{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:09:09.076676", "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-03_to_2025-Dec-08_89.5_70.0"}, "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": 2025120000219}, "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 03 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 08 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": 62622.095929934905}, "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": 70.0}, "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": 87.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 100.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 67.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 71.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[88.15, 67.75], [88.18, 67.68], [88.53, 67.53], [88.75, 67.0], [88.53, 66.47], [88.0, 66.25], [87.47, 66.47], [87.32, 66.82], [86.97, 66.97], [86.75, 67.5], [86.85, 67.75], [86.82, 67.82], [86.47, 67.97], [86.25, 68.5], [86.35, 68.75], [86.25, 69.0], [86.47, 69.53], [86.82, 69.68], [86.85, 69.75], [86.75, 70.0], [86.97, 70.53], [87.5, 70.75], [87.75, 70.65], [88.0, 70.75], [88.25, 70.65], [88.5, 70.75], [88.75, 70.65], [88.82, 70.68], [88.97, 71.03], [89.5, 71.25], [89.75, 71.15], [90.0, 71.25], [90.25, 71.15], [90.5, 71.25], [90.75, 71.15], [91.0, 71.25], [91.25, 71.15], [91.5, 71.25], [91.75, 71.15], [92.0, 71.25], [92.25, 71.15], [92.5, 71.25], [92.75, 71.15], [93.0, 71.25], [93.25, 71.15], [93.5, 71.25], [93.75, 71.15], [93.82, 71.18], [93.97, 71.53], [94.5, 71.75], [94.75, 71.65], [95.0, 71.75], [95.53, 71.53], [95.75, 71.0], [95.65, 70.75], [95.68, 70.68], [95.75, 70.65], [95.82, 70.68], [95.97, 71.03], [96.5, 71.25], [96.75, 71.15], [97.0, 71.25], [97.25, 71.15], [97.5, 71.25], [97.75, 71.15], [98.0, 71.25], [98.25, 71.15], [98.32, 71.18], [98.47, 71.53], [99.0, 71.75], [99.25, 71.65], [99.5, 71.75], [99.75, 71.65], [100.0, 71.75], [100.53, 71.53], [100.75, 71.0], [100.53, 70.47], [100.18, 70.32], [100.03, 69.97], [99.5, 69.75], [99.25, 69.85], [99.18, 69.82], [99.03, 69.47], [98.5, 69.25], [98.25, 69.35], [98.0, 69.25], [97.75, 69.35], [97.5, 69.25], [97.0, 69.46], [96.5, 69.25], [96.25, 69.35], [96.0, 69.25], [95.75, 69.35], [95.68, 69.32], [95.53, 68.97], [95.0, 68.75], [94.47, 68.97], [94.32, 69.32], [93.97, 69.47], [93.82, 69.82], [93.75, 69.85], [93.5, 69.75], [93.25, 69.85], [93.0, 69.75], [92.75, 69.85], [92.68, 69.82], [92.65, 69.75], [92.75, 69.5], [92.53, 68.97], [92.0, 68.75], [91.47, 68.97], [91.32, 69.32], [91.25, 69.35], [91.0, 69.25], [90.75, 69.35], [90.5, 69.25], [90.25, 69.35], [90.18, 69.32], [90.03, 68.97], [89.5, 68.75], [89.25, 68.85], [89.18, 68.82], [89.03, 68.47], [88.68, 68.32], [88.53, 67.97], [88.18, 67.82], [88.15, 67.75]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Russian-Arctic"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-12-03T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[91.97, 69.97], [91.75, 70.5], [91.97, 71.03], [92.5, 71.25], [92.75, 71.15], [93.0, 71.25], [93.25, 71.15], [93.5, 71.25], [93.75, 71.15], [93.82, 71.18], [93.97, 71.53], [94.5, 71.75], [94.75, 71.65], [95.0, 71.75], [95.53, 71.53], [95.75, 