{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:09:23.022435", "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-23_to_2025-Dec-25_57.0_61.0"}, "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": 2025120000778}, "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 23 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 25 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 3}, "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": 81412.51376850957}, "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": 61.0}, "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": 54.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 59.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 59.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 63.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[53.75, 60.0], [53.85, 60.25], [53.75, 60.5], [53.97, 61.03], [54.32, 61.18], [54.35, 61.25], [54.25, 61.5], [54.47, 62.03], [54.82, 62.18], [54.97, 62.53], [55.5, 62.75], [55.75, 62.65], [55.82, 62.68], [55.85, 62.75], [55.75, 63.0], [55.85, 63.25], [55.75, 63.5], [55.97, 64.03], [56.5, 64.25], [56.75, 64.15], [57.0, 64.25], [57.25, 64.15], [57.5, 64.25], [58.03, 64.03], [58.18, 63.68], [58.25, 63.65], [58.5, 63.75], [59.03, 63.53], [59.18, 63.18], [59.53, 63.03], [59.75, 62.5], [59.65, 62.25], [59.75, 62.0], [59.53, 61.47], [59.18, 61.32], [59.03, 60.97], [58.68, 60.82], [58.53, 60.47], [58.18, 60.32], [58.03, 59.97], [57.68, 59.82], [57.53, 59.47], [57.0, 59.25], [56.75, 59.35], [56.68, 59.32], [56.53, 58.97], [56.0, 58.75], [55.75, 58.85], [55.5, 58.75], [55.25, 58.85], [55.18, 58.82], [55.03, 58.47], [54.5, 58.25], [53.97, 58.47], [53.75, 59.0], [53.85, 59.25], [53.75, 59.5], [53.85, 59.75], [53.75, 60.0]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Europe"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-12-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[53.75, 59.5], [53.85, 59.75], [53.75, 60.0], [53.85, 60.25], [53.75, 60.5], [53.97, 61.03], [54.32, 61.18], [54.35, 61.25], [54.25, 61.5], [54.47, 62.03], [54.82, 62.18], [54.97, 62.53], [55.5, 62.75], [55.75, 62.65], [55.82, 62.68], [55.85, 62.75], [55.75, 63.0], [55.85, 63.25], [55.75, 63.5], [55.97, 64.03], [56.5, 64.25], [56.75, 64.15], [57.0, 64.25], [57.25, 64.15], [57.5, 64.25], [58.03, 64.03], [58.18, 63.68], [58.25, 63.65], [58.5, 63.75], [59.03, 63.53], [59.18, 63.18], [59.53, 63.03], [59.75, 62.5], [59.65, 62.25], [59.75, 62.0], [59.53, 61.47], [59.18, 61.32], [59.03, 60.97], [58.68, 60.82], [58.53, 60.47], [58.18, 60.32], [58.03, 59.97], [57.68, 59.82], [57.53, 59.47], [57.0, 59.25], [56.75, 59.35], [56.68, 59.32], [56.53, 58.97], [56.0, 58.75], [55.75, 58.85], [55.5, 58.75], [55.25, 58.85], [55.18, 58.82], [55.03, 58.47], [54.5, 58.25], [53.97, 58.47], [53.75, 59.0], [53.85, 59.25], [53.75, 59.5]]]]}, "2025-12-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[53.75, 59.5], [53.85, 59.75], [53.75, 60.0], [53.85, 60.25], [53.75, 60.5], [53.97, 61.03], [54.32, 61.18], [54.35, 61.25], [54.25, 61.5], [54.47, 62.03], [54.82, 62.18], [54.97, 62.53], [55.5, 62.75], [55.75, 62.65], [55.82, 62.68], [55.85, 62.75], [55.75, 63.0], [55.85, 63.25], [55.75, 63.5], [55.97, 64.03], [56.5, 64.25], [56.75, 64.15], [57.0, 64.25], [57.25, 64.15], [57.5, 64.25], [58.03, 64.03], [58.18, 63.68], [58.25, 63.65], [58.5, 63.75], [59.03, 63.53], [59.18, 63.18], [59.53, 63.03], [59.75, 62.5], [59.65, 62.25], [59.75, 62.0], [59.53, 61.47], [59.18, 61.32], [59.03, 60.97], [58.68, 60.82], [58.53, 60.47], [58.18, 60.32], [58.03, 59.97], [57.68, 59.82], [57.53, 59.47], [57.0, 59.25], [56.75, 59.35], [56.68, 59.32], [56.53, 58.97], [56.0, 58.75], [55.75, 58.85], [55.5, 58.75], [55.25, 58.85], [55.18, 58.82], [55.03, 58.47], [54.5, 58.25], [53.97, 58.47], [53.75, 59.0], [53.85, 59.25], [53.75, 59.5]]]]}, "2025-12-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[53.75, 59.5], [53.85, 59.75], [53.75, 60.0], [53.85, 60.25], [53.75, 60.5], [53.97, 61.03], [54.32, 61.18], [54.35, 61.25], [54.25, 61.5], [54.47, 62.03], [54.82, 62.18], [54.97, 62.53], [55.5, 62.75], [55.75, 62.65], [55.82, 62.68], [55.85, 62.75], [55.75, 63.0], [55.85, 63.25], [55.75, 63.5], [55.97, 64.03], [56.5, 64.25], [56.75, 64.15], [57.0, 64.25], [57.25, 64.15], [57.5, 64.25], [58.03, 64.03], [58.18, 63.68], [58.25, 63.65], [58.5, 63.75], [59.03, 63.53], [59.18, 63.18], [59.53, 63.03], [59.75, 62.5], [59.65, 62.25], [59.75, 62.0], [59.53, 61.47], [59.18, 61.32], [59.03, 60.97], [58.68, 60.82], [58.53, 60.47], [58.18, 60.32], [58.03, 59.97], [57.68, 59.82], [57.53, 59.47], [57.0, 59.25], [56.75, 59.35], [56.68, 59.32], [56.53, 58.97], [56.0, 58.75], [55.75, 58.85], [55.5, 58.75], [55.25, 58.85], [55.18, 58.82], [55.03, 58.47], [54.5, 58.25], [53.97, 58.47], [53.75, 59.0], [53.85, 59.25], [53.75, 59.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -23.800271513644788}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -17.18501586346583}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-30.780146650834496, -36.55256792704262, -29.944156993519158]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-36.7970146179199, -42.10544878641761, -33.39423090616859]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-15.503426833719285, -21.295591818751063, -14.756028937927171]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-18.41608247311578, -23.800271513644788, -18.962423154367798]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.7886541349227556, -2.474228701793614, -1.736851217581376]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.9342515997248748, -2.7517896076226864, -2.326336220761303]}}