{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:10:18.888894", "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-Feb-24_to_2026-Feb-26_52.5_-69.5"}, "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": 2026020000604}, "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": "February 24 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "February 26 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": 50209.24210456337}, "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": -69.5}, "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": 52.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "52.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 45.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 55.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -71.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -68.75}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[45.25, -71.5], [45.47, -70.97], [46.0, -70.75], [46.25, -70.85], [46.5, -70.75], [46.75, -70.85], [46.82, -70.82], [46.97, -70.47], [47.5, -70.25], [47.75, -70.35], [47.82, -70.32], [47.97, -69.97], [48.5, -69.75], [48.75, -69.85], [48.88, -69.8], [48.75, -69.5], [48.97, -68.97], [49.5, -68.75], [49.75, -68.85], [50.0, -68.75], [50.25, -68.85], [50.32, -68.82], [50.47, -68.47], [51.0, -68.25], [51.25, -68.35], [51.5, -68.25], [51.75, -68.35], [52.0, -68.25], [52.25, -68.35], [52.5, -68.25], [53.03, -68.47], [53.18, -68.82], [53.25, -68.85], [53.5, -68.75], [53.75, -68.85], [54.0, -68.75], [54.25, -68.85], [54.5, -68.75], [54.75, -68.85], [55.0, -68.75], [55.53, -68.97], [55.75, -69.5], [55.53, -70.03], [55.18, -70.18], [55.03, -70.53], [54.5, -70.75], [54.25, -70.65], [54.0, -70.75], [53.75, -70.65], [53.68, -70.68], [53.53, -71.03], [53.0, -71.25], [52.75, -71.15], [52.5, -71.25], [52.25, -71.15], [52.0, -71.25], [51.75, -71.15], [51.68, -71.18], [51.53, -71.53], [51.0, -71.75], [50.75, -71.65], [50.5, -71.75], [50.25, -71.65], [50.0, -71.75], [49.75, -71.65], [49.5, -71.75], [49.25, -71.65], [49.0, -71.75], [48.75, -71.65], [48.68, -71.68], [48.53, -72.03], [48.0, -72.25], [47.75, -72.15], [47.5, -72.25], [47.25, -72.15], [47.0, -72.25], [46.75, -72.15], [46.5, -72.25], [46.25, -72.15], [46.0, -72.25], [45.47, -72.03], [45.25, -71.5]]]]}}, "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": {"2026-02-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[46.0, -72.25], [45.47, -72.03], [45.25, -71.5], [45.47, -70.97], [46.0, -70.75], [46.25, -70.85], [46.5, -70.75], [46.75, -70.85], [46.82, -70.82], [46.97, -70.47], [47.5, -70.25], [47.75, -70.35], [47.82, -70.32], [47.97, -69.97], [48.5, -69.75], [48.75, -69.85], [48.88, -69.8], [48.75, -69.5], [48.97, -68.97], [49.5, -68.75], [49.75, -68.85], [50.0, -68.75], [50.25, -68.85], [50.32, -68.82], [50.47, -68.47], [51.0, -68.25], [51.25, -68.35], [51.5, -68.25], [51.75, -68.35], [52.0, -68.25], [52.25, -68.35], [52.5, -68.25], [53.03, -68.47], [53.18, -68.82], [53.25, -68.85], [53.5, -68.75], [53.75, -68.85], [54.0, -68.75], [54.25, -68.85], [54.5, -68.75], [54.75, -68.85], [55.0, -68.75], [55.53, -68.97], [55.75, -69.5], [55.53, -70.03], [55.18, -70.18], [55.03, -70.53], [54.5, -70.75], [54.25, -70.65], [54.0, -70.75], [53.75, -70.65], [53.68, -70.68], [53.53, -71.03], [53.0, -71.25], [52.75, -71.15], [52.5, -71.25], [52.25, -71.15], [52.0, -71.25], [51.75, -71.15], [51.68, -71.18], [51.53, -71.53], [51.0, -71.75], [50.75, -71.65], [50.5, -71.75], [50.25, -71.65], [50.0, -71.75], [49.75, -71.65], [49.5, -71.75], [49.25, -71.65], [49.0, -71.75], [48.75, -71.65], [48.68, -71.68], [48.53, -72.03], [48.0, -72.25], [47.75, -72.15], [47.5, -72.25], [47.25, -72.15], [47.0, -72.25], [46.75, -72.15], [46