{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:06:52.054755", "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-Aug-04_to_2025-Aug-07_113.5_24.5"}, "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": 2025080000246}, "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": "August 04 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 07 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 4}, "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": 146849.37425450666}, "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": 24.5}, "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": 113.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "113.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 109.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 116.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 22.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 25.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[109.5, 24.75], [109.75, 24.65], [110.0, 24.75], [110.25, 24.65], [110.32, 24.68], [110.47, 25.03], [111.0, 25.25], [111.25, 25.15], [111.5, 25.25], [111.75, 25.15], [111.82, 25.18], [111.97, 25.53], [112.5, 25.75], [113.0, 25.54], [113.5, 25.75], [113.75, 25.65], [113.82, 25.68], [113.97, 26.03], [114.5, 26.25], [114.75, 26.15], [115.0, 26.25], [115.25, 26.15], [115.5, 26.25], [116.03, 26.03], [116.25, 25.5], [116.04, 25.0], [116.18, 24.68], [116.53, 24.53], [116.75, 24.0], [116.53, 23.47], [116.13, 23.3], [116.25, 23.0], [116.03, 22.47], [115.5, 22.25], [115.25, 22.35], [115.0, 22.25], [114.47, 22.47], [114.32, 22.82], [114.25, 22.85], [114.0, 22.75], [113.75, 22.85], [113.5, 22.75], [113.25, 22.85], [113.18, 22.82], [113.03, 22.47], [112.68, 22.32], [112.53, 21.97], [112.0, 21.75], [111.75, 21.85], [111.5, 21.75], [110.97, 21.97], [110.82, 22.32], [110.75, 22.35], [110.5, 22.25], [109.97, 22.47], [109.82, 22.82], [109.47, 22.97], [109.32, 23.32], [108.97, 23.47], [108.75, 24.0], [108.97, 24.53], [109.5, 24.75]]]]}}, "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": {"2025-08-04T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[112.75, 24.0], [112.85, 24.25], [112.75, 24.5], [112.97, 25.03], [113.5, 25.25], [113.75, 25.15], [114.0, 25.25], [114.3, 25.13], [114.47, 25.53], [115.0, 25.75], [115.53, 25.53], [115.68, 25.18], [116.03, 25.03], [116.18, 24.68], [116.53, 24.53], [116.75, 24.0], [116.53, 23.47], [116.13, 23.3], [116.25, 23.0], [116.03, 22.47], [115.5, 22.25], [115.25, 22.35], [115.0, 22.25], [114.47, 22.47], [114.32, 22.82], [114.25, 22.85], [114.0, 22.75], [113.75, 22.85], [113.5, 22.75], [112.97, 22.97], [112.75, 23.5], [112.85, 23.75], [112.75, 24.0]]]]}, "2025-08-05T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[108.97, 23.47], [108.75, 24.0], [108.97, 24.53], [109.5, 24.75], [109.75, 24.65], [110.0, 24.75], [110.25, 24.65], [110.32, 24.68], [110.47, 25.03], [111.0, 25.25], [111.25, 25.15], [111.5, 25.25], [111.75, 25.15], [111.82, 25.18], [111.97, 25.53], [112.5, 25.75], [113.0, 25.54], [113.5, 25.75], [113.75, 25.65], [113.82, 25.68], [113.97, 26.03], [114.5, 26.25], [114.75, 26.15], [115.0, 26.25], [115.25, 26.15], [115.5, 26.25], [116.03, 26.03], [116.25, 25.5], [116.04, 25.0], [116.18, 24.68], [116.53, 24.53], [116.75, 24.0], [116.53, 23.47], [116.13, 23.3], [116.25, 23.0], [116.03, 22.47], [115.5, 22.25], [115.25, 22.35], [115.0, 22.25], [114.47, 22.47], [114.32, 