{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:08:49.265703", "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-19_to_2025-Nov-21_180.0_63.5"}, "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": 2025110000554}, "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 19 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "November 21 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": 75790.42824162774}, "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": ["Bering Sea"]}, "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": 63.5}, "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": 180.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "180.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 177.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 183.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 61.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 66.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-178.82, 66.18], [-178.47, 66.03], [-178.25, 65.5], [-178.35, 65.25], [-178.25, 65.0], [-178.35, 64.75], [-178.32, 64.68], [-177.97, 64.53], [-177.82, 64.18], [-177.47, 64.03], [-177.25, 63.5], [-177.35, 63.25], [-177.32, 63.18], [-176.97, 63.03], [-176.75, 62.5], [-176.85, 62.25], [-176.75, 62.0], [-176.85, 61.75], [-176.82, 61.68], [-176.47, 61.53], [-176.25, 61.0], [-176.47, 60.47], [-177.0, 60.25], [-177.25, 60.35], [-177.5, 60.25], [-178.0, 60.46], [-178.5, 60.25], [-179.03, 60.47], [-179.25, 61.0], [-179.15, 61.25], [-179.18, 61.32], [-179.53, 61.47], [-179.75, 62.0], [-179.65, 62.25], [-179.75, 62.5], [-179.97, 61.97], [-180.0, 61.96], [-180.0, 66.54], [-179.5, 66.75], [-178.97, 66.53], [-178.82, 66.18]], [[-179.65, 62.75], [-179.68, 62.82], [-179.75, 62.85], [-179.82, 62.82], [-179.85, 62.75], [-179.75, 62.5], [-179.65, 62.75]]], [[[176.47, 65.03], [177.0, 65.25], [177.25, 65.15], [177.32, 65.18], [177.47, 65.53], [178.0, 65.75], [178.25, 65.65], [178.5, 65.75], [178.75, 65.65], [179.0, 65.75], [179.25, 65.65], [179.32, 65.68], [179.47, 66.03], [179.82, 66.18], [179.97, 66.53], [180.0, 66.54], [180.0, 61.96], [179.5, 61.75], [179.25, 61.85], [179.0, 61.75], [178.75, 61.85], [178.5, 61.75], [177.97, 61.97], [177.75, 62.5], [177.97, 63.03], [178.32, 63.18], [178.35, 63.25], [178.32, 63.32], [177.97, 63.47], [177.82, 63.82], [177.75, 63.85], [177.5, 63.75], [177.25, 63.85], [177.0, 63.75], [176.47, 63.97], [176.25, 64.5], [176.47, 65.03]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Russian-Arctic", "Russian-Far-East", "N.Pacific-Ocean"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-11-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[177.0, 63.75], [176.47, 63.97], [176.25, 64.5], [176.47, 65.03], [177.0, 65.25], [177.25, 65.15], [177.32, 65.18], [177.47, 65.53], [178.0, 65.75], [178.25, 65.65], [178.5, 65.75], [178.75, 65.65], [179.0, 65.75], [179.25, 65.65], [179.32, 65.68], [179.47, 66.03], [179.82, 66.18], [179.97, 66.53], [180.0, 66.54], [180.0, 61.96], [179.5, 61.75], [179.25, 61.85], [179.0, 61.75], [178.75, 61.85], [178.5, 61.75], [177.97, 61.97], [177.75, 62.5], [177.97, 63.03], [178.32, 63.18], [178.35, 63.25], [178.32, 63.32], [177.97, 63.47], [177.82, 63.82], [177.75, 63.85], [177.5, 63.75], [177.25, 63.85], [177.0, 63.75]]], [[[-180.0, 66.54], [-179.5, 66.75], [-178.97, 66.53], [-178.82, 66.18], [-178.47, 66.03], [-178.25, 65.5], [-178.35, 65.25], [-178.25, 65.0], [-178.35, 64.75], [-178.32, 64.68], [-177.97, 64.53], [-177.82, 64.18], [-177.47, 64.03], [-177.25, 63.5], [-177.35, 63.25], [-177.32, 63.18], [-176.97, 63.03], [-176.75, 62.5], [-176.85, 62.25], [-176.75, 62.0], [-176.85, 61.75], [-176.82, 61.68], [-176.47, 61.53], [-176.25, 61.0], [-176.47, 60.47], [-177.0, 60.25], [-177.25, 60.35], [-177.5, 60.25], [-178.0, 60.46], [-178.5, 60.25], [-179.03, 60.47], [-179.25, 61.0], [-179.15, 61.25], [-179.18, 61.32], [-179.53, 61.47], [-179.75, 62.0], [-179.65, 62.25], [-179.75, 62.5], [-179.97, 61.97], [-180.0, 61.96], [-180.0, 66.54]], [[-179.65, 