{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 08:48:22.893988", "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": "2011-Sep-15_to_2011-Sep-17_278.0_44.0"}, "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": 2011090000724}, "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": "September 15 2011"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 17 2011"}, "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": 80080.17953500012}, "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"]}, "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": []}, "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": 44.0}, "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": 278.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "278.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 276.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 283.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 42.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 45.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2011-09-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-82.5, 44.75], [-82.25, 44.65], [-82.18, 44.68], [-82.03, 45.03], [-81.5, 45.25], [-81.25, 45.15], [-81.0, 45.25], [-80.75, 45.15], [-80.5, 45.25], [-80.25, 45.15], [-80.18, 45.18], [-80.03, 45.53], [-79.5, 45.75], [-79.25, 45.65], [-79.18, 45.68], [-79.03, 46.03], [-78.5, 46.25], [-77.97, 46.03], [-77.75, 45.5], [-77.85, 45.25], [-77.75, 45.0], [-77.85, 44.75], [-77.82, 44.68], [-77.75, 44.65], [-77.5, 44.75], [-76.97, 44.53], [-76.82, 44.18], [-76.47, 44.03], [-76.25, 43.5], [-76.47, 42.97], [-77.0, 42.75], [-77.25, 42.85], [-77.5, 42.75], [-77.75, 42.85], [-78.0, 42.75], [-78.53, 42.97], [-78.68, 43.32], [-78.75, 43.35], [-79.0, 43.25], [-79.25, 43.35], [-79.32, 43.32], [-79.47, 42.97], [-79.82, 42.82], [-79.97, 42.47], [-80.5, 42.25], [-80.75, 42.35], [-81.0, 42.25], [-81.25, 42.35], [-81.5, 42.25], [-81.75, 42.35], [-82.0, 42.25], [-82.53, 42.47], [-82.68, 42.82], [-82.75, 42.85], [-83.0, 42.75], [-83.53, 42.97], [-83.75, 43.5], [-83.53, 44.03], [-83.18, 44.18], [-83.03, 44.53], [-82.5, 44.75]]]]}, "2011-09-16T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-82.5, 44.75], [-82.25, 44.65], [-82.18, 44.68], [-82.03, 45.03], [-81.5, 45.25], [-81.25, 45.15], [-81.0, 45.25], [-80.75, 45.15], [-80.5, 45.25], [-80.25, 45.15], [-80.18, 45.18], [-80.03, 45.53], [-79.5, 45.75], [-79.25, 45.65], [-79.18, 45.68], [-79.03, 46.03], [-78.5, 46.25], [-77.97, 46.03], [-77.75, 45.5], [-77.85, 45.25], [-77.75, 45.0], [-77.85, 44.75], [-77.82, 44.68], [-77.75, 44.65], [-77.5, 44.75], [-76.97, 44.53], [-76.82, 44.18], [-76.47, 44.03], [-76.25, 43.5], [-76.47, 42.97], [-77.0, 42.75], [-77.25, 42.85], [-77.5, 42.75], [-77.75, 42.85], [-78.0, 42.75], [-78.53, 42.97], [-78.68, 43.32], [-78.75, 43.35], [-79.0, 43.25], [-79.25, 43.35], [-79.32, 43.32], [-79.47, 42.97], [-79.82, 42.82], [-79.97, 42.47], [-80.5, 42.25], [-80.75, 42.35], [-81.0, 42.25], [-81.25, 42.35], [-81.5, 42.25], [-81.75, 42.35], [-82.0, 42.25], [-82.53, 42.47], [-82.68, 42.82], [-82.75, 42.85], [-83.0, 42.75], [-83.53, 42.97], [-83.75, 43.5], [-83.53, 44.03], [-83.18, 44.18], [-83.03, 44.53], [-82.5, 44.75]]]]}, "2011-09-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-82.5, 44.75], [-82.25, 44.65], [-82.18, 44.68], [-82.03, 45.03], [-81.5, 45.25], [-81.25, 45.15], [-81.0, 45.25], [-80.75, 45.15], [-80.5, 45.25], [-80.25, 45.15], [-80.18, 45.18], [-80.03, 45.53], [-79.5, 45.75], [-79.25, 45.65], [-79.18, 45.68], [-79.03, 46.03], [-78.5, 46.25], [-77.97, 46.03], [-77.75, 45.5], [-77.85, 45.25], [-77.75, 45.0], [-77.85, 44.75], [-77.82, 44.68], [-77.75, 44.65], [-77.5, 44.75], [-76.97, 44.53], [-76.82, 44.18], [-76.47, 44.03], [-76.25, 43.5], [-76.47, 42.97], [-77.0, 42.75], [-77.25, 42.85], [-77.5, 42.75], [-77.75, 42.85], [-78.0, 42.75], [-78.53, 42.97], [-78.68, 43.32], [-78.75, 43.35], [-79.0, 43.25], [-79.25, 43.35], [-79.32, 43.32], [-79.47, 42.97], [-79.82, 42.82], [-79.97, 42.47], [-80.5, 42.25], [-80.75, 42.35], [-81.0, 42.25], [-81.25, 42.35], [-81.5, 42.25], [-81.75, 42.35], [-82.0, 42.25], [-82.53, 42.47], [-82.68, 42.82], [-82.75, 42.85], [-83.0, 42.75], [-83.53, 42.97], [-83.75, 43.5], [-83.53, 44.03], [-83.18, 44.18], [-83.03, 44.53], [-82.5, 44.75]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -7.577984121559268}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.875200360553031}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [10.973254993135242, 9.715928230867235, 10.818336179010316]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [7.757831171381042, 5.5695617194731994, 7.644590624078035]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.581414289026118, -6.714228043348975, -5.329958749283999]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-7.283803706727099, -7.577984121559268, -6.650028047273963]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.7317830419073903, -2.0390480380864013, -1.5668854189459165]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.08471074892353, -2.2574050282380176, -1.8151635482073392]}}