{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:09:20.729776", "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-Dec-18_to_2025-Dec-23_2.0_22.5"}, "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": 2025120000636}, "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": "December 18 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 23 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 6}, "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": 57402.41705870341}, "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": ["Algeria", "Mali"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Africa", "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": 22.5}, "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": 2.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "2.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 0.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 3.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 19.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 24.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-0.25, 21.0], [-0.03, 21.53], [0.32, 21.68], [0.47, 22.03], [0.82, 22.18], [0.97, 22.53], [1.32, 22.68], [1.35, 22.75], [1.25, 23.0], [1.47, 23.53], [1.82, 23.68], [1.97, 24.03], [2.32, 24.18], [2.47, 24.53], [3.0, 24.75], [3.25, 24.65], [3.5, 24.75], [4.03, 24.53], [4.25, 24.0], [4.03, 23.47], [3.68, 23.32], [3.53, 22.97], [3.18, 22.82], [3.15, 22.75], [3.25, 22.5], [3.03, 21.97], [2.68, 21.82], [2.53, 21.47], [2.18, 21.32], [2.03, 20.97], [1.68, 20.82], [1.65, 20.75], [1.75, 20.5], [1.65, 20.25], [1.75, 20.0], [1.53, 19.47], [1.18, 19.32], [1.03, 18.97], [0.5, 18.75], [0.25, 18.85], [0.0, 18.75], [-0.53, 18.97], [-0.75, 19.5], [-0.53, 20.03], [-0.18, 20.18], [-0.15, 20.25], [-0.25, 20.5], [-0.15, 20.75], [-0.25, 21.0]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Sahara"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-12-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-0.15, 20.25], [-0.25, 20.5], [-0.15, 20.75], [-0.25, 21.0], [-0.03, 21.53], [0.32, 21.68], [0.47, 22.03], [0.82, 22.18], [0.97, 22.53], [1.32, 22.68], [1.35, 22.75], [1.25, 23.0], [1.47, 23.53], [1.82, 23.68], [1.97, 24.03], [2.32, 24.18], [2.47, 24.53], [3.0, 24.75], [3.25, 24.65], [3.5, 24.75], [4.03, 24.53], [4.25, 24.0], [4.03, 23.47], [3.68, 23.32], [3.53, 22.97], [3.18, 22.82], [3.15, 22.75], [3.25, 22.5], [3.03, 21.97], [2.68, 21.82], [2.53, 21.47], [2.18, 21.32], [2.03, 20.97], [1.68, 20.82], [1.65, 20.75], [1.75, 20.5], [1.65, 20.25], [1.75, 20.0], [1.53, 19.47], [1.18, 19.32], [1.03, 18.97], [0.5, 18.75], [0.25, 18.85], [0.0, 18.75], [-0.53, 18.97], [-0.75, 19.5], [-0.53, 20.03], [-0.18, 20.18], [-0.15, 20.25]]]]}, "2025-12-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-0.15, 20.25], [-0.25, 20.5], [-0.15, 20.75], [-0.25, 21.0], [-0.03, 21.53], [0.32, 21.68], [0.47, 22.03], [0.82, 22.18], [0.97, 22.53], [1.32, 22.68], [1.35, 22.75], [1.25, 23.0], [1.47, 23.53], [1.82, 23.68], [1.97, 24.03], [2.32, 24.18], [2.47, 24.53], [3.0, 24.75], [3.25, 24.65], [3.5, 24.75], [4.03, 24.53], [4.25, 24.0], [4.03, 23.47], [3.68, 23.32], [3.53, 22.97], [3.18, 22.82], [3.15, 22.75], [3.25, 22.5], [3.03, 21.97], [2.68, 21.82], [2.53, 21.47], [2.18, 21.32], [2.03, 20.97], [1.68, 20.82], [1.65, 20.75], [1.75, 20.5], [1.65, 