{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:28:29.188916", "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": "2021-Dec-10_to_2021-Dec-14_181.5_67.5"}, "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": 2021120000360}, "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 10 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 14 2021"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 5}, "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": 101500.69207204043}, "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"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.Pacific-Ocean", "Russian-Arctic"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["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": ["Bering Sea", "Chukchi 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": 67.5}, "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": 181.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "181.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 179.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 191.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 64.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 68.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-12-10T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[180.0, 67.75], [180.0, 66.25], [179.47, 66.47], [179.25, 67.0], [179.47, 67.53], [180.0, 67.75]]], [[[-179.47, 67.53], [-179.25, 67.0], [-179.47, 66.47], [-180.0, 66.25], [-180.0, 67.75], [-179.47, 67.53]]]]}, "2021-12-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-172.75, 65.5], [-172.53, 66.03], [-172.0, 66.25], [-171.75, 66.15], [-171.5, 66.25], [-171.25, 66.15], [-171.0, 66.25], [-170.75, 66.15], [-170.5, 66.25], [-170.25, 66.15], [-170.0, 66.25], [-169.47, 66.03], [-169.32, 65.68], [-168.97, 65.53], [-168.82, 65.18], [-168.47, 65.03], [-168.25, 64.5], [-168.47, 63.97], [-169.0, 63.75], [-169.25, 63.85], [-169.5, 63.75], [-169.75, 63.85], [-170.0, 63.75], [-170.25, 63.85], [-170.5, 63.75], [-171.03, 63.97], [-171.18, 64.32], [-171.53, 64.47], [-171.68, 64.82], [-171.75, 64.85], [-172.0, 64.75], [-172.53, 64.97], [-172.75, 65.5]]], [[[-174.25, 65.5], [-174.47, 64.97], [-175.0, 64.75], [-175.53, 64.97], [-175.75, 65.5], [-175.53, 66.03], [-175.0, 66.25], [-174.47, 66.03], [-174.25, 65.5]]], [[[-179.75, 68.15], [-179.5, 68.25], [-179.25, 68.15], [-179.0, 68.25], [-178.75, 68.15], [-178.5, 68.25], [-178.25, 68.15], [-178.0, 68.25], [-177.47, 68.03], [-177.25, 67.5], [-177.35, 67.25], [-177.32, 67.18], [-176.97, 67.03], [-176.82, 66.68], [-176.47, 66.53], [-176.32, 66.18], [-175.97, 66.03], [-175.75, 65.5], [-175.97, 64.97], [-176.5, 64.75], [-176.75, 64.85], [-177.0, 64.75], [-177.53, 64.97], [-177.68, 65.32], [-178.0, 65.46], [-178.5, 65.25], [-178.75, 65.35], [-179.0, 65.25], [-179.53, 65.47], [-179.75, 66.0], [-179.65, 66.25], [-179.68, 66.32], [-179.75, 66.35], [-180.0, 66.25], [-180.0, 68.25], [-179.75, 68.15]]], [[[179.47, 66.47], [179.25, 67.0], [179.35, 67.25], [179.25, 67.5], [179.47, 68.03], [180.0, 68.25], [180.0, 66.25], [179.47, 66.47]]]]}, "2021-12-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[179.47, 68.03], [179.88, 68.2], [179.75, 68.5], [179.97, 69.03], [180.0, 69.04], [180.0, 65.96], [179.97, 65.97], [179.82, 66.32], [179.47, 66.47], [179.25, 67.0], [179.35, 