{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:34:53.891200", "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": "2023-Apr-26_to_2023-Apr-29_26.5_48.0"}, "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": 2023040000843}, "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 26 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 29 2023"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 4}, "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": 258794.39124947938}, "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": ["Bulgaria", "Hungary", "Moldova", "North Macedonia", "Romania", "Serbia", "Slovakia", "Ukraine"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Mediterranean", "West&Central-Europe"]}, "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": 48.0}, "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": 26.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "26.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 19.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 27.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 41.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 50.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2023-04-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[19.47, 46.53], [19.88, 46.7], [19.75, 47.0], [19.97, 47.53], [20.5, 47.75], [20.75, 47.65], [20.82, 47.68], [20.96, 48.0], [20.75, 48.5], [20.97, 49.03], [21.32, 49.18], [21.47, 49.53], [22.0, 49.75], [22.25, 49.65], [22.5, 49.75], [23.03, 49.53], [23.18, 49.18], [23.25, 49.15], [23.5, 49.25], [23.75, 49.15], [23.82, 49.18], [23.85, 49.25], [23.75, 49.5], [23.85, 49.75], [23.75, 50.0], [23.97, 50.53], [24.5, 50.75], [24.75, 50.65], [25.0, 50.75], [25.25, 50.65], [25.5, 50.75], [25.75, 50.65], [26.0, 50.75], [26.53, 50.53], [26.75, 50.0], [26.65, 49.75], [26.68, 49.68], [26.75, 49.65], [27.0, 49.75], [27.53, 49.53], [27.75, 49.0], [27.65, 48.75], [27.75, 48.5], [27.65, 48.25], [27.68, 48.18], [28.03, 48.03], [28.25, 47.5], [28.03, 46.97], [27.5, 46.75], [27.25, 46.85], [27.0, 46.75], [26.47, 46.97], [26.32, 47.32], [26.25, 47.35], [26.0, 47.25], [25.5, 47.46], [25.13, 47.3], [25.18, 47.18], [25.53, 47.03], [25.75, 46.5], [25.65, 46.25], [25.75, 46.0], [25.53, 45.47], [25.0, 45.25], [24.75, 45.35], [24.68, 45.32], [24.53, 44.97], [24.0, 44.75], [23.75, 44.85], [23.5, 44.75], [23.0, 44.96], [22.68, 44.82], [22.53, 44.47], [22.18, 44.32], [22.15, 44.25], [22.18, 44.18], [22.25, 44.15], [22.5, 44.25], [23.03, 44.03], [23.18, 43.68], [23.53, 43.53], [23.75, 43.0], [23.65, 42.75], [23.75, 42.5], [23.65, 42.25], [23.75, 42.0], [23.53, 41.47], [23.18, 41.32], [23.03, 40.97], [22.5, 40.75], [21.97, 40.97], [21.82, 41.32], [21.75, 41.35], [21.5, 41.25], [20.97, 41.47], [20.82, 41.82], [20.47, 41.97], [20.25, 42.5], [20.35, 42.75], [20.25, 43.0], [20.35, 43.25], [20.32, 43.32], [19.97, 43.47], [19.82, 43.82], [19.47, 43.97], [19.25, 44.5], [19.46, 45.0], [19.25, 45.5], [19.35, 45.75], [19.25, 46.0], [19.47, 46.53]]]]}, "2023-04-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[19.47, 46.53], [19.88, 46.7], [19.75, 47.0], [19.97, 47.53], [20.5, 47.75], [20.75, 47.65], [20.82, 47.68], [20.96, 48.0], [20.75, 48.5], [20.97, 49.03], [21.32, 49.18], [21.47, 49.53], [22.0, 49.75], [22.25, 49.65], [22.5, 49.75], [23.03, 49.53], [23.18, 49.18], [23.25, 49.15], [23.5, 49.25], [23.75, 49.15], [23.82, 49.18], [23.85, 49.25], [23.75, 49.5], [23.85, 49.75], [23.75, 50.0], [23.97, 50.53], [24.5, 50.75], [24.75, 50.65], [25.0, 50.75], [25.25, 50.65], [25.5, 50.75], [25.75, 50.65], [26.0, 50.75], [26.53, 50.53], [26.75, 50.0], [26.65, 49.75], [26.68, 49.68], [26.75, 49.65], [27.0, 49.75], [27.53, 49.53], [27.75, 49.0], [27.65, 48.75], [27.75, 48.5], [27.65, 48.25], [27.68, 48.18], [28.03, 48.03], [28.25, 47.5], [28.15, 47.25], [28.25, 47.0], [28.03, 46.47], [27.5, 46.25], [26.97, 46.47], [26.82, 46.82], [26.47, 46.97], [26.32, 47.32], [26.25, 47.35], [26.0, 47.25], [25.5, 47.46], [25.13, 47.3], [25.18, 47.18], [25.53, 47.03], [25.75, 46.5], [25.65, 46.25], [25.75, 46.0], [25.53, 45.47], [25.13, 45.3], [25.25, 45.0], [25.03, 