{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-05-20 10:52:28.967483", "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": "2026-Apr-20_to_2026-Apr-24_36.5_50.0"}, "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": 2026040000619}, "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": "April 20 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 24 2026"}, "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": 164220.99188664375}, "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", "Ukraine"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Europe", "West&Central-Europe"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Asia", "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": 50.0}, "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": 36.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "36.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 34.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 44.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 48.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 53.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-04-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[34.47, 50.03], [34.82, 50.18], [34.97, 50.53], [35.32, 50.68], [35.47, 51.03], [36.0, 51.25], [36.25, 51.15], [36.5, 51.25], [36.75, 51.15], [37.0, 51.25], [37.25, 51.15], [37.32, 51.18], [37.47, 51.53], [38.0, 51.75], [38.25, 51.65], [38.5, 51.75], [38.75, 51.65], [39.0, 51.75], [39.25, 51.65], [39.5, 51.75], [39.75, 51.65], [39.82, 51.68], [39.97, 52.03], [40.5, 52.25], [40.75, 52.15], [41.0, 52.25], [41.25, 52.15], [41.5, 52.25], [41.75, 52.15], [41.82, 52.18], [41.97, 52.53], [42.32, 52.68], [42.47, 53.03], [42.82, 53.18], [42.97, 53.53], [43.5, 53.75], [43.75, 53.65], [44.0, 53.75], [44.25, 53.65], [44.5, 53.75], [45.03, 53.53], [45.25, 53.0], [45.03, 52.47], [44.68, 52.32], [44.53, 51.97], [44.18, 51.82], [44.03, 51.47], [43.5, 51.25], [43.25, 51.35], [43.18, 51.32], [43.13, 51.2], [43.53, 51.03], [43.68, 50.68], [44.03, 50.53], [44.25, 50.0], [44.03, 49.47], [43.68, 49.32], [43.53, 48.97], [43.18, 48.82], [43.03, 48.47], [42.5, 48.25], [42.25, 48.35], [42.0, 48.25], [41.75, 48.35], [41.5, 48.25], [41.25, 48.35], [41.18, 48.32], [41.03, 47.97], [40.5, 47.75], [40.25, 47.85], [40.0, 47.75], [39.75, 47.85], [39.5, 47.75], [39.25, 47.85], [39.0, 47.75], [38.47, 47.97], [38.32, 48.32], [37.97, 48.47], [37.82, 48.82], [37.75, 48.85], [37.5, 48.75], [37.25, 48.85], [37.0, 48.75], [36.75, 48.85], [36.68, 48.82], [36.53, 48.47], [36.0, 48.25], [35.75, 48.35], [35.5, 48.25], [35.25, 48.35], [35.0, 48.25], [34.47, 48.47], [34.25, 49.0], [34.35, 49.25], [34.25, 49.5], [34.47, 50.03]], [[41.32, 50.68], [41.38, 50.8], [41.25, 50.85], [41.18, 50.82], [41.15, 50.75], [41.18, 50.68], [41.25, 50.65], [41.32, 50.68]]]]}, "2026-04-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[34.47, 50.03], [34.82, 50.18], [34.97, 50.53], [35.32, 50.68], [35.47, 51.03], [36.0, 51.25], [36.25, 51.15], [36.5, 51.25], [36.75, 51.15], [37.0, 51.25], [37.25, 51.15], [37.32, 51.18], [37.47, 51.53], [38.0, 51.75], [38.25, 51.65], [38.5, 51.75], [38.75, 51.65], [39.0, 51.75], [39.25, 51.65], [39.5, 51.75], [39.75, 51.65], [39.82, 51.68], [39.97, 52.03], [40.5, 52.25], [40.75, 52.15], [41.0, 52.25], [41.25, 52.15], [41.5, 52.25], [41.75, 52.15], [41.82, 52.18], [41.97, 52.53], [42.32, 52.68], [42.47, 53.03], [42.82, 53.18], [42.97, 53.53], [43.5, 53.75], [43.75, 53.65], [44.0, 53.75], [44.25, 53.65], [44.5, 53.75], [45.03, 53.53], [45.25, 53.0], [45.03, 52.47], [44.68, 52.32], [44.53, 51.97], [44.18, 51.82], [44.03, 51.47], [43.5, 51.25], [43.25, 51.35], [43.18, 51.32], [43.13, 51.2], [43.53, 51.03], [43.68, 50.68], [44.03, 50.53], [44.25, 50.0], [44.03, 49.47], [43.68, 49.32], [43.53, 48.97], [43.18, 48.82], [43.03, 48.47], [42.5, 48.25], [42.25, 48.35], [42.0, 48.25], [41.75, 48.35], [41.5, 48.25], [41.25, 48.35], [41.18, 48.32], [41.03, 47.97], [40.5, 47.75], [40.25, 47.85], [40.0, 47.75], [39.75, 47.85], [39.5, 47.75], [39.25, 47.85], [39.0, 47.75], [38.47, 47.97], [38.32, 48.32], [37.97, 48.47], [37.82, 