{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:19:55.016740", "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": "2020-May-19_to_2020-May-22_141.0_39.0"}, "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": 2020050000503}, "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": "May 19 2020"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 22 2020"}, "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": 62361.37017473945}, "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": ["Japan"]}, "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": ["Japan Sea", "North Pacific Ocean"]}, "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": 39.0}, "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": 141.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "141.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 139.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 142.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 36.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 41.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2020-05-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[139.35, 37.75], [139.25, 38.0], [139.35, 38.25], [139.25, 38.5], [139.35, 38.75], [139.25, 39.0], [139.35, 39.25], [139.25, 39.5], [139.47, 40.03], [139.82, 40.18], [139.85, 40.25], [139.75, 40.5], [139.97, 41.03], [140.32, 41.18], [140.47, 41.53], [141.0, 41.75], [141.53, 41.53], [141.68, 41.18], [142.03, 41.03], [142.18, 40.68], [142.53, 40.53], [142.75, 40.0], [142.65, 39.75], [142.75, 39.5], [142.53, 38.97], [142.18, 38.82], [142.03, 38.47], [141.68, 38.32], [141.53, 37.97], [141.18, 37.82], [141.15, 37.75], [141.25, 37.5], [141.15, 37.25], [141.25, 37.0], [141.03, 36.47], [140.5, 36.25], [140.25, 36.35], [140.0, 36.25], [139.47, 36.47], [139.25, 37.0], [139.35, 37.25], [139.25, 37.5], [139.35, 37.75]]]]}, "2020-05-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[139.35, 37.75], [139.25, 38.0], [139.35, 38.25], [139.25, 38.5], [139.35, 38.75], [139.25, 39.0], [139.35, 39.25], [139.25, 39.5], [139.47, 40.03], [139.82, 40.18], [139.85, 40.25], [139.75, 40.5], [139.97, 41.03], [140.32, 41.18], [140.47, 41.53], [141.0, 41.75], [141.53, 41.53], [141.68, 41.18], [142.03, 41.03], [142.18, 40.68], [142.53, 40.53], [142.75, 40.0], [142.65, 39.75], [142.75, 39.5], [142.53, 38.97], [142.18, 38.82], [142.03, 38.47], [141.68, 38.32], [141.53, 37.97], [141.18, 37.82], [141.15, 37.75], [141.25, 37.5], [141.15, 37.25], [141.25, 37.0], [141.03, 36.47], [140.5, 36.25], [140.25, 36.35], [140.0, 36.25], [139.47, 36.47], [139.25, 37.0], [139.35, 37.25], [139.25, 37.5], [139.35, 37.75]]]]}, "2020-05-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[139.35, 37.75], [139.25, 38.0], [139.35, 38.25], [139.25, 38.5], [139.35, 38.75], [139.25, 39.0], [139.35, 39.25], [139.25, 39.5], [139.47, 40.03], [139.82, 40.18], [139.85, 40.25], [139.75, 40.5], [139.97, 41.03], [140.32, 41.18], [140.47, 41.53], [141.0, 41.75], [141.53, 41.53], [141.68, 41.18], [142.03, 41.03], [142.18, 40.68], [142.53, 40.53], [142.75, 40.0], [142.65, 39.75], [142.75, 39.5], [142.53, 38.97], [142.18, 38.82], [142.03, 38.47], [141.68, 38.32], [141.53, 37.97], [141.18, 37.82], [141.15, 37.75], [141.25, 37.5], [141.15, 37.25], [141.25, 37.0], [141.03, 36.47], [140.5, 36.25], [140.25, 36.35], [140.0, 36.25], [139.47, 36.47], [139.25, 37.0], [139.35, 37.25], [139.25, 37.5], [139.35, 37.75]]]]}, "2020-05-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[140.25, 39.5], [140.47, 40.03], [141.0, 40.25], [141.25, 40.15], [141.5, 40.25], [142.03, 40.03], [142.25, 39.5], [142.15, 39.25], [142.25, 39.0], [142.03, 38.47], [141.5, 38.25], [141.25, 38.35], [141.18, 38.32], [141.03, 37.97], [140.5, 37.75], [139.97, 37.97], [139.75, 38.5], [139.97, 39.03], [140.32, 39.18], [140.35, 39.25], [140.25, 39.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -8.468980682707468}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.5893679551506485}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [8.829948649689811, 7.63998799507624, 9.639458842011777, 11.18986567671584]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [4.913211591989182, 4.681123864379288, 7.212876128059918, 9.825017631624348]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.413881363688778, -6.776549584527284, -4.964043956092686, -3.5802385530952847]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-8.063979089946656, -8.468980682707468, -6.472087574730892, -3.8032152915538973]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-2.0724698785186835, -2.620177401887731, -1.958061732321598, -1.4132085521226436]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.584727301341616, -3.0583848130454645, -2.33220285517206, -1.4911670073588992]}}