{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:02:30.503720", "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": "2024-Dec-29_to_2025-Jan-02_139.5_51.5"}, "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": 2024120000706}, "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 29 2024"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 02 2025"}, "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": 75742.56763380436}, "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": ["Sea of Japan"]}, "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": 51.5}, "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": 139.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "139.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 137.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 141.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 49.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 54.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[137.35, 52.75], [137.32, 52.82], [136.97, 52.97], [136.75, 53.5], [136.97, 54.03], [137.5, 54.25], [137.75, 54.15], 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of all IPCC regions affected", "value": ["Russian-Far-East"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2024-12-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[137.47, 52.97], [137.25, 53.5], [137.47, 54.03], [138.0, 54.25], [138.25, 54.15], [138.5, 54.25], [138.75, 54.15], [139.0, 54.25], [139.5, 54.04], [140.0, 54.25], [140.53, 54.03], [140.75, 53.5], [140.54, 53.0], [140.75, 52.5], [140.65, 52.25], [140.68, 52.18], [141.03, 52.03], [141.25, 51.5], [141.15, 51.25], [141.25, 51.0], [141.15, 50.75], [141.25, 50.5], [141.15, 50.25], [141.25, 50.0], [141.03, 49.47], [140.68, 49.32], [140.65, 49.25], [140.75, 49.0], [140.53, 48.47], [140.0, 48.25], [139.47, 48.47], [139.25, 49.0], [139.35, 49.25], [139.25, 49.5], [139.35, 49.75], [139.25, 50.0], [139.35, 50.25], [139.25, 50.5], [139.35, 50.75], [139.32, 50.82], [138.97, 50.97], [138.82, 51.32], [138.47, 51.47], [138.32, 51.82], 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