22.82], [114.25, 22.85], [114.0, 22.75], [113.75, 22.85], [113.5, 22.75], [113.25, 22.85], [113.18, 22.82], [113.03, 22.47], [112.68, 22.32], [112.53, 21.97], [112.0, 21.75], [111.75, 21.85], [111.5, 21.75], [110.97, 21.97], [110.82, 22.32], [110.75, 22.35], [110.5, 22.25], [109.97, 22.47], [109.82, 22.82], [109.47, 22.97], [109.32, 23.32], [108.97, 23.47]]]]}, "2025-08-06T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[108.97, 23.47], [108.75, 24.0], [108.97, 24.53], [109.5, 24.75], [109.75, 24.65], [110.0, 24.75], [110.25, 24.65], [110.32, 24.68], [110.47, 25.03], [111.0, 25.25], [111.25, 25.15], [111.5, 25.25], [111.75, 25.15], [111.82, 25.18], [111.97, 25.53], [112.5, 25.75], [113.0, 25.54], [113.5, 25.75], [113.75, 25.65], [113.82, 25.68], [113.97, 26.03], [114.5, 26.25], [114.75, 26.15], [115.0, 26.25], [115.25, 26.15], [115.5, 26.25], [116.03, 26.03], [116.25, 25.5], [116.04, 25.0], [116.18, 24.68], [116.53, 24.53], [116.75, 24.0], [116.53, 23.47], [116.13, 23.3], [116.25, 23.0], [116.03, 22.47], [115.5, 22.25], [115.25, 22.35], [115.0, 22.25], [114.47, 22.47], [114.32, 22.82], [114.25, 22.85], [114.0, 22.75], [113.75, 22.85], [113.5, 22.75], [113.25, 22.85], [113.18, 22.82], [113.03, 22.47], [112.68, 22.32], [112.53, 21.97], [112.0, 21.75], [111.75, 21.85], [111.5, 21.75], [110.97, 21.97], [110.82, 22.32], [110.75, 22.35], [110.5, 22.25], [109.97, 22.47], [109.82, 22.82], [109.47, 22.97], [109.32, 23.32], [108.97, 23.47]]]]}, "2025-08-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[108.97, 23.47], [108.75, 24.0], [108.97, 24.53], [109.5, 24.75], [109.75, 24.65], [110.0, 24.75], [110.25, 24.65], [110.32, 24.68], [110.47, 25.03], [111.0, 25.25], [111.25, 25.15], [111.5, 25.25], [111.75, 25.15], [111.82, 25.18], [111.97, 25.53], [112.5, 25.75], [113.0, 25.54], [113.5, 25.75], [113.75, 25.65], [113.82, 25.68], [113.97, 26.03], [114.5, 26.25], [114.75, 26.15], [115.0, 26.25], [115.25, 26.15], [115.5, 26.25], [116.03, 26.03], [116.25, 25.5], [116.03, 24.97], [115.68, 24.82], [115.65, 24.75], [115.75, 24.5], [115.53, 23.97], [115.18, 23.82], [115.03, 23.47], [114.68, 23.32], [114.53, 22.97], [114.0, 22.75], [113.75, 22.85], [113.5, 22.75], [113.25, 22.85], [113.18, 22.82], [113.03, 22.47], [112.68, 22.32], [112.53, 21.97], [112.0, 21.75], [111.75, 21.85], [111.5, 21.75], [110.97, 21.97], [110.82, 22.32], [110.75, 22.35], [110.5, 22.25], [109.97, 22.47], [109.82, 22.82], [109.47, 22.97], [109.32, 23.32], [108.97, 23.47]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.228752249546744}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.9575118776224385}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [25.39360625323127, 25.128139163286278, 24.953087009527735, 25.15119346849849]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [24.825213368733728, 23.930652872721396, 23.347083028157556, 23.269141133626306]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.629539143365695, -2.9285894231437983, -3.1219348099925286, -2.9240916874408303]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.0867827584121983, -3.4182231139577084, -4.006878352716512, -4.228752249546744]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.7191738410035233, -1.8911296887067859, -2.037445857210446, -1.9433086332383822]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.0611504770116644, -2.3038228894613497, -2.6911456098184052, -2.744445835502055]}}