{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:03:23.832475", "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-Feb-04_to_2025-Feb-13_87.0_45.5"}, "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": 2025020000154}, "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 04 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "February 13 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 10}, "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": 50326.08553660968}, "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": 45.5}, "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": 87.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "87.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 85.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 90.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 44.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 46.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[86.0, 43.75], [85.47, 43.97], [85.32, 44.32], [84.97, 44.47], [84.75, 45.0], [84.97, 45.53], [85.32, 45.68], [85.35, 45.75], [85.25, 46.0], [85.47, 46.53], [86.0, 46.75], [86.25, 46.65], [86.5, 46.75], [86.75, 46.65], [87.0, 46.75], [87.53, 46.53], [87.68, 46.18], [88.03, 46.03], [88.18, 45.68], [88.25, 45.65], [88.5, 45.75], [89.03, 45.53], [89.18, 45.18], [89.25, 45.15], [89.5, 45.25], [89.75, 45.15], [90.0, 45.25], [90.53, 45.03], [90.75, 44.5], [90.53, 43.97], [90.0, 43.75], [89.75, 43.85], [89.5, 43.75], [89.25, 43.85], [89.0, 43.75], [88.75, 43.85], [88.5, 43.75], [88.25, 43.85], [88.18, 43.82], [88.03, 43.47], [87.5, 43.25], [87.25, 43.35], [87.0, 43.25], [86.47, 43.47], [86.32, 43.82], [86.25, 43.85], [86.0, 43.75]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.Siberia", "E.Siberia", "E.C.Asia"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-02-04T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[87.0, 43.25], [86.47, 43.47], [86.25, 44.0], [86.47, 44.53], [87.0, 44.75], [87.25, 44.65], [87.5, 44.75], [87.93, 44.57], [87.75, 45.0], [87.97, 45.53], [88.5, 45.75], [89.03, 45.53], [89.25, 45.0], [89.03, 44.47], [88.5, 44.25], [88.07, 44.43], [88.25, 44.0], [88.03, 43.47], [87.5, 43.25], [87.25, 43.35], [87.0, 43.25]]]]}, "2025-02-05T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[86.47, 44.97], [86.25, 45.5], [86.47, 46.03], [87.0, 46.25], [87.25, 46.15], [87.5, 46.25], [88.03, 46.03], [88.18, 45.68], [88.25, 45.65], [88.5, 45.75], [89.03, 45.53], [89.18, 45.18], [89.25, 45.15], [89.5, 45.25], [89.75, 45.15], [90.0, 45.25], [90.53, 45.03], [90.75, 44.5], [90.53, 43.97], [90.0, 43.75], [89.75, 43.85], [89.5, 43.75], [89.25, 43.85], [89.0, 43.75], [88.47, 43.97], [88.32, 44.32], [88.25, 44.35], [88.13, 44.3], [88.25, 44.0], [88.03, 43.47], [87.5, 43.25], [87.25, 43.35], [87.0, 43.25], [86.47, 43.47], [86.25, 44.0], [86.47, 44.53], [87.0, 44.75], [86.47, 44.97]], [[87.25, 44.65], [87.38, 44.7], [87.32, 44.82], [87.25, 44.85], [87.0, 44.75], [87.25, 44.65]]]]}, "2025-02-06T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[84.97, 44.47], [84.75, 45.0], [84.97, 45.53], [85.32, 45.68], [85.35, 45.75], [85.25, 46.0], [85.47, 46.53], [86.0, 46.75], [86.25, 46.65], [86.5, 46.75], [86.75, 46.65], [87.0, 46.75], [87.53, 46.53], [87.68, 