{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:16:13.824063", "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": "2021-Dec-19_to_2021-Dec-23_47.0_63.5"}, "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": 2021120000762}, "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 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 23 2021"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 5}, "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": 189466.9977154631}, "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": ["Russian Federation"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Europe"]}, "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": 63.5}, "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": 47.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "47.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 35.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 47.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 58.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 64.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[35.5, 60.25], [35.75, 60.15], [35.82, 60.18], [35.97, 60.53], [36.5, 60.75], [36.75, 60.65], [36.82, 60.68], [36.97, 61.03], [37.5, 61.25], [37.75, 61.15], [38.0, 61.25], [38.25, 61.15], [38.5, 61.25], [38.75, 61.15], [38.82, 61.18], [38.85, 61.25], [38.75, 61.5], [38.97, 62.03], [39.5, 62.25], [39.75, 62.15], [40.0, 62.25], [40.25, 62.15], [40.32, 62.18], [40.47, 62.53], [41.0, 62.75], [41.43, 62.57], [41.25, 63.0], [41.35, 63.25], [41.25, 63.5], [41.47, 64.03], [41.82, 64.18], [41.85, 64.25], [41.75, 64.5], [41.97, 65.03], [42.5, 65.25], [42.75, 65.15], [43.0, 65.25], [43.25, 65.15], [43.5, 65.25], [43.75, 65.15], [44.0, 65.25], [44.25, 65.15], [44.5, 65.25], [44.75, 65.15], [45.0, 65.25], [45.25, 65.15], [45.5, 65.25], [45.75, 65.15], [46.0, 65.25], [46.53, 65.03], [46.68, 64.68], [46.75, 64.65], [47.0, 64.75], [47.25, 64.65], [47.5, 64.75], [48.03, 64.53], [48.25, 64.0], [48.15, 63.75], [48.25, 63.5], [48.04, 63.0], [48.25, 62.5], [48.03, 61.97], [47.5, 61.75], [47.25, 61.85], [47.0, 61.75], [46.75, 61.85], [46.5, 61.75], [46.0, 61.96], [45.5, 61.75], [45.25, 61.85], [45.18, 61.82], [45.15, 61.75], [45.25, 61.5], [45.03, 60.97], [44.68, 60.82], [44.53, 60.47], [44.18, 60.32], [44.03, 59.97], [43.5, 59.75], [43.25, 59.85], [43.18, 59.82], [43.03, 59.47], [42.5, 59.25], [42.25, 59.35], [42.18, 59.32], [42.03, 58.97], [41.5, 58.75], [41.25, 58.85], [41.0, 58.75], [40.75, 58.85], [40.5, 58.75], [40.25, 58.85], [40.0, 58.75], [39.75, 58.85], [39.5, 58.75], [39.25, 58.85], [39.18, 58.82], [39.15, 58.75], [39.25, 58.5], [39.03, 57.97], [38.5, 57.75], [38.25, 57.85], [38.0, 57.75], [37.75, 57.85], [37.5, 57.75], [37.25, 57.85], [37.0, 57.75], [36.47, 57.97], [36.32, 58.32], [36.25, 58.35], [36.0, 58.25], [35.47, 58.47], [35.32, 58.82], [34.97, 58.97], [34.75, 59.5], [34.97, 60.03], [35.5, 60.25]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.Europe", "West&Central-Europe", "E.Europe", "Russian-Arctic"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-12-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[42.5, 63.75], [41.97, 63.97], [41.75, 64.5], [41.97, 65.03], [42.5, 65.25], [42.75, 65.15], [43.0, 65.25], [43.25, 65.15], [43.5, 65.25], [43.75, 65.15], [44.0, 65.25], [44.25, 65.15], [44.5, 65.25], [44.75, 65.15], [45.0, 65.25], [45.25, 65.15], [45.5, 65.25], [45.75, 65.15], [46.0, 65.25], [46.53, 65.03], [46.68, 64.68], [46.75, 64.65], [47.0, 64.75], [47.25, 64.65], [47.5, 64.75], [48.03, 64.53], [48.25, 64.0], [48.03, 63.47], [47.68, 63.32], [47.53, 62.97], [47.0, 62.75], [46.47, 62.97], [46.32, 63.32], [46.25, 63.35], [46.0, 