{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:08:53.821922", "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-Nov-29_to_2025-Dec-01_255.0_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": 2025110000834}, "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": "November 29 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 01 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": 57710.24406585043}, "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"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["America", "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": 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": 255.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "255.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 252.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 256.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 47.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 49.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-108.53, 48.53], [-108.18, 48.68], [-108.03, 49.03], [-107.5, 49.25], [-107.25, 49.15], [-107.18, 49.18], [-107.03, 49.53], [-106.5, 49.75], [-106.25, 49.65], [-106.0, 49.75], [-105.75, 49.65], [-105.5, 49.75], [-105.25, 49.65], [-105.0, 49.75], [-104.75, 49.65], [-104.5, 49.75], [-103.97, 49.53], [-103.75, 49.0], [-103.85, 48.75], [-103.82, 48.68], [-103.47, 48.53], [-103.25, 48.0], [-103.35, 47.75], [-103.25, 47.5], [-103.47, 46.97], [-104.0, 46.75], [-104.25, 46.85], [-104.5, 46.75], [-104.75, 46.85], [-105.0, 46.75], [-105.25, 46.85], [-105.5, 46.75], [-105.75, 46.85], [-106.0, 46.75], [-106.25, 46.85], [-106.5, 46.75], [-107.0, 46.96], [-107.5, 46.75], [-108.03, 46.97], [-108.18, 47.32], [-108.53, 47.47], [-108.75, 48.0], [-108.53, 48.53]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.North-America", "C.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-11-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-108.53, 47.47], [-108.75, 48.0], [-108.53, 48.53], [-108.18, 48.68], [-108.03, 49.03], [-107.5, 49.25], [-107.25, 49.15], [-107.18, 49.18], [-107.03, 49.53], [-106.5, 49.75], [-106.25, 49.65], [-106.0, 49.75], [-105.75, 49.65], [-105.5, 49.75], [-105.25, 49.65], [-105.0, 49.75], [-104.75, 49.65], [-104.5, 49.75], [-103.97000000000003, 49.53], [-103.75, 49.0], [-103.85000000000002, 48.75], [-103.82, 48.68], [-103.47000000000003, 48.53], [-103.25, 48.0], [-103.35000000000002, 47.75], [-103.25, 47.5], [-103.47000000000003, 46.97], [-104.0, 46.75], [-104.25, 46.85], [-104.5, 46.75], [-104.75, 46.85], [-105.0, 46.75], [-105.25, 46.85], [-105.5, 46.75], [-105.75, 46.85], [-106.0, 46.75], [-106.25, 46.85], [-106.5, 46.75], [-107.0, 46.96], [-107.5, 46.75], [-108.03, 46.97], [-108.18, 47.32], [-108.53, 47.47]]]]}, "2025-11-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-108.53, 47.47], [-108.75, 48.0], [-108.53, 48.53], [-108.18, 48.68], [-108.03, 49.03], [-107.5, 49.25], [-107.25, 49.15], [-107.18, 49.18], [-107.03, 49.53], [-106.5, 49.75], [-106.25, 49.65], [-106.0, 49.75], [-105.75, 49.65], [-105.5, 49.75], [-105.25, 49.65], [-105.0, 49.75], [-104.75, 49.65], [-104.5, 49.75], [-103.97000000000003, 49.53], [-103.75, 49.0], [-103.85000000000002, 48.75], [-103.82, 48.68], [-103.47000000000003, 48.53], [-103.25, 48.0], [-103.35000000000002, 47.75], [-103.25, 47.5], [-103.47000000000003, 46.97], [-104.0, 46.75], [-104.25, 46.85], [-104.5, 46.75], [-104.75, 46.85], [-105.0, 46.75], [-105.25, 46.85], [-105.5, 46.75], [-105.75, 46.85], [-106.0, 46.75], [-106.25, 46.85], [-106.5, 46.75], [-107.0, 46.96], [-107.5, 46.75], [-108.03, 46.97], [-108.18, 47.32], [-108.53, 47.47]]]]}, "2025-12-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-108.53, 47.47], [-108.75, 48.0], [-108.53, 48.53], [-108.18, 48.68], [-108.03, 49.03], [-107.5, 49.25], [-107.25, 49.15], [-107.18, 49.18], [-107.03, 49.53], [-106.5, 49.75], [-106.25, 49.65], [-106.0, 49.75], [-105.75, 49.65], [-105.5, 49.75], [-105.25, 49.65], [-105.0, 49.75], [-104.75, 49.65], [-104.5, 49.75], [-103.97000000000003, 49.53], [-103.75, 49.0], [-103.85000000000002, 48.75], [-103.82, 48.68], [-103.47000000000003, 48.53], [-103.25, 48.0], [-103.35000000000002, 47.75], [-103.25, 47.5], [-103.47000000000003, 46.97], [-104.0, 46.75], [-104.25, 46.85], [-104.5, 46.75], [-104.75, 46.85], [-105.0, 46.75], [-105.25, 46.85], [-105.5, 46.75], [-105.75, 46.85], [-106.0, 46.75], [-106.25, 46.85], [-106.5, 46.75], [-107.0, 46.96], [-107.5, 46.75], [-108.03, 46.97], [-108.18, 47.32], [-108.53, 47.47]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -19.457428944927358}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -11.667493877615057}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-12.818293158213294, -19.733548863728828, -15.415405337015784]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-15.22154528299967, -25.14883969624836, -19.893445714314765]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-8.64402330153894, -15.438275639946827, -10.920182691359404]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-9.703827158656225, -19.457428944927358, -14.434070304575954]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5487588302816628, -2.8116234454579137, -1.9631766657381173]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.7455620599250934, -3.5905570674600606, -2.6544583086495757]}}