{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:05:54.617874", "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-Jun-30_to_2025-Jul-02_157.5_64.0"}, "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": 2025060001026}, "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": "June 30 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "July 02 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": 52516.93270569097}, "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": 64.0}, "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": 157.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "157.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 155.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 159.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 63.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 66.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[154.47, 64.53], [154.82, 64.68], [154.85, 64.75], [154.75, 65.0], [154.97, 65.53], [155.32, 65.68], [155.47, 66.03], [156.0, 66.25], [156.25, 66.15], [156.32, 66.18], [156.47, 66.53], [156.82, 66.68], [156.97, 67.03], [157.5, 67.25], [157.75, 67.15], [158.0, 67.25], [158.25, 67.15], [158.5, 67.25], [159.03, 67.03], [159.25, 66.5], [159.15, 66.25], [159.25, 66.0], [159.15, 65.75], [159.25, 65.5], [159.15, 65.25], [159.18, 65.18], [159.25, 65.15], [159.5, 65.25], [160.03, 65.03], [160.25, 64.5], [160.03, 63.97], [159.5, 63.75], [159.25, 63.85], [159.18, 63.82], [159.03, 63.47], [158.5, 63.25], [158.25, 63.35], [158.0, 63.25], [157.75, 63.35], [157.5, 63.25], [157.25, 63.35], [157.18, 63.32], [157.03, 62.97], [156.5, 62.75], [156.25, 62.85], [156.0, 62.75], [155.75, 62.85], [155.5, 62.75], [154.97, 62.97], [154.82, 63.32], [154.47, 63.47], [154.25, 64.0], [154.47, 64.53]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Russian-Arctic", "Russian-Far-East"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-06-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[154.47, 63.47], [154.25, 64.0], [154.47, 64.53], [154.82, 64.68], [154.85, 64.75], [154.75, 65.0], [154.97, 65.53], [155.32, 65.68], [155.47, 66.03], [156.0, 66.25], [156.25, 66.15], [156.32, 66.18], [156.47, 66.53], [156.82, 66.68], [156.97, 67.03], [157.5, 67.25], [157.75, 67.15], [158.0, 67.25], [158.25, 67.15], [158.5, 67.25], [159.03, 67.03], [159.25, 66.5], [159.15, 66.25], [159.25, 66.0], [159.15, 65.75], [159.25, 65.5], [159.15, 65.25], [159.18, 65.18], [159.25, 65.15], [159.5, 65.25], [160.03, 65.03], [160.25, 64.5], [160.03, 63.97], [159.5, 63.75], [159.25, 63.85], [159.18, 63.82], [159.03, 63.47], [158.5, 63.25], [158.25, 63.35], [158.0, 63.25], [157.75, 63.35], [157.5, 63.25], [157.25, 63.35], [157.18, 63.32], [157.03, 62.97], [156.5, 62.75], [156.25, 62.85], [156.0, 62.75], [155.75, 62.85], [155.5, 62.75], [154.97, 62.97], [154.82, 63.32], [154.47, 63.47]]]]}, "2025-07-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[154.47, 63.47], [154.25, 64.0], [154.47, 64.53], [154.82, 64.68], [154.85, 64.75], [154.75, 65.0], [154.97, 65.53], [155.32, 65.68], [155.47, 66.03], [156.0, 66.25], [156.25, 66.15], [156.32, 66.18], [156.47, 66.53], [156.82, 66.68], [156.97, 67.03], [157.5, 67.25], [157.75, 67.15], [158.0, 67.25], [158.25, 67.15], [158.5, 67.25], [159.03, 67.03], [159.25, 66.5], [159.15, 66.25], [159.25, 66.0], [159.15, 65.75], [159.25, 65.5], [159.15, 65.25], [159.18, 65.18], [159.25, 65.15], [159.5, 65.25], [160.03, 65.03], [160.25, 64.5], [160.03, 63.97], [159.5, 63.75], [159.25, 63.85], [159.18, 63.82], [159.03, 63.47], [158.5, 63.25], [158.25, 63.35], [158.0, 63.25], [157.75, 63.35], [157.5, 63.25], [157.25, 63.35], [157.18, 63.32], [157.03, 62.97], [156.5, 62.75], [156.25, 62.85], [156.0, 62.75], [155.75, 62.85], [155.5, 62.75], [154.97, 62.97], [154.82, 63.32], [154.47, 63.47]]]]}, "2025-07-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[154.47, 63.47], [154.25, 64.0], [154.47, 64.53], [154.82, 64.68], [154.85, 64.75], [154.75, 65.0], [154.97, 65.53], [155.32, 65.68], [155.47, 66.03], [156.0, 66.25], [156.25, 66.15], [156.32, 66.18], [156.47, 66.53], [156.82, 66.68], [156.97, 67.03], [157.5, 67.25], [157.75, 67.15], [158.0, 67.25], [158.25, 67.15], [158.5, 67.25], [159.03, 67.03], [159.25, 66.5], [159.15, 66.25], [159.25, 66.0], [159.15, 65.75], [159.25, 65.5], [159.15, 65.25], [159.18, 65.18], [159.25, 65.15], [159.5, 65.25], [160.03, 65.03], [160.25, 64.5], [160.03, 63.97], [159.5, 63.75], [159.25, 63.85], [159.18, 63.82], [159.03, 63.47], [158.5, 63.25], [158.25, 63.35], [158.0, 63.25], [157.75, 63.35], [157.5, 63.25], [157.25, 63.35], [157.18, 63.32], [157.03, 62.97], [156.5, 62.75], [156.25, 62.85], [156.0, 62.75], [155.75, 62.85], [155.5, 62.75], [154.97, 62.97], [154.82, 63.32], [154.47, 63.47]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -9.146080212958168}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -7.094668038303024}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [7.104095204671239, 5.534148915608739, 6.570856730143191]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [4.843137359619163, 1.8017860412597884, 2.7581471761067746]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-6.2578875448814815, -7.93347291850021, -7.092643651527378]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-7.812373522727455, -9.146080212958168, -8.42799757425729]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.583233349682164, -2.0424478328390574, -1.8195528298636638]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.8339071007138095, -2.4455762698843624, -2.216585550624855]}}