63.25], [45.75, 63.35], [45.5, 63.25], [45.25, 63.35], [45.0, 63.25], [44.47, 63.47], [44.32, 63.82], [44.25, 63.85], [44.0, 63.75], [43.75, 63.85], [43.5, 63.75], [43.25, 63.85], [43.0, 63.75], [42.75, 63.85], [42.5, 63.75]]]]}, "2021-12-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[34.97, 58.97], [34.75, 59.5], [34.97, 60.03], [35.5, 60.25], [35.75, 60.15], [35.82, 60.18], [35.97, 60.53], [36.5, 60.75], [36.75, 60.65], [36.82, 60.68], [36.97, 61.03], [37.5, 61.25], [37.75, 61.15], [38.0, 61.25], [38.25, 61.15], [38.5, 61.25], [38.75, 61.15], [38.82, 61.18], [38.85, 61.25], [38.75, 61.5], [38.97, 62.03], [39.5, 62.25], [39.75, 62.15], [40.0, 62.25], [40.25, 62.15], [40.32, 62.18], [40.47, 62.53], [41.0, 62.75], [41.43, 62.57], [41.25, 63.0], [41.35, 63.25], [41.25, 63.5], [41.47, 64.03], [41.82, 64.18], [41.85, 64.25], [41.75, 64.5], [41.97, 65.03], [42.5, 65.25], [42.75, 65.15], [43.0, 65.25], [43.25, 65.15], [43.5, 65.25], [43.75, 65.15], [44.0, 65.25], [44.25, 65.15], [44.5, 65.25], [44.75, 65.15], [45.0, 65.25], [45.25, 65.15], [45.5, 65.25], [45.75, 65.15], [46.0, 65.25], [46.53, 65.03], [46.68, 64.68], [46.75, 64.65], [47.0, 64.75], [47.25, 64.65], [47.5, 64.75], [48.03, 64.53], [48.25, 64.0], [48.03, 63.47], [47.68, 63.32], [47.53, 62.97], [47.18, 62.82], [47.03, 62.47], [46.5, 62.25], [46.25, 62.35], [46.18, 62.32], [46.03, 61.97], [45.5, 61.75], [45.25, 61.85], [45.18, 61.82], [45.15, 61.75], [45.25, 61.5], [45.03, 60.97], [44.68, 60.82], [44.53, 60.47], [44.18, 60.32], [44.03, 59.97], [43.5, 59.75], [43.25, 59.85], [43.18, 59.82], [43.03, 59.47], [42.5, 59.25], [42.25, 59.35], [42.18, 59.32], [42.03, 58.97], [41.5, 58.75], [41.25, 58.85], [41.0, 58.75], [40.75, 58.85], [40.5, 58.75], [40.25, 58.85], [40.0, 58.75], [39.75, 58.85], [39.5, 58.75], [39.25, 58.85], [39.18, 58.82], [39.15, 58.75], [39.25, 58.5], [39.03, 57.97], [38.5, 57.75], [38.25, 57.85], [38.0, 57.75], [37.75, 57.85], [37.5, 57.75], [37.25, 57.85], [37.0, 57.75], [36.47, 57.97], [36.32, 58.32], [36.25, 58.35], [36.0, 58.25], [35.47, 58.47], [35.32, 58.82], [34.97, 58.97]]]]}, "2021-12-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[34.97, 58.97], [34.75, 59.5], [34.97, 60.03], [35.5, 60.25], [35.75, 60.15], [35.82, 60.18], [35.97, 60.53], [36.5, 60.75], [36.75, 60.65], [36.82, 60.68], [36.97, 61.03], [37.5, 61.25], [37.75, 61.15], [38.0, 61.25], [38.25, 61.15], [38.5, 61.25], [38.75, 61.15], [38.82, 61.18], [38.85, 61.25], [38.75, 61.5], [38.97, 62.03], [39.5, 62.25], [39.75, 62.15], [40.0, 62.25], [40.25, 62.15], [40.32, 62.18], [40.47, 62.53], [41.0, 62.75], [41.43, 62.57], [41.25, 63.0], [41.35, 63.25], [41.25, 63.5], [41.47, 64.03], [41.82, 64.18], [41.85, 64.25], [41.75, 64.5], [41.97, 65.03], [42.5, 65.25], [42.75, 65.15], [43.0, 65.25], [43.25, 65.15], [43.5, 65.25], [43.75, 65.15], [44.0, 65.25], [44.25, 65.15], [44.5, 65.25], [44.75, 65.15], [45.0, 65.25], [45.25, 65.15], [45.5, 65.25], [45.75, 65.15], [46.0, 65.25], [46.53, 65.03], [46.68, 64.68], [46.75, 64.65], [47.0, 64.75], [47.25, 64.65], [47.5, 64.75], [48.03, 64.53], [48.25, 64.0], [48.15, 63.75], [48.25, 63.5], [48.04, 63.0], [48.25, 62.5], [48.03, 61.97], [47.5, 61.75], [47.25, 61.85], [47.0, 61.75], [46.75, 61.85], [46.5, 61.75], [46.0, 61.96], [45.5, 61.75], [45.25, 61.85], [45.18, 61.82], [45.15, 61.75], [45.25, 61.5], [45.03, 60.97], [44.68, 60.82], [44.53, 60.47], [44.18, 60.32], [44.03, 59.97], [43.5, 59.75], [43.25, 59.85], [43.18, 59.82], [43.03, 59.47], [42.5, 59.25], [42.25, 59.35], [42.18, 59.32], [42.03, 58.97], [41.5, 58.75], [41.25, 58.85], [41.0, 58.75], [40.75, 58.85], [40.5, 58.75], [40.25, 58.85], [40.0, 58.75], [39.75, 58.85], [39.5, 