{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:10:08.480222", "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-05_to_2026-Feb-07_122.5_43.5"}, "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": 2026020000137}, "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 05 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "February 07 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": 81421.85274948945}, "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": ["China"]}, "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": 43.5}, "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": 122.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "122.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 119.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 123.75}, "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": 45.25}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[118.75, 41.5], [118.85, 41.75], [118.75, 42.0], [118.97, 42.53], [119.5, 42.75], [119.75, 42.65], [120.0, 42.75], [120.3, 42.63], [120.35, 42.75], [120.25, 43.0], [120.35, 43.25], [120.25, 43.5], [120.47, 44.03], [120.82, 44.18], [120.85, 44.25], [120.75, 44.5], [120.97, 45.03], [121.5, 45.25], [121.75, 45.15], [121.82, 45.18], [121.97, 45.53], [122.5, 45.75], [122.75, 45.65], [123.0, 45.75], [123.53, 45.53], [123.75, 45.0], [123.65, 44.75], [123.75, 44.5], [123.65, 44.25], [123.68, 44.18], [124.03, 44.03], [124.25, 43.5], [124.03, 42.97], [123.68, 42.82], [123.53, 42.47], [123.18, 42.32], [123.03, 41.97], [122.5, 41.75], [122.25, 41.85], [122.18, 41.82], [122.03, 41.47], [121.68, 41.32], [121.53, 40.97], [121.0, 40.75], [120.75, 40.85], [120.68, 40.82], [120.53, 40.47], [120.18, 40.32], [120.03, 39.97], [119.5, 39.75], [118.97, 39.97], [118.75, 40.5], [118.85, 40.75], [118.75, 41.0], [118.85, 41.25], [118.75, 41.5]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Siberia", "E.Asia"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-02-05T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[118.75, 41.0], [118.85, 41.25], [118.75, 41.5], [118.85, 41.75], [118.75, 42.0], [118.97, 42.53], [119.5, 42.75], [119.75, 42.65], [120.0, 42.75], [120.3, 42.63], [120.35, 42.75], [120.25, 43.0], [120.35, 43.25], [120.25, 43.5], [120.47, 44.03], [120.82, 44.18], [120.85, 44.25], [120.75, 44.5], [120.97, 45.03], [121.5, 45.25], [121.75, 45.15], [121.82, 45.18], [121.97, 45.53], [122.5, 45.75], [122.75, 45.65], [123.0, 45.75], [123.53, 45.53], [123.75, 45.0], [123.65, 44.75], [123.75, 44.5], [123.65, 44.25], [123.68, 44.18], [124.03, 44.03], [124.25, 43.5], [124.03, 42.97], [123.68, 42.82], [123.53, 42.47], [123.18, 42.32], [123.03, 41.97], [122.5, 41.75], [122.25, 41.85], [122.18, 41.82], [122.03, 41.47], [121.68, 41.32], [121.53, 40.97], [121.0, 40.75], [120.75, 40.85], [120.68, 40.82], [120.53, 40.47], [120.18, 40.32], [120.03, 39.97], [119.5, 39.75], [118.97, 39.97], [118.75, 40.5], [118.85, 40.75], [118.75, 41.0]]]]}, "2026-02-06T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[118.75, 41.0], [118.85, 41.25], [118.75, 41.5], [118.85, 41.75], [118.75, 42.0], [118.97, 42.53], [119.5, 42.75], [119.75, 42.65], [120.0, 42.75], [120.3, 42.63], [120.35, 42.75], [120.25, 43.0], [120.35, 43.25], [120.25, 43.5], [120.47, 44.03], [120.82, 44.18], [120.85, 44.25], [120.75, 44.5], [120.97, 45.03], [121.5, 45.25], [121.75, 45.15], [121.82, 45.18], [121.97, 45.53], [122.5, 45.75], [122.75, 45.65], [123.0, 45.75], [123.53, 45.53], [123.75, 45.0], [123.65, 44.75], [123.75, 44.5], [123.65, 44.25], [123.68, 44.18], [124.03, 44.03], [124.25, 43.5], [124.03, 42.97], [123.68, 42.82], [123.53, 42.47], [123.18, 42.32], [123.03, 41.97], [122.5, 41.75], [122.25, 41.85], [122.18, 41.82], [122.03, 41.47], [121.68, 41.32], [121.53, 40.97], [121.0, 40.75], [120.75, 40.85], [120.68, 40.82], [120.53, 40.47], 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[120.53, 40.47], [120.18, 40.32], [120.03, 39.97], [119.5, 39.75], [118.97, 39.97], [118.75, 40.5], [118.85, 40.75], [118.75, 41.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -9.90881628560254}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -7.671350895549535}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-16.180147199277542, -17.797362497117774, -15.446909844433833]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-18.224482599894174, -19.837105178832985, -18.0798540751139]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-7.173613385718767, -8.973009984451288, -6.867429316478553]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-8.529381493178448, -9.90881628560254, -8.045010837709725]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.469344108956642, -1.8850176450929292, -1.448369068754743]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.7080896039613471, -2.0926392063353703, -1.6752326729488158]}}