{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:57:58.838527", "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": "2025-Dec-21_to_2025-Dec-26_140.0_67.0"}, "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": 2025120000658}, "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 21 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 26 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 6}, "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": 279950.6945565048}, "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"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Russian-Arctic", "Russian-Far-East"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Asia"]}, "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": 67.0}, "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": 140.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "140.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 137.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 150.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 59.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 67.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-12-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[138.97, 59.47], [138.75, 60.0], [138.97, 60.53], [139.5, 60.75], [140.03, 60.53], [140.25, 60.0], [140.03, 59.47], [139.5, 59.25], [138.97, 59.47]]], [[[141.53, 60.53], [141.75, 60.0], [141.53, 59.47], [141.0, 59.25], [140.47, 59.47], [140.25, 60.0], [140.47, 60.53], [141.0, 60.75], [141.53, 60.53]]]]}, "2025-12-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[138.35, 63.75], [138.25, 64.0], [138.35, 64.25], [138.3, 64.38], [138.0, 64.25], [137.47, 64.47], [137.25, 65.0], [137.47, 65.53], [138.0, 65.75], [138.3, 65.63], [138.47, 66.03], [139.0, 66.25], [139.3, 66.13], [139.38, 66.3], [138.97, 66.47], [138.75, 67.0], [138.97, 67.53], [139.5, 67.75], [139.75, 67.65], [140.0, 67.75], [140.53, 67.53], [140.75, 67.0], [140.63, 66.7], [140.75, 66.65], [141.0, 66.75], [141.53, 66.53], [141.75, 66.0], [141.65, 65.75], [141.75, 65.5], [141.53, 64.97], [141.13, 64.8], [141.18, 64.68], [141.53, 64.53], [141.68, 64.18], [142.03, 64.03], [142.18, 63.68], [142.53, 63.53], [142.68, 63.18], [143.03, 63.03], [143.2, 62.63], [143.5, 62.75], [143.75, 62.65], [144.0, 62.75], [144.25, 62.65], [144.5, 62.75], [145.03, 62.53], [145.18, 62.18], [145.53, 62.03], [145.75, 61.5], [145.53, 60.97], [145.18, 60.82], [145.15, 60.75], [145.25, 60.5], [145.15, 60.25], [145.25, 60.0], [145.15, 59.75], [145.25, 59.5], [145.03, 58.97], [144.5, 58.75], [144.25, 58.85], [144.0, 58.75], [143.75, 58.85], [143.5, 58.75], [143.25, 58.85], [143.0, 58.75], [142.75, 58.85], [142.5, 58.75], [141.97, 58.97], [141.82, 59.32], [141.5, 59.46], [141.0, 59.25], [140.75, 59.35], [140.5, 59.25], [140.25, 59.35], [140.0, 59.25], [139.75, 59.35], [139.5, 59.25], [138.97, 59.47], [138.75, 60.0], [138.85, 60.25], [138.82, 60.32], [138.47, 60.47], [138.25, 61.0], [138.38, 61.3], [137.97, 61.47], [137.75, 62.0], [137.96, 62.5], [137.75, 63.0], [137.97, 63.53], [138.32, 63.68], [138.35, 63.75]], [[139.75, 65.15], [140.0, 65.25], [139.7, 65.38], [139.63, 65.2], [139.75, 65.15]], [[140.25, 65.15], [140.38, 65.2], [140.32, 65.32], [140.25, 65.35], [140.0, 65.25], [140.25, 65.15]], [[143.5, 61.25], [143.2, 61.38], [143.03, 60.97], [142.68, 60.82], [142.63, 60.7], [142.75, 60.65], [143.0, 60.75], [143.25, 60.65], [143.32, 60.68], [143.47, 61.03], [143.82, 61.18], [143.85, 