{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 09:10:37.396549", "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": "2018-Apr-08_to_2018-Apr-11_290.0_45.0"}, "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": 2018040000462}, "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": "April 08 2018"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 11 2018"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 4}, "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": 81329.39944482132}, "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": 45.0}, "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": 290.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "290.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 285.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 292.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 43.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 48.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2018-04-08T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-75.03, 45.47], [-75.25, 46.0], [-75.03, 46.53], [-74.5, 46.75], [-74.25, 46.65], [-74.0, 46.75], [-73.7, 46.62], [-73.53, 47.03], [-73.12, 47.2], [-73.18, 47.32], [-73.53, 47.47], [-73.75, 48.0], [-73.53, 48.53], [-73.0, 48.75], [-72.75, 48.65], [-72.5, 48.75], [-72.25, 48.65], [-72.18, 48.68], [-72.03, 49.03], [-71.5, 49.25], [-70.97, 49.03], [-70.75, 48.5], [-70.87, 48.2], [-70.47, 48.03], [-70.25, 47.5], [-70.35, 47.25], [-70.32, 47.18], [-69.97, 47.03], [-69.75, 46.5], [-69.85, 46.25], [-69.82, 46.18], [-69.75, 46.15], [-69.5, 46.25], [-69.0, 46.04], [-68.5, 46.25], [-68.25, 46.15], [-68.0, 46.25], [-67.47, 46.03], [-67.25, 45.5], [-67.47, 44.97], [-68.0, 44.75], [-68.25, 44.85], [-68.5, 44.75], [-69.0, 44.96], [-69.32, 44.82], [-69.47, 44.47], [-69.82, 44.32], [-69.97, 43.97], [-70.5, 43.75], [-70.75, 43.85], [-70.82, 43.82], [-70.97, 43.47], [-71.5, 43.25], [-72.03, 43.47], [-72.25, 44.0], [-72.03, 44.53], [-71.68, 44.68], [-71.54, 45.0], [-71.68, 45.32], [-72.03, 45.47], [-72.18, 45.82], [-72.25, 45.85], [-72.5, 45.75], [-72.75, 45.85], [-73.0, 45.75], [-73.3, 45.88], [-73.47, 45.47], [-74.0, 45.25], [-74.25, 45.35], [-74.5, 45.25], [-75.03, 45.47]]]]}, "2018-04-09T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-75.03, 45.47], [-75.25, 46.0], [-75.03, 46.53], [-74.5, 46.75], [-74.25, 46.65], [-74.0, 46.75], [-73.75, 46.65], [-73.68, 46.68], [-73.53, 47.03], [-73.12, 47.2], [-73.18, 47.32], [-73.53, 47.47], [-73.75, 48.0], [-73.53, 48.53], [-73.0, 48.75], [-72.75, 48.65], [-72.5, 48.75], [-72.25, 48.65], [-72.18, 48.68], [-72.03, 49.03], [-71.5, 49.25], [-70.97, 49.03], [-70.75, 48.5], [-70.87, 48.2], [-70.47, 48.03], [-70.25, 47.5], [-70.35, 47.25], [-70.32, 47.18], [-69.97, 47.03], [-69.75, 46.5], [-69.85, 46.25], [-69.82, 46.18], [-69.75, 46.15], [-69.68, 46.18], [-69.53, 46.53], [-69.0, 46.75], [-68.75, 46.65], [-68.5, 46.75], [-68.25, 46.65], [-68.0, 46.75], [-67.75, 46.65], [-67.5, 46.75], [-66.97, 46.53], [-66.75, 46.0], [-66.97, 45.47], [-67.32, 45.32], [-67.47, 44.97], [-68.0, 44.75], [-68.25, 44.85], [-68.5, 44.75], [-68.75, 44.85], [-68.82, 44.82], [-68.97, 44.47], [-69.5, 44.25], [-69.75, 44.35], [-69.82, 44.32], [-69.97, 43.97], [-70.5, 43.75], [-70.75, 43.85], [-70.82, 43.82], [-70.97, 43.47], [-71.5, 43.25], [-72.03, 43.47], [-72.25, 44.0], [-72.03, 44.53], [-71.68, 44.68], [-71.54, 45.0], [-71.68, 45.32], [-72.03, 45.47], [-72.18, 