.5, -72.25], [46.25, -72.15], [46.0, -72.25]]]]}, "2026-02-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[46.0, -72.25], [45.47, -72.03], [45.25, -71.5], [45.47, -70.97], [46.0, -70.75], [46.25, -70.85], [46.5, -70.75], [46.75, -70.85], [46.82, -70.82], [46.97, -70.47], [47.5, -70.25], [47.75, -70.35], [47.82, -70.32], [47.97, -69.97], [48.5, -69.75], [48.75, -69.85], [48.88, -69.8], [48.75, -69.5], [48.97, -68.97], [49.5, -68.75], [49.75, -68.85], [50.0, -68.75], [50.25, -68.85], [50.32, -68.82], [50.47, -68.47], [51.0, -68.25], [51.25, -68.35], [51.5, -68.25], [51.75, -68.35], [52.0, -68.25], [52.25, -68.35], [52.5, -68.25], [53.03, -68.47], [53.18, -68.82], [53.25, -68.85], [53.5, -68.75], [53.75, -68.85], [54.0, -68.75], [54.25, -68.85], [54.5, -68.75], [54.75, -68.85], [55.0, -68.75], [55.53, -68.97], [55.75, -69.5], [55.53, -70.03], [55.18, -70.18], [55.03, -70.53], [54.5, -70.75], [54.25, -70.65], [54.0, -70.75], [53.75, -70.65], [53.68, -70.68], [53.53, -71.03], [53.0, -71.25], [52.75, -71.15], [52.5, -71.25], [52.25, -71.15], [52.0, -71.25], [51.75, -71.15], [51.68, -71.18], [51.53, -71.53], [51.0, -71.75], [50.75, -71.65], [50.5, -71.75], [50.25, -71.65], [50.0, -71.75], [49.75, -71.65], [49.5, -71.75], [49.25, -71.65], [49.0, -71.75], [48.75, -71.65], [48.68, -71.68], [48.53, -72.03], [48.0, -72.25], [47.75, -72.15], [47.5, -72.25], [47.25, -72.15], [47.0, -72.25], [46.75, -72.15], [46.5, -72.25], [46.25, -72.15], [46.0, -72.25]]]]}, "2026-02-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[46.0, -72.25], [45.47, -72.03], [45.25, -71.5], [45.47, -70.97], [46.0, -70.75], [46.25, -70.85], [46.5, -70.75], [46.75, -70.85], [46.82, -70.82], [46.97, -70.47], [47.5, -70.25], [47.75, -70.35], [47.82, -70.32], [47.97, -69.97], [48.5, -69.75], [48.75, -69.85], [48.88, -69.8], [48.75, -69.5], [48.97, -68.97], [49.5, -68.75], [49.75, -68.85], [50.0, -68.75], [50.25, -68.85], [50.32, -68.82], [50.47, -68.47], [51.0, -68.25], [51.25, -68.35], [51.5, -68.25], [51.75, -68.35], [52.0, -68.25], [52.25, -68.35], [52.5, -68.25], [53.03, -68.47], [53.18, -68.82], [53.25, -68.85], [53.5, -68.75], [53.75, -68.85], [54.0, -68.75], [54.25, -68.85], [54.5, -68.75], [54.75, -68.85], [55.0, -68.75], [55.53, -68.97], [55.75, -69.5], [55.53, -70.03], [55.18, -70.18], [55.03, -70.53], [54.5, -70.75], [54.25, -70.65], [54.0, -70.75], [53.75, -70.65], [53.68, -70.68], [53.53, -71.03], [53.0, -71.25], [52.75, -71.15], [52.5, -71.25], [52.25, -71.15], [52.0, -71.25], [51.75, -71.15], [51.68, -71.18], [51.53, -71.53], [51.0, -71.75], [50.75, -71.65], [50.5, -71.75], [50.25, -71.65], [50.0, -71.75], [49.75, -71.65], [49.5, -71.75], [49.25, -71.65], [49.0, -71.75], [48.75, -71.65], [48.68, -71.68], [48.53, -72.03], [48.0, -72.25], [47.75, -72.15], [47.5, -72.25], [47.25, -72.15], [47.0, -72.25], [46.75, -72.15], [46.5, -72.25], [46.25, -72.15], [46.0, -72.25]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -8.047141400350114}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -6.343833329041443}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-35.32630068461103, -37.2433553907606, -36.37364065382221]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-38.46667137145994, -40.38715591430662, -39.42528826395667]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.596492681970388, -7.29628183174776, -6.138725473406178]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.159349799630206, -8.047141400350114, -6.880279947759391]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.2999365138511398, -1.7338786903782666, -1.4748791833699428]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.393189571297983, -1.9350869794162917, -1.6531954868728087]}}