{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 09:09:39.439656", "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": "2017-Dec-13_to_2017-Dec-15_283.5_42.5"}, "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": 2017120000489}, "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 13 2017"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 15 2017"}, "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": 80088.5566774919}, "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": ["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": 42.5}, "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": 283.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "283.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 278.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 285.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 41.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 43.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2017-12-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-81.53, 42.53], [-81.0, 42.75], [-80.75, 42.65], [-80.5, 42.75], [-80.25, 42.65], [-80.0, 42.75], [-79.75, 42.65], [-79.68, 42.68], [-79.65, 42.75], [-79.75, 43.0], [-79.53, 43.53], [-79.0, 43.75], [-78.75, 43.65], [-78.5, 43.75], [-78.25, 43.65], [-78.0, 43.75], [-77.75, 43.65], [-77.5, 43.75], [-77.25, 43.65], [-77.0, 43.75], [-76.75, 43.65], [-76.5, 43.75], [-76.25, 43.65], [-76.0, 43.75], [-75.47, 43.53], [-75.32, 43.18], [-75.25, 43.15], [-75.0, 43.25], [-74.47, 43.03], [-74.25, 42.5], [-74.35, 42.25], [-74.25, 42.0], [-74.47, 41.47], [-75.0, 41.25], [-75.25, 41.35], [-75.5, 41.25], [-75.75, 41.35], [-76.0, 41.25], [-76.25, 41.35], [-76.5, 41.25], [-76.75, 41.35], [-77.0, 41.25], [-77.25, 41.35], [-77.5, 41.25], [-77.75, 41.35], [-77.82, 41.32], [-77.97, 40.97], [-78.5, 40.75], [-78.75, 40.85], [-79.0, 40.75], [-79.25, 40.85], [-79.5, 40.75], [-79.75, 40.85], [-80.0, 40.75], [-80.25, 40.85], [-80.5, 40.75], [-80.75, 40.85], [-81.0, 40.75], [-81.53, 40.97], [-81.75, 41.5], [-81.65, 41.75], [-81.75, 42.0], [-81.53, 42.53]]]]}, "2017-12-14T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-81.53, 42.53], [-81.0, 42.75], [-80.75, 42.65], [-80.5, 42.75], [-80.25, 42.65], [-80.0, 42.75], [-79.75, 42.65], [-79.68, 42.68], [-79.65, 42.75], [-79.75, 43.0], [-79.53, 43.53], [-79.0, 43.75], [-78.75, 43.65], [-78.5, 43.75], [-78.25, 43.65], [-78.0, 43.75], [-77.75, 43.65], [-77.5, 43.75], [-77.25, 43.65], [-77.0, 43.75], [-76.75, 43.65], [-76.5, 43.75], [-76.25, 43.65], [-76.0, 43.75], [-75.47, 43.53], [-75.32, 43.18], [-75.25, 43.15], [-75.0, 43.25], [-74.47, 43.03], [-74.25, 42.5], [-74.35, 42.25], [-74.25, 42.0], [-74.47, 41.47], [-75.0, 41.25], [-75.25, 41.35], [-75.5, 41.25], [-75.75, 41.35], [-76.0, 41.25], [-76.25, 41.35], [-76.5, 41.25], [-76.75, 41.35], [-77.0, 41.25], [-77.25, 41.35], [-77.5, 41.25], [-77.75, 41.35], [-77.82, 41.32], [-77.97, 40.97], [-78.5, 40.75], [-78.75, 40.85], [-79.0, 40.75], [-79.25, 40.85], [-79.5, 40.75], [-79.75, 40.85], [-80.0, 40.75], [-80.25, 40.85], [-80.5, 40.75], [-80.75, 40.85], [-81.0, 40.75], [-81.53, 40.97], [-81.75, 41.5], [-81.65, 41.75], [-81.75, 42.0], [-81.53, 42.53]]]]}, "2017-12-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-81.53, 42.53], [-81.0, 42.75], [-80.75, 42.65], [-80.5, 42.75], [-80.25, 42.65], [-80.0, 42.75], [-79.75, 42.65], [-79.68, 42.68], [-79.65, 42.75], [-79.75, 43.0], [-79.53, 43.53], [-79.0, 43.75], [-78.75, 43.65], [-78.5, 43.75], [-78.25, 43.65], [-78.0, 43.75], [-77.75, 43.65], [-77.5, 43.75], [-77.25, 43.65], [-77.0, 43.75], [-76.75, 43.65], [-76.5, 43.75], [-76.25, 43.65], [-76.0, 43.75], [-75.47, 43.53], [-75.32, 43.18], [-75.25, 43.15], [-75.0, 43.25], [-74.47, 43.03], [-74.25, 42.5], [-74.35, 42.25], [-74.25, 42.0], [-74.47, 41.47], [-75.0, 41.25], [-75.25, 41.35], [-75.5, 41.25], [-75.75, 41.35], [-76.0, 41.25], [-76.25, 41.35], [-76.5, 41.25], [-76.75, 41.35], [-77.0, 41.25], [-77.25, 41.35], [-77.5, 41.25], [-77.75, 41.35], [-77.82, 41.32], [-77.97, 40.97], [-78.5, 40.75], [-78.75, 40.85], [-79.0, 40.75], [-79.25, 40.85], [-79.5, 40.75], [-79.75, 40.85], [-80.0, 40.75], [-80.25, 40.85], [-80.5, 40.75], [-80.75, 40.85], [-81.0, 40.75], [-81.53, 40.97], [-81.75, 41.5], [-81.65, 41.75], [-81.75, 42.0], [-81.53, 42.53]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -10.761473841033705}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -8.66653035805141}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-9.515177890696464, -9.014819783212317, -10.04968822417294]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-11.602991837787556, -11.987145858674637, -12.899847571838563]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-8.754090349757988, -8.165095192297944, -9.080405532098302]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-9.882242953334696, -9.939469991888473, -10.761473841033705]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.7755791659162647, -1.6417084657040546, -1.8391267459306762]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.931449826764244, -1.8958538346959832, -2.192942664877921]}}