{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:56:55.260582", "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-Sep-30_to_2025-Oct-03_346.0_19.0"}, "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": 2025090000665}, "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 30 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "October 03 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": 110803.6331728962}, "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": ["Mauritania"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Sahara"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Africa"]}, "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": 19.0}, "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": 346.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "346.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 344.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 347.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 17.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 21.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-09-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.15, 19.75], [-16.25, 20.0], [-16.15, 20.25], [-16.25, 20.5], [-16.03, 21.03], [-15.68, 21.18], [-15.53, 21.53], [-15.0, 21.75], [-14.75, 21.65], [-14.5, 21.75], [-14.25, 21.65], [-14.0, 21.75], [-13.75, 21.65], [-13.5, 21.75], [-12.97, 21.53], [-12.82, 21.18], [-12.47, 21.03], [-12.25, 20.5], [-12.47, 19.97], [-12.82, 19.82], [-12.85, 19.75], [-12.75, 19.5], [-12.85, 19.25], [-12.82, 19.18], [-12.75, 19.15], [-12.5, 19.25], [-11.97, 19.03], [-11.75, 18.5], [-11.85, 18.25], [-11.75, 18.0], [-11.97, 17.47], [-12.5, 17.25], [-12.75, 17.35], [-13.0, 17.25], [-13.5, 17.46], [-13.82, 17.32], [-13.97, 16.97], [-14.5, 16.75], [-14.75, 16.85], [-15.0, 16.75], [-15.53, 16.97], [-15.75, 17.5], [-15.65, 17.75], [-15.75, 18.0], [-15.65, 18.25], [-15.68, 18.32], [-16.03, 18.47], [-16.25, 19.0], [-16.15, 19.25], [-16.25, 19.5], [-16.15, 19.75]]]]}, "2025-10-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.15, 19.75], [-16.25, 20.0], [-16.15, 20.25], [-16.25, 20.5], [-16.03, 21.03], [-15.68, 21.18], [-15.53, 21.53], [-15.0, 21.75], [-14.75, 21.65], [-14.5, 21.75], [-14.25, 21.65], [-14.0, 21.75], [-13.75, 21.65], [-13.5, 21.75], [-12.97, 21.53], [-12.82, 21.18], [-12.47, 21.03], [-12.25, 20.5], [-12.47, 19.97], [-12.82, 19.82], [-12.85, 19.75], [-12.75, 19.5], [-12.85, 19.25], [-12.82, 19.18], [-12.75, 19.15], [-12.5, 19.25], [-11.97, 19.03], [-11.75, 18.5], [-11.85, 18.25], [-11.75, 18.0], [-11.97, 17.47], [-12.5, 17.25], [-12.75, 17.35], [-13.0, 17.25], [-13.5, 17.46], [-13.82, 17.32], [-13.97, 16.97], [-14.5, 16.75], [-14.75, 16.85], [-15.0, 16.75], [-15.53, 16.97], [-15.75, 17.5], [-15.65, 17.75], [-15.75, 18.0], [-15.65, 18.25], [-15.68, 18.32], [-16.03, 18.47], [-16.25, 19.0], [-16.15, 19.25], [-16.25, 19.5], [-16.15, 19.75]]]]}, "2025-10-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.15, 19.75], [-16.25, 20.0], [-16.15, 20.25], [-16.25, 20.5], [-16.03, 21.03], [-15.68, 21.18], [-15.53, 21.53], [-15.0, 21.75], [-14.75, 21.65], [-14.5, 21.75], [-14.25, 21.65], [-14.0, 21.75], [-13.75, 21.65], [-13.5, 21.75], [-12.97, 21.53], [-12.82, 21.18], [-12.47, 21.03], [-12.25, 20.5], [-12.47, 19.97], [-12.82, 19.82], [-12.85, 19.75], [-12.75, 19.5], [-12.85, 19.25], [-12.82, 19.18], [-12.75, 19.15], [-12.5, 19.25], [-11.97, 19.03], [-11.75, 18.5], [-11.85, 18.25], [-11.75, 18.0], [-11.97, 17.47], [-12.5, 17.25], [-12.75, 17.35], [-13.0, 17.25], [-13.5, 17.46], [-13.82, 17.32], [-13.97, 16.97], [-14.5, 16.75], [-14.75, 16.85], [-15.0, 16.75], [-15.53, 16.97], [-15.75, 17.5], [-15.65, 17.75], [-15.75, 18.0], [-15.65, 18.25], [-15.68, 18.32], [-16.03, 18.47], [-16.25, 19.0], [-16.15, 19.25], [-16.25, 19.5], [-16.15, 19.75]]]]}, "2025-10-03T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.25, 20.0], [-16.03, 20.53], [-15.68, 20.68], [-15.53, 21.03], [-15.0, 21.25], [-14.47, 21.03], [-14.32, 20.68], [-13.97, 20.53], [-13.82, 20.18], [-13.47, 20.03], [-13.25, 19.5], [-13.35, 19.25], [-13.25, 19.0], [-13.47, 18.47], [-13.82, 18.32], [-13.97, 17.97], [-14.5, 17.75], [-15.03, 17.97], [-15.25, 18.5], [-15.15, 18.75], [-15.18, 18.82], [-15.53, 18.97], [-15.68, 19.32], [-16.03, 19.47], [-16.25, 20.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -6.8590243036062475}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.58206594197213}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [27.644646882174243, 27.14218807555085, 28.960831678959437, 29.46565729777012]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [26.84007288614913, 25.118377939860068, 27.054104105631552, 28.352831776936853]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.01441201897808, -5.48458594481522, -3.6080488034306275, -3.210839965003481]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.8590243036062475, -6.639290712075763, -4.539578531560778, -3.5253348855009676]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-2.4359035296055693, -2.637369805829327, -1.7145584490233652, -1.49334019993587]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-3.3429415377004177, -3.213676600467373, -2.11288552217027, -1.6865906896602254]}}