46.18], [88.03, 46.03], [88.18, 45.68], [88.25, 45.65], [88.5, 45.75], [89.03, 45.53], [89.18, 45.18], [89.25, 45.15], [89.5, 45.25], [89.75, 45.15], [90.0, 45.25], [90.53, 45.03], [90.75, 44.5], [90.53, 43.97], [90.0, 43.75], [89.75, 43.85], [89.5, 43.75], [89.25, 43.85], [89.0, 43.75], [88.75, 43.85], [88.5, 43.75], [88.25, 43.85], [88.18, 43.82], [88.03, 43.47], [87.5, 43.25], [87.25, 43.35], [87.0, 43.25], [86.47, 43.47], [86.32, 43.82], [86.25, 43.85], [86.0, 43.75], [85.47, 43.97], [85.32, 44.32], [84.97, 44.47]]]]}, "2025-02-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[84.97, 44.47], [84.75, 45.0], [84.97, 45.53], [85.32, 45.68], [85.35, 45.75], [85.25, 46.0], [85.47, 46.53], [86.0, 46.75], [86.25, 46.65], [86.5, 46.75], [86.75, 46.65], [87.0, 46.75], [87.53, 46.53], [87.68, 46.18], [88.03, 46.03], [88.18, 45.68], [88.53, 45.53], [88.68, 45.18], [88.75, 45.15], [89.0, 45.25], [89.25, 45.15], [89.5, 45.25], [89.75, 45.15], [90.0, 45.25], [90.53, 45.03], [90.75, 44.5], [90.53, 43.97], [90.0, 43.75], [89.75, 43.85], [89.5, 43.75], [89.25, 43.85], [89.0, 43.75], [88.75, 43.85], [88.5, 43.75], [88.25, 43.85], [88.18, 43.82], [88.03, 43.47], [87.5, 43.25], [86.97, 43.47], [86.82, 43.82], [86.75, 43.85], [86.5, 43.75], [86.25, 43.85], [86.0, 43.75], [85.47, 43.97], [85.32, 44.32], [84.97, 44.47]]]]}, "2025-02-08T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[84.97, 44.47], [84.75, 45.0], [84.97, 45.53], [85.32, 45.68], [85.35, 45.75], [85.25, 46.0], [85.47, 46.53], [86.0, 46.75], [86.25, 46.65], [86.5, 46.75], [86.75, 46.65], [87.0, 46.75], [87.53, 46.53], [87.75, 46.0], [87.65, 45.75], [87.7, 45.63], [88.0, 45.75], [88.25, 45.65], [88.5, 45.75], [89.03, 45.53], [89.18, 45.18], [89.25, 45.15], [89.5, 45.25], [89.75, 45.15], [90.0, 45.25], [90.53, 45.03], [90.75, 44.5], [90.53, 43.97], [90.0, 43.75], [89.75, 43.85], [89.5, 43.75], [89.25, 43.85], [89.0, 43.75], [88.75, 43.85], [88.5, 43.75], [88.25, 43.85], [88.0, 43.75], [87.75, 43.85], [87.5, 43.75], [87.25, 43.85], [87.0, 43.75], [86.75, 43.85], [86.5, 43.75], [86.25, 43.85], [86.0, 43.75], [85.47, 43.97], [85.32, 44.32], [84.97, 44.47]]]]}, "2025-02-09T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[84.97, 44.47], [84.75, 45.0], [84.97, 45.53], [85.32, 45.68], [85.35, 45.75], [85.25, 46.0], [85.47, 46.53], [86.0, 46.75], [86.25, 46.65], [86.5, 46.75], [86.75, 46.65], [87.0, 46.75], [87.53, 46.53], [87.75, 46.0], [87.65, 45.75], [87.7, 45.63], [88.0, 45.75], [88.25, 45.65], [88.5, 45.75], [89.03, 45.53], [89.18, 45.18], [89.25, 45.15], [89.5, 45.25], [89.75, 45.15], [90.0, 45.25], [90.53, 45.03], [90.75, 44.5], [90.53, 43.97], [90.0, 43.75], [89.75, 43.85], [89.5, 43.75], [89.25, 43.85], [89.0, 43.75], [88.75, 43.85], [88.5, 43.75], [88.25, 43.85], [88.0, 43.75], [87.75, 43.85], [87.5, 43.75], [87.25, 43.85], [87.0, 43.75], [86.75, 43.85], [86.5, 43.75], [86.25, 43.85], [86.0, 43.75], [85.47, 43.97], [85.32, 44.32], [84.97, 44.47]]]]}, "2025-02-10T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[85.25, 46.0], [85.47, 46.53], [86.0, 46.75], [86.25, 46.65], [86.5, 46.75], [86.75, 46.65], [87.0, 46.75], [87.53, 46.53], [87.75, 46.0], [87.65, 45.75], [87.75, 45.5], [87.63, 45.2], [87.75, 45.15], [87.82, 