{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:05:46.696075", "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-Jun-17_to_2025-Jun-24_45.5_-77.0"}, "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": 2025060000585}, "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": "June 17 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "June 24 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": 79064.56044797781}, "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": ["Antarctica"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Antarctica"]}, "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": -77.0}, "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": 45.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "45.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 40.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 51.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -79.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -75.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[47.5, -75.25], [47.75, -75.35], [48.0, -75.25], [48.25, -75.35], [48.5, -75.25], [48.75, -75.35], [49.0, -75.25], [49.53, -75.47], [49.68, -75.82], [49.75, -75.85], [50.0, -75.75], [50.53, -75.97], [50.75, -76.5], [50.65, -76.75], [50.75, -77.0], [50.65, -77.25], [50.75, -77.5], [50.63, -77.8], [50.75, -77.85], [51.0, -77.75], [51.53, -77.97], [51.75, -78.5], [51.65, -78.75], [51.75, -79.0], [51.65, -79.25], [51.75, -79.5], [51.53, -80.03], [51.0, -80.25], [50.75, -80.15], [50.5, -80.25], [50.25, -80.15], [50.0, -80.25], [49.75, -80.15], [49.5, -80.25], [49.25, -80.15], [49.0, -80.25], [48.47, -80.03], [48.32, -79.68], [48.25, -79.65], [48.0, -79.75], [47.75, -79.65], [47.5, -79.75], [47.25, -79.65], [47.0, -79.75], [46.75, -79.65], [46.5, -79.75], [45.97, -79.53], [45.82, -79.18], [45.75, -79.15], [45.5, -79.25], [44.97, -79.03], [44.82, -78.68], [44.47, -78.53], [44.25, -78.0], [44.35, -77.75], [44.32, -77.68], [44.25, -77.65], [44.0, -77.75], [43.47, -77.53], [43.32, -77.18], [43.25, -77.15], [43.0, -77.25], [42.47, -77.03], [42.32, -76.68], [42.25, -76.65], [42.0, -76.75], [41.75, -76.65], [41.5, -76.75], [41.25, -76.65], [41.0, -76.75], [40.47, -76.53], [40.32, -76.18], [40.25, -76.15], [40.0, -76.25], [39.47, -76.03], [39.25, -75.5], [39.47, -74.97], [40.0, -74.75], [40.25, -74.85], [40.5, -74.75], [40.75, -74.85], [41.0, -74.75], [41.25, -74.85], [41.32, -74.82], [41.47, -74.47], [42.0, -74.25], [42.25, -74.35], [42.5, -74.25], [42.75, -74.35], [43.0, -74.25], [43.25, -74.35], [43.5, -74.25], [43.75, -74.35], [44.0, -74.25], [44.25, -74.35], [44.5, -74.25], [44.75, -74.35], [45.0, -74.25], [45.25, -74.35], [45.5, -74.25], [46.03, -74.47], [46.18, -74.82], [46.25, -74.85], [46.5, -74.75], [47.03, -74.97], [47.18, -75.32], [47.25, -75.35], [47.5, -75.25]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Antarctica"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-06-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[44.97, -76.47], [45.5, -76.25], [46.03, -76.47], [46.25, -77.0], [46.03, -77.53], [45.5, -77.75], [44.97, -77.53], [44.75, -77.0], [44.97, -76.47]]]]}, "2025-06-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[45.5, -77.75], [44.97, -77.53], [44.75, -77.0], [44.97, -76.47], [45.5, -76.25], [45.75, -76.35], [46.0, -76.25], [46.25, -76.35], [46.5, -76.25], [46.75, -76.35], [46.82, -76.32], [46.97, -75.97], [47.5, -75.75], [48.03, -75.97], [48.18, -76.32], [48.53, -76.47], [48.75, -77