{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 08:54:23.745449", "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-Sep-17_to_2013-Sep-20_290.5_36.0"}, "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": 2013090000847}, "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 17 2013"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 20 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": 358135.74421626556}, "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", "N.Atlantic-Ocean"]}, "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": 36.0}, "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": 290.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "290.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 283.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 294.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 34.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 39.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2013-09-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-77.03, 36.47], [-77.25, 37.0], [-77.03, 37.53], [-76.5, 37.75], [-76.25, 37.65], [-76.18, 37.68], [-76.03, 38.03], [-75.68, 38.18], [-75.65, 38.25], [-75.75, 38.5], [-75.54, 39.0], [-75.75, 39.5], [-75.53, 40.03], [-75.0, 40.25], [-74.75, 40.15], [-74.5, 40.25], [-73.97, 40.03], [-73.82, 39.68], [-73.75, 39.65], [-73.5, 39.75], [-73.25, 39.65], [-73.0, 39.75], [-72.75, 39.65], [-72.5, 39.75], [-72.25, 39.65], [-72.0, 39.75], [-71.75, 39.65], [-71.5, 39.75], [-71.25, 39.65], [-71.0, 39.75], [-70.75, 39.65], [-70.5, 39.75], [-69.97, 39.53], [-69.82, 39.18], [-69.47, 39.03], [-69.3, 38.62], [-69.18, 38.68], [-69.03, 39.03], [-68.5, 39.25], [-68.25, 39.15], [-68.0, 39.25], [-67.75, 39.15], [-67.5, 39.25], [-67.25, 39.15], [-67.0, 39.25], [-66.47, 39.03], [-66.25, 38.5], [-66.35, 38.25], [-66.25, 38.0], [-66.35, 37.75], [-66.25, 37.5], [-66.37, 37.2], [-66.25, 37.15], [-66.0, 37.25], [-65.47, 37.03], [-65.25, 36.5], [-65.35, 36.25], [-65.25, 36.0], [-65.35, 35.75], [-65.25, 35.5], [-65.47, 34.97], [-66.0, 34.75], [-66.25, 34.85], [-66.5, 34.75], [-66.75, 34.85], [-67.0, 34.75], [-67.25, 34.85], [-67.5, 34.75], [-67.75, 34.85], [-67.82, 34.82], [-67.97, 34.47], [-68.5, 34.25], [-68.75, 34.35], [-69.0, 34.25], [-69.53, 34.47], [-69.68, 34.82], [-69.75, 34.85], [-70.0, 34.75], [-70.25, 34.85], [-70.32, 34.82], [-70.47, 34.47], [-71.0, 34.25], [-71.25, 34.35], [-71.5, 34.25], [-71.75, 34.35], [-72.0, 34.25], [-72.53, 34.47], [-72.68, 34.82], [-72.75, 34.85], [-72.82, 34.82], [-72.97, 34.47], [-73.5, 34.25], [-74.03, 34.47], [-74.25, 35.0], [-74.15, 35.25], [-74.2, 35.38], [-74.32, 35.32], [-74.47, 34.97], [-75.0, 34.75], [-75.25, 34.85], [-75.32, 34.82], [-75.47, 34.47], [-76.0, 34.25], [-76.53, 34.47], [-76.75, 35.0], [-76.53, 35.53], [-76.18, 35.68], [-76.15, 35.75], [-76.25, 36.0], [-76.15, 36.25], [-76.18, 36.32], [-76.25, 36.35], [-76.5, 36.25], [-77.03, 36.47]]]]}, "2013-09-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-76.53, 36.03], [-76.18, 36.18], [-76.15, 36.25], [-76.18, 36.32], [-76.25, 36.35], [-76.5, 36.25], [-77.03, 36.47], [-77.25, 37.0], [-77.03, 37.53], [-76.5, 37.75], [-76.25, 37.65], [-76.18, 37.68], [-76.03, 38.03], [-75.68, 38.18], [-75.65, 38.25], [-75.75, 38.5], [-75.54, 39.0], [-75.75, 39.5], [-75.53, 40.03], [-75.0, 40.25], [-74.75, 40.15], [-74.5, 40.25], [-73.97, 40.03], [-73.82, 39.68], [-73.75, 39.65], [-73.5, 39.75], [-73.25, 39.65], [-73.0, 39.75], [-72.75, 39.65], [-72.5, 39.75], [-72.25, 39.65], [-72.0, 39.75], [-71.75, 39.65], [-71.5, 39.75], [-71.25, 39.65], [-71.0, 39.75], [-70.75, 39.65], [-70.5, 39.75], [-69.97, 39.53], [-69.82, 39.18], [-69.47, 39.03], [-69.3, 38.62], [-69.18, 38.68], [-69.03, 39.03], [-68.5, 39.25], [-68.25, 39.15], [-68.0, 39.25], [-67.75, 39.15], [-67.5, 39.25], [-67.25, 39.15], [-67.0, 39.25], [-66.47, 39.03], [-66.25, 38.5], [-66.35, 38.25], [-66.25, 38.0], [-66.35, 37.75], [-66.25, 37.5], [-66.37, 37.2], [-66.25, 37.15], [-66.0, 37.25], [-65.47, 37.03], [-65.25, 36.5], [-65.35, 36.25], [-65.25, 36.0], [-65.35, 35.75], [-65.25, 