{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:57:43.965100", "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-Nov-30_to_2025-Dec-02_263.0_41.0"}, "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": 2025110000779}, "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": "November 30 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 02 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": 71975.64276121798}, "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"]}, "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": 41.0}, "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": 263.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "263.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 262.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 266.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 40.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 43.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-11-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-98.15, 41.25], [-98.25, 41.5], [-98.03, 42.03], [-97.5, 42.25], [-97.25, 42.15], [-97.18, 42.18], [-97.15, 42.25], [-97.18, 42.32], [-97.53, 42.47], [-97.68, 42.82], [-98.03, 42.97], [-98.25, 43.5], [-98.03, 44.03], [-97.5, 44.25], [-96.97, 44.03], [-96.82, 43.68], [-96.47, 43.53], [-96.32, 43.18], [-95.97, 43.03], [-95.75, 42.5], [-95.85, 42.25], [-95.82, 42.18], [-95.75, 42.15], [-95.68, 42.18], [-95.53, 42.53], [-95.0, 42.75], [-94.75, 42.65], [-94.5, 42.75], [-93.97, 42.53], [-93.82, 42.18], [-93.75, 42.15], [-93.5, 42.25], [-92.97, 42.03], [-92.75, 41.5], [-92.96, 41.0], [-92.75, 40.5], [-92.97, 39.97], [-93.5, 39.75], [-93.75, 39.85], [-94.0, 39.75], [-94.25, 39.85], [-94.5, 39.75], [-94.75, 39.85], [-95.0, 39.75], [-95.25, 39.85], [-95.5, 39.75], [-96.0, 39.96], [-96.5, 39.75], [-96.75, 39.85], [-97.0, 39.75], [-97.25, 39.85], [-97.5, 39.75], [-98.03, 39.97], [-98.25, 40.5], [-98.15, 40.75], [-98.25, 41.0], [-98.15, 41.25]]]]}, "2025-12-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-98.15, 41.25], [-98.25, 41.5], [-98.03, 42.03], [-97.5, 42.25], [-97.25, 42.15], [-97.18, 42.18], [-97.15, 42.25], [-97.18, 42.32], [-97.53, 42.47], [-97.68, 42.82], [-98.03, 42.97], [-98.25, 43.5], [-98.03, 44.03], [-97.5, 44.25], [-96.97, 44.03], [-96.82, 43.68], [-96.47, 43.53], [-96.32, 43.18], [-95.97, 43.03], [-95.75, 42.5], [-95.85, 42.25], [-95.82, 42.18], [-95.75, 42.15], [-95.68, 42.18], [-95.53, 42.53], [-95.0, 42.75], [-94.75, 42.65], [-94.5, 42.75], [-93.97, 42.53], [-93.82, 42.18], [-93.75, 42.15], [-93.5, 42.25], [-92.97, 42.03], [-92.75, 41.5], [-92.96, 41.0], [-92.75, 40.5], [-92.97, 39.97], [-93.5, 39.75], [-93.75, 39.85], [-94.0, 39.75], [-94.25, 39.85], [-94.5, 39.75], [-94.75, 39.85], [-95.0, 39.75], [-95.25, 39.85], [-95.5, 39.75], [-96.0, 39.96], [-96.5, 39.75], [-96.75, 39.85], [-97.0, 39.75], [-97.25, 39.85], [-97.5, 39.75], [-98.03, 39.97], [-98.25, 40.5], [-98.15, 40.75], [-98.25, 41.0], [-98.15, 41.25]]]]}, "2025-12-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-98.15, 41.25], [-98.25, 41.5], [-98.03, 42.03], [-97.5, 42.25], [-97.25, 42.15], [-97.18, 42.18], [-97.15, 42.25], [-97.18, 42.32], [-97.53, 42.47], [-97.68, 42.82], [-98.03, 42.97], [-98.25, 43.5], [-98.03, 44.03], [-97.5, 44.25], [-96.97, 44.03], [-96.82, 43.68], [-96.47, 43.53], [-96.32, 43.18], [-95.97, 43.03], [-95.75, 42.5], [-95.85, 42.25], [-95.82, 42.18], [-95.75, 42.15], [-95.68, 42.18], [-95.53, 42.53], [-95.0, 42.75], [-94.75, 42.65], [-94.5, 42.75], [-93.97, 42.53], [-93.82, 42.18], [-93.75, 42.15], [-93.5, 42.25], [-92.97, 42.03], [-92.75, 41.5], [-92.96, 41.0], [-92.75, 40.5], [-92.97, 39.97], [-93.5, 39.75], [-93.75, 39.85], [-94.0, 39.75], [-94.25, 39.85], [-94.5, 39.75], [-94.75, 39.85], [-95.0, 39.75], [-95.25, 39.85], [-95.5, 39.75], [-96.0, 39.96], [-96.5, 39.75], [-96.75, 39.85], [-97.0, 39.75], [-97.25, 39.85], [-97.5, 39.75], [-98.03, 39.97], [-98.25, 40.5], [-98.15, 40.75], [-98.25, 41.0], [-98.15, 41.25]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -10.026056524918715}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -8.146893280049804}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-8.03359274915465, -8.049746310326327, -8.029386655745952]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-9.983396911621071, -10.342255655924475, -11.120784505208292]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-8.477733994960875, -8.156718276009773, -7.80622756917877]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-10.026056524918715, -9.490770253945243, -8.743066860420356]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.6176035154621766, -1.5625794436364329, -1.4783880781302041]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.0066501623130732, -1.8899100219332736, -1.6949638048073938]}}