48.82], [37.75, 48.85], [37.5, 48.75], [37.25, 48.85], [37.0, 48.75], [36.75, 48.85], [36.68, 48.82], [36.53, 48.47], [36.0, 48.25], [35.75, 48.35], [35.5, 48.25], [35.25, 48.35], [35.0, 48.25], [34.47, 48.47], [34.25, 49.0], [34.35, 49.25], [34.25, 49.5], [34.47, 50.03]], [[41.32, 50.68], [41.38, 50.8], [41.25, 50.85], [41.18, 50.82], [41.15, 50.75], [41.18, 50.68], [41.25, 50.65], [41.32, 50.68]]]]}, "2026-04-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[34.47, 50.03], [34.82, 50.18], [34.97, 50.53], [35.32, 50.68], [35.47, 51.03], [36.0, 51.25], [36.25, 51.15], [36.5, 51.25], [36.75, 51.15], [37.0, 51.25], [37.25, 51.15], [37.32, 51.18], [37.47, 51.53], [38.0, 51.75], [38.25, 51.65], [38.5, 51.75], [38.75, 51.65], [39.0, 51.75], [39.25, 51.65], [39.5, 51.75], [39.75, 51.65], [39.82, 51.68], [39.97, 52.03], [40.5, 52.25], [40.75, 52.15], [41.0, 52.25], [41.25, 52.15], [41.5, 52.25], [41.75, 52.15], [41.82, 52.18], [41.97, 52.53], [42.32, 52.68], [42.47, 53.03], [42.82, 53.18], [42.97, 53.53], [43.5, 53.75], [43.75, 53.65], [44.0, 53.75], [44.25, 53.65], [44.5, 53.75], [45.03, 53.53], [45.25, 53.0], [45.03, 52.47], [44.68, 52.32], [44.53, 51.97], [44.18, 51.82], [44.03, 51.47], [43.5, 51.25], [43.25, 51.35], [43.18, 51.32], [43.13, 51.2], [43.53, 51.03], [43.68, 50.68], [44.03, 50.53], [44.25, 50.0], [44.03, 49.47], [43.68, 49.32], [43.53, 48.97], [43.18, 48.82], [43.03, 48.47], [42.5, 48.25], [42.25, 48.35], [42.0, 48.25], [41.75, 48.35], [41.5, 48.25], [41.25, 48.35], [41.18, 48.32], [41.03, 47.97], [40.5, 47.75], [40.25, 47.85], [40.0, 47.75], [39.75, 47.85], [39.5, 47.75], [39.25, 47.85], [39.0, 47.75], [38.47, 47.97], [38.32, 48.32], [37.97, 48.47], [37.82, 48.82], [37.75, 48.85], [37.5, 48.75], [37.25, 48.85], [37.0, 48.75], [36.75, 48.85], [36.68, 48.82], [36.53, 48.47], [36.0, 48.25], [35.75, 48.35], [35.5, 48.25], [35.25, 48.35], [35.0, 48.25], [34.47, 48.47], [34.25, 49.0], [34.35, 49.25], [34.25, 49.5], [34.47, 50.03]], [[41.32, 50.68], [41.38, 50.8], [41.25, 50.85], [41.18, 50.82], [41.15, 50.75], [41.18, 50.68], [41.25, 50.65], [41.32, 50.68]]]]}, "2026-04-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[34.47, 50.03], [34.82, 50.18], [34.97, 50.53], [35.32, 50.68], [35.47, 51.03], [36.0, 51.25], [36.25, 51.15], [36.5, 51.25], [37.03, 51.03], [37.18, 50.68], [37.53, 50.53], [37.75, 50.0], [37.53, 49.47], [37.18, 49.32], [37.03, 48.97], [36.5, 48.75], [36.25, 48.85], [36.18, 48.82], [36.03, 48.47], [35.5, 48.25], [35.25, 48.35], [35.0, 48.25], [34.47, 48.47], [34.25, 49.0], [34.35, 49.25], [34.25, 49.5], [34.47, 50.03]]]]}, "2026-04-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[34.47, 50.03], [34.82, 50.18], [34.97, 50.53], [35.32, 50.68], [35.47, 51.03], [36.0, 51.25], [36.25, 51.15], [36.5, 51.25], [37.03, 51.03], [37.18, 50.68], [37.53, 50.53], [37.75, 50.0], [37.53, 49.47], [37.18, 49.32], [37.03, 48.97], [36.5, 48.75], [36.25, 48.85], [36.18, 48.82], [36.03, 48.47], [35.5, 48.25], [35.25, 48.35], [35.0, 48.25], [34.47, 48.47], [34.25, 49.0], [34.35, 49.25], [34.25, 49.5], [34.47, 50.03]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -8.325328109735494}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -6.0343805167789455}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [4.24644210319218, 4.052866251875798, 4.645697775231781, 5.294512685139978, 3.090760803222679]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [1.2807518005371321, 1.399439748128259, 2.2728744506836165, 4.432309722900413, 2.4043390909831146]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.9163505519647295, -6.210457177255471, -5.797824728097897, -5.394247848777108, -7.914038302798962]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-7.200203967601908, -7.646247036469845, -6.957864119139856, -5.788661161912614, -8.325328109735494]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4958243960326274, -1.5549075996936428, -1.4621805018305882, -1.4477952972848127, -2.1590759273618954]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.705468900644983, -2.086347894898058, -1.7514176146338607, -1.5031534243870377, -2.271827294761388]}}