.0], [48.53, -77.53], [48.0, -77.75], [47.75, -77.65], [47.5, -77.75], [47.25, -77.65], [47.0, -77.75], [46.75, -77.65], [46.5, -77.75], [46.25, -77.65], [46.0, -77.75], [45.75, -77.65], [45.5, -77.75]]]]}, "2025-06-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[45.5, -77.75], [44.97, -77.53], [44.75, -77.0], [44.97, -76.47], [45.5, -76.25], [45.75, -76.35], [46.0, -76.25], [46.25, -76.35], [46.5, -76.25], [46.75, -76.35], [46.82, -76.32], [46.97, -75.97], [47.5, -75.75], [48.03, -75.97], [48.18, -76.32], [48.53, -76.47], [48.68, -76.82], [48.75, -76.85], [49.0, -76.75], [49.53, -76.97], [49.75, -77.5], [49.63, -77.8], [49.75, -77.85], [50.0, -77.75], [50.25, -77.85], [50.5, -77.75], [50.75, -77.85], [51.0, -77.75], [51.53, -77.97], [51.75, -78.5], [51.53, -79.03], [51.0, -79.25], [50.75, -79.15], [50.5, -79.25], [50.25, -79.15], [50.0, -79.25], [49.75, -79.15], [49.5, -79.25], [49.25, -79.15], [49.0, -79.25], [48.75, -79.15], [48.5, -79.25], [47.97, -79.03], [47.75, -78.5], [47.88, -78.2], [47.47, -78.03], [47.32, -77.68], [47.25, -77.65], [47.0, -77.75], [46.75, -77.65], [46.5, -77.75], [46.25, -77.65], [46.0, -77.75], [45.75, -77.65], [45.5, -77.75]]]]}, "2025-06-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[43.97, -77.03], [43.75, -76.5], [43.97, -75.97], [44.5, -75.75], [44.75, -75.85], [45.0, -75.75], [45.25, -75.85], [45.5, -75.75], [45.75, -75.85], [46.0, -75.75], [46.25, -75.85], [46.32, -75.82], [46.47, -75.47], [47.0, -75.25], [47.53, -75.47], [47.68, -75.82], [48.03, -75.97], [48.18, -76.32], [48.53, -76.47], [48.68, -76.82], [48.75, -76.85], [49.0, -76.75], [49.53, -76.97], [49.75, -77.5], [49.63, -77.8], [49.75, -77.85], [50.0, -77.75], [50.25, -77.85], [50.5, -77.75], [50.75, -77.85], [51.0, -77.75], [51.53, -77.97], [51.75, -78.5], [51.65, -78.75], [51.75, -79.0], [51.65, -79.25], [51.75, -79.5], [51.53, -80.03], [51.0, -80.25], [50.75, -80.15], [50.5, -80.25], [50.25, -80.15], [50.0, -80.25], [49.75, -80.15], [49.5, -80.25], [49.25, -80.15], [49.0, -80.25], [48.47, -80.03], [48.32, -79.68], [48.25, -79.65], [48.0, -79.75], [47.75, -79.65], [47.5, -79.75], [47.25, -79.65], [47.0, -79.75], [46.75, -79.65], [46.5, -79.75], [45.97, -79.53], [45.82, -79.18], [45.75, -79.15], [45.5, -79.25], [44.97, -79.03], [44.75, -78.5], [44.97, -77.97], [45.5, -77.75], [45.25, -77.65], [45.0, -77.75], [44.47, -77.53], [44.32, -77.18], [43.97, -77.03]], [[45.75, -77.85], [46.0, -77.75], [45.75, -77.65], [45.5, -77.75], [45.75, -77.85]], [[46.25, -77.85], [46.5, -77.75], [46.25, -77.65], [46.0, -77.75], [46.25, -77.85]], [[46.75, -77.85], [47.0, -77.75], [46.75, -77.65], [46.5, -77.75], [46.75, -77.85]], [[47.25, -77.85], [47.38, -77.8], [47.32, -77.68], [47.25, -77.65], [47.0, -77.75], [47.25, -77.85]]]]}, "2025-06-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[40.0, -76.25], [39.47, -76.03], [39.25, -75.5], [39.47, -74.97], [40.0, -74.75], [40.25, -74.85], [40.5, -74.75], [40.75, -74.85], [41.0, -74.75], [41.25, -74.85], [41.32, -74.82], [41.47, -74.47], [42.0, -74.25], [42.25, -74.35], [42.5, -74.25], [42.75, -74.35], [43.0, -74.25], [43.25, -74.35], [43.5, -74.25], [43.75, -74.35], [44.0, -74.25], [44.25, -74.35], [44.5, -74.25], [44.75, -74.35], [45.0, -74.25], [45.25, -74.35], [45.5, -74.25], [46.03, -74.47], [46.18, -74.82], [46.25, -74.85], [46.5, -74.75], [47.03, -74.97], [47.18, -75.32], [47.53, -75.47], [47.68, -75.82], [48.03, -75.97], [48.25, -76.5], [48.13, -76.8], [48.25, -76.85], [48.5, -76.75], [48.75, -76.85], [49.0, -76.75], [49.25, -76.85], [49.5, -76.75], [50.03, -76.97], [50.25, -77.5], [50.13, -77.8], [50.25, -77.85], [50.5, -77.75], [50.75, -77.85], [51.0, -77.75], [51.53, -77.97], [51.75, -78.5], [51.65, -78.75], [51.75, -79.0], [51.65, -79.25], [51.75, -79.5], [51.53, -80.03], [51.0, -80.25], [50.75, -80.15], [50.5, -80.25], [50.25, -80.15], [50.0, -80.25], [49.75, -80.15], [49.5, -80.25], [49.25, -80.15], [49.0, -80.25], [48.47, -80.03], [48.32, -79.68], [48.25, -79.65], [48.0, -79.75], [47.75, -79.65], [47.5, -79.75], [47.25, -79.65], [47.0, -79.75], [46.75, -79.65], [46.5, -79.75], [45.97, -79.53], [45.82, -79.18], [45.75, -79.15], [45.5, -79.25], [44.97, -79.03], [44.82, -78.68], [44.47, -78.53], [44.25, -78.0], [44.35, -77.75], [44.32, -77.68], [44.25, -77.65], [44.0, -77.75], [43.47, -77.53], [43.32, -77.18], [43.25, -77.15], [43.0, -77.25], [42.47, -77.03], [42.32, -76.68], [42.25, -76.65], [42.0, -76.75], [41.75, -76.65], [41.5, -76.75], [41.25, -76.65], [41.0, -76.75], [40.47, -76.53], [40.32, -76.18], [40.25, -76.15], [40.0, -76.25]]]]}, "2025-06-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[40.0, -76.25], [39.47, -76.03], [39.25, -75.5], [39.47, -74.97], [40.0, -74.75], [40.25, -74.85], [40.5, -74.75], [40.75, -74.85], [41.0, -74.75], [41.25, -74.85], [41.32, -74.82], [41.47, -74.47], [42.0, -74.25], [42.25, -74.35], [42.5, -74.25], [42.75, -74.35], [43.0, -74.25], [43.25, -74.35], [43.5, -74.25], [43.75, -74.35], [44.0, -74.25], [44.25, -74.35], [44.5, -74.25], [44.75, -74.35], [45.0, -74.25], [45.25, -74.35], [45.5, -74.25], [46.03, -74.47], [46.18, -74.82], [46.25, -74.85], [46.5, -74.75], [47.03, -74.97], [47.18, -75.32], [47.25, -75.35], [47.5, -75.25], [47.75, -75.35], [48.0, -75.25], [48.25, -75.35], [48.5, -75.25], [48.75, -75.35], [49.0, -75.25], [49.53, -75.47], [49.68, -75.82], [49.75, -75.85], [50.0, -75.75], [50.53, -75.97], [50.75, -76.5], [50.65, -76.75], [50.75, -77.0], [50.65, -77.25], [50.75, -77.5], [50.63, -77.8], [50.75, -77.85], [51.0, -77.75], [51.53, -77.97], [51.75, -78.5], [51.65, -78.75], [51.75, -79.0], [51.65, -79.25], [51.75, -79.5], [51.53, -80.03], [51.0, -80.25], [50.75, -80.15], [50.5, -80.25], [50.25, -80.15], [50.0, -80.25], [49.75, -80.15], [49.5, -80.25], [49.25, -80.15], [49.0, -80.25], [48.47, -80.03], [48.32, -79.68], [48.25, -79.65], [48.0, -79.75], [47.75, -79.65], [47.5, -79.75], [47.25, -79.65], [47.0, -79.75], [46.75, -79.65], [46.5, -79.75], [45.97, -79.53], [45.82, -79.18], [45.75, -79.15], [45.5, -79.25], [44.97, -79.03], [44.82, -78.68], [44.47, -78.53], [44.25, -78.0], [44.35, -77.75], [44.32, -77.68], [44.25, -77.65], [44.0, -77.75], [43.47, -77.53], [43.32, -77.18], [43.25, -77.15], [43.0, -77.25], [42.47, -77.03], [42.32, -76.68], [42.25, -76.65], [42.0, -76.75], [41.75, -76.65], [41.5, -76.75], [41.25, -76.65], [41.0, -76.75], [40.47, -76.53], [40.32, -76.18], [40.25, -76.15], [40.0, -76.25]]]]}, "2025-06-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[40.0, -76.25], [39.47, -76.03], [39.25, -75.5], [39.47, -74.97], [40.0, -74.75], [40.25, -74.85], [40.5, -74.75], [40.75, -74.85], [41.0, -74.75], [41.25, -74.85], [41.32, -74.82], [41.47, -74.47], [42.0, -74.25], [42.25, -74.35], [42.5, -74.25], [42.75, -74.35], [43.0, -74.25], [43.25, -74.35], [43.5, -74.25], [43.75, -74.35], [44.0, -74.25], [44.25, -74.35], [44.5, -74.25], [44.75, -74.35], [45.0, -74.25], [45.25, -74.35], [45.5, -74.25], [46.03, -74.47], [46.18, -74.82], [46.25, -74