58.75], [39.25, 58.85], [39.18, 58.82], [39.15, 58.75], [39.25, 58.5], [39.03, 57.97], [38.5, 57.75], [38.25, 57.85], [38.0, 57.75], [37.75, 57.85], [37.5, 57.75], [37.25, 57.85], [37.0, 57.75], [36.47, 57.97], [36.32, 58.32], [36.25, 58.35], [36.0, 58.25], [35.47, 58.47], [35.32, 58.82], [34.97, 58.97]]]]}, "2021-12-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[34.97, 58.97], [34.75, 59.5], [34.97, 60.03], [35.5, 60.25], [35.75, 60.15], [35.82, 60.18], [35.97, 60.53], [36.5, 60.75], [36.75, 60.65], [36.82, 60.68], [36.97, 61.03], [37.5, 61.25], [37.75, 61.15], [38.0, 61.25], [38.25, 61.15], [38.5, 61.25], [38.75, 61.15], [38.82, 61.18], [38.85, 61.25], [38.75, 61.5], [38.97, 62.03], [39.5, 62.25], [39.75, 62.15], [40.0, 62.25], [40.25, 62.15], [40.32, 62.18], [40.47, 62.53], [41.0, 62.75], [41.43, 62.57], [41.25, 63.0], [41.35, 63.25], [41.25, 63.5], [41.47, 64.03], [41.82, 64.18], [41.97, 64.53], [42.5, 64.75], [42.75, 64.65], [43.0, 64.75], [43.25, 64.65], [43.32, 64.68], [43.47, 65.03], [44.0, 65.25], [44.25, 65.15], [44.5, 65.25], [44.75, 65.15], [45.0, 65.25], [45.25, 65.15], [45.5, 65.25], [45.75, 65.15], [46.0, 65.25], [46.53, 65.03], [46.68, 64.68], [46.75, 64.65], [47.0, 64.75], [47.25, 64.65], [47.5, 64.75], [48.03, 64.53], [48.25, 64.0], [48.15, 63.75], [48.25, 63.5], [48.04, 63.0], [48.25, 62.5], [48.03, 61.97], [47.5, 61.75], [47.25, 61.85], [47.0, 61.75], [46.75, 61.85], [46.5, 61.75], [46.0, 61.96], [45.5, 61.75], [45.25, 61.85], [45.18, 61.82], [45.15, 61.75], [45.25, 61.5], [45.03, 60.97], [44.68, 60.82], [44.53, 60.47], [44.18, 60.32], [44.03, 59.97], [43.5, 59.75], [43.25, 59.85], [43.18, 59.82], [43.03, 59.47], [42.5, 59.25], [42.25, 59.35], [42.18, 59.32], [42.03, 58.97], [41.5, 58.75], [41.25, 58.85], [41.0, 58.75], [40.75, 58.85], [40.5, 58.75], [40.25, 58.85], [40.0, 58.75], [39.75, 58.85], [39.5, 58.75], [39.25, 58.85], [39.18, 58.82], [39.15, 58.75], [39.25, 58.5], [39.03, 57.97], [38.5, 57.75], [38.25, 57.85], [38.0, 57.75], [37.75, 57.85], [37.5, 57.75], [37.25, 57.85], [37.0, 57.75], [36.47, 57.97], [36.32, 58.32], [36.25, 58.35], [36.0, 58.25], [35.47, 58.47], [35.32, 58.82], [34.97, 58.97]]]]}, "2021-12-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[46.35, 63.25], [46.25, 63.5], [46.47, 64.03], [46.82, 64.18], [46.97, 64.53], [47.5, 64.75], [48.03, 64.53], [48.25, 64.0], [48.15, 63.75], [48.25, 63.5], [48.04, 63.0], [48.25, 62.5], [48.03, 61.97], [47.5, 61.75], [47.25, 61.85], [47.0, 61.75], [46.75, 61.85], [46.5, 61.75], [45.97, 61.97], [45.75, 62.5], [45.97, 63.03], [46.32, 63.18], [46.35, 63.25]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -20.716849056151688}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -15.555861885374915}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-24.67034059928119, -23.604811623499188, -26.97489873255543, -25.388623718559643, -26.56185361076666]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-26.044736805299408, -30.905100752327513, -29.624136317981424, -29.157809663653325, -26.97003522966665]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-14.180418503468198, -14.389241945472225, -17.190114985964076, -15.301993488475123, -13.621760643933433]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-15.334255441368839, -20.716849056151688, -20.312858809350246, -17.128515793076247, -13.999421246728986]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.7302168980922368, -1.823746264167825, -2.1524535235014146, -1.9031515209820442, -1.5055374697364103]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.8451756958034373, -2.4661835999212998, -2.6499427903890322, -2.6335393103791773, -1.5517464453906773]}}