61.25], [143.82, 61.32], [143.75, 61.35], [143.5, 61.25]]], [[[143.25, 64.0], [143.46, 64.5], [143.25, 65.0], [143.47, 65.53], [144.0, 65.75], [144.25, 65.65], [144.5, 65.75], [145.03, 65.53], [145.25, 65.0], [145.13, 64.7], [145.53, 64.53], [145.68, 64.18], [146.03, 64.03], [146.25, 63.5], [146.03, 62.97], [145.5, 62.75], [145.25, 62.85], [145.0, 62.75], [144.75, 62.85], [144.5, 62.75], [144.25, 62.85], [144.0, 62.75], [143.47, 62.97], [143.25, 63.5], [143.35, 63.75], [143.25, 64.0]]], [[[145.75, 65.0], [145.97, 65.53], [146.5, 65.75], [147.03, 65.53], [147.25, 65.0], [147.03, 64.47], [146.5, 64.25], [145.97, 64.47], [145.75, 65.0]]], [[[144.47, 67.03], [145.0, 67.25], [145.25, 67.15], [145.5, 67.25], [146.03, 67.03], [146.25, 66.5], [146.03, 65.97], [145.5, 65.75], [145.25, 65.85], [145.0, 65.75], [144.47, 65.97], [144.25, 66.5], [144.47, 67.03]]]]}, "2025-12-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[137.47, 66.53], [137.82, 66.68], [137.97, 67.03], [138.5, 67.25], [138.75, 67.15], [138.82, 67.18], [138.97, 67.53], [139.5, 67.75], [139.75, 67.65], [140.0, 67.75], [140.25, 67.65], [140.5, 67.75], [141.03, 67.53], [141.18, 67.18], [141.53, 67.03], [141.68, 66.68], [142.03, 66.53], [142.18, 66.18], [142.25, 66.15], [142.32, 66.18], [142.47, 66.53], [142.88, 66.7], [142.75, 67.0], [142.97, 67.53], [143.5, 67.75], [144.03, 67.53], [144.18, 67.18], [144.3, 67.13], [144.47, 67.53], [145.0, 67.75], [145.25, 67.65], [145.5, 67.75], [145.75, 67.65], [146.0, 67.75], [146.25, 67.65], [146.5, 67.75], [147.0, 67.54], [147.5, 67.75], [147.75, 67.65], [148.0, 67.75], [148.53, 67.53], [148.75, 67.0], [148.63, 66.7], [148.75, 66.65], [149.0, 66.75], [149.53, 66.53], [149.68, 66.18], [149.75, 66.15], [150.0, 66.25], [150.25, 66.15], [150.5, 66.25], [151.03, 66.03], [151.25, 65.5], [151.03, 64.97], [150.68, 64.82], [150.53, 64.47], [150.18, 64.32], [150.15, 64.25], [150.25, 64.0], [150.15, 63.75], [150.25, 63.5], [150.03, 62.97], [149.5, 62.75], [148.97, 62.97], [148.82, 63.32], [148.75, 63.35], [148.5, 63.25], [148.25, 63.35], [148.0, 63.25], [147.47, 63.47], [147.32, 63.82], [147.25, 63.85], [147.13, 63.8], [147.25, 63.5], [147.03, 62.97], [146.5, 62.75], [146.25, 62.85], [146.0, 62.75], [145.75, 62.85], [145.5, 62.75], [145.25, 62.85], [145.0, 62.75], [144.75, 62.85], [144.5, 62.75], [145.03, 62.53], [145.18, 62.18], [145.53, 62.03], [145.75, 61.5], [145.53, 60.97], [145.18, 60.82], [145.15, 60.75], [145.25, 60.5], [145.15, 60.25], [145.25, 60.0], [145.15, 59.75], [145.25, 59.5], [145.03, 58.97], [144.5, 58.75], [144.25, 58.85], [144.0, 58.75], [143.75, 58.85], [143.5, 58.75], [143.25, 58.85], [143.0, 58.75], [142.75, 58.85], [142.5, 58.75], [141.97, 58.97], [141.82, 59.32], [141.5, 59.46], [141.0, 59.25], [140.75, 59.35], [140.5, 59.25], [140.25, 59.35], [140.0, 59.25], [139.75, 59.35], [139.5, 59.25], [138.97, 59.47], [138.75, 60.0], [138.85, 60.25], [138.82, 60.32], [138.47, 60.47], [138.25, 61.0], [138.38, 61.3], [137.97, 61.47], [137.75, 62.0], [137.96, 62.5], [137.75, 63.0], [137.97, 63.53], [138.32, 63.68], [138.35, 63.75], [138.32, 63.82], [137.97, 63.97], [137.82, 64.32], [137.75, 64.35], [137.5, 64.25], [136.97, 64.47], [136.75, 65.0], [136.97, 65.53], [137.38, 65.7], [137.25, 66.0], [137.47, 66.53]], [[144.25, 62.85], [144.0, 62.75], [144.25, 62.65], [144.5, 62.75], [144.25, 62.85]], [[143.75, 62.85], [143.5, 62.75], [143.75, 62.65], [144.0, 62.75], [143.75, 62.85]], [[143.25, 62.85], [143.18, 