{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 09:17:59.315773", "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": "2018-Sep-09_to_2018-Sep-11_139.5_44.5"}, "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": 2018090000415}, "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": "September 09 2018"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 11 2018"}, "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": 55771.00872331939}, "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"]}, "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": 44.5}, "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": 139.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "139.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 138.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 141.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 42.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 45.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2018-09-09T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[137.75, 43.5], [137.97, 44.03], [138.32, 44.18], [138.47, 44.53], [138.82, 44.68], [138.97, 45.03], [139.32, 45.18], [139.47, 45.53], [140.0, 45.75], [140.25, 45.65], [140.5, 45.75], [140.75, 45.65], [141.0, 45.75], [141.53, 45.53], [141.75, 45.0], [141.65, 44.75], [141.68, 44.68], [142.03, 44.53], [142.25, 44.0], [142.03, 43.47], [141.68, 43.32], [141.53, 42.97], [141.18, 42.82], [141.03, 42.47], [140.68, 42.32], [140.53, 41.97], [140.0, 41.75], [139.75, 41.85], [139.5, 41.75], [138.97, 41.97], [138.82, 42.32], [138.47, 42.47], [138.32, 42.82], [137.97, 42.97], [137.75, 43.5]]]]}, "2018-09-10T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[137.75, 43.5], [137.97, 44.03], [138.32, 44.18], [138.47, 44.53], [138.82, 44.68], [138.97, 45.03], [139.32, 45.18], [139.47, 45.53], [140.0, 45.75], [140.25, 45.65], [140.5, 45.75], [140.75, 45.65], [141.0, 45.75], [141.53, 45.53], [141.75, 45.0], [141.65, 44.75], [141.68, 44.68], [142.03, 44.53], [142.25, 44.0], [142.03, 43.47], [141.68, 43.32], [141.53, 42.97], [141.18, 42.82], [141.03, 42.47], [140.68, 42.32], [140.53, 41.97], [140.0, 41.75], [139.75, 41.85], [139.5, 41.75], [138.97, 41.97], [138.82, 42.32], [138.47, 42.47], [138.32, 42.82], [137.97, 42.97], [137.75, 43.5]]]]}, "2018-09-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[137.75, 43.5], [137.97, 44.03], [138.32, 44.18], [138.47, 44.53], [138.82, 44.68], [138.97, 45.03], [139.32, 45.18], [139.47, 45.53], [140.0, 45.75], [140.25, 45.65], [140.5, 45.75], [140.75, 45.65], [141.0, 45.75], [141.53, 45.53], [141.75, 45.0], [141.65, 44.75], [141.68, 44.68], [142.03, 44.53], [142.25, 44.0], [142.03, 43.47], [141.68, 43.32], [141.53, 42.97], [141.18, 42.82], [141.03, 42.47], [140.68, 42.32], [140.53, 41.97], [140.0, 41.75], [139.75, 41.85], [139.5, 41.75], [138.97, 41.97], [138.82, 42.32], [138.47, 42.47], [138.32, 42.82], [137.97, 42.97], [137.75, 43.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.3515092814977265}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.9979736370576977}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [17.02816289907662, 15.74504217633023, 16.947207468359863]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [15.504950795031448, 13.86310152693153, 14.016515844741491]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.7066370289289647, -3.825431685561441, -2.461852196682687]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-2.9244105795737028, -4.3515092814977265, -4.0580399949832895]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.641467365351553, -2.408286798500946, -1.4795132302040608]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.954691490356369, -2.85162279003459, -1.9976854568969817]}}