{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 08:53:03.724176", "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": "2013-Apr-20_to_2013-Apr-23_278.0_32.0"}, "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": 2013040000770}, "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 20 2013"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 23 2013"}, "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": 74642.04660927692}, "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": ["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": 32.0}, "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": 282.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 31.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 36.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2013-04-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-83.25, 32.5], [-83.03, 33.03], [-82.5, 33.25], [-82.25, 33.15], [-82.0, 33.25], [-81.75, 33.15], [-81.5, 33.25], [-80.97, 33.03], [-80.82, 32.68], [-80.47, 32.53], [-80.25, 32.0], [-80.47, 31.47], [-81.0, 31.25], [-81.5, 31.46], [-81.82, 31.32], [-81.97, 30.97], [-82.5, 30.75], [-82.75, 30.85], [-83.0, 30.75], [-83.53, 30.97], [-83.75, 31.5], [-83.53, 32.03], [-83.18, 32.18], [-83.15, 32.25], [-83.25, 32.5]]]]}, "2013-04-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-83.25, 32.5], [-83.03, 33.03], [-82.5, 33.25], [-82.25, 33.15], [-82.0, 33.25], [-81.75, 33.15], [-81.5, 33.25], [-81.25, 33.15], [-81.18, 33.18], [-81.15, 33.25], [-81.25, 33.5], [-81.03, 34.03], [-80.68, 34.18], [-80.65, 34.25], [-80.75, 34.5], [-80.53, 35.03], [-80.0, 35.25], [-79.75, 35.15], [-79.5, 35.25], [-79.25, 35.15], [-79.0, 35.25], [-78.75, 35.15], [-78.68, 35.18], [-78.65, 35.25], [-78.75, 35.5], [-78.65, 35.75], [-78.75, 36.0], [-78.53, 36.53], [-78.0, 36.75], [-77.75, 36.65], [-77.5, 36.75], [-76.97, 36.53], [-76.75, 36.0], [-76.85, 35.75], [-76.75, 35.5], [-76.96, 35.0], [-76.75, 34.5], [-76.97, 33.97], [-77.5, 33.75], [-77.8, 33.88], [-77.97, 33.47], [-78.5, 33.25], [-78.75, 33.35], [-78.82, 33.32], [-78.97, 32.97], [-79.32, 32.82], [-79.47, 32.47], [-79.82, 32.32], [-79.97, 31.97], [-80.32, 31.82], [-80.47, 31.47], [-81.0, 31.25], [-81.5, 31.46], [-81.82, 31.32], [-81.97, 30.97], [-82.5, 30.75], [-82.75, 30.85], [-83.0, 30.75], [-83.53, 30.97], [-83.75, 31.5], [-83.53, 32.03], [-83.18, 32.18], [-83.15, 32.25], [-83.25, 32.5]]]]}, "2013-04-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-83.25, 32.5], [-83.03, 33.03], [-82.5, 33.25], [-82.25, 33.15], [-82.0, 33.25], [-81.75, 33.15], [-81.5, 33.25], [-81.25, 33.15], [-81.18, 33.18], [-81.15, 33.25], [-81.25, 33.5], [-81.03, 34.03], [-80.68, 34.18], [-80.65, 34.25], [-80.75, 34.5], [-80.53, 35.03], [-80.0, 35.25], [-79.75, 35.15], [-79.5, 35.25], [-79.25, 35.15], [-79.0, 35.25], [-78.75, 35.15], [-78.68, 35.18], [-78.65, 35.25], [-78.75, 35.5], [-78.65, 35.75], [-78.75, 36.0], [-78.53, 36.53], [-78.0, 36.75], [-77.75, 36.65], [-77.5, 36.75], [-76.97, 36.53], [-76.75, 36.0], [-76.85, 35.75], [-76.75, 35.5], [-76.96, 35.0], [-76.75, 34.5], [-76.97, 33.97], [-77.5, 33.75], [-77.8, 33.88], [-77.97, 33.47], [-78.5, 33.25], [-78.75, 33.35], [-78.82, 33.32], [-78.97, 32.97], [-79.32, 32.82], [-79.47, 32.47], [-79.82, 32.32], [-79.97, 31.97], [-80.32, 31.82], [-80.47, 31.47], [-81.0, 31.25], [-81.5, 31.46], [-81.82, 31.32], [-81.97, 30.97], [-82.5, 30.75], [-82.75, 30.85], [-83.0, 30.75], [-83.53, 30.97], [-83.75, 31.5], [-83.53, 32.03], [-83.18, 32.18], [-83.15, 32.25], [-83.25, 32.5]]]]}, "2013-04-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-83.03, 33.03], [-82.5, 33.25], [-82.25, 33.15], [-82.0, 33.25], [-81.75, 33.15], [-81.5, 33.25], [-81.25, 33.15], [-81.18, 33.18], [-81.15, 33.25], [-81.25, 33.5], [-81.03, 34.03], [-80.68, 34.18], [-80.65, 34.25], [-80.75, 34.5], [-80.53, 35.03], [-80.0, 35.25], [-79.75, 35.15], [-79.5, 35.25], [-79.25, 35.15], [-79.0, 35.25], [-78.75, 35.15], [-78.68, 35.18], [-78.65, 35.25], [-78.75, 35.5], [-78.65, 35.75], [-78.75, 36.0], [-78.53, 36.53], [-78.0, 36.75], [-77.75, 36.65], [-77.5, 36.75], [-76.97, 36.53], [-76.75, 36.0], [-76.85, 35.75], [-76.75, 35.5], [-76.96, 35.0], [-76.75, 34.5], [-76.97, 33.97], [-77.5, 33.75], [-77.8, 33.88], [-77.97, 33.47], [-78.5, 33.25], [-78.75, 33.35], [-78.82, 33.32], [-78.97, 32.97], [-79.32, 32.82], [-79.47, 32.47], [-79.82, 32.32], [-79.97, 31.97], [-80.32, 31.82], [-80.47, 31.47], [-81.0, 31.25], [-81.5, 31.46], [-82.0, 31.25], [-82.25, 31.35], [-82.5, 31.25], [-83.03, 31.47], [-83.25, 32.0], [-83.15, 32.25], [-83.25, 32.5], [-83.03, 33.03]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -8.435064777997638}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.315969006494401}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [14.15781075683509, 13.108060149105881, 13.217972706628927, 14.324603792992036]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [13.397182444237671, 11.026317260922951, 8.816610829968056, 11.897172259409842]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.353828495764645, -5.57799992324274, -5.681472250477212, -4.630733207406799]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.183154510171391, -6.361614284184725, -8.435064777997638, -5.398409622105532]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.7313809445536417, -1.6977722845442254, -1.7617003213225737, -1.4881632507231268]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.982505399653382, -1.9088801862508955, -2.279089957401214, -1.8821429620294012]}}