.85], [46.5, -74.75], [47.03, -74.97], [47.18, -75.32], [47.25, -75.35], [47.5, -75.25], [47.75, -75.35], [48.0, -75.25], [48.25, -75.35], [48.5, -75.25], [48.75, -75.35], [49.0, -75.25], [49.53, -75.47], [49.68, -75.82], [49.75, -75.85], [50.0, -75.75], [50.53, -75.97], [50.75, -76.5], [50.65, -76.75], [50.75, -77.0], [50.65, -77.25], [50.75, -77.5], [50.53, -78.03], [50.0, -78.25], [49.75, -78.15], [49.68, -78.18], [49.53, -78.53], [49.0, -78.75], [48.75, -78.65], [48.68, -78.68], [48.53, -79.03], [48.18, -79.18], [48.03, -79.53], [47.5, -79.75], [47.25, -79.65], [47.0, -79.75], [46.75, -79.65], [46.5, -79.75], [45.97, -79.53], [45.82, -79.18], [45.75, -79.15], [45.5, -79.25], [44.97, -79.03], [44.82, -78.68], [44.47, -78.53], [44.25, -78.0], [44.35, -77.75], [44.32, -77.68], [44.25, -77.65], [44.0, -77.75], [43.47, -77.53], [43.32, -77.18], [43.25, -77.15], [43.0, -77.25], [42.47, -77.03], [42.32, -76.68], [42.25, -76.65], [42.0, -76.75], [41.75, -76.65], [41.5, -76.75], [41.25, -76.65], [41.0, -76.75], [40.47, -76.53], [40.32, -76.18], [40.25, -76.15], [40.0, -76.25]]]]}, "2025-06-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[44.25, -76.5], [44.47, -75.97], [44.82, -75.82], [44.97, -75.47], [45.5, -75.25], [45.75, -75.35], [46.0, -75.25], [46.25, -75.35], [46.5, -75.25], [46.75, -75.35], [47.0, -75.25], [47.25, -75.35], [47.5, -75.25], [47.75, -75.35], [48.0, -75.25], [48.25, -75.35], [48.5, -75.25], [48.75, -75.35], [49.0, -75.25], [49.53, -75.47], [49.68, -75.82], [49.75, -75.85], [50.0, -75.75], [50.53, -75.97], [50.75, -76.5], [50.65, -76.75], [50.75, -77.0], [50.65, -77.25], [50.75, -77.5], [50.53, -78.03], [50.0, -78.25], [49.75, -78.15], [49.68, -78.18], [49.53, -78.53], [49.0, -78.75], [48.75, -78.65], [48.68, -78.68], [48.53, -79.03], [48.0, -79.25], [47.47, -79.03], [47.32, -78.68], [47.25, -78.65], [47.0, -78.75], [46.75, -78.65], [46.5, -78.75], [46.25, -78.65], [46.0, -78.75], [45.47, -78.53], [45.32, -78.18], [44.97, -78.03], [44.82, -77.68], [44.47, -77.53], [44.25, -77.0], [44.35, -76.75], [44.25, -76.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -13.055584264719812}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -9.861873445618953}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-66.21273206075031, -66.01882455008368, -67.72510058085123, -67.7016698201497, -67.14157673323231, -67.58258196289776, -67.39157799614802, -66.43045569525825]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-66.21273206075031, -66.85252990722654, -68.87008450826008, -69.56973622639973, -70.40042724609373, -70.40748316446937, -70.03845062255857, -69.34627634684242]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-7.737824508054189, -7.981496896350429, -9.091987575018365, -8.74449103582173, -9.552892402055969, -10.242780342013107, -10.78591841234291, -9.362613162862024]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-7.737824508054189, -8.543916241953013, -9.990835186392076, -9.512311647803983, -12.354478879564368, -13.055584264719812, -12.64360780777568, -10.854387743006527]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.2559503233263614, -1.2686403975579272, -1.3965848630733217, -1.2980476470395026, -1.3777516600823874, -1.51853767151226, -1.6042918798846098, -1.427196329433862]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.2559503233263614, -1.352056178430187, -1.5529352696504715, -1.418024486570997, -1.6978568599757775, -1.8705838649551902, -1.8447196675569117, -1.6313874882262815]}}