{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:14:58.953126", "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-Oct-30_to_2021-Nov-02_57.0_66.0"}, "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": 2021100001031}, "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": "October 30 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "November 02 2021"}, "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": 67380.70944744995}, "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": ["Barents Sea"]}, "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": 66.0}, "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": 57.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "57.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 53.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 60.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 65.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 68.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[59.0, 64.75], [58.75, 64.85], [58.5, 64.75], [57.97, 64.97], [57.82, 65.32], [57.75, 65.35], [57.5, 65.25], [57.25, 65.35], 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"value": ["E.Europe", "Russian-Arctic"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-10-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[53.46, 68.0], [53.25, 68.5], [53.47, 69.03], [54.0, 69.25], [54.25, 69.15], [54.5, 69.25], [54.75, 69.15], [55.0, 69.25], [55.25, 69.15], [55.5, 69.25], [55.75, 69.15], [56.0, 69.25], [56.53, 69.03], [56.68, 68.68], [56.75, 68.65], [57.0, 68.75], [57.25, 68.65], [57.5, 68.75], [57.75, 68.65], [58.0, 68.75], [58.53, 68.53], [58.68, 68.18], [58.75, 68.15], [59.0, 68.25], [59.25, 68.15], [59.5, 68.25], [60.03, 68.03], [60.18, 67.68], [60.53, 67.53], [60.75, 67.0], [60.53, 66.47], [60.13, 66.3], [60.25, 66.0], [60.03, 65.47], [59.68, 65.32], [59.53, 64.97], [59.0, 64.75], [58.75, 64.85], [58.5, 64.75], [57.97, 64.97], [57.82, 65.32], [57.75, 65.35], [57.5, 65.25], [57.25, 65.35], [57.0, 65.25], [56.75, 65.35], [56.5, 65.25], [56.25, 65.35], 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