{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:57:57.559857", "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-Dec-14_to_2025-Dec-16_277.0_39.5"}, "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": 2025120000498}, "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": "December 14 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 16 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": 124454.2697723915}, "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": 39.5}, "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": 277.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "277.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 276.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 282.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 38.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 42.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-12-14T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-83.65, 40.25], [-83.75, 40.5], [-83.53, 41.03], [-83.0, 41.25], [-82.75, 41.15], [-82.68, 41.18], [-82.53, 41.53], [-82.18, 41.68], [-82.03, 42.03], [-81.5, 42.25], [-81.25, 42.15], [-81.18, 42.18], [-81.03, 42.53], [-80.5, 42.75], [-80.25, 42.65], [-80.0, 42.75], [-79.75, 42.65], [-79.5, 42.75], [-79.25, 42.65], [-79.0, 42.75], [-78.75, 42.65], [-78.5, 42.75], [-78.25, 42.65], [-78.0, 42.75], [-77.47, 42.53], [-77.25, 42.0], [-77.35, 41.75], [-77.25, 41.5], [-77.35, 41.25], [-77.25, 41.0], [-77.47, 40.47], [-77.82, 40.32], [-77.97, 39.97], [-78.5, 39.75], [-78.75, 39.85], [-78.82, 39.82], [-78.97, 39.47], [-79.32, 39.32], [-79.47, 38.97], [-79.82, 38.82], [-79.97, 38.47], [-80.5, 38.25], [-80.75, 38.35], [-81.0, 38.25], [-81.25, 38.35], [-81.5, 38.25], [-81.75, 38.35], [-82.0, 38.25], [-82.25, 38.35], [-82.5, 38.25], [-83.03, 38.47], [-83.18, 38.82], [-83.53, 38.97], [-83.75, 39.5], [-83.65, 39.75], [-83.75, 40.0], [-83.65, 40.25]]]]}, "2025-12-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-83.65, 40.25], [-83.75, 40.5], [-83.53, 41.03], [-83.0, 41.25], [-82.75, 41.15], [-82.68, 41.18], [-82.53, 41.53], [-82.18, 41.68], [-82.03, 42.03], [-81.5, 42.25], [-81.25, 42.15], [-81.18, 42.18], [-81.03, 42.53], [-80.5, 42.75], [-80.25, 42.65], [-80.0, 42.75], [-79.75, 42.65], [-79.5, 42.75], [-79.25, 42.65], [-79.0, 42.75], [-78.75, 42.65], [-78.5, 42.75], [-78.25, 42.65], [-78.0, 42.75], [-77.47, 42.53], [-77.25, 42.0], [-77.35, 41.75], [-77.25, 41.5], [-77.35, 41.25], [-77.25, 41.0], [-77.47, 40.47], [-77.82, 40.32], [-77.97, 39.97], [-78.5, 39.75], [-78.75, 39.85], [-78.82, 39.82], [-78.97, 39.47], [-79.32, 39.32], [-79.47, 38.97], [-79.82, 38.82], [-79.97, 38.47], [-80.5, 38.25], [-80.75, 38.35], [-81.0, 38.25], [-81.25, 38.35], [-81.5, 38.25], [-81.75, 38.35], [-82.0, 38.25], [-82.25, 38.35], [-82.5, 38.25], [-83.03, 38.47], [-83.18, 38.82], [-83.53, 38.97], [-83.75, 39.5], [-83.65, 39.75], [-83.75, 40.0], [-83.65, 40.25]]]]}, "2025-12-16T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-83.65, 40.25], [-83.75, 40.5], [-83.53, 41.03], [-83.0, 41.25], [-82.75, 41.15], [-82.68, 41.18], [-82.53, 41.53], [-82.18, 41.68], [-82.03, 42.03], [-81.5, 42.25], [-81.25, 42.15], [-81.18, 42.18], [-81.03, 42.53], [-80.5, 42.75], [-80.25, 42.65], [-80.0, 42.75], [-79.75, 42.65], [-79.5, 42.75], [-79.25, 42.65], [-79.0, 42.75], [-78.75, 42.65], [-78.5, 42.75], [-78.25, 42.65], [-78.0, 42.75], [-77.47, 42.53], [-77.25, 42.0], [-77.35, 41.75], [-77.25, 41.5], [-77.35, 41.25], [-77.25, 41.0], [-77.47, 40.47], [-77.82, 40.32], [-77.97, 39.97], [-78.5, 39.75], [-78.75, 39.85], [-78.82, 39.82], [-78.97, 39.47], [-79.32, 39.32], [-79.47, 38.97], [-79.82, 38.82], [-79.97, 38.47], [-80.5, 38.25], [-80.75, 38.35], [-81.0, 38.25], [-81.25, 38.35], [-81.5, 38.25], [-81.75, 38.35], [-82.0, 38.25], [-82.25, 38.35], [-82.5, 38.25], [-83.03, 38.47], [-83.18, 38.82], [-83.53, 38.97], [-83.75, 39.5], [-83.65, 39.75], [-83.75, 40.0], [-83.65, 40.25]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -16.340366791154622}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -9.838514550794608}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-9.022185161278685, -11.791952094791782, -6.959282482795004]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-11.286320749918616, -14.574617767333962, -10.752817535400368]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-9.54046159687112, -12.365718418317378, -7.609363637195317]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-13.05748079615438, -16.340366791154622, -9.290794464417615]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.9437779526037187, -2.4988033663774414, -1.5217431572790074]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.5437545976806533, -3.2144229429937794, -1.9570218215645045]}}