{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:05:10.220211", "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-May-31_to_2025-Jun-02_16.5_25.5"}, "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": 2025050000780}, "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": "May 31 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "June 02 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 3}, "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": 89247.8935694017}, "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": ["Libya"]}, "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": 25.5}, "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": 16.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "16.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 15.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 19.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 24.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 27.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[15.32, 26.18], [15.47, 26.53], [15.82, 26.68], [15.97, 27.03], [16.32, 27.18], [16.47, 27.53], [17.0, 27.75], [17.25, 27.65], [17.5, 27.75], [18.03, 27.53], [18.18, 27.18], [18.53, 27.03], [18.68, 26.68], [19.03, 26.53], [19.18, 26.18], [19.53, 26.03], [19.75, 25.5], [19.53, 24.97], [19.18, 24.82], [19.03, 24.47], [18.68, 24.32], [18.53, 23.97], [18.0, 23.75], [17.75, 23.85], [17.68, 23.82], [17.53, 23.47], [17.0, 23.25], [16.47, 23.47], [16.32, 23.82], [15.97, 23.97], [15.82, 24.32], [15.75, 24.35], [15.5, 24.25], [14.97, 24.47], [14.75, 25.0], [14.85, 25.25], [14.75, 25.5], [14.97, 26.03], [15.32, 26.18]]]]}}, "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": {"2025-05-31T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[14.75, 25.5], [14.97, 26.03], [15.32, 26.18], [15.47, 26.53], [15.82, 26.68], [15.97, 27.03], [16.32, 27.18], [16.47, 27.53], [17.0, 27.75], [17.25, 27.65], [17.5, 27.75], [18.03, 27.53], [18.18, 27.18], [18.53, 27.03], [18.68, 26.68], [19.03, 26.53], [19.18, 26.18], [19.53, 26.03], [19.75, 25.5], [19.53, 24.97], [19.18, 24.82], [19.03, 24.47], [18.68, 24.32], [18.53, 23.97], [18.0, 23.75], [17.75, 23.85], [17.68, 23.82], [17.53, 23.47], [17.0, 23.25], [16.47, 23.47], [16.32, 23.82], [15.97, 23.97], [15.82, 24.32], [15.75, 24.35], [15.5, 24.25], [14.97, 24.47], [14.75, 25.0], [14.85, 25.25], [14.75, 25.5]]]]}, "2025-06-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[14.75, 25.5], [14.97, 26.03], [15.32, 26.18], [15.47, 26.53], [15.82, 26.68], [15.97, 27.03], [16.32, 27.18], [16.47, 27.53], [17.0, 27.75], [17.25, 27.65], [17.5, 27.75], [18.03, 27.53], [18.18, 27.18], [18.53, 27.03], [18.68, 26.68], [19.03, 26.53], [19.18, 26.18], [19.53, 26.03], [19.75, 25.5], [19.53, 24.97], [19.18, 24.82], [19.03, 24.47], [18.68, 24.32], [18.53, 23.97], [18.0, 23.75], [17.75, 23.85], [17.68, 23.82], [17.53, 23.47], [17.0, 23.25], [16.47, 23.47], [16.32, 23.82], [15.97, 23.97], [15.82, 24.32], [15.75, 24.35], [15.5, 24.25], [14.97, 24.47], [14.75, 25.0], [14.85, 25.25], [14.75, 25.5]]]]}, "2025-06-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[14.75, 25.5], [14.97, 26.03], [15.32, 26.18], [15.47, 26.53], [15.82, 26.68], [15.97, 27.03], [16.32, 27.18], [16.47, 27.53], [17.0, 27.75], [17.25, 27.65], [17.5, 27.75], [18.03, 27.53], [18.18, 27.18], [18.53, 27.03], [18.68, 26.68], [19.03, 26.53], [19.18, 26.18], [19.53, 26.03], [19.75, 25.5], [19.53, 24.97], [19.18, 24.82], [19.03, 24.47], [18.68, 24.32], [18.53, 23.97], [18.0, 23.75], [17.75, 23.85], [17.68, 23.82], [17.53, 23.47], [17.0, 23.25], [16.47, 23.47], [16.32, 23.82], [15.97, 23.97], [15.82, 24.32], [15.75, 24.35], [15.5, 24.25], [14.97, 24.47], [14.75, 25.0], [14.85, 25.25], [14.75, 25.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -6.166100019397106}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.9235151127243455}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [25.535909271240314, 24.678493754069052, 26.27667643229171]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [22.148669179280603, 22.1179189046224, 23.879734293619833]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.714154625676281, -5.719768773186104, -4.3366219393106515]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.7489344920816166, -6.166100019397106, -5.21713269395849]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.6460446053703026, -2.090911941519099, -1.614019992773959]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.016660192779054, -2.344936604741959, -1.8923196380673148]}}