{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 09:21:01.984015", "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": "2019-Dec-19_to_2019-Dec-21_287.0_44.5"}, "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": 2019120000523}, "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": "December 19 2019"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 21 2019"}, "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": 179924.25630471567}, "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": ["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": 44.5}, "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": 287.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "287.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 281.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 289.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 40.75}, "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": {"2019-12-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-78.53, 42.47], [-78.75, 43.0], [-78.53, 43.53], [-78.0, 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40.25], [-75.53, 40.47], [-75.75, 41.0], [-75.62, 41.3], [-75.75, 41.35], [-75.82, 41.32], [-75.97, 40.97], [-76.5, 40.75], [-77.03, 40.97], [-77.18, 41.32], [-77.53, 41.47], [-77.75, 42.0], [-77.65, 42.25], [-77.68, 42.32], [-77.75, 42.35], [-78.0, 42.25], [-78.53, 42.47]]]]}, "2019-12-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-78.53, 42.47], [-78.75, 43.0], [-78.53, 43.53], [-78.0, 43.75], [-77.75, 43.65], [-77.5, 43.75], [-77.25, 43.65], [-77.18, 43.68], [-77.03, 44.03], [-76.68, 44.18], [-76.54, 44.5], [-76.75, 45.0], [-76.65, 45.25], [-76.75, 45.5], [-76.53, 46.03], [-76.0, 46.25], [-75.75, 46.15], [-75.5, 46.25], [-75.25, 46.15], [-75.0, 46.25], [-74.75, 46.15], [-74.5, 46.25], [-73.97, 46.03], [-73.82, 45.68], [-73.75, 45.65], [-73.5, 45.75], [-73.25, 45.65], [-73.18, 45.68], [-73.03, 46.03], [-72.5, 46.25], [-72.25, 46.15], [-72.0, 46.25], [-71.47, 46.03], [-71.25, 45.5], [-71.35, 45.25], [-71.32, 45.18], [-70.97, 45.03], [-70.75, 44.5], [-70.87, 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[-77.75, 42.0], [-77.65, 42.25], [-77.68, 42.32], [-77.75, 42.35], [-78.0, 42.25], [-78.53, 42.47]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -14.486617217156692}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -9.25925433700775}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-13.542888082174954, -12.137964305745072, -11.098517701781702]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-20.826977004024144, -17.728900237936614, -16.517097598226826]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-10.37639915429612, -9.09954585136592, -8.301818005361204]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-14.486617217156692, -13.065079009021218, -11.203334652366436]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.9702258976059166, -1.7202830609891084, -1.5773450885810565]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.5608364078739405, -2.1199082568096044, -2.1357641241338703]}}