{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:25:14.451600", "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": "2021-Apr-29_to_2021-May-01_118.0_40.5"}, "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": 2021040001182}, "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": "April 29 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 01 2021"}, "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": 74453.41535155906}, "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"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Asia"]}, "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": 40.5}, "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": 118.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "118.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 113.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 120.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 39.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 42.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-04-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[113.47, 41.47], [113.25, 42.0], [113.47, 42.53], [114.0, 42.75], [114.25, 42.65], [114.5, 42.75], [114.75, 42.65], [115.0, 42.75], [115.25, 42.65], [115.5, 42.75], [115.75, 42.65], [116.0, 42.75], [116.25, 42.65], [116.5, 42.75], [117.03, 42.53], [117.18, 42.18], [117.25, 42.15], [117.5, 42.25], [117.75, 42.15], [118.0, 42.25], [118.53, 42.03], [118.68, 41.68], [118.75, 41.65], [119.0, 41.75], [119.25, 41.65], [119.5, 41.75], [119.75, 41.65], [120.0, 41.75], [120.25, 41.65], [120.5, 41.75], [121.03, 41.53], [121.25, 41.0], [121.03, 40.47], [120.68, 40.32], [120.53, 39.97], [120.18, 39.82], [120.03, 39.47], [119.5, 39.25], [118.97, 39.47], [118.82, 39.82], [118.75, 39.85], [118.5, 39.75], [118.25, 39.85], [118.0, 39.75], [117.47, 39.97], [117.32, 40.32], [117.25, 40.35], [117.0, 40.25], [116.75, 40.35], [116.68, 40.32], [116.53, 39.97], [116.0, 39.75], [115.47, 39.97], [115.32, 40.32], [115.25, 40.35], [115.0, 40.25], [114.47, 40.47], [114.25, 41.0], [114.35, 41.25], [114.32, 41.32], [114.25, 41.35], [114.0, 41.25], [113.47, 41.47]]]]}, "2021-04-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[113.47, 41.47], [113.25, 42.0], [113.47, 42.53], [114.0, 42.75], [114.25, 42.65], [114.5, 42.75], [114.75, 42.65], [115.0, 42.75], [115.25, 42.65], [115.5, 42.75], [115.75, 42.65], [116.0, 42.75], [116.25, 42.65], [116.5, 42.75], [117.03, 42.53], [117.18, 42.18], [117.25, 42.15], [117.5, 42.25], [117.75, 42.15], [118.0, 42.25], [118.53, 42.03], [118.68, 41.68], [118.75, 41.65], [119.0, 41.75], [119.25, 41.65], [119.5, 41.75], [119.75, 41.65], [120.0, 41.75], [120.25, 41.65], [120.5, 41.75], [121.03, 41.53], [121.25, 41.0], [121.03, 40.47], [120.68, 40.32], [120.53, 39.97], [120.18, 39.82], [120.03, 39.47], [119.5, 39.25], [118.97, 39.47], [118.82, 39.82], [118.75, 39.85], [118.5, 39.75], [118.25, 39.85], [118.0, 39.75], [117.47, 39.97], [117.32, 40.32], [117.25, 40.35], [117.0, 40.25], [116.75, 40.35], [116.68, 40.32], [116.53, 39.97], [116.0, 39.75], [115.47, 39.97], [115.32, 40.32], [115.25, 40.35], [115.0, 40.25], [114.47, 40.47], [114.25, 41.0], [114.35, 41.25], [114.32, 41.32], [114.25, 41.35], [114.0, 41.25], [113.47, 41.47]]]]}, "2021-05-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[113.47, 41.47], [113.25, 42.0], [113.47, 42.53], [114.0, 42.75], [114.25, 42.65], [114.5, 42.75], [114.75, 42.65], [115.0, 42.75], [115.25, 42.65], [115.5, 42.75], [115.75, 42.65], [116.0, 42.75], [116.25, 42.65], [116.5, 42.75], [117.03, 42.53], [117.18, 42.18], [117.25, 42.15], [117.5, 42.25], [117.75, 42.15], [118.0, 42.25], [118.53, 42.03], [118.68, 41.68], [118.75, 41.65], [119.0, 41.75], [119.25, 41.65], [119.5, 41.75], [119.75, 41.65], [120.0, 41.75], [120.25, 41.65], [120.5, 41.75], [121.03, 41.53], [121.25, 41.0], [121.03, 40.47], [120.68, 40.32], [120.53, 39.97], [120.18, 39.82], [120.03, 39.47], [119.5, 39.25], [118.97, 39.47], [118.82, 39.82], [118.75, 39.85], [118.5, 39.75], [118.25, 39.85], [118.0, 39.75], [117.47, 39.97], [117.32, 40.32], [117.25, 40.35], [117.0, 40.25], [116.75, 40.35], [116.68, 40.32], [116.53, 39.97], [116.0, 39.75], [115.47, 39.97], [115.32, 40.32], [115.25, 40.35], [115.0, 40.25], [114.47, 40.47], [114.25, 41.0], [114.35, 41.25], [114.32, 41.32], [114.25, 41.35], [114.0, 41.25], [113.47, 41.47]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -9.182675319667226}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -6.770276063337968}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [5.214365898718597, 4.978026056583701, 5.304764758147371]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [1.1116546688623998, -0.03836554734311903, 1.39208374425084]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-6.424798271234479, -6.936129285709027, -6.949900633070396]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-7.826444781369901, -9.182675319667226, -8.166720185991096]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.6524406031512646, -1.8047734189450255, -1.8280568845205136]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.9561517634555028, -2.47505458394782, -2.1855263767734066]}}