45.82], [-72.25, 45.85], [-72.5, 45.75], [-72.75, 45.85], [-72.82, 45.82], [-72.97, 45.47], [-73.5, 45.25], [-73.75, 45.35], [-74.0, 45.25], [-74.25, 45.35], [-74.5, 45.25], [-75.03, 45.47]]]]}, "2018-04-10T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-75.03, 45.47], [-75.25, 46.0], [-75.03, 46.53], [-74.5, 46.75], [-74.25, 46.65], [-74.0, 46.75], [-73.75, 46.65], [-73.68, 46.68], [-73.53, 47.03], [-73.12, 47.2], [-73.18, 47.32], [-73.53, 47.47], [-73.75, 48.0], [-73.53, 48.53], [-73.0, 48.75], [-72.75, 48.65], [-72.5, 48.75], [-72.25, 48.65], [-72.18, 48.68], [-72.03, 49.03], [-71.5, 49.25], [-70.97, 49.03], [-70.75, 48.5], [-70.87, 48.2], [-70.47, 48.03], [-70.25, 47.5], [-70.35, 47.25], [-70.32, 47.18], [-69.97, 47.03], [-69.75, 46.5], [-69.85, 46.25], [-69.82, 46.18], [-69.75, 46.15], [-69.68, 46.18], [-69.53, 46.53], [-69.0, 46.75], [-68.75, 46.65], [-68.5, 46.75], [-68.25, 46.65], [-68.0, 46.75], [-67.75, 46.65], [-67.5, 46.75], [-66.97, 46.53], [-66.75, 46.0], [-66.97, 45.47], [-67.32, 45.32], [-67.47, 44.97], [-68.0, 44.75], [-68.25, 44.85], [-68.5, 44.75], [-68.75, 44.85], [-68.82, 44.82], [-68.97, 44.47], [-69.5, 44.25], [-69.75, 44.35], [-69.82, 44.32], [-69.97, 43.97], [-70.5, 43.75], [-70.75, 43.85], [-70.82, 43.82], [-70.97, 43.47], [-71.5, 43.25], [-72.03, 43.47], [-72.25, 44.0], [-72.03, 44.53], [-71.68, 44.68], [-71.54, 45.0], [-71.68, 45.32], [-72.03, 45.47], [-72.18, 45.82], [-72.25, 45.85], [-72.5, 45.75], [-72.75, 45.85], [-72.82, 45.82], [-72.97, 45.47], [-73.5, 45.25], [-73.75, 45.35], [-74.0, 45.25], [-74.25, 45.35], [-74.5, 45.25], [-75.03, 45.47]]]]}, "2018-04-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-71.03, 45.53], [-70.5, 45.75], [-70.25, 45.65], [-70.0, 45.75], [-69.75, 45.65], [-69.68, 45.68], [-69.65, 45.75], [-69.75, 46.0], [-69.53, 46.53], [-69.0, 46.75], [-68.75, 46.65], [-68.5, 46.75], [-68.25, 46.65], [-68.0, 46.75], [-67.75, 46.65], [-67.5, 46.75], [-66.97, 46.53], [-66.75, 46.0], [-66.97, 45.47], [-67.32, 45.32], [-67.47, 44.97], [-68.0, 44.75], [-68.5, 44.96], [-68.82, 44.82], [-68.97, 44.47], [-69.5, 44.25], [-69.75, 44.35], [-70.0, 44.25], [-70.25, 44.35], [-70.32, 44.32], [-70.47, 43.97], [-70.82, 43.82], [-70.97, 43.47], [-71.5, 43.25], [-72.03, 43.47], [-72.25, 44.0], [-72.03, 44.53], [-71.68, 44.68], [-71.53, 45.03], [-71.18, 45.18], [-71.03, 45.53]]], [[[-74.03, 45.47], [-74.25, 46.0], [-74.03, 46.53], [-73.5, 46.75], [-72.97, 46.53], [-72.75, 46.0], [-72.97, 45.47], [-73.5, 45.25], [-74.03, 45.47]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -9.680762419393716}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -6.664051074393756}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-5.481367364962352, -6.981332191589047, -4.812573474723251, -1.4606111459760882]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-9.361231478850414, -12.236300963235522, -8.323103814850299, -2.8177119279062595]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-6.059191443452217, -8.15308506729446, -6.446534641891611, -4.2001328463972625]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-8.285931031256041, -9.680762419393716, -7.67637657645497, -5.522814342073502]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.506113220729594, -2.2208227406185777, -1.9040729903896927, -1.3302173747151358]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.8545726005821737, -2.489063061934628, -2.552064244501322, -1.5571794743404836]}}