{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:10:08.874861", "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-06_to_2026-Feb-08_127.0_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": 2026020000156}, "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 06 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "February 08 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": 110604.28415470876}, "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", "Korea, Democratic People's Republic of", "Korea, Republic of"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Asia", "Asia", "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": ["Sea of Japan", "Yellow Sea"]}, "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": 127.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "127.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 124.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 129.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 35.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 41.75}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[125.0, 41.25], [125.25, 41.15], [125.5, 41.25], [125.75, 41.15], [125.82, 41.18], [125.85, 41.25], [125.75, 41.5], [125.97, 42.03], [126.5, 42.25], [127.0, 42.04], [127.5, 42.25], [128.03, 42.03], [128.25, 41.5], [128.03, 40.97], [127.68, 40.82], [127.65, 40.75], [127.75, 40.5], [127.63, 40.2], [127.75, 40.15], [128.0, 40.25], [128.25, 40.15], [128.5, 40.25], [129.03, 40.03], [129.18, 39.68], [129.53, 39.53], [129.68, 39.18], [130.03, 39.03], [130.25, 38.5], [130.03, 37.97], [129.5, 37.75], [129.25, 37.85], [129.0, 37.75], [128.47, 37.97], [128.32, 38.32], [128.25, 38.35], [128.0, 38.25], [127.7, 38.38], [127.65, 38.25], [127.75, 38.0], [127.65, 37.75], [127.75, 37.5], [127.65, 37.25], [127.75, 37.0], [127.65, 36.75], [127.75, 36.5], [127.53, 35.97], [127.18, 35.82], [127.15, 35.75], [127.25, 35.5], [127.03, 34.97], [126.5, 34.75], [125.97, 34.97], [125.75, 35.5], [125.85, 35.75], [125.75, 36.0], [125.85, 36.25], [125.75, 36.5], [125.85, 36.75], [125.82, 36.82], [125.47, 36.97], [125.32, 37.32], [124.97, 37.47], [124.82, 37.82], [124.47, 37.97], [124.25, 38.5], [124.47, 39.03], [124.82, 39.18], [124.85, 39.25], [124.82, 39.32], [124.47, 39.47], [124.25, 40.0], [124.35, 40.25], [124.25, 40.5], [124.47, 41.03], [125.0, 41.25]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Asia"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-02-06T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[124.25, 40.5], [124.47, 41.03], [125.0, 41.25], [125.25, 41.15], [125.5, 41.25], [125.75, 41.15], [125.82, 41.18], [125.85, 41.25], [125.75, 41.5], [125.97, 42.03], [126.5, 42.25], [127.0, 42.04], [127.5, 42.25], [128.03, 42.03], [128.25, 41.5], [128.03, 40.97], [127.68, 40.82], [127.65, 40.75], [127.75, 40.5], [127.63, 40.2], [127.75, 40.15], [128.0, 40.25], [128.25, 40.15], [128.5, 40.25], [129.03, 40.03], [129.18, 39.68], [129.53, 39.53], [129.68, 39.18], [130.03, 39.03], [130.25, 38.5], [130.03, 37.97], [129.5, 37.75], [129.25, 37.85], [129.0, 37.75], [128.47, 37.97], [128.32, 38.32], [128.25, 38.35], [128.0, 38.25], [127.7, 38.38], [127.65, 38.25], [127.75, 38.0], [127.65, 37.75], [127.75, 37.5], [127.65, 37.25], [127.75, 37.0], [127.65, 36.75], [127.75, 36.5], [127.53, 35.97], [127.18, 35.82], [127.15, 35.75], [127.25, 35.5], [127.03, 34.97], [126.5, 34.75], [125.97, 34.97], [125.75, 35.5], [125.85, 35.75], [125.75, 36.0], [125.85, 36.25], [125.75, 36.5], [125.85, 36.75], [125.82, 36.82], [125.47, 36.97], [125.32, 37.32], [124.97, 37.47], [124.82, 37.82], [124.47, 