71.0], [95.53, 70.47], [95.0, 70.25], [94.75, 70.35], [94.68, 70.32], [94.53, 69.97], [94.0, 69.75], [93.75, 69.85], [93.5, 69.75], [93.25, 69.85], [93.0, 69.75], [92.75, 69.85], [92.5, 69.75], [91.97, 69.97]]], [[[95.97, 69.97], [95.75, 70.5], [95.97, 71.03], [96.5, 71.25], [96.75, 71.15], [97.0, 71.25], [97.25, 71.15], [97.5, 71.25], [97.75, 71.15], [98.0, 71.25], [98.3, 71.13], [98.47, 71.53], [99.0, 71.75], [99.25, 71.65], [99.5, 71.75], [99.75, 71.65], [100.0, 71.75], [100.53, 71.53], [100.75, 71.0], [100.53, 70.47], [100.0, 70.25], [99.75, 70.35], [99.68, 70.32], [99.53, 69.97], [99.0, 69.75], [98.5, 69.96], [98.0, 69.75], [97.75, 69.85], [97.5, 69.75], [97.25, 69.85], [97.0, 69.75], [96.75, 69.85], [96.5, 69.75], [95.97, 69.97]]]]}, "2025-12-04T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[89.5, 71.25], [89.75, 71.15], [90.0, 71.25], [90.25, 71.15], [90.5, 71.25], [90.75, 71.15], [91.0, 71.25], [91.25, 71.15], [91.5, 71.25], [91.75, 71.15], [92.0, 71.25], [92.25, 71.15], [92.5, 71.25], [92.75, 71.15], [93.0, 71.25], [93.25, 71.15], [93.5, 71.25], [93.75, 71.15], [93.82, 71.18], [93.97, 71.53], [94.5, 71.75], [94.75, 71.65], [95.0, 71.75], [95.53, 71.53], [95.75, 71.0], [95.65, 70.75], [95.75, 70.5], [95.65, 70.25], [95.75, 70.0], [95.65, 69.75], [95.75, 69.5], [95.53, 68.97], [95.0, 68.75], [94.47, 68.97], [94.32, 69.32], [93.97, 69.47], [93.82, 69.82], [93.75, 69.85], [93.5, 69.75], [93.25, 69.85], [93.0, 69.75], [92.75, 69.85], [92.68, 69.82], [92.65, 69.75], [92.75, 69.5], [92.53, 68.97], [92.0, 68.75], [91.47, 68.97], [91.32, 69.32], [91.25, 69.35], [91.0, 69.25], [90.75, 69.35], [90.5, 69.25], [90.25, 69.35], [90.0, 69.25], [89.75, 69.35], [89.5, 69.25], [89.25, 69.35], [89.0, 69.25], [88.47, 69.47], [88.25, 70.0], [88.47, 70.53], [88.82, 70.68], [88.97, 71.03], [89.5, 71.25]]], [[[96.5, 71.25], [96.75, 71.15], [97.0, 71.25], [97.25, 71.15], [97.5, 71.25], [97.75, 71.15], [98.0, 71.25], [98.25, 71.15], [98.32, 71.18], [98.47, 71.53], [99.0, 71.75], [99.25, 71.65], [99.5, 71.75], [99.75, 71.65], [100.0, 71.75], [100.53, 71.53], [100.75, 71.0], [100.53, 70.47], [100.18, 70.32], [100.03, 69.97], [99.5, 69.75], [99.25, 69.85], [99.0, 69.75], [98.75, 69.85], [98.68, 69.82], [98.53, 69.47], [98.0, 69.25], [97.47, 69.47], [97.32, 69.82], [97.25, 69.85], [97.0, 69.75], [96.75, 69.85], [96.5, 69.75], [95.97, 69.97], [95.75, 70.5], [95.97, 71.03], [96.5, 71.25]]]]}, "2025-12-05T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[86.25, 69.0], [86.47, 69.53], [86.82, 69.68], [86.85, 69.75], [86.75, 70.0], [86.97, 70.53], [87.5, 70.75], [87.75, 70.65], [88.0, 70.75], [88.25, 70.65], [88.5, 70.75], [88.75, 70.65], [88.82, 70.68], [88.97, 71.03], [89.5, 71.25], [89.75, 71.15], [90.0, 71.25], [90.25, 71.15], [90.5, 71.25], [90.75, 71.15], [91.0, 71.25], [91.25, 71.15], [91.5, 71.25], [91.75, 71.15], [92.0, 71.25], [92.25, 71.15], [92.5, 71.25], [92.75, 71.15], [93.0, 71.25], [93.25, 71.15], [93.5, 71.25], [93.75, 71.15], [93.82, 71.18], [93.97, 71.53], [94.5, 71.75], [94.75, 71.65], [95.0, 71.75], [95.53, 71.53], [95.75, 71.0], [95.65, 70.75], [95.68, 70.68], [95.75, 70.65], [95.82, 70.68], [95.97, 71.03], [96.5, 