67.25], [179.25, 67.5], [179.47, 68.03]]], [[[-179.5, 69.25], [-179.25, 69.15], [-179.0, 69.25], [-178.47, 69.03], [-178.32, 68.68], [-178.25, 68.65], [-178.0, 68.75], [-177.75, 68.65], [-177.5, 68.75], [-177.25, 68.65], [-177.0, 68.75], [-176.75, 68.65], [-176.5, 68.75], [-176.25, 68.65], [-176.0, 68.75], [-175.47, 68.53], [-175.32, 68.18], [-174.97, 68.03], [-174.82, 67.68], [-174.47, 67.53], [-174.3, 67.13], [-174.0, 67.25], [-173.75, 67.15], [-173.5, 67.25], [-173.25, 67.15], [-173.0, 67.25], [-172.75, 67.15], [-172.5, 67.25], [-172.25, 67.15], [-172.0, 67.25], [-171.75, 67.15], [-171.5, 67.25], [-171.25, 67.15], [-171.0, 67.25], [-170.47, 67.03], [-170.32, 66.68], [-170.25, 66.65], [-170.0, 66.75], [-169.47, 66.53], [-169.32, 66.18], [-168.97, 66.03], [-168.82, 65.68], [-168.47, 65.53], [-168.25, 65.0], [-168.35, 64.75], [-168.25, 64.5], [-168.47, 63.97], [-169.0, 63.75], [-169.25, 63.85], [-169.5, 63.75], [-169.75, 63.85], [-170.0, 63.75], [-170.25, 63.85], [-170.5, 63.75], [-171.03, 63.97], [-171.18, 64.32], [-171.53, 64.47], [-171.68, 64.82], [-171.75, 64.85], [-172.0, 64.75], [-172.25, 64.85], [-172.5, 64.75], [-172.75, 64.85], [-173.0, 64.75], [-173.25, 64.85], [-173.5, 64.75], [-173.75, 64.85], [-174.0, 64.75], [-174.25, 64.85], [-174.5, 64.75], [-174.75, 64.85], [-175.0, 64.75], [-175.53, 64.97], [-175.75, 65.5], [-175.97, 64.97], [-176.5, 64.75], [-176.75, 64.85], [-177.0, 64.75], [-177.53, 64.97], [-177.68, 65.32], [-178.0, 65.46], [-178.5, 65.25], [-178.75, 65.35], [-179.0, 65.25], [-179.53, 65.47], [-179.68, 65.82], [-180.0, 65.96], [-180.0, 69.04], [-179.5, 69.25]], [[-175.65, 65.75], [-175.68, 65.82], [-175.75, 65.85], [-175.87, 65.8], [-175.75, 65.5], [-175.65, 65.75]]]]}, "2021-12-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[179.25, 67.5], [179.47, 68.03], [179.88, 68.2], [179.75, 68.5], [179.97, 69.03], [180.0, 69.04], [180.0, 65.96], [179.97, 65.97], [179.75, 66.5], [179.85, 66.75], [179.82, 66.82], [179.47, 66.97], [179.25, 67.5]]], [[[-179.5, 69.25], [-179.25, 69.15], [-179.0, 69.25], [-178.47, 69.03], [-178.32, 68.68], [-178.25, 68.65], [-178.0, 68.75], [-177.75, 68.65], [-177.5, 68.75], [-177.25, 68.65], [-177.0, 68.75], [-176.75, 68.65], [-176.5, 68.75], [-176.25, 68.65], [-176.0, 68.75], [-175.47, 68.53], [-175.32, 68.18], [-174.97, 68.03], [-174.82, 67.68], [-174.47, 67.53], [-174.3, 67.13], [-174.0, 67.25], [-173.75, 67.15], [-173.5, 67.25], [-173.25, 67.15], [-173.0, 67.25], [-172.75, 67.15], [-172.5, 67.25], [-172.25, 67.15], [-172.0, 67.25], [-171.75, 67.15], [-171.5, 67.25], [-171.25, 67.15], [-171.0, 67.25], [-170.47, 67.03], [-170.32, 66.68], [-170.25, 66.65], [-170.0, 66.75], [-169.47, 66.53], [-169.32, 66.18], [-168.97, 66.03], [-168.82, 65.68], [-168.47, 65.53], [-168.25, 65.0], [-168.35, 64.75], [-168.25, 64.5], [-168.47, 63.97], [-169.0, 63.75], [-169.25, 63.85], [-169.5, 63.75], [-169.75, 63.85], [-170.0, 63.75], [-170.25, 63.85], [-170.5, 63.75], [-171.03, 63.97], [-171.18, 64.32], [-171.53, 64.47], [-171.68, 64.82], [-171.75, 64.85], [-172.0, 64.75], [-172.25, 64.85], [-172.5, 64.75], [-172.75, 64.85], [-173.0, 64.75], [-173.25, 64.85], [-173.5, 64.75], [-173.75, 64.85], [-174.0, 64.75], [-174.25, 64.85], [-174.5, 64.75], [-174.75, 64.85], [-175.0, 64.75], [-175.53, 64.97], [-175.75, 65.5], [-175.97, 