62.82], [143.15, 62.75], [143.2, 62.63], [143.5, 62.75], [143.25, 62.85]], [[142.68, 60.82], [142.63, 60.7], [142.75, 60.65], [143.0, 60.75], [143.25, 60.65], [143.32, 60.68], [143.47, 61.03], [143.82, 61.18], [143.85, 61.25], [143.82, 61.32], [143.75, 61.35], [143.5, 61.25], [143.2, 61.38], [143.03, 60.97], [142.68, 60.82]]]]}, "2025-12-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[137.47, 66.53], [137.82, 66.68], [137.97, 67.03], [138.5, 67.25], [138.75, 67.15], [138.82, 67.18], [138.97, 67.53], [139.5, 67.75], [139.75, 67.65], [140.0, 67.75], [140.25, 67.65], [140.5, 67.75], [141.03, 67.53], [141.18, 67.18], [141.53, 67.03], [141.68, 66.68], [142.03, 66.53], [142.18, 66.18], [142.25, 66.15], [142.32, 66.18], [142.47, 66.53], [142.88, 66.7], [142.75, 67.0], [142.97, 67.53], [143.5, 67.75], [144.03, 67.53], [144.18, 67.18], [144.3, 67.13], [144.47, 67.53], [145.0, 67.75], [145.25, 67.65], [145.5, 67.75], [145.75, 67.65], [146.0, 67.75], [146.25, 67.65], [146.5, 67.75], [147.0, 67.54], [147.5, 67.75], [147.75, 67.65], [148.0, 67.75], [148.53, 67.53], [148.75, 67.0], [148.63, 66.7], [148.75, 66.65], [149.0, 66.75], [149.53, 66.53], [149.68, 66.18], [149.75, 66.15], [150.0, 66.25], [150.25, 66.15], [150.5, 66.25], [151.03, 66.03], [151.25, 65.5], [151.03, 64.97], [150.68, 64.82], [150.53, 64.47], [150.18, 64.32], [150.15, 64.25], [150.25, 64.0], [150.15, 63.75], [150.25, 63.5], [150.03, 62.97], [149.5, 62.75], [148.97, 62.97], [148.82, 63.32], [148.75, 63.35], [148.5, 63.25], [148.25, 63.35], [148.0, 63.25], [147.47, 63.47], [147.32, 63.82], [147.25, 63.85], [147.13, 63.8], [147.25, 63.5], [147.03, 62.97], [146.5, 62.75], [146.25, 62.85], [146.0, 62.75], [145.75, 62.85], [145.5, 62.75], [145.25, 62.85], [145.0, 62.75], [144.75, 62.85], [144.5, 62.75], [145.03, 62.53], [145.18, 62.18], [145.53, 62.03], [145.75, 61.5], [145.53, 60.97], [145.18, 60.82], [145.15, 60.75], [145.25, 60.5], [145.15, 60.25], [145.25, 60.0], [145.15, 59.75], [145.25, 59.5], [145.03, 58.97], [144.5, 58.75], [144.25, 58.85], [144.0, 58.75], [143.75, 58.85], [143.5, 58.75], [143.25, 58.85], [143.0, 58.75], [142.75, 58.85], [142.5, 58.75], [141.97, 58.97], [141.82, 59.32], [141.47, 59.47], [141.32, 59.82], [141.25, 59.85], [141.18, 59.82], [141.03, 59.47], [140.5, 59.25], [140.25, 59.35], [140.0, 59.25], [139.75, 59.35], [139.5, 59.25], [138.97, 59.47], [138.75, 60.0], [138.85, 60.25], [138.82, 60.32], [138.47, 60.47], [138.25, 61.0], [138.38, 61.3], [137.97, 61.47], [137.75, 62.0], [137.96, 62.5], [137.75, 63.0], [137.97, 63.53], [138.32, 63.68], [138.35, 63.75], [138.32, 63.82], [137.97, 63.97], [137.82, 64.32], [137.75, 64.35], [137.5, 64.25], [136.97, 64.47], [136.75, 65.0], [136.97, 65.53], [137.38, 65.7], [137.25, 66.0], [137.47, 66.53]], [[144.25, 62.85], [144.0, 62.75], [144.25, 62.65], [144.5, 62.75], [144.25, 62.85]], [[143.75, 62.85], [143.5, 62.75], [143.75, 62.65], [144.0, 62.75], [143.75, 62.85]], [[143.25, 62.85], [143.18, 62.82], [143.15, 62.75], [143.2, 62.63], [143.5, 62.75], [143.25, 62.85]], [[142.68, 60.82], [142.63, 60.7], [142.75, 60.65], [143.0, 60.75], [143.25, 60.65], [143.32, 60.68], [143.47, 61.03], [143.82, 61.18], [143.85, 61.25], [143.82, 61.32], [143.75, 61.35], [143.5, 61.25], [143.2, 61.38], [143.03, 60.97], [142.68, 60.82]]]]}, "2025-12-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[137.47, 66.53], [137.82, 66.68], [137.97, 67.03], [138.5, 67.25], [138.75, 67.15], [138.82, 67.18], [138.97, 