62.75], [-179.68, 62.82], [-179.75, 62.85], [-179.82, 62.82], [-179.85, 62.75], [-179.75, 62.5], [-179.65, 62.75]]]]}, "2025-11-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[177.0, 63.75], [176.47, 63.97], [176.25, 64.5], [176.47, 65.03], [177.0, 65.25], [177.25, 65.15], [177.32, 65.18], [177.47, 65.53], [178.0, 65.75], [178.25, 65.65], [178.5, 65.75], [178.75, 65.65], [179.0, 65.75], [179.25, 65.65], [179.32, 65.68], [179.47, 66.03], [179.82, 66.18], [179.97, 66.53], [180.0, 66.54], [180.0, 61.96], [179.5, 61.75], [179.25, 61.85], [179.0, 61.75], [178.75, 61.85], [178.5, 61.75], [177.97, 61.97], [177.75, 62.5], [177.97, 63.03], [178.32, 63.18], [178.35, 63.25], [178.32, 63.32], [177.97, 63.47], [177.82, 63.82], [177.75, 63.85], [177.5, 63.75], [177.25, 63.85], [177.0, 63.75]]], [[[-180.0, 66.54], [-179.5, 66.75], [-178.97, 66.53], [-178.82, 66.18], [-178.47, 66.03], [-178.25, 65.5], [-178.35, 65.25], [-178.25, 65.0], [-178.35, 64.75], [-178.32, 64.68], [-177.97, 64.53], [-177.82, 64.18], [-177.47, 64.03], [-177.25, 63.5], [-177.35, 63.25], [-177.32, 63.18], [-176.97, 63.03], [-176.75, 62.5], [-176.85, 62.25], [-176.75, 62.0], [-176.85, 61.75], [-176.82, 61.68], [-176.47, 61.53], [-176.25, 61.0], [-176.47, 60.47], [-177.0, 60.25], [-177.25, 60.35], [-177.5, 60.25], [-178.0, 60.46], [-178.5, 60.25], [-179.03, 60.47], [-179.25, 61.0], [-179.15, 61.25], [-179.18, 61.32], [-179.53, 61.47], [-179.75, 62.0], [-179.65, 62.25], [-179.75, 62.5], [-179.97, 61.97], [-180.0, 61.96], [-180.0, 66.54]], [[-179.65, 62.75], [-179.68, 62.82], [-179.75, 62.85], [-179.82, 62.82], [-179.85, 62.75], [-179.75, 62.5], [-179.65, 62.75]]]]}, "2025-11-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[177.0, 63.75], [176.47, 63.97], [176.25, 64.5], [176.47, 65.03], [177.0, 65.25], [177.25, 65.15], [177.32, 65.18], [177.47, 65.53], [178.0, 65.75], [178.25, 65.65], [178.5, 65.75], [178.75, 65.65], [179.0, 65.75], [179.25, 65.65], [179.32, 65.68], [179.47, 66.03], [179.82, 66.18], [179.97, 66.53], [180.0, 66.54], [180.0, 61.96], [179.5, 61.75], [179.25, 61.85], [179.0, 61.75], [178.75, 61.85], [178.5, 61.75], [177.97, 61.97], [177.75, 62.5], [177.97, 63.03], [178.32, 63.18], [178.35, 63.25], [178.32, 63.32], [177.97, 63.47], [177.82, 63.82], [177.75, 63.85], [177.5, 63.75], [177.25, 63.85], [177.0, 63.75]]], [[[-180.0, 66.54], [-179.5, 66.75], [-178.97, 66.53], [-178.82, 66.18], [-178.47, 66.03], [-178.25, 65.5], [-178.35, 65.25], [-178.25, 65.0], [-178.35, 64.75], [-178.32, 64.68], [-177.97, 64.53], [-177.82, 64.18], [-177.47, 64.03], [-177.25, 63.5], [-177.35, 63.25], [-177.32, 63.18], [-176.97, 63.03], [-176.75, 62.5], [-176.85, 62.25], [-176.75, 62.0], [-176.85, 61.75], [-176.82, 61.68], [-176.47, 61.53], [-176.25, 61.0], [-176.47, 60.47], [-177.0, 60.25], [-177.25, 60.35], [-177.5, 60.25], [-178.0, 60.46], [-178.5, 60.25], [-179.03, 60.47], [-179.25, 61.0], [-179.15, 61.25], [-179.18, 61.32], [-179.53, 61.47], [-179.75, 62.0], [-179.65, 62.25], [-179.75, 62.5], [-179.97, 61.97], [-180.0, 61.96], [-180.0, 66.54]], [[-179.65, 62.75], [-179.68, 62.82], [-179.75, 62.85], [-179.82, 62.82], [-179.85, 62.75], [-179.75, 62.5], [-179.65, 62.75]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -19.123023420301138}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -8.323981539406134}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-12.930085407603826, -14.319451511267403, -13.1993154583555]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-32.69112116495765, -32.00199864705402, -28.367521667480446]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-7.951407750052718, -9.220970858136385, -7.799566010029298]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-19.123023420301138, -17.841495012202785, -13.594689311466027]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.7226561193490502, -2.1072938513098483, -1.8644060336898587]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.3048911243177996, -2.6871615685836363, -2.420534348111681]}}