{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:09:13.049524", "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-07_to_2025-Dec-09_89.5_58.0"}, "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": 2025120000329}, "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 07 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 09 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": 51335.06507309148}, "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": 58.0}, "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": 89.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "89.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 84.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 92.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 58.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 60.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[84.75, 59.15], [85.0, 59.25], [85.25, 59.15], [85.5, 59.25], [85.75, 59.15], [86.0, 59.25], [86.25, 59.15], [86.5, 59.25], [86.75, 59.15], [87.0, 59.25], [87.25, 59.15], [87.32, 59.18], [87.47, 59.53], [88.0, 59.75], [88.25, 59.65], [88.5, 59.75], [88.75, 59.65], [88.82, 59.68], [88.97, 60.03], [89.5, 60.25], [89.75, 60.15], [89.82, 60.18], [89.97, 60.53], [90.5, 60.75], [90.75, 60.65], [91.0, 60.75], [91.53, 60.53], [91.75, 60.0], [91.63, 59.7], [91.75, 59.65], [92.0, 59.75], [92.53, 59.53], [92.75, 59.0], [92.53, 58.47], [92.0, 58.25], [91.75, 58.35], [91.68, 58.32], [91.53, 57.97], [91.0, 57.75], [90.75, 57.85], [90.5, 57.75], [90.25, 57.85], [90.18, 57.82], [90.03, 57.47], [89.5, 57.25], [88.97, 57.47], [88.82, 57.82], [88.75, 57.85], [88.5, 57.75], [88.25, 57.85], [88.0, 57.75], [87.75, 57.85], [87.5, 57.75], [87.25, 57.85], [87.0, 57.75], [86.75, 57.85], [86.68, 57.82], [86.53, 57.47], [86.0, 57.25], [85.5, 57.46], [85.0, 57.25], [84.75, 57.35], [84.5, 57.25], [84.25, 57.35], [84.0, 57.25], [83.47, 57.47], [83.25, 58.0], [83.47, 58.53], [83.82, 58.68], [83.97, 59.03], [84.5, 59.25], [84.75, 59.15]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.Siberia", "E.Siberia"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-12-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[83.97, 59.03], [84.5, 59.25], [84.75, 59.15], [85.0, 59.25], [85.25, 59.15], [85.5, 59.25], [85.75, 59.15], [86.0, 59.25], [86.25, 59.15], [86.5, 59.25], [86.75, 59.15], [87.0, 59.25], [87.25, 59.15], [87.32, 59.18], [87.47, 59.53], [88.0, 59.75], [88.25, 59.65], [88.5, 59.75], [88.75, 59.65], [88.82, 59.68], [88.97, 60.03], [89.5, 60.25], [89.75, 60.15], [89.82, 60.18], [89.97, 60.53], [90.5, 60.75], [90.75, 60.65], [91.0, 60.75], [91.53, 60.53], [91.75, 60.0], [91.63, 59.7], [91.75, 59.65], [92.0, 59.75], [92.53, 59.53], [92.75, 59.0], [92.53, 58.47], [92.0, 58.25], [91.75, 58.35], [91.68, 58.32], [91.53, 57.97], [91.0, 57.75], [90.75, 57.85], [90.5, 57.75], [90.25, 57.85], [90.18, 57.82], [90.03, 57.47], [89.5, 57.25], [88.97, 57.47], [88.82, 57.82], [88.75, 57.85], [88.5, 57.75], [88.25, 57.85], [88.0, 57.75], [87.75, 57.85], [87.5, 57.75], [87.25, 57.85], [87.0, 57.75], [86.75, 57.85], [86.68, 57.82], [86.53, 57.47], [86.0, 57.25], [85.5, 57.46], [85.0, 57.25], [84.75, 57.35], [84.5, 57.25], [84.25, 57.35], [84.0, 57.25], [83.47, 57.47], [83.25, 