71.25], [96.75, 71.15], [97.0, 71.25], [97.25, 71.15], [97.5, 71.25], [97.75, 71.15], [98.0, 71.25], [98.25, 71.15], [98.32, 71.18], [98.47, 71.53], [99.0, 71.75], [99.25, 71.65], [99.5, 71.75], [99.75, 71.65], [100.0, 71.75], [100.53, 71.53], [100.75, 71.0], [100.53, 70.47], [100.18, 70.32], [100.03, 69.97], [99.5, 69.75], [99.25, 69.85], [99.18, 69.82], [99.03, 69.47], [98.5, 69.25], [98.25, 69.35], [98.0, 69.25], [97.75, 69.35], [97.5, 69.25], [97.0, 69.46], [96.5, 69.25], [96.25, 69.35], [96.0, 69.25], [95.75, 69.35], [95.68, 69.32], [95.53, 68.97], [95.0, 68.75], [94.47, 68.97], [94.32, 69.32], [93.97, 69.47], [93.82, 69.82], [93.75, 69.85], [93.5, 69.75], [93.25, 69.85], [93.0, 69.75], [92.75, 69.85], [92.68, 69.82], [92.65, 69.75], [92.75, 69.5], [92.53, 68.97], [92.0, 68.75], [91.47, 68.97], [91.32, 69.32], [91.25, 69.35], [91.0, 69.25], [90.75, 69.35], [90.5, 69.25], [90.25, 69.35], [90.18, 69.32], [90.03, 68.97], [89.5, 68.75], [89.25, 68.85], [89.18, 68.82], [89.03, 68.47], [88.68, 68.32], [88.53, 67.97], [88.0, 67.75], [87.75, 67.85], [87.5, 67.75], [87.25, 67.85], [87.0, 67.75], [86.47, 67.97], [86.25, 68.5], [86.35, 68.75], [86.25, 69.0]]]]}, "2025-12-06T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[86.25, 69.0], [86.47, 69.53], [86.82, 69.68], [86.85, 69.75], [86.75, 70.0], [86.97, 70.53], [87.5, 70.75], [87.75, 70.65], [88.0, 70.75], [88.25, 70.65], [88.5, 70.75], [88.75, 70.65], [88.82, 70.68], [88.97, 71.03], [89.5, 71.25], [89.75, 71.15], [90.0, 71.25], [90.25, 71.15], [90.5, 71.25], [90.75, 71.15], [91.0, 71.25], [91.25, 71.15], [91.5, 71.25], [91.75, 71.15], [92.0, 71.25], [92.25, 71.15], [92.5, 71.25], [92.75, 71.15], [93.0, 71.25], [93.25, 71.15], [93.5, 71.25], [93.75, 71.15], [94.0, 71.25], [94.25, 71.15], [94.5, 71.25], [94.75, 71.15], [95.0, 71.25], [95.53, 71.03], [95.68, 70.68], [95.75, 70.65], [95.82, 70.68], [95.97, 71.03], [96.5, 71.25], [96.75, 71.15], [97.0, 71.25], [97.25, 71.15], [97.5, 71.25], [97.75, 71.15], [98.0, 71.25], [98.25, 71.15], [98.5, 71.25], [98.75, 71.15], [99.0, 71.25], [99.25, 71.15], [99.32, 71.18], [99.47, 71.53], [100.0, 71.75], [100.53, 71.53], [100.75, 71.0], [100.53, 70.47], [100.18, 70.32], [100.03, 69.97], [99.5, 69.75], [99.25, 69.85], [99.18, 69.82], [99.03, 69.47], [98.5, 69.25], [98.25, 69.35], [98.0, 69.25], [97.75, 69.35], [97.5, 69.25], [97.0, 69.46], [96.5, 69.25], [96.25, 69.35], [96.0, 69.25], [95.75, 69.35], [95.68, 69.32], [95.53, 68.97], [95.0, 68.75], [94.47, 68.97], [94.32, 69.32], [93.97, 69.47], [93.82, 69.82], [93.75, 69.85], [93.5, 69.75], [93.25, 69.85], [93.0, 69.75], [92.75, 69.85], [92.68, 69.82], [92.65, 69.75], [92.75, 69.5], [92.53, 68.97], [92.0, 68.75], [91.47, 68.97], [91.32, 69.32], [91.25, 69.35], [91.0, 69.25], [90.75, 69.35], [90.5, 69.25], [90.25, 69.35], [90.18, 69.32], [90.03, 68.97], [89.5, 68.75], [89.25, 68.85], [89.18, 68.82], [89.03, 68.47], [88.68, 68.32], [88.53, 67.97], [88.18, 67.82], [88.15, 67.75], [88.18, 67.68], [88.53, 67.53], [88.75, 67.0], [88.53, 66.47], [88.0, 66.25], [87.47, 66.47], [87.32, 66.82], [86.97, 66.97], [86.75, 67.5], [86.85, 67.75], [86.82, 67.82], [86.47, 67.97], [86.25, 68.5], [86.35, 68.75], [86.25, 