37.97], [124.25, 38.5], [124.47, 39.03], [124.82, 39.18], [124.85, 39.25], [124.82, 39.32], [124.47, 39.47], [124.25, 40.0], [124.35, 40.25], [124.25, 40.5]]]]}, "2026-02-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[124.25, 40.5], [124.47, 41.03], [125.0, 41.25], [125.25, 41.15], [125.5, 41.25], [125.75, 41.15], [125.82, 41.18], [125.85, 41.25], [125.75, 41.5], [125.97, 42.03], [126.5, 42.25], [127.0, 42.04], [127.5, 42.25], [128.03, 42.03], [128.25, 41.5], [128.03, 40.97], [127.68, 40.82], [127.65, 40.75], [127.75, 40.5], [127.63, 40.2], [127.75, 40.15], [128.0, 40.25], [128.25, 40.15], [128.5, 40.25], [129.03, 40.03], [129.18, 39.68], [129.53, 39.53], [129.68, 39.18], [130.03, 39.03], [130.25, 38.5], [130.03, 37.97], [129.5, 37.75], [129.25, 37.85], [129.0, 37.75], [128.47, 37.97], [128.32, 38.32], [128.25, 38.35], [128.0, 38.25], [127.7, 38.38], [127.65, 38.25], [127.75, 38.0], [127.65, 37.75], [127.75, 37.5], [127.65, 37.25], [127.75, 37.0], [127.65, 36.75], [127.75, 36.5], [127.53, 35.97], [127.18, 35.82], [127.15, 35.75], [127.25, 35.5], [127.03, 34.97], [126.5, 34.75], [125.97, 34.97], [125.75, 35.5], [125.85, 35.75], [125.75, 36.0], [125.85, 36.25], [125.75, 36.5], [125.85, 36.75], [125.82, 36.82], [125.47, 36.97], [125.32, 37.32], [124.97, 37.47], [124.82, 37.82], [124.47, 37.97], [124.25, 38.5], [124.47, 39.03], [124.82, 39.18], [124.85, 39.25], [124.82, 39.32], [124.47, 39.47], [124.25, 40.0], [124.35, 40.25], [124.25, 40.5]]]]}, "2026-02-08T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[124.25, 40.5], [124.47, 41.03], [125.0, 41.25], [125.25, 41.15], [125.5, 41.25], [125.75, 41.15], [125.82, 41.18], [125.85, 41.25], [125.75, 41.5], [125.97, 42.03], [126.5, 42.25], [127.0, 42.04], [127.5, 42.25], [128.03, 42.03], [128.25, 41.5], [128.03, 40.97], [127.68, 40.82], [127.65, 40.75], [127.75, 40.5], [127.63, 40.2], [127.75, 40.15], [128.0, 40.25], [128.25, 40.15], [128.5, 40.25], [129.03, 40.03], [129.18, 39.68], [129.53, 39.53], [129.68, 39.18], [130.03, 39.03], [130.25, 38.5], [130.03, 37.97], [129.5, 37.75], [129.25, 37.85], [129.0, 37.75], [128.47, 37.97], [128.32, 38.32], [128.25, 38.35], [128.0, 38.25], [127.7, 38.38], [127.65, 38.25], [127.75, 38.0], [127.65, 37.75], [127.75, 37.5], [127.65, 37.25], [127.75, 37.0], [127.65, 36.75], [127.75, 36.5], [127.53, 35.97], [127.18, 35.82], [127.15, 35.75], [127.25, 35.5], [127.03, 34.97], [126.5, 34.75], [125.97, 34.97], [125.75, 35.5], [125.85, 35.75], [125.75, 36.0], [125.85, 36.25], [125.75, 36.5], [125.85, 36.75], [125.82, 36.82], [125.47, 36.97], [125.32, 37.32], [124.97, 37.47], [124.82, 37.82], [124.47, 37.97], [124.25, 38.5], [124.47, 39.03], [124.82, 39.18], [124.85, 39.25], [124.82, 39.32], [124.47, 39.47], [124.25, 40.0], [124.35, 40.25], [124.25, 40.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -13.84673965118651}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -7.114845220054184}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-11.554588174128867, -11.572956632531202, -9.681341165736114]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-27.813179397582985, -26.077654902140267, -21.59957415262855]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-7.571276191127506, -7.74862473969896, -6.0246347293360865]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-13.84673965118651, -12.274056782004521, -9.406388724823131]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.9742463904685146, -2.066850024340201, -1.569156951232197]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.914728573029494, -2.4779327416495645, -1.9827931599836062]}}