{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:56:33.387480", "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-Aug-24_to_2025-Aug-27_14.5_13.0"}, "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": 2025080000732}, "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": "August 24 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 27 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": 75255.58017549897}, "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": ["Cameroon", "Chad", "Nigeria"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Central-Africa", "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": 13.0}, "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": 14.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "14.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 13.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 17.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 11.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 14.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-08-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[12.85, 13.25], [12.75, 13.5], [12.97, 14.03], [13.5, 14.25], [13.75, 14.15], [13.82, 14.18], [13.97, 14.53], [14.32, 14.68], [14.47, 15.03], [15.0, 15.25], [15.53, 15.03], [15.75, 14.5], [15.65, 14.25], [15.68, 14.18], [15.75, 14.15], [16.0, 14.25], [16.25, 14.15], [16.5, 14.25], [16.75, 14.15], [17.0, 14.25], [17.53, 14.03], [17.75, 13.5], [17.53, 12.97], [17.18, 12.82], [17.03, 12.47], [16.68, 12.32], [16.53, 11.97], [16.0, 11.75], [15.75, 11.85], [15.68, 11.82], [15.53, 11.47], [15.0, 11.25], [14.75, 11.35], [14.5, 11.25], [13.97, 11.47], [13.8, 11.88], [13.5, 11.75], [12.97, 11.97], [12.75, 12.5], [12.85, 12.75], [12.75, 13.0], [12.85, 13.25]]]]}, "2025-08-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[12.85, 13.25], [12.75, 13.5], [12.97, 14.03], [13.5, 14.25], [13.75, 14.15], [13.82, 14.18], [13.97, 14.53], [14.32, 14.68], [14.47, 15.03], [15.0, 15.25], [15.53, 15.03], [15.75, 14.5], [15.65, 14.25], [15.68, 14.18], [15.75, 14.15], [16.0, 14.25], [16.25, 14.15], [16.5, 14.25], [16.75, 14.15], [17.0, 14.25], [17.53, 14.03], [17.75, 13.5], [17.53, 12.97], [17.18, 12.82], [17.03, 12.47], [16.68, 12.32], [16.53, 11.97], [16.0, 11.75], [15.75, 11.85], [15.68, 11.82], [15.53, 11.47], [15.0, 11.25], [14.75, 11.35], [14.5, 11.25], [13.97, 11.47], [13.8, 11.88], [13.5, 11.75], [12.97, 11.97], [12.75, 12.5], [12.85, 12.75], [12.75, 13.0], [12.85, 13.25]]]]}, "2025-08-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[12.85, 13.25], [12.75, 13.5], [12.97, 14.03], [13.5, 14.25], [13.75, 14.15], [13.82, 14.18], [13.97, 14.53], [14.32, 14.68], [14.47, 15.03], [15.0, 15.25], [15.53, 15.03], [15.75, 14.5], [15.65, 14.25], [15.68, 14.18], [15.75, 14.15], [16.0, 14.25], [16.25, 14.15], [16.5, 14.25], [16.75, 14.15], [17.0, 14.25], [17.53, 14.03], [17.75, 13.5], [17.53, 12.97], [17.18, 12.82], [17.03, 12.47], [16.68, 12.32], [16.53, 11.97], [16.0, 11.75], [15.75, 11.85], [15.68, 11.82], [15.53, 11.47], [15.0, 11.25], [14.75, 11.35], [14.5, 11.25], [13.97, 11.47], [13.8, 11.88], [13.5, 11.75], [12.97, 11.97], [12.75, 12.5], [12.85, 12.75], [12.75, 13.0], [12.85, 13.25]]]]}, "2025-08-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[13.97, 12.47], [13.75, 13.0], [13.97, 13.53], [14.5, 13.75], [15.03, 13.53], [15.25, 13.0], [15.03, 12.47], [14.5, 12.25], [13.97, 12.47]]], [[[14.47, 13.97], [14.25, 14.5], [14.47, 15.03], [15.0, 15.25], [15.53, 15.03], [15.75, 14.5], [15.53, 13.97], [15.0, 13.75], [14.47, 13.97]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -3.4445725064909425}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.1484302778749256}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [25.67507441202804, 25.725574798583978, 25.56877675374352, 26.748262023925804]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [24.463625844319665, 24.837768809000693, 25.14581451416018, 26.55421091715499]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.116054998463073, -2.078941413057946, -2.2630311111185892, -1.9892216651895183]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-2.579820439165644, -2.9737802218812703, -3.4445725064909425, -2.3815105401295114]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5758139605191601, -1.52380865830167, -1.6302432550517307, -1.367812146509812]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.1323004176924383, -1.904930754210645, -2.2440712214081673, -1.4672777101167813]}}