20.25], [1.75, 20.0], [1.53, 19.47], [1.18, 19.32], [1.03, 18.97], [0.5, 18.75], [0.25, 18.85], [0.0, 18.75], [-0.53, 18.97], [-0.75, 19.5], [-0.53, 20.03], [-0.18, 20.18], [-0.15, 20.25]]]]}, "2025-12-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-0.15, 20.25], [-0.25, 20.5], [-0.15, 20.75], [-0.25, 21.0], [-0.03, 21.53], [0.32, 21.68], [0.47, 22.03], [0.82, 22.18], [0.97, 22.53], [1.32, 22.68], [1.35, 22.75], [1.25, 23.0], [1.47, 23.53], [1.82, 23.68], [1.97, 24.03], [2.32, 24.18], [2.47, 24.53], [3.0, 24.75], [3.25, 24.65], [3.5, 24.75], [4.03, 24.53], [4.25, 24.0], [4.03, 23.47], [3.68, 23.32], [3.53, 22.97], [3.18, 22.82], [3.15, 22.75], [3.25, 22.5], [3.03, 21.97], [2.68, 21.82], [2.53, 21.47], [2.18, 21.32], [2.03, 20.97], [1.68, 20.82], [1.65, 20.75], [1.75, 20.5], [1.65, 20.25], [1.75, 20.0], [1.53, 19.47], [1.18, 19.32], [1.03, 18.97], [0.5, 18.75], [0.25, 18.85], [0.0, 18.75], [-0.53, 18.97], [-0.75, 19.5], [-0.53, 20.03], [-0.18, 20.18], [-0.15, 20.25]]]]}, "2025-12-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[1.35, 22.75], [1.25, 23.0], [1.47, 23.53], [1.82, 23.68], [1.97, 24.03], [2.32, 24.18], [2.47, 24.53], [3.0, 24.75], [3.53, 24.53], [3.75, 24.0], [3.65, 23.75], [3.75, 23.5], [3.53, 22.97], [3.18, 22.82], [3.03, 22.47], [2.68, 22.32], [2.53, 21.97], [2.18, 21.82], [2.03, 21.47], [1.5, 21.25], [0.97, 21.47], [0.75, 22.0], [0.97, 22.53], [1.32, 22.68], [1.35, 22.75]]]]}, "2025-12-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[1.35, 22.75], [1.25, 23.0], [1.47, 23.53], [1.82, 23.68], [1.97, 24.03], [2.32, 24.18], [2.47, 24.53], [3.0, 24.75], [3.53, 24.53], [3.75, 24.0], [3.65, 23.75], [3.75, 23.5], [3.53, 22.97], [3.18, 22.82], [3.03, 22.47], [2.68, 22.32], [2.53, 21.97], [2.18, 21.82], [2.03, 21.47], [1.5, 21.25], [0.97, 21.47], [0.75, 22.0], [0.97, 22.53], [1.32, 22.68], [1.35, 22.75]]]]}, "2025-12-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[2.25, 23.5], [2.47, 24.03], [3.0, 24.25], [3.53, 24.03], [3.75, 23.5], [3.53, 22.97], [3.0, 22.75], [2.57, 22.93], [2.75, 22.5], [2.53, 21.97], [2.0, 21.75], [1.47, 21.97], [1.25, 22.5], [1.47, 23.03], [2.0, 23.25], [2.43, 23.07], [2.25, 23.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.759413182632727}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.703246758236633}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [14.77226537068691, 14.156082407633448, 14.358461252848315, 13.574493299211781, 13.09278004964193, 13.240828450520837]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [13.146349843343103, 12.394892628987634, 12.220070139567099, 12.959851837158226, 12.335618591308616, 12.775496419270837]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.5138095788641777, -4.020269887336601, -3.72697426617448, -3.3235595825274067, -3.7586077712302477, -3.325253751087672]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.177663131794418, -4.759413182632727, -4.335380813352458, -3.665865123017568, -4.103972334642265, -3.426231607174543]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4097170486934276, -1.563800729402106, -1.4308164068244045, -1.311189725977491, -1.497480552618757, -1.3799950180424148]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.712313624329932, -1.8002289822781061, -1.7155428371116055, -1.4398330464451399, -1.6456514534231876, -1.3980224676022759]}}