44.47], [24.68, 44.32], [24.65, 44.25], [24.75, 44.0], [24.53, 43.47], [24.0, 43.25], [23.75, 43.35], [23.63, 43.3], [23.75, 43.0], [23.65, 42.75], [23.75, 42.5], [23.65, 42.25], [23.75, 42.0], [23.53, 41.47], [23.18, 41.32], [23.03, 40.97], [22.5, 40.75], [21.97, 40.97], [21.82, 41.32], [21.75, 41.35], [21.5, 41.25], [20.97, 41.47], [20.82, 41.82], [20.47, 41.97], [20.25, 42.5], [20.35, 42.75], [20.25, 43.0], [20.35, 43.25], [20.32, 43.32], [19.97, 43.47], [19.82, 43.82], [19.47, 43.97], [19.25, 44.5], [19.46, 45.0], [19.25, 45.5], [19.35, 45.75], [19.25, 46.0], [19.47, 46.53]]]]}, "2023-04-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[19.47, 46.53], [19.88, 46.7], [19.75, 47.0], [19.97, 47.53], [20.5, 47.75], [20.75, 47.65], [20.82, 47.68], [20.96, 48.0], [20.75, 48.5], [20.97, 49.03], [21.32, 49.18], [21.47, 49.53], [22.0, 49.75], [22.25, 49.65], [22.5, 49.75], [23.03, 49.53], [23.18, 49.18], [23.25, 49.15], [23.5, 49.25], [23.75, 49.15], [23.82, 49.18], [23.85, 49.25], [23.75, 49.5], [23.85, 49.75], [23.75, 50.0], [23.97, 50.53], [24.5, 50.75], [24.75, 50.65], [25.0, 50.75], [25.25, 50.65], [25.5, 50.75], [25.75, 50.65], [26.0, 50.75], [26.53, 50.53], [26.75, 50.0], [26.65, 49.75], [26.68, 49.68], [26.75, 49.65], [27.0, 49.75], [27.53, 49.53], [27.75, 49.0], [27.65, 48.75], [27.75, 48.5], [27.65, 48.25], [27.68, 48.18], [28.03, 48.03], [28.25, 47.5], [28.15, 47.25], [28.25, 47.0], [28.03, 46.47], [27.5, 46.25], [26.97, 46.47], [26.82, 46.82], [26.47, 46.97], [26.32, 47.32], [26.25, 47.35], [26.0, 47.25], [25.5, 47.46], [25.13, 47.3], [25.18, 47.18], [25.53, 47.03], [25.75, 46.5], [25.65, 46.25], [25.75, 46.0], [25.53, 45.47], [25.13, 45.3], [25.25, 45.0], [25.03, 44.47], [24.68, 44.32], [24.65, 44.25], [24.75, 44.0], [24.53, 43.47], [24.0, 43.25], [23.75, 43.35], [23.63, 43.3], [23.75, 43.0], [23.65, 42.75], [23.75, 42.5], [23.65, 42.25], [23.75, 42.0], [23.53, 41.47], [23.18, 41.32], [23.03, 40.97], [22.5, 40.75], [21.97, 40.97], [21.82, 41.32], [21.75, 41.35], [21.5, 41.25], [20.97, 41.47], [20.82, 41.82], [20.47, 41.97], [20.25, 42.5], [20.35, 42.75], [20.25, 43.0], [20.35, 43.25], [20.32, 43.32], [19.97, 43.47], [19.82, 43.82], [19.47, 43.97], [19.25, 44.5], [19.46, 45.0], [19.25, 45.5], [19.35, 45.75], [19.25, 46.0], [19.47, 46.53]]]]}, "2023-04-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[22.75, 45.65], [23.0, 45.75], [23.25, 45.65], [23.5, 45.75], [23.75, 45.65], [24.0, 45.75], [24.25, 45.65], [24.5, 45.75], [25.03, 45.53], [25.25, 45.0], [25.03, 44.47], [24.68, 44.32], [24.65, 44.25], [24.75, 44.0], [24.53, 43.47], [24.0, 43.25], [23.75, 43.35], [23.5, 43.25], [22.97, 43.47], [22.82, 43.82], [22.75, 43.85], [22.5, 43.75], [22.25, 43.85], [22.0, 43.75], [21.47, 43.97], [21.25, 44.5], [21.47, 45.03], [21.82, 45.18], [21.97, 45.53], [22.5, 45.75], [22.75, 45.65]]], [[[26.5, 49.25], [26.75, 49.15], [27.0, 49.25], [27.53, 49.03], [27.75, 48.5], [27.65, 48.25], [27.68, 48.18], [28.03, 48.03], [28.25, 47.5], [28.15, 47.25], [28.25, 47.0], [28.03, 46.47], [27.5, 46.25], [26.97, 46.47], [26.82, 46.82], [26.47, 46.97], [26.32, 47.32], [25.97, 47.47], [25.75, 48.0], [25.85, 48.25], [25.75, 48.5], [25.97, 49.03], [26.5, 49.25]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -8.505156632378714}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.462416590073234}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [7.540307658250583, 6.9202539183808085, 8.137611131826816, 9.64521391273837]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [0.49759442480745975, -1.4340456907649468, 1.841639011082691, 6.351281697970649]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.1812383984675945, -6.157768447638061, -5.172080131406929, -4.481384033583191]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.286977495381791, -8.505156632378714, -5.966944050921995, -5.053580412109795]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5963280582431845, -1.9197167540959896, -1.6077056221147688, -1.4426407227638502]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.8985231036026133, -2.364735536347842, -1.9657057443310826, -1.5148024333912113]}}