69.0]]]]}, "2025-12-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[86.47, 69.53], [86.82, 69.68], [86.85, 69.75], [86.75, 70.0], [86.97, 70.53], [87.5, 70.75], [87.75, 70.65], [88.0, 70.75], [88.25, 70.65], [88.5, 70.75], [88.75, 70.65], [89.0, 70.75], [89.25, 70.65], [89.5, 70.75], [89.75, 70.65], [90.0, 70.75], [90.25, 70.65], [90.5, 70.75], [90.75, 70.65], [91.0, 70.75], [91.25, 70.65], [91.5, 70.75], [91.75, 70.65], [92.0, 70.75], [92.53, 70.53], [92.75, 70.0], [92.65, 69.75], [92.75, 69.5], [92.53, 68.97], [92.0, 68.75], [91.47, 68.97], [91.32, 69.32], [91.25, 69.35], [91.0, 69.25], [90.75, 69.35], [90.5, 69.25], [90.25, 69.35], [90.18, 69.32], [90.03, 68.97], [89.5, 68.75], [89.25, 68.85], [89.18, 68.82], [89.03, 68.47], [88.68, 68.32], [88.53, 67.97], [88.18, 67.82], [88.15, 67.75], [88.18, 67.68], [88.53, 67.53], [88.75, 67.0], [88.53, 66.47], [88.0, 66.25], [87.47, 66.47], [87.32, 66.82], [86.97, 66.97], [86.75, 67.5], [86.85, 67.75], [86.82, 67.82], [86.47, 67.97], [86.25, 68.5], [86.35, 68.75], [86.25, 69.0], [86.47, 69.53]]], [[[94.47, 69.47], [94.25, 70.0], [94.47, 70.53], [95.0, 70.75], [95.25, 70.65], [95.5, 70.75], [95.75, 70.65], [96.0, 70.75], [96.25, 70.65], [96.5, 70.75], [97.0, 70.54], [97.5, 70.75], [97.75, 70.65], [98.0, 70.75], [98.25, 70.65], [98.5, 70.75], [99.03, 70.53], [99.25, 70.0], [99.03, 69.47], [98.5, 69.25], [98.25, 69.35], [98.0, 69.25], [97.75, 69.35], [97.5, 69.25], [97.0, 69.46], [96.5, 69.25], [96.25, 69.35], [96.0, 69.25], [95.75, 69.35], [95.5, 69.25], [95.25, 69.35], [95.0, 69.25], [94.47, 69.47]]]]}, "2025-12-08T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[86.75, 68.0], [86.85, 68.25], [86.75, 68.5], [86.97, 69.03], [87.5, 69.25], [87.75, 69.15], [88.0, 69.25], [88.53, 69.03], [88.75, 68.5], [88.53, 67.97], [88.18, 67.82], [88.15, 67.75], [88.18, 67.68], [88.53, 67.53], [88.75, 67.0], [88.53, 66.47], [88.0, 66.25], [87.47, 66.47], [87.32, 66.82], [86.97, 66.97], [86.75, 67.5], [86.85, 67.75], [86.75, 68.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -20.7497173846059}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -12.346736811157689}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-37.37325252351303, -36.84946289062498, -38.41238150823682, -37.543643477468805, -37.63498939745352, -36.14664217631022]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-40.86186510721839, -40.22965087890623, -41.03185056050617, -44.361023330688454, -44.93219731648762, -38.370584233601875]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-11.584555600072372, -11.331760019791005, -13.026294706211997, -12.371002604975095, -12.626618852559146, -12.063483470187283]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-13.16065321651962, -14.93574003104328, -16.9628839380197, -20.7497173846059, -20.540255854038207, -13.62478476815346]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.307431359520178, -1.4310029947161236, -1.679499624097206, -1.6061445711455777, -1.6207910018421152, -1.3478588632149506]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.3880666641454447, -1.709050821936303, -2.160872321675008, -2.17270489528248, -2.140665819965599, -1.3960101745409028]}}