{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:56:32.010423", "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-Aug-18_to_2025-Aug-20_293.0_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": 2025080000591}, "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": "August 18 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 20 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 3}, "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": 132154.3229237047}, "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", "United States"]}, "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"]}, "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": 293.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "293.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 289.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 296.25}, "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": {"2025-08-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-70.65, 48.25], [-70.75, 48.5], [-70.53, 49.03], [-70.18, 49.18], [-70.03, 49.53], [-69.68, 49.68], [-69.53, 50.03], [-69.12, 50.2], [-69.25, 50.5], [-69.03, 51.03], [-68.68, 51.18], [-68.53, 51.53], [-68.18, 51.68], [-68.03, 52.03], [-67.5, 52.25], [-67.25, 52.15], [-67.0, 52.25], [-66.75, 52.15], [-66.5, 52.25], [-66.25, 52.15], [-66.0, 52.25], [-65.47, 52.03], [-65.32, 51.68], [-65.25, 51.65], [-65.0, 51.75], [-64.47, 51.53], [-64.25, 51.0], [-64.47, 50.47], [-65.0, 50.25], [-65.25, 50.35], [-65.32, 50.32], [-65.47, 49.97], [-66.0, 49.75], [-65.75, 49.65], [-65.5, 49.75], [-65.25, 49.65], [-65.0, 49.75], [-64.75, 49.65], [-64.5, 49.75], [-63.97, 49.53], [-63.75, 49.0], [-63.85, 48.75], [-63.75, 48.5], [-63.97, 47.97], [-64.37, 47.8], [-64.25, 47.5], [-64.35, 47.25], [-64.25, 47.0], [-64.35, 46.75], [-64.32, 46.68], [-63.97, 46.53], [-63.82, 46.18], [-63.47, 46.03], [-63.25, 45.5], [-63.47, 44.97], [-64.0, 44.75], [-64.53, 44.97], [-64.68, 45.32], [-64.75, 45.35], [-65.0, 45.25], [-65.53, 45.47], [-65.68, 45.82], [-66.03, 45.97], [-66.18, 46.32], [-66.53, 46.47], [-66.75, 47.0], [-66.65, 47.25], [-66.68, 47.32], [-66.75, 47.35], [-66.82, 47.32], [-66.97, 46.97], [-67.32, 46.82], [-67.47, 46.47], [-68.0, 46.25], [-68.53, 46.47], [-68.68, 46.82], [-69.03, 46.97], [-69.18, 47.32], [-69.3, 47.38], [-69.47, 46.97], [-70.0, 46.75], [-70.53, 46.97], [-70.75, 47.5], [-70.65, 47.75], [-70.75, 48.0], [-70.65, 48.25]], [[-66.25, 49.85], [-66.32, 49.82], [-66.37, 49.7], [-66.25, 49.65], [-66.0, 49.75], [-66.25, 49.85]]]]}, "2025-08-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-70.65, 48.25], [-70.75, 48.5], [-70.53, 49.03], [-70.18, 49.18], [-70.03, 49.53], [-69.68, 49.68], [-69.53, 50.03], [-69.12, 50.2], [-69.25, 50.5], [-69.03, 51.03], [-68.68, 51.18], [-68.53, 51.53], [-68.18, 51.68], [-68.03, 52.03], [-67.5, 52.25], [-67.25, 52.15], [-67.0, 52.25], [-66.75, 52.15], [-66.5, 52.25], [-66.25, 52.15], [-66.0, 52.25], [-65.47, 52.03], [-65.32, 51.68], [-65.25, 51.65], [-65.0, 51.75], [-64.47, 51.53], [-64.25, 51.0], [-64.47, 50.47], [-65.0, 50.25], [-65.25, 50.35], [-65.32, 50.32], [-65.47, 49.97], [-66.0, 49.75], [-65.75, 49.65], [-65.5, 49.75], [-65.25, 49.65], [-65.0, 49.75], [-64.75, 49.65], [-64.5, 49.75], [-63.97, 49.53], [-63.75, 49.0], [-63.85, 