{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:10:15.913981", "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-18_to_2026-Feb-23_46.5_15.0"}, "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": 2026020000447}, "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 18 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "February 23 2026"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 6}, "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": 50720.03637817847}, "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": ["Yemen"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Asia"]}, "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": 15.0}, "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": 46.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "46.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 44.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 47.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 14.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 16.75}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[47.0, 15.75], [47.53, 15.53], [47.75, 15.0], [47.53, 14.47], [47.18, 14.32], [47.03, 13.97], [46.5, 13.75], [46.25, 13.85], [46.0, 13.75], [45.75, 13.85], [45.5, 13.75], [45.25, 13.85], [45.0, 13.75], [44.75, 13.85], [44.5, 13.75], [43.97, 13.97], [43.75, 14.5], [43.85, 14.75], [43.75, 15.0], [43.85, 15.25], [43.75, 15.5], [43.85, 15.75], [43.75, 16.0], [43.85, 16.25], [43.75, 16.5], [43.97, 17.03], [44.5, 17.25], [45.03, 17.03], [45.18, 16.68], [45.53, 16.53], [45.68, 16.18], [46.03, 16.03], [46.18, 15.68], [46.25, 15.65], [46.5, 15.75], [46.75, 15.65], [47.0, 15.75]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Arabian-Peninsula"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-02-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[44.47, 15.47], [44.25, 16.0], [44.47, 16.53], [45.0, 16.75], [45.53, 16.53], [45.68, 16.18], [46.03, 16.03], [46.18, 15.68], [46.25, 15.65], [46.5, 15.75], [46.75, 15.65], [47.0, 15.75], [47.53, 15.53], [47.75, 15.0], [47.53, 14.47], [47.18, 14.32], [47.03, 13.97], [46.5, 13.75], [46.25, 13.85], [46.0, 13.75], [45.5, 13.96], [45.0, 13.75], [44.47, 13.97], [44.25, 14.5], [44.47, 15.03], [44.88, 15.2], [44.82, 15.32], [44.47, 15.47]]]]}, "2026-02-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[44.25, 15.0], [44.46, 15.5], [44.25, 16.0], [44.47, 16.53], [45.0, 16.75], [45.53, 16.53], [45.68, 16.18], [46.03, 16.03], [46.18, 15.68], [46.25, 15.65], [46.5, 15.75], [46.75, 15.65], [47.0, 15.75], [47.53, 15.53], [47.75, 15.0], [47.53, 14.47], [47.18, 14.32], [47.03, 13.97], [46.5, 13.75], [46.25, 13.85], [46.0, 13.75], [45.75, 13.85], [45.5, 13.75], [45.25, 13.85], [45.0, 13.75], [44.47, 13.97], [44.25, 14.5], [44.35, 14.75], [44.25, 15.0]]]]}, "2026-02-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[43.75, 15.0], [43.85, 15.25], [43.75, 15.5], [43.85, 15.75], [43.75, 16.0], [43.85, 16.25], [43.75, 16.5], [43.97, 17.03], [44.5, 17.25], [45.03, 17.03], [45.18, 16.68], [45.53, 16.53], [45.68, 16.18], [46.03, 16.03], [46.18, 15.68], [46.25, 15.65], [46.5, 15.75], [46.75, 15.65], [47.0, 15.75], [47.53, 15.53], [47.75, 15.0], [47.53, 14.47], [47.18, 14.32], [47.03, 13.97], [46.5, 13.75], [46.25, 13.85], [46.0, 13.75], [45.75, 13.85], [45.5, 13.75], [45.25, 13.85], [45.0, 13.75], [44.75, 13.85], [44.5, 13.75], [43.97, 13.97], [43.75, 14.5], [43.85, 14.75], [43.75, 15.0]]]]}, "2026-02-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[43.75, 15.0], [43.85, 15.25], [43.75, 15.5], [43.85, 15.75], [43.75, 16.0], [43.85, 16.25], [43.75, 16.5], [43.97, 17.03], [44.5, 17.25], [45.03, 17.03], [45.18, 16.68], [45.53, 16.53], [45.68, 16.18], [46.03, 16.03], [46.18, 15.68], [46.25, 15.65], [46.5, 15.75], [46.75, 15.65], [47.0, 15.75], [47.53, 15.53], [47.75, 15.0], [47.53, 14.47], [47.18, 14.32], [47.03, 13.97], [46.5, 13.75], [46.25, 13.85], [46.0, 13.75], [45.75, 13.85], [45.5, 13.75], [45.25, 13.85], [45.0, 13.75], [44.75, 13.85], [44.5, 13.75], [43.97, 13.97], [43.75, 14.5], [43.85, 14.75], [43.75, 15.0]]]]}, "2026-02-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[43.75, 15.0], [43.85, 15.25], [43.75, 15.5], [43.85, 15.75], [43.75, 16.0], [43.85, 16.25], [43.75, 16.5], [43.97, 17.03], [44.5, 17.25], [45.03, 17.03], [45.18, 16.68], [45.53, 16.53], [45.68, 16.18], [46.03, 16.03], [46.18, 15.68], [46.25, 15.65], [46.5, 15.75], [46.75, 15.65], [47.0, 15.75], [47.53, 15.53], [47.75, 15.0], [47.53, 14.47], [47.18, 14.32], [47.03, 13.97], [46.5, 13.75], [46.25, 13.85], [46.0, 13.75], [45.75, 13.85], [45.5, 13.75], [45.25, 13.85], [45.0, 13.75], [44.75, 13.85], [44.5, 13.75], [43.97, 13.97], [43.75, 14.5], [43.85, 14.75], [43.75, 15.0]]]]}, "2026-02-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[45.97, 15.53], [46.5, 15.75], [47.03, 15.53], [47.25, 15.0], [47.03, 14.47], [46.68, 14.32], [46.53, 13.97], [46.0, 13.75], [45.47, 13.97], [45.25, 14.5], [45.47, 15.03], [45.82, 15.18], [45.97, 15.53]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.6503393031808855}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.6559551090999727}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [18.071865336100245, 17.444551548813365, 16.8789370966893, 16.673912901036886, 17.006206766764365, 19.0195137023926]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [15.71539967854818, 15.062730407714866, 12.564139302571618, 11.99838536580404, 13.526170349121116, 18.332949574788415]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.3684382730004643, -3.864197622052323, -3.582799555064031, -3.9099377821001338, -3.5386832471156957, -3.0618330169384365]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.800729586609407, -4.6503393031808855, -4.148570046796408, -4.53060973944315, -4.163876934141001, -3.3765272384641776]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.62873680145396, -1.7732315570890052, -1.6744575652904643, -1.854865519681373, -1.6659416892247347, -1.4779348758653228]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.160300596875091, -2.158198728219993, -2.1520889282896887, -2.492095890722175, -2.0698746716707794, -1.5972145732495595]}}