{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:55:28.211701", "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-May-19_to_2025-May-26_272.5_42.0"}, "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": 2025050000396}, "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": "May 19 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 26 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 8}, "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": 64661.746621050275}, "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": ["United States"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["C.North-America", "E.North-America"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["North America"]}, "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": 42.0}, "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": 272.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "272.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 269.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 272.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 41.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 45.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-05-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-91.25, 45.0], [-91.03, 45.53], [-90.5, 45.75], [-90.25, 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[-87.25, 44.5], [-87.35, 44.25], [-87.25, 44.0], [-87.35, 43.75], [-87.25, 43.5], [-87.35, 43.25], [-87.25, 43.0], [-87.35, 42.75], [-87.25, 42.5], [-87.47, 41.97], [-88.0, 41.75], [-88.25, 41.85], [-88.5, 41.75], [-88.75, 41.85], [-89.0, 41.75], [-89.53, 41.97], [-89.68, 42.32], [-89.75, 42.35], [-90.0, 42.25], [-90.53, 42.47], [-90.75, 43.0], [-90.54, 43.5], [-90.75, 44.0], [-90.65, 44.25], [-90.68, 44.32], [-91.03, 44.47], [-91.25, 45.0]]]]}, "2025-05-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-91.25, 45.0], [-91.03, 45.53], [-90.5, 45.75], [-90.25, 45.65], [-90.0, 45.75], [-89.75, 45.65], [-89.5, 45.75], [-89.25, 45.65], [-89.0, 45.75], [-88.75, 45.65], [-88.5, 45.75], [-88.25, 45.65], [-88.0, 45.75], [-87.47, 45.53], [-87.25, 45.0], [-87.35, 44.75], [-87.25, 44.5], [-87.35, 44.25], [-87.25, 44.0], [-87.35, 43.75], [-87.25, 43.5], [-87.35, 43.25], [-87.25, 43.0], [-87.35, 42.75], [-87.32, 42.68], [-86.97, 42.53], [-86.75, 42.0], [-86.97, 41.47], [-87.5, 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"description": "Mean t2m anomaly over entire duration", "value": -6.513113733503108}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [7.536727963961084, 7.8262787591843335, 8.134008903064966, 9.942380523681663, 8.315634663899743, 9.102974192301474, 9.243047332763695, 9.0745674133301]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [5.9912645975749115, 6.814185078938806, 7.146749114990257, 8.123909250895224, 8.315634663899743, 9.102974192301474, 9.243047332763695, 9.0745674133301]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-6.609788593462641, -6.678653912728121, -6.6279835438978205, -5.607950391147234, -5.869446805386644, -5.41103296763464, -5.570483412563874, -5.962902608579611]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": 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