48.75], [-63.75, 48.5], [-63.97, 47.97], [-64.37, 47.8], [-64.25, 47.5], [-64.35, 47.25], [-64.25, 47.0], [-64.35, 46.75], [-64.32, 46.68], [-63.97, 46.53], [-63.82, 46.18], [-63.47, 46.03], [-63.25, 45.5], [-63.47, 44.97], [-64.0, 44.75], [-64.53, 44.97], [-64.68, 45.32], [-64.75, 45.35], [-65.0, 45.25], [-65.53, 45.47], [-65.68, 45.82], [-66.03, 45.97], [-66.18, 46.32], [-66.53, 46.47], [-66.75, 47.0], [-66.65, 47.25], [-66.68, 47.32], [-66.75, 47.35], [-66.82, 47.32], [-66.97, 46.97], [-67.32, 46.82], [-67.47, 46.47], [-68.0, 46.25], [-68.53, 46.47], [-68.68, 46.82], [-69.03, 46.97], [-69.18, 47.32], [-69.3, 47.38], [-69.47, 46.97], [-70.0, 46.75], [-70.53, 46.97], [-70.75, 47.5], [-70.65, 47.75], [-70.75, 48.0], [-70.65, 48.25]], [[-66.25, 49.85], [-66.32, 49.82], [-66.37, 49.7], [-66.25, 49.65], [-66.0, 49.75], [-66.25, 49.85]]]]}, "2025-08-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-70.65, 48.25], [-70.75, 48.5], [-70.53, 49.03], [-70.18, 49.18], [-70.03, 49.53], [-69.68, 49.68], [-69.53, 50.03], [-69.12, 50.2], [-69.25, 50.5], [-69.03, 51.03], [-68.68, 51.18], [-68.53, 51.53], [-68.18, 51.68], [-68.03, 52.03], [-67.5, 52.25], [-67.25, 52.15], [-67.0, 52.25], [-66.75, 52.15], [-66.5, 52.25], [-66.25, 52.15], [-66.0, 52.25], [-65.47, 52.03], [-65.32, 51.68], [-65.25, 51.65], [-65.0, 51.75], [-64.47, 51.53], [-64.25, 51.0], [-64.47, 50.47], [-65.0, 50.25], [-65.25, 50.35], [-65.32, 50.32], [-65.47, 49.97], [-66.0, 49.75], [-65.75, 49.65], [-65.5, 49.75], [-65.25, 49.65], [-65.0, 49.75], [-64.75, 49.65], [-64.5, 49.75], [-63.97, 49.53], [-63.75, 49.0], [-63.85, 48.75], [-63.75, 48.5], [-63.97, 47.97], [-64.37, 47.8], [-64.25, 47.5], [-64.35, 47.25], [-64.25, 47.0], [-64.35, 46.75], [-64.32, 46.68], [-63.97, 46.53], [-63.82, 46.18], [-63.47, 46.03], [-63.25, 45.5], [-63.47, 44.97], [-64.0, 44.75], [-64.53, 44.97], [-64.68, 45.32], [-64.75, 45.35], [-65.0, 45.25], [-65.53, 45.47], [-65.68, 45.82], [-66.03, 45.97], [-66.18, 46.32], [-66.53, 46.47], [-66.75, 47.0], [-66.65, 47.25], [-66.68, 47.32], [-66.75, 47.35], [-66.82, 47.32], [-66.97, 46.97], [-67.32, 46.82], [-67.47, 46.47], [-68.0, 46.25], [-68.53, 46.47], [-68.68, 46.82], [-69.03, 46.97], [-69.18, 47.32], [-69.3, 47.38], [-69.47, 46.97], [-70.0, 46.75], [-70.53, 46.97], [-70.75, 47.5], [-70.65, 47.75], [-70.75, 48.0], [-70.65, 48.25]], [[-66.25, 49.85], [-66.32, 49.82], [-66.37, 49.7], [-66.25, 49.65], [-66.0, 49.75], [-66.25, 49.85]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -6.658566353492404}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.389992440778406}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [11.579177895570467, 10.578017405974606, 11.943379680927023]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [6.350078837076865, 7.180815633138025, 8.262940979003929]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.239162527531584, -5.179019623530189, -3.751795171273451]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.769207520416501, -6.658566353492404, -5.0029422956123994]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.7105267123524481, -2.0753297436190996, -1.492787875199303]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.1725940704749984, -2.488254469394532, -1.8145951042143584]}}