45.18], [87.97, 45.53], [88.5, 45.75], [89.03, 45.53], [89.18, 45.18], [89.25, 45.15], [89.5, 45.25], [89.75, 45.15], [90.0, 45.25], [90.53, 45.03], [90.75, 44.5], [90.53, 43.97], [90.0, 43.75], [89.75, 43.85], [89.5, 43.75], [89.25, 43.85], [89.0, 43.75], [88.75, 43.85], [88.5, 43.75], [88.25, 43.85], [88.0, 43.75], [87.75, 43.85], [87.5, 43.75], [87.25, 43.85], [87.0, 43.75], [86.75, 43.85], [86.5, 43.75], [85.97, 43.97], [85.82, 44.32], [85.47, 44.47], [85.25, 45.0], [85.46, 45.5], [85.25, 46.0]]]]}, "2025-02-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[90.0, 43.75], [89.47, 43.97], [89.25, 44.5], [89.47, 45.03], [90.0, 45.25], [90.53, 45.03], [90.75, 44.5], [90.53, 43.97], [90.0, 43.75]]], [[[85.97, 46.03], [86.5, 46.25], [86.75, 46.15], [87.0, 46.25], [87.53, 46.03], [87.75, 45.5], [87.54, 45.0], [87.75, 44.5], [87.53, 43.97], [87.0, 43.75], [86.75, 43.85], [86.5, 43.75], [85.97, 43.97], [85.75, 44.5], [85.96, 45.0], [85.75, 45.5], [85.97, 46.03]]]]}, "2025-02-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[85.75, 45.5], [85.97, 46.03], [86.5, 46.25], [86.75, 46.15], [87.0, 46.25], [87.53, 46.03], [87.75, 45.5], [87.54, 45.0], [87.75, 44.5], [87.53, 43.97], [87.0, 43.75], [86.75, 43.85], [86.5, 43.75], [85.97, 43.97], [85.75, 44.5], [85.96, 45.0], [85.75, 45.5]]]]}, "2025-02-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[86.5, 44.75], [85.97, 44.97], [85.75, 45.5], [85.97, 46.03], [86.5, 46.25], [86.75, 46.15], [87.0, 46.25], [87.53, 46.03], [87.75, 45.5], [87.53, 44.97], [87.0, 44.75], [86.75, 44.85], [86.5, 44.75]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -11.178406519473327}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -7.877979418390042}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-15.986897320217508, -18.284870670459895, -20.503536550549455, -20.58372193593823, -19.802968947092666, -20.819914531707695, -19.226777338981577, -18.71571413675946, -20.15251690546671, -19.276258532206185]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-16.94493141174314, -20.61027310689289, -22.741422398885078, -23.07856915791828, -22.173741404215463, -24.0218763987223, -21.826514307657845, -21.16343536376951, -20.723317209879525, -19.50859934488929]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.15706637295375, -6.830525627363294, -7.822502758101522, -8.136272412975567, -7.735511664356361, -9.019901001864493, -7.711139407206513, -7.310167555054312, -7.9717076707589385, -7.171051144996966]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.9916243231146495, -8.320890800643923, -9.798757581626518, -9.821501782343773, -9.233382450380503, -11.178406519473327, -9.380391863759883, -8.795340717576323, -8.303995999513376, -7.3281232206857965]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3145241860130117, -1.5362865877130716, -1.6688863718182303, -1.6824759906956863, -1.5587870166977988, -1.8150190088545544, -1.5628851023393568, -1.5033021198587997, -1.6194117936744838, -1.4534914734995183]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.3581463103694333, -1.7137567203866428, -1.999136569527959, -1.9753143951102754, -1.8398757672492345, -2.138555838361719, -1.9841803526814172, -1.7345934275191868, -1.700009745561521, -1.468375689950294]}}