35.5], [-65.47, 34.97], [-66.0, 34.75], [-66.25, 34.85], [-66.5, 34.75], [-66.75, 34.85], [-67.0, 34.75], [-67.25, 34.85], [-67.5, 34.75], [-67.75, 34.85], [-67.82, 34.82], [-67.97, 34.47], [-68.5, 34.25], [-68.75, 34.35], [-69.0, 34.25], [-69.53, 34.47], [-69.68, 34.82], [-69.75, 34.85], [-70.0, 34.75], [-70.25, 34.85], [-70.32, 34.82], [-70.47, 34.47], [-71.0, 34.25], [-71.25, 34.35], [-71.32, 34.32], [-71.47, 33.97], [-72.0, 33.75], [-72.25, 33.85], [-72.5, 33.75], [-73.03, 33.97], [-73.2, 34.38], [-73.5, 34.25], [-74.03, 34.47], [-74.25, 35.0], [-74.15, 35.25], [-74.2, 35.38], [-74.32, 35.32], [-74.47, 34.97], [-75.0, 34.75], [-75.25, 34.85], [-75.32, 34.82], [-75.47, 34.47], [-76.0, 34.25], [-76.53, 34.47], [-76.75, 35.0], [-76.65, 35.25], [-76.75, 35.5], [-76.53, 36.03]]]]}, "2013-09-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-76.53, 36.03], [-76.18, 36.18], [-76.15, 36.25], [-76.18, 36.32], [-76.25, 36.35], [-76.5, 36.25], [-77.03, 36.47], [-77.25, 37.0], [-77.03, 37.53], [-76.5, 37.75], [-76.25, 37.65], [-76.18, 37.68], [-76.03, 38.03], [-75.68, 38.18], [-75.65, 38.25], [-75.75, 38.5], [-75.54, 39.0], [-75.75, 39.5], [-75.53, 40.03], [-75.0, 40.25], [-74.75, 40.15], [-74.5, 40.25], [-73.97, 40.03], [-73.82, 39.68], [-73.75, 39.65], [-73.5, 39.75], [-73.25, 39.65], [-73.0, 39.75], [-72.75, 39.65], [-72.5, 39.75], [-72.25, 39.65], [-72.0, 39.75], [-71.75, 39.65], [-71.5, 39.75], [-71.25, 39.65], [-71.0, 39.75], [-70.75, 39.65], [-70.5, 39.75], [-69.97, 39.53], [-69.82, 39.18], [-69.47, 39.03], [-69.3, 38.62], [-69.18, 38.68], [-69.03, 39.03], [-68.5, 39.25], [-68.25, 39.15], [-68.0, 39.25], [-67.75, 39.15], [-67.5, 39.25], [-67.25, 39.15], [-67.0, 39.25], [-66.47, 39.03], [-66.25, 38.5], [-66.35, 38.25], [-66.25, 38.0], [-66.35, 37.75], [-66.25, 37.5], [-66.37, 37.2], [-66.25, 37.15], [-66.0, 37.25], [-65.47, 37.03], [-65.25, 36.5], [-65.35, 36.25], [-65.25, 36.0], [-65.35, 35.75], [-65.25, 35.5], [-65.47, 34.97], [-66.0, 34.75], [-66.25, 34.85], [-66.5, 34.75], [-66.75, 34.85], [-67.0, 34.75], [-67.25, 34.85], [-67.5, 34.75], [-67.75, 34.85], [-67.82, 34.82], [-67.97, 34.47], [-68.5, 34.25], [-68.75, 34.35], [-69.0, 34.25], [-69.53, 34.47], [-69.68, 34.82], [-69.75, 34.85], [-70.0, 34.75], [-70.25, 34.85], [-70.32, 34.82], [-70.47, 34.47], [-71.0, 34.25], [-71.25, 34.35], [-71.32, 34.32], [-71.47, 33.97], [-72.0, 33.75], [-72.25, 33.85], [-72.5, 33.75], [-73.03, 33.97], [-73.2, 34.38], [-73.5, 34.25], [-74.03, 34.47], [-74.25, 35.0], [-74.15, 35.25], [-74.2, 35.38], [-74.32, 35.32], [-74.47, 34.97], [-75.0, 34.75], [-75.25, 34.85], [-75.32, 34.82], [-75.47, 34.47], [-76.0, 34.25], [-76.53, 34.47], [-76.75, 35.0], [-76.65, 35.25], [-76.75, 35.5], [-76.53, 36.03]]]]}, "2013-09-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-73.25, 34.5], [-73.03, 35.03], [-72.5, 35.25], [-72.25, 35.15], [-72.0, 35.25], [-71.47, 35.03], [-71.25, 34.5], [-71.47, 33.97], [-72.0, 33.75], [-72.25, 33.85], [-72.5, 33.75], [-73.03, 33.97], [-73.25, 34.5]]], [[[-76.53, 34.97], [-76.75, 35.5], [-76.53, 36.03], [-76.0, 36.25], [-75.47, 36.03], [-75.25, 35.5], [-75.47, 34.97], [-76.0, 34.75], [-76.53, 34.97]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -7.212095631557531}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.0747357149506236}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [21.07721270655594, 19.693844199517855, 20.730728462675188, 21.832013522451575]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [14.779078343029767, 13.024373766171209, 15.68900028249891, 19.488454855535906]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.6314713864041863, -3.8858881187857683, -2.7140158268822496, -2.2850090040880673]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.777697408166659, -7.212095631557531, -4.4258743464378085, -3.1882878281388116]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.8359025183461632, -2.631086734544361, -1.7410761484983492, -1.6056763027608165]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.407878724089993, -3.142027348266772, -2.0070126458962347, -1.7030022668197882]}}