58.75, 47.35], [-58.87, 47.3], [-58.75, 47.0], [-58.85, 46.75], [-58.75, 46.5], [-58.85, 46.25], [-58.75, 46.0], [-58.97, 45.47], [-59.5, 45.25], [-60.03, 45.47], [-60.25, 46.0], [-60.15, 46.25], [-60.25, 46.5], [-60.15, 46.75], [-60.18, 46.82], [-60.25, 46.85], [-60.5, 46.75], [-61.03, 46.97], [-61.25, 47.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -9.056090068165133}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.7008660533876307}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-2.998949623791475, -2.895015839208213, -1.870555004468713, -1.7181652492946569]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-11.171605173746741, -9.363682810465491, -6.848207855224587, -4.312050882975257]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.900164307155577, -4.062363411941384, -3.159462016396724, -3.750719305137044]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-9.056090068165133, -7.71892566621483, -5.57726447209177, -5.464341222128496]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.843368489323047, -1.7899189001185827, -1.4267077533132593, -1.4443542324112524]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.536566110938773, -2.7017152519797447, -1.8515893398934136, -1.9652972998390446]}}