{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:08:54.398981", "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-Nov-30_to_2025-Dec-03_119.5_49.0"}, "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": 2025110000875}, "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": "November 30 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 03 2025"}, "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": 61582.79651014711}, "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": ["China", "Mongolia"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Asia", "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": 49.0}, "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": 119.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "119.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 117.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 121.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 47.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 49.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[117.25, 49.5], [117.47, 50.03], [118.0, 50.25], [118.25, 50.15], [118.5, 50.25], [118.75, 50.15], [119.0, 50.25], [119.25, 50.15], [119.5, 50.25], [120.03, 50.03], [120.18, 49.68], [120.25, 49.65], [120.5, 49.75], [121.03, 49.53], [121.18, 49.18], [121.53, 49.03], [121.75, 48.5], [121.53, 47.97], [121.18, 47.82], [121.15, 47.75], [121.25, 47.5], [121.03, 46.97], [120.68, 46.82], [120.53, 46.47], [120.0, 46.25], [119.75, 46.35], [119.5, 46.25], [118.97, 46.47], [118.82, 46.82], [118.47, 46.97], [118.32, 47.32], [118.25, 47.35], [118.0, 47.25], [117.75, 47.35], [117.5, 47.25], [116.97, 47.47], [116.75, 48.0], [116.97, 48.53], [117.32, 48.68], [117.35, 48.75], [117.25, 49.0], [117.35, 49.25], [117.25, 49.5]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Siberia"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-11-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[118.97, 49.53], [119.5, 49.75], [120.03, 49.53], [120.25, 49.0], [120.03, 48.47], [119.5, 48.25], [118.97, 48.47], [118.75, 49.0], [118.97, 49.53]]]]}, "2025-12-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[117.35, 48.75], [117.25, 49.0], [117.35, 49.25], [117.25, 49.5], [117.47, 50.03], [118.0, 50.25], [118.25, 50.15], [118.5, 50.25], [118.75, 50.15], [119.0, 50.25], [119.25, 50.15], [119.5, 50.25], [120.03, 50.03], [120.18, 49.68], [120.25, 49.65], [120.5, 49.75], [121.03, 49.53], [121.18, 49.18], [121.53, 49.03], [121.75, 48.5], [121.53, 47.97], [121.18, 47.82], [121.15, 47.75], [121.25, 47.5], [121.03, 46.97], [120.68, 46.82], [120.53, 46.47], [120.0, 46.25], [119.75, 46.35], [119.5, 46.25], [118.97, 46.47], [118.82, 46.82], [118.47, 46.97], [118.32, 47.32], [118.25, 47.35], [118.0, 47.25], [117.75, 47.35], [117.5, 47.25], [116.97, 47.47], [116.75, 48.0], [116.97, 48.53], [117.32, 48.68], [117.35, 48.75]]]]}, "2025-12-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[117.35, 48.75], [117.25, 49.0], [117.35, 49.25], [117.25, 49.5], [117.47, 50.03], [118.0, 50.25], [118.25, 50.15], [118.5, 50.25], [118.75, 50.15], [119.0, 50.25], [119.25, 50.15], [119.5, 50.25], [120.03, 50.03], [120.18, 49.68], [120.25, 49.65], [120.5, 49.75], [121.03, 49.53], [121.18, 49.18], [121.53, 49.03], [121.75, 48.5], [121.53, 47.97], [121.18, 47.82], [121.15, 47.75], [121.25, 47.5], [121.03, 46.97], [120.68, 46.82], [120.53, 46.47], [120.0, 46.25], [119.75, 46.35], [119.5, 46.25], [118.97, 46.47], [118.82, 46.82], [118.47, 46.97], [118.32, 47.32], [118.25, 47.35], [118.0, 47.25], [117.75, 47.35], [117.5, 47.25], [116.97, 47.47], [116.75, 48.0], [116.97, 48.53], [117.32, 48.68], [117.35, 48.75]]]]}, "2025-12-03T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[117.35, 48.75], [117.25, 49.0], [117.35, 49.25], [117.25, 49.5], [117.47, 50.03], [118.0, 50.25], [118.25, 50.15], [118.5, 50.25], [118.75, 50.15], [119.0, 50.25], [119.25, 50.15], [119.5, 50.25], [120.03, 50.03], [120.18, 49.68], [120.25, 49.65], [120.5, 49.75], [121.03, 49.53], [121.18, 49.18], [121.53, 49.03], [121.75, 48.5], [121.53, 47.97], [121.18, 47.82], [121.15, 47.75], [121.25, 47.5], [121.03, 46.97], [120.68, 46.82], [120.53, 46.47], [120.0, 46.25], [119.75, 46.35], [119.5, 46.25], [118.97, 46.47], [118.82, 46.82], [118.47, 46.97], [118.32, 47.32], [118.25, 47.35], [118.0, 47.25], [117.75, 47.35], [117.5, 47.25], [116.97, 47.47], [116.75, 48.0], [116.97, 48.53], [117.32, 48.68], [117.35, 48.75]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -12.513441735327092}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -9.324153171323125}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-23.82632993062336, -25.46486960517032, -29.057787450154592, -26.339916865030858]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-23.82632993062336, -26.658991241455055, -30.588557306925424, -28.653369013468392]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-6.724007088251625, -8.44870467051636, -11.428545691211303, -8.181880688344092]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.724007088251625, -9.295409651213873, -12.513441735327092, -9.429546130213055]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3012165520315122, -1.608227728038646, -2.184147794226809, -1.5750054022919653]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.3012165520315122, -1.908161443310853, -2.363744425524858, -1.7807336079252207]}}