{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:56:51.188543", "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-03_to_2025-Sep-06_4.0_15.0"}, "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": 2025090000121}, "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 03 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 06 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": 107542.54819831625}, "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": ["Mali", "Niger"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Sahara", "Western-Africa"]}, "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": 15.0}, "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": 4.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "4.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 1.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 5.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 12.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 16.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-09-03T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[0.85, 14.25], [0.75, 14.5], [0.85, 14.75], [0.75, 15.0], [0.97, 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[3.97, 17.03], [4.5, 17.25], [4.75, 17.15], [5.0, 17.25], [5.53, 17.03], [5.75, 16.5], [5.53, 15.97], [5.18, 15.82], [5.15, 15.75], [5.25, 15.5], [5.15, 15.25], [5.25, 15.0], [5.15, 14.75], [5.25, 14.5], [5.03, 13.97], [4.5, 13.75], [4.25, 13.85], [4.0, 13.75], [3.75, 13.85], [3.68, 13.82], [3.53, 13.47], [3.18, 13.32], [3.15, 13.25], [3.25, 13.0], [3.03, 12.47], [2.5, 12.25], [2.25, 12.35], [2.0, 12.25], [1.47, 12.47], [1.32, 12.82], [0.97, 12.97], [0.75, 13.5], [0.85, 13.75], [0.75, 14.0], [0.85, 14.25]]]]}, "2025-09-05T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[0.85, 14.25], [0.75, 14.5], [0.85, 14.75], [0.75, 15.0], [0.97, 15.53], [1.32, 15.68], [1.47, 16.03], [1.82, 16.18], [1.97, 16.53], [2.5, 16.75], [2.75, 16.65], [3.0, 16.75], [3.25, 16.65], [3.5, 16.75], [3.75, 16.65], [3.82, 16.68], [3.97, 17.03], [4.5, 17.25], [4.75, 17.15], [5.0, 17.25], [5.53, 17.03], [5.75, 16.5], [5.53, 15.97], [5.18, 15.82], [5.15, 15.75], [5.25, 15.5], [5.15, 15.25], [5.25, 15.0], [5.15, 14.75], [5.25, 14.5], [5.03, 13.97], [4.5, 13.75], [4.25, 13.85], [4.0, 13.75], [3.75, 13.85], [3.68, 13.82], [3.53, 13.47], [3.18, 13.32], [3.15, 13.25], [3.25, 13.0], [3.03, 12.47], [2.5, 12.25], [2.25, 12.35], [2.0, 12.25], [1.47, 12.47], [1.32, 12.82], [0.97, 12.97], [0.75, 13.5], [0.85, 13.75], [0.75, 14.0], [0.85, 14.25]]]]}, "2025-09-06T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[4.0, 15.75], [4.53, 15.53], [4.68, 15.18], [5.03, 15.03], [5.25, 14.5], [5.03, 13.97], [4.5, 13.75], [4.0, 13.96], [3.5, 13.75], [2.97, 13.97], [2.75, 14.5], [2.97, 15.03], [3.32, 15.18], [3.47, 15.53], [4.0, 15.75]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -5.032894764483046}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.271801741881117}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [26.598688026710818, 27.238966454399986, 26.373585425482815, 27.4957235548232]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [24.023189798990927, 25.530294036865257, 23.976260121663415, 26.9467597961426]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.36288728094425, -2.8023632668968066, -3.7457012252057797, -2.125243173039299]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.009885231526027, -4.627236342270123, -5.032894764483046, -2.1485336374147437]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-2.133502267545528, -1.7253350654616555, -2.337975079264033, -1.3630461619252567]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.941957761699201, -2.604522763868295, -3.2214731782936905, -1.3838228061947666]}}