58.0], [83.47, 58.53], [83.82, 58.68], [83.97, 59.03]]]]}, "2025-12-08T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[83.97, 59.03], [84.5, 59.25], [84.75, 59.15], [85.0, 59.25], [85.25, 59.15], [85.5, 59.25], [85.75, 59.15], [86.0, 59.25], [86.25, 59.15], [86.5, 59.25], [86.75, 59.15], [87.0, 59.25], [87.25, 59.15], [87.32, 59.18], [87.47, 59.53], [88.0, 59.75], [88.25, 59.65], [88.5, 59.75], [88.75, 59.65], [88.82, 59.68], [88.97, 60.03], [89.5, 60.25], [89.75, 60.15], [89.82, 60.18], [89.97, 60.53], [90.5, 60.75], [90.75, 60.65], [91.0, 60.75], [91.53, 60.53], [91.75, 60.0], [91.63, 59.7], [91.75, 59.65], [92.0, 59.75], [92.53, 59.53], [92.75, 59.0], [92.53, 58.47], [92.0, 58.25], [91.75, 58.35], [91.68, 58.32], [91.53, 57.97], [91.0, 57.75], [90.75, 57.85], [90.5, 57.75], [90.25, 57.85], [90.18, 57.82], [90.03, 57.47], [89.5, 57.25], [88.97, 57.47], [88.82, 57.82], [88.75, 57.85], [88.5, 57.75], [88.25, 57.85], [88.0, 57.75], [87.75, 57.85], [87.5, 57.75], [87.25, 57.85], [87.0, 57.75], [86.75, 57.85], [86.68, 57.82], [86.53, 57.47], [86.0, 57.25], [85.5, 57.46], [85.0, 57.25], [84.75, 57.35], [84.5, 57.25], [84.25, 57.35], [84.0, 57.25], [83.47, 57.47], [83.25, 58.0], [83.47, 58.53], [83.82, 58.68], [83.97, 59.03]]]]}, "2025-12-09T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[83.97, 59.03], [84.5, 59.25], [84.75, 59.15], [85.0, 59.25], [85.25, 59.15], [85.5, 59.25], [85.75, 59.15], [86.0, 59.25], [86.25, 59.15], [86.5, 59.25], [86.75, 59.15], [87.0, 59.25], [87.25, 59.15], [87.32, 59.18], [87.47, 59.53], [88.0, 59.75], [88.25, 59.65], [88.5, 59.75], [88.75, 59.65], [88.82, 59.68], [88.97, 60.03], [89.5, 60.25], [89.75, 60.15], [89.82, 60.18], [89.97, 60.53], [90.5, 60.75], [90.75, 60.65], [91.0, 60.75], [91.53, 60.53], [91.75, 60.0], [91.63, 59.7], [91.75, 59.65], [92.0, 59.75], [92.53, 59.53], [92.75, 59.0], [92.53, 58.47], [92.0, 58.25], [91.75, 58.35], [91.68, 58.32], [91.53, 57.97], [91.0, 57.75], [90.75, 57.85], [90.5, 57.75], [90.25, 57.85], [90.18, 57.82], [90.03, 57.47], [89.5, 57.25], [88.97, 57.47], [88.82, 57.82], [88.75, 57.85], [88.5, 57.75], [88.25, 57.85], [88.0, 57.75], [87.75, 57.85], [87.5, 57.75], [87.25, 57.85], [87.0, 57.75], [86.75, 57.85], [86.68, 57.82], [86.53, 57.47], [86.0, 57.25], [85.5, 57.46], [85.0, 57.25], [84.75, 57.35], [84.5, 57.25], [84.25, 57.35], [84.0, 57.25], [83.47, 57.47], [83.25, 58.0], [83.47, 58.53], [83.82, 58.68], [83.97, 59.03]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -21.17456602212866}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -16.449544928230882}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-31.05043512980143, -37.27532615661619, -32.26885388692219]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-33.61904627482093, -39.518777592976875, -34.49354972839353]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-14.380127808103708, -20.179512759454653, -14.788994217134288]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-15.713402444224272, -21.17456602212866, -18.03679457768763]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4808916624520545, -2.094037129482928, -1.5510176065888144]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5948601213544646, -2.204107091440004, -1.9304901636230098]}}