{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:59:32.371356", "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-May-01_to_2026-May-03_278.0_40.0"}, "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": 2026050000066}, "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 01 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 03 2026"}, "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": 213097.28567711523}, "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": ["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": 40.0}, "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": 278.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "278.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 274.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 283.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 37.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 43.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-05-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-84.68, 39.68], [-84.53, 40.03], [-84.18, 40.18], [-84.15, 40.25], [-84.18, 40.32], [-84.25, 40.35], [-84.5, 40.25], [-85.03, 40.47], [-85.25, 41.0], [-85.03, 41.53], [-84.5, 41.75], [-84.25, 41.65], [-84.0, 41.75], [-83.75, 41.65], [-83.5, 41.75], [-83.25, 41.65], [-83.0, 41.75], [-82.75, 41.65], [-82.5, 41.75], [-82.25, 41.65], [-82.0, 41.75], [-81.75, 41.65], [-81.5, 41.75], [-81.25, 41.65], [-81.18, 41.68], [-81.03, 42.03], [-80.5, 42.25], [-80.25, 42.15], [-80.0, 42.25], [-79.75, 42.15], [-79.68, 42.18], [-79.53, 42.53], [-79.18, 42.68], [-79.15, 42.75], [-79.25, 43.0], [-79.03, 43.53], [-78.5, 43.75], [-77.97, 43.53], [-77.75, 43.0], [-77.85, 42.75], [-77.82, 42.68], [-77.75, 42.65], [-77.5, 42.75], [-76.97, 42.53], [-76.82, 42.18], [-76.47, 42.03], [-76.25, 41.5], [-76.47, 40.97], [-76.82, 40.82], [-76.97, 40.47], [-77.32, 40.32], [-77.47, 39.97], [-78.0, 39.75], [-78.25, 39.85], [-78.37, 39.8], [-78.25, 39.5], [-78.46, 39.0], [-78.25, 38.5], [-78.47, 37.97], [-78.82, 37.82], [-78.97, 37.47], [-79.5, 37.25], [-79.75, 37.35], [-80.0, 37.25], [-80.25, 37.35], [-80.5, 37.25], [-81.0, 37.46], [-81.5, 37.25], [-81.75, 37.35], [-82.0, 37.25], [-82.25, 37.35], [-82.5, 37.25], [-82.75, 37.35], [-83.0, 37.25], [-83.53, 37.47], [-83.68, 37.82], [-83.75, 37.85], [-84.0, 37.75], [-84.25, 37.85], [-84.5, 37.75], [-84.75, 37.85], [-85.0, 37.75], [-85.53, 37.97], [-85.75, 38.5], [-85.53, 39.03], [-85.18, 39.18], [-85.03, 39.53], [-84.68, 39.68]]]]}, "2026-05-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-84.68, 39.68], [-84.53, 40.03], [-84.18, 40.18], [-84.15, 40.25], [-84.18, 40.32], [-84.25, 40.35], [-84.5, 40.25], [-85.03, 40.47], [-85.25, 41.0], [-85.03, 41.53], [-84.5, 41.75], [-84.25, 41.65], [-84.0, 41.75], [-83.75, 41.65], [-83.5, 41.75], [-83.25, 41.65], [-83.0, 41.75], [-82.75, 41.65], [-82.5, 41.75], [-82.25, 41.65], [-82.0, 41.75], [-81.75, 41.65], [-81.5, 41.75], [-81.25, 41.65], [-81.18, 41.68], [-81.03, 42.03], [-80.5, 42.25], [-80.25, 42.15], [-80.0, 42.25], [-79.75, 42.15], [-79.68, 42.18], [-79.53, 42.53], [-79.18, 42.68], [-79.15, 42.75], [-79.25, 43.0], [-79.03, 43.53], [-78.5, 43.75], [-77.97, 43.53], [-77.75, 43.0], [-77.85, 42.75], [-77.82, 42.68], [-77.75, 42.65], [-77.5, 42.75], [-76.97, 42.53], [-76.82, 42.18], [-76.47, 42.03], [-76.25, 41.5], [-76.47, 40.97], [-76.82, 40.82], [-76.97, 40.47], [-77.32, 40.32], [-77.47, 39.97], [-78.0, 39.75], [-78.25, 39.85], [-78.37, 39.8], [-78.25, 39.5], [-78.46, 39.0], [-78.25, 38.5], [-78.47, 37.97], [-78.82, 37.82], [-78.97, 37.47], [-79.5, 37.25], [-79.75, 37.35], [-80.0, 37.25], [-80.25, 37.35], [-80.5, 37.25], [-81.0, 37.46], [-81.5, 37.25], [-81.75, 37.35], [-82.0, 37.25], [-82.25, 37.35], [-82.5, 37.25], [-82.75, 37.35], [-83.0, 37.25], [-83.53, 37.47], [-83.68, 37.82], [-83.75, 37.85], [-84.0, 37.75], [-84.25, 37.85], [-84.5, 37.75], [-84.75, 37.85], [-85.0, 37.75], [-85.53, 37.97], [-85.75, 38.5], [-85.53, 39.03], [-85.18, 39.18], [-85.03, 39.53], [-84.68, 39.68]]]]}, "2026-05-03T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-84.68, 39.68], [-84.53, 40.03], [-84.18, 40.18], [-84.15, 40.25], [-84.18, 40.32], [-84.25, 40.35], [-84.5, 40.25], [-85.03, 40.47], [-85.25, 41.0], [-85.03, 41.53], [-84.5, 41.75], [-84.25, 41.65], [-84.0, 41.75], [-83.75, 41.65], [-83.5, 41.75], [-83.25, 41.65], [-83.0, 41.75], [-82.75, 41.65], [-82.5, 41.75], [-82.25, 41.65], [-82.0, 41.75], [-81.75, 41.65], [-81.5, 41.75], [-81.25, 41.65], [-81.18, 41.68], [-81.03, 42.03], [-80.5, 42.25], [-80.25, 42.15], [-80.0, 42.25], [-79.75, 42.15], [-79.68, 42.18], [-79.53, 42.53], [-79.18, 42.68], [-79.15, 42.75], [-79.25, 43.0], [-79.03, 43.53], [-78.5, 43.75], [-77.97, 43.53], [-77.75, 43.0], [-77.85, 42.75], [-77.82, 42.68], [-77.75, 42.65], [-77.5, 42.75], [-76.97, 42.53], [-76.82, 42.18], [-76.47, 42.03], [-76.25, 41.5], [-76.47, 40.97], [-76.82, 40.82], [-76.97, 40.47], [-77.32, 40.32], [-77.47, 39.97], [-78.0, 39.75], [-78.25, 39.85], [-78.37, 39.8], [-78.25, 39.5], [-78.46, 39.0], [-78.25, 38.5], 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t2m", "description": "The daily evolution of maximum t2m.", "value": [3.456563568115257, 2.2610399881999115, 3.137801106770837]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-6.127904074080418, -7.7832209122366525, -6.8982253327397]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-7.580562347156217, -9.207363827188544, -8.389583217868221]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.544301366085478, -1.9623280692769776, -1.7339028181157181]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.85402605384985, -2.319793924747255, -2.074455143811598]}}