64.97], [-176.5, 64.75], [-176.75, 64.85], [-177.0, 64.75], [-177.53, 64.97], [-177.68, 65.32], [-178.0, 65.46], [-178.5, 65.25], [-178.75, 65.35], [-179.0, 65.25], [-179.53, 65.47], [-179.68, 65.82], [-180.0, 65.96], [-180.0, 69.04], [-179.5, 69.25]], [[-175.65, 65.75], [-175.68, 65.82], [-175.75, 65.85], [-175.87, 65.8], [-175.75, 65.5], [-175.65, 65.75]]]]}, "2021-12-14T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[179.25, 67.5], [179.47, 68.03], [179.88, 68.2], [179.75, 68.5], [179.97, 69.03], [180.0, 69.04], [180.0, 65.96], [179.97, 65.97], [179.75, 66.5], [179.88, 66.8], [179.47, 66.97], [179.25, 67.5]]], [[[-179.5, 69.25], [-179.25, 69.15], [-179.0, 69.25], [-178.47, 69.03], [-178.32, 68.68], [-178.25, 68.65], [-178.0, 68.75], [-177.75, 68.65], [-177.5, 68.75], [-177.25, 68.65], [-177.0, 68.75], [-176.75, 68.65], [-176.5, 68.75], [-176.25, 68.65], [-176.0, 68.75], [-175.47, 68.53], [-175.32, 68.18], [-174.97, 68.03], [-174.82, 67.68], [-174.47, 67.53], [-174.3, 67.13], [-174.0, 67.25], [-173.75, 67.15], [-173.5, 67.25], [-173.25, 67.15], [-173.0, 67.25], [-172.75, 67.15], [-172.5, 67.25], [-172.25, 67.15], [-172.0, 67.25], [-171.75, 67.15], [-171.5, 67.25], [-171.25, 67.15], [-171.0, 67.25], [-170.47, 67.03], [-170.32, 66.68], [-170.25, 66.65], [-170.0, 66.75], [-169.47, 66.53], [-169.32, 66.18], [-168.97, 66.03], [-168.82, 65.68], [-168.47, 65.53], [-168.25, 65.0], [-168.35, 64.75], [-168.25, 64.5], [-168.47, 63.97], [-169.0, 63.75], [-169.25, 63.85], [-169.5, 63.75], [-169.75, 63.85], [-170.0, 63.75], [-170.25, 63.85], [-170.5, 63.75], [-171.03, 63.97], [-171.18, 64.32], [-171.53, 64.47], [-171.68, 64.82], [-171.75, 64.85], [-172.0, 64.75], [-172.25, 64.85], [-172.5, 64.75], [-172.75, 64.85], [-173.0, 64.75], [-173.25, 64.85], [-173.5, 64.75], [-173.75, 64.85], [-174.0, 64.75], [-174.25, 64.85], [-174.5, 64.75], [-174.75, 64.85], [-175.0, 64.75], [-175.53, 64.97], [-175.75, 65.5], [-175.65, 65.75], [-175.68, 65.82], [-175.75, 65.85], [-176.0, 65.75], [-176.25, 65.85], [-176.5, 65.75], [-176.75, 65.85], [-177.0, 65.75], [-177.25, 65.85], [-177.5, 65.75], [-178.0, 65.96], [-178.32, 65.82], [-178.47, 65.47], [-179.0, 65.25], [-179.53, 65.47], [-179.68, 65.82], [-180.0, 65.96], [-180.0, 69.04], [-179.5, 69.25]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -20.78539767191029}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -13.100255258732398}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-33.26493899307687, -28.097005112869397, -30.449096280649, -30.98564294141906, -31.166698916849214]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-33.26493899307687, -38.23960728859751, -43.19686677543393, -40.07245794863448, -37.90904235160528]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-11.723876892433367, -11.650772480415002, -13.040197198877994, -13.468398562403994, -13.42444810355152]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-11.723876892433367, -15.969764208749382, -20.78539767191029, -19.54394539331841, -18.305721571993104]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3180308589450287, -1.5259777018267386, -1.6388908858022868, -1.6681044101687192, -1.6554211464331745]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.3180308589450287, -1.8382310785819962, -2.296912816895296, -2.1874529205809976, -2.0882086447574495]}}