67.53], [139.5, 67.75], [139.75, 67.65], [140.0, 67.75], [140.25, 67.65], [140.5, 67.75], [141.03, 67.53], [141.18, 67.18], [141.53, 67.03], [141.68, 66.68], [142.03, 66.53], [142.18, 66.18], [142.25, 66.15], [142.32, 66.18], [142.47, 66.53], [142.88, 66.7], [142.75, 67.0], [142.97, 67.53], [143.5, 67.75], [144.03, 67.53], [144.18, 67.18], [144.3, 67.13], [144.47, 67.53], [145.0, 67.75], [145.25, 67.65], [145.5, 67.75], [145.75, 67.65], [146.0, 67.75], [146.25, 67.65], [146.5, 67.75], [147.0, 67.54], [147.5, 67.75], [147.75, 67.65], [148.0, 67.75], [148.53, 67.53], [148.75, 67.0], [148.63, 66.7], [148.75, 66.65], [149.0, 66.75], [149.53, 66.53], [149.68, 66.18], [149.75, 66.15], [150.0, 66.25], [150.25, 66.15], [150.5, 66.25], [151.03, 66.03], [151.25, 65.5], [151.03, 64.97], [150.68, 64.82], [150.53, 64.47], [150.18, 64.32], [150.15, 64.25], [150.25, 64.0], [150.15, 63.75], [150.25, 63.5], [150.03, 62.97], [149.5, 62.75], [148.97, 62.97], [148.82, 63.32], [148.75, 63.35], [148.5, 63.25], [148.25, 63.35], [148.0, 63.25], [147.47, 63.47], [147.32, 63.82], [147.25, 63.85], [147.13, 63.8], [147.25, 63.5], [147.03, 62.97], [146.5, 62.75], [146.25, 62.85], [146.0, 62.75], [145.47, 62.97], [145.32, 63.32], [145.25, 63.35], [145.0, 63.25], [144.75, 63.35], [144.5, 63.25], [144.25, 63.35], [144.18, 63.32], [144.03, 62.97], [143.5, 62.75], [143.25, 62.85], [143.18, 62.82], [143.03, 62.47], [142.5, 62.25], [142.25, 62.35], [142.0, 62.25], [141.75, 62.35], [141.5, 62.25], [141.25, 62.35], [141.0, 62.25], [140.47, 62.47], [140.25, 63.0], [140.35, 63.25], [140.32, 63.32], [140.25, 63.35], [140.0, 63.25], [139.75, 63.35], [139.68, 63.32], [139.53, 62.97], [139.0, 62.75], [138.47, 62.97], [138.25, 63.5], [138.35, 63.75], [138.32, 63.82], [137.97, 63.97], [137.82, 64.32], [137.75, 64.35], [137.5, 64.25], [136.97, 64.47], [136.75, 65.0], [136.97, 65.53], [137.38, 65.7], [137.25, 66.0], [137.47, 66.53]]]]}, "2025-12-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[146.97, 65.97], [146.75, 66.5], [146.97, 67.03], [147.5, 67.25], [148.03, 67.03], [148.25, 66.5], [148.03, 65.97], [147.5, 65.75], [146.97, 65.97]]], [[[145.47, 66.47], [145.25, 67.0], [145.47, 67.53], [146.0, 67.75], [146.53, 67.53], [146.75, 67.0], [146.53, 66.47], [146.0, 66.25], [145.47, 66.47]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -18.371798937806773}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -9.43990471046547}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-40.491527303059854, -41.119065399169926, -43.41116300169318, -44.293858656844435, -43.86500882915419, -40.459881846109994]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-44.81969299316404, -50.390133921305306, -52.197812143961556, -55.14744097391761, -54.71014887491859, -40.765301767984994]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-8.5648228000328, -8.404625943643719, -9.563256089898765, -10.4686074608292, -8.50705624577575, -7.365396566975079]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-9.11789058207978, -12.906869734700933, -14.270355944874211, -18.371798937806773, -13.237547133016278, -7.580793794694301]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.1902848183800563, -1.5311220779790722, -1.8014927763614037, -2.003632989971183, -1.6877441923274101, -1.485029560592231]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.197159703838965, -2.756649430028433, -2.7772676961550906, -3.4221832967475656, -2.8263378373775945, -1.520926743992994]}}