{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:56:51.196261", "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_357.0_17.0"}, "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": 2025090000122}, "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": 125200.8773460557}, "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": ["Burkina Faso", "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": 17.0}, "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": 357.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "357.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 355.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 360.75}, "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": 17.75}, "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": [[[[-2.53, 14.03], [-2.0, 14.25], [-1.75, 14.15], [-1.5, 14.25], [-1.25, 14.15], [-1.18, 14.18], [-1.03, 14.53], [-0.68, 14.68], [-0.53, 15.03], [0.0, 15.25], [0.53, 15.03], [0.68, 14.68], [1.03, 14.53], [1.25, 14.0], [1.15, 13.75], [1.25, 13.5], [1.03, 12.97], [0.5, 12.75], [0.25, 12.85], [0.0, 12.75], [-0.25, 12.85], [-0.5, 12.75], [-0.75, 12.85], [-1.0, 12.75], [-1.25, 12.85], [-1.32, 12.82], [-1.47, 12.47], [-2.0, 12.25], [-2.53, 12.47], [-2.75, 13.0], [-2.65, 13.25], [-2.75, 13.5], [-2.53, 14.03]]]]}, "2025-09-04T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-5.03, 17.03], [-4.5, 17.25], [-4.25, 17.15], [-4.18, 17.18], [-4.15, 17.25], [-4.25, 17.5], [-4.03, 18.03], [-3.5, 18.25], [-3.25, 18.15], [-3.0, 18.25], [-2.75, 18.15], [-2.5, 18.25], [-1.97, 18.03], [-1.82, 17.68], [-1.47, 17.53], [-1.25, 17.0], [-1.35, 16.75], [-1.25, 16.5], [-1.46, 16.0], [-1.32, 15.68], [-1.25, 15.65], [-1.0, 15.75], [-0.75, 15.65], [-0.5, 15.75], [0.03, 15.53], [0.18, 15.18], [0.53, 15.03], [0.68, 14.68], [1.03, 14.53], [1.25, 14.0], [1.15, 13.75], [1.25, 13.5], [1.03, 12.97], [0.5, 12.75], [0.25, 12.85], [0.0, 12.75], [-0.25, 12.85], [-0.5, 12.75], [-0.75, 12.85], [-1.0, 12.75], [-1.25, 12.85], [-1.32, 12.82], [-1.47, 12.47], [-2.0, 12.25], [-2.53, 12.47], [-2.75, 13.0], [-2.65, 13.25], [-2.75, 13.5], [-2.62, 13.8], [-2.75, 13.85], [-3.0, 13.75], [-3.53, 13.97], [-3.75, 14.5], [-3.65, 14.75], [-3.68, 14.82], [-4.03, 14.97], [-4.18, 15.32], [-4.25, 15.35], [-4.5, 15.25], [-5.03, 15.47], [-5.25, 16.0], [-5.15, 16.25], [-5.25, 16.5], [-5.03, 17.03]]]]}, "2025-09-05T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-5.03, 17.03], [-4.5, 17.25], [-4.25, 17.15], [-4.18, 17.18], [-4.15, 17.25], [-4.25, 17.5], [-4.03, 18.03], [-3.5, 18.25], [-3.25, 18.15], [-3.0, 18.25], [-2.75, 18.15], [-2.5, 18.25], [-1.97, 18.03], [-1.82, 17.68], [-1.47, 17.53], [-1.25, 17.0], [-1.35, 16.75], [-1.25, 16.5], [-1.46, 16.0], [-1.32, 15.68], [-1.25, 15.65], [-1.0, 15.75], [-0.75, 15.65], [-0.5, 15.75], [0.03, 15.53], [0.18, 15.18], [0.53, 15.03], [0.68, 14.68], [1.03, 14.53], [1.25, 14.0], [1.15, 13.75], [1.25, 13.5], [1.03, 12.97], [0.5, 12.75], [0.25, 12.85], [0.0, 12.75], [-0.25, 12.85], [-0.5, 12.75], [-0.75, 12.85], [-1.0, 12.75], [-1.25, 12.85], [-1.32, 12.82], [-1.47, 12.47], [-2.0, 12.25], [-2.53, 12.47], [-2.75, 13.0], [-2.65, 13.25], [-2.75, 13.5], [-2.62, 13.8], [-2.75, 13.85], [-3.0, 13.75], [-3.53, 13.97], [-3.75, 14.5], [-3.65, 14.75], [-3.68, 14.82], [-4.03, 14.97], [-4.18, 15.32], [-4.25, 15.35], [-4.5, 15.25], [-5.03, 15.47], [-5.25, 16.0], [-5.15, 16.25], [-5.25, 16.5], [-5.03, 17.03]]]]}, "2025-09-06T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-5.03, 17.03], [-4.5, 17.25], [-4.25, 17.15], [-4.18, 17.18], [-4.15, 17.25], [-4.25, 17.5], [-4.03, 18.03], [-3.5, 18.25], [-3.25, 18.15], [-3.0, 18.25], [-2.75, 18.15], [-2.5, 18.25], [-1.97, 18.03], [-1.82, 17.68], [-1.47, 17.53], [-1.25, 17.0], [-1.35, 16.75], [-1.25, 16.5], [-1.46, 16.0], [-1.32, 15.68], [-1.25, 15.65], [-1.0, 15.75], [-0.75, 15.65], [-0.5, 15.75], [0.03, 15.53], [0.25, 15.0], [0.03, 14.47], [-0.32, 14.32], [-0.47, 13.97], [-1.0, 13.75], [-1.25, 13.85], [-1.5, 13.75], [-1.75, 13.85], [-2.0, 13.75], [-2.25, 13.85], [-2.5, 13.75], [-2.75, 13.85], [-3.0, 13.75], [-3.53, 13.97], [-3.75, 14.5], [-3.65, 14.75], [-3.68, 14.82], [-4.03, 14.97], [-4.18, 15.32], [-4.25, 15.35], [-4.5, 15.25], [-5.03, 15.47], [-5.25, 16.0], [-5.15, 16.25], [-5.25, 16.5], [-5.03, 17.03]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.7108850716884945}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.0226441549230922}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [25.659568231756055, 26.254207804846374, 26.513076915438205, 27.72746376119636]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [25.072668965657556, 24.06162541707357, 24.941673533121786, 26.217674509684286]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.1269199419261997, -3.3691519098290494, -3.175057608365306, -2.664524012740597]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-2.6795442400775187, -4.2096026566734395, -4.7108850716884945, -3.8291972673060855]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.6082996587844767, -2.1715409161169723, -1.9866771336560007, -1.6172811600080559]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.0758280053618634, -2.8198357083140735, -2.8592062135457716, -2.1694185574061895]}}