{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:05:03.078327", "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-May-18_to_2025-May-20_278.5_53.5"}, "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": 2025050000440}, "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": "May 18 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 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": 94161.41761931477}, "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"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["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": 53.5}, "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": 278.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "278.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 276.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 280.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 49.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 55.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-83.68, 53.18], [-83.53, 53.53], [-83.18, 53.68], [-83.15, 53.75], [-83.25, 54.0], [-83.15, 54.25], [-83.18, 54.32], [-83.53, 54.47], [-83.68, 54.82], [-84.03, 54.97], [-84.25, 55.5], [-84.03, 56.03], [-83.5, 56.25], [-82.97, 56.03], [-82.82, 55.68], [-82.75, 55.65], [-82.5, 55.75], [-82.25, 55.65], [-82.0, 55.75], [-81.47, 55.53], [-81.32, 55.18], [-80.97, 55.03], [-80.82, 54.68], [-80.47, 54.53], [-80.25, 54.0], [-80.35, 53.75], [-80.32, 53.68], [-79.97, 53.53], [-79.75, 53.0], [-79.85, 52.75], [-79.75, 52.5], [-79.85, 52.25], [-79.82, 52.18], [-79.47, 52.03], [-79.25, 51.5], [-79.35, 51.25], [-79.25, 51.0], [-79.47, 50.47], [-79.82, 50.32], [-79.97, 49.97], [-80.5, 49.75], [-81.0, 49.96], [-81.32, 49.82], [-81.47, 49.47], [-81.82, 49.32], [-81.97, 48.97], [-82.5, 48.75], [-83.03, 48.97], [-83.18, 49.32], [-83.53, 49.47], [-83.75, 50.0], [-83.53, 50.53], [-83.0, 50.75], [-82.75, 50.65], [-82.68, 50.68], [-82.65, 50.75], [-82.75, 51.0], [-82.65, 51.25], [-82.68, 51.32], [-83.0, 51.46], [-83.5, 51.25], [-84.03, 51.47], [-84.25, 52.0], [-84.15, 52.25], [-84.25, 52.5], [-84.03, 53.03], [-83.68, 53.18]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.E.North-America", "E.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-05-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-84.25, 52.5], [-84.02999999999997, 53.03], [-83.68, 53.18], [-83.52999999999997, 53.53], [-83.18, 53.68], [-83.14999999999998, 53.75], [-83.25, 54.0], [-83.14999999999998, 54.25], [-83.18, 54.32], [-83.52999999999997, 54.47], [-83.68, 54.82], [-84.02999999999997, 54.97], [-84.25, 55.5], [-84.02999999999997, 56.03], [-83.5, 56.25], [-82.97000000000003, 56.03], [-82.82, 55.68], [-82.75, 55.65], [-82.5, 55.75], [-82.25, 55.65], [-82.0, 55.75], [-81.47000000000003, 55.53], [-81.32, 55.18], [-80.97000000000003, 55.03], [-80.82, 54.68], [-80.47000000000003, 54.53], [-80.25, 54.0], [-80.35000000000002, 53.75], [-80.32, 53.68], 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anomaly recorded over entire duration", "value": -10.621078434735239}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -6.285929205382487}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-2.1056765747069903, -2.73296717325843, -0.8582042439778093]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-4.9774002075195085, -4.5402295430500885, -3.799991353352823]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-6.182022994549069, -7.145439788705304, -5.530324832893083]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-9.36740930320559, -10.621078434735239, -7.261394715587642]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.45433368514133, -1.6547973072322848, -1.3050971381625502]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.6798382845358144, -1.8719016726285111, -1.6011433991274906]}}