{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:06:54.471560", "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-12_to_2025-Aug-15_5.0_13.5"}, "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": 2025080000466}, "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 12 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 15 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": 140889.90349607615}, "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": ["Niger", "Nigeria"]}, "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": 13.5}, "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": 5.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "5.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 2.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 9.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 13.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 16.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[5.35, 15.25], [5.25, 15.5], [5.35, 15.75], [5.25, 16.0], [5.47, 16.53], [6.0, 16.75], [6.53, 16.53], [6.75, 16.0], [6.65, 15.75], [6.68, 15.68], [6.75, 15.65], [7.0, 15.75], [7.53, 15.53], [7.68, 15.18], [7.75, 15.15], [8.0, 15.25], [8.25, 15.15], [8.5, 15.25], [9.03, 15.03], [9.18, 14.68], [9.53, 14.53], [9.75, 14.0], [9.53, 13.47], [9.18, 13.32], [9.03, 12.97], [8.5, 12.75], [8.25, 12.85], [8.0, 12.75], [7.75, 12.85], [7.68, 12.82], [7.53, 12.47], [7.0, 12.25], [6.75, 12.35], [6.5, 12.25], [6.25, 12.35], [6.0, 12.25], [5.75, 12.35], [5.5, 12.25], [5.25, 12.35], [5.0, 12.25], [4.47, 12.47], [4.32, 12.82], [4.25, 12.85], [4.0, 12.75], [3.47, 12.97], [3.32, 13.32], [2.97, 13.47], [2.82, 13.82], [2.75, 13.85], [2.5, 13.75], [2.25, 13.85], [2.0, 13.75], [1.47, 13.97], [1.25, 14.5], [1.47, 15.03], [1.82, 15.18], [1.97, 15.53], [2.5, 15.75], [3.03, 15.53], [3.18, 15.18], [3.25, 15.15], [3.32, 15.18], [3.47, 15.53], [4.0, 15.75], [4.53, 15.53], [4.68, 15.18], [5.0, 15.04], [5.32, 15.18], [5.35, 15.25]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Sahara", "Western-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-08-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[1.97, 15.53], [2.5, 15.75], [3.03, 15.53], [3.18, 15.18], [3.25, 15.15], [3.32, 15.18], [3.47, 15.53], [4.0, 15.75], [4.53, 15.53], [4.68, 15.18], [5.0, 15.04], [5.32, 15.18], [5.35, 15.25], [5.25, 15.5], [5.35, 15.75], [5.25, 16.0], [5.47, 16.53], [6.0, 16.75], [6.53, 16.53], [6.75, 16.0], [6.65, 15.75], [6.68, 15.68], [7.03, 15.53], [7.25, 15.0], [7.15, 14.75], [7.25, 14.5], [7.15, 14.25], [7.25, 14.0], [7.15, 13.75], [7.25, 13.5], [7.15, 13.25], [7.25, 13.0], [7.03, 12.47], [6.5, 12.25], [6.25, 12.35], [6.0, 12.25], [5.75, 12.35], [5.5, 12.25], [5.25, 12.35], [5.0, 12.25], [4.47, 12.47], [4.32, 12.82], [4.25, 12.85], [4.0, 12.75], [3.47, 12.97], [3.32, 13.32], [2.97, 13.47], [2.82, 13.82], [2.75, 13.85], [2.5, 13.75], [2.25, 13.85], [2.0, 13.75], [1.47, 13.97], [1.25, 14.5], [1.47, 15.03], [1.82, 15.18], [1.97, 15.53]]]]}, "2025-08-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[1.97, 15.53], [2.5, 15.75], [3.03, 15.53], [3.18, 15.18], [3.25, 15.15], [3.32, 15.18], [3.47, 15.53], [4.0, 15.75], [4.53, 15.53], [4.68, 15.18], [5.0, 15.04], [5.32, 15.18], [5.35, 15.25], [5.25, 15.5], [5.35, 15.75], [5.25, 16.0], [5.47, 16.53], [6.0, 16.75], [6.53, 16.53], [6.75, 16.0], [6.65, 15.75], [6.68, 15.68], [6.75, 15.65], [7.0, 15.75], [7.53, 15.53], [7.68, 15.18], [7.75, 15.15], [8.0, 15.25], [8.25, 15.15], [8.5, 15.25], [9.03, 15.03], [9.18, 14.68], [9.53, 14.53], [9.75, 14.0], [9.53, 13.47], [9.18, 13.32], [9.03, 12.97], [8.5, 12.75], [8.25, 12.85], [8.0, 12.75], [7.75, 12.85], [7.68, 12.82], [7.53, 12.47], [7.0, 12.25], [6.75, 12.35], [6.5, 12.25], [6.25, 12.35], [6.0, 12.25], [5.75, 12.35], [5.5, 12.25], [5.25, 12.35], [5.0, 12.25], [4.47, 12.47], [4.32, 12.82], [4.25, 12.85], [4.0, 12.75], [3.47, 12.97], [3.32, 13.32], [2.97, 13.47], [2.82, 13.82], [2.75, 13.85], [2.5, 13.75], [2.25, 13.85], [2.0, 13.75], [1.47, 13.97], [1.25, 14.5], [1.47, 15.03], [1.82, 15.18], [1.97, 15.53]]]]}, "2025-08-14T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[1.97, 15.53], [2.5, 15.75], [3.03, 15.53], [3.18, 15.18], [3.25, 15.15], [3.32, 15.18], [3.47, 15.53], [4.0, 15.75], [4.53, 15.53], [4.68, 15.18], [5.0, 15.04], [5.32, 15.18], [5.35, 15.25], [5.25, 15.5], [5.35, 15.75], [5.25, 16.0], [5.47, 16.53], [6.0, 16.75], [6.53, 16.53], [6.75, 16.0], [6.65, 15.75], [6.68, 15.68], [6.75, 15.65], [7.0, 15.75], [7.53, 15.53], [7.68, 15.18], [7.75, 15.15], [8.0, 15.25], [8.25, 15.15], [8.5, 15.25], [9.03, 15.03], [9.18, 14.68], [9.53, 14.53], [9.75, 14.0], [9.53, 13.47], [9.18, 13.32], [9.03, 12.97], [8.5, 12.75], [8.25, 12.85], [8.0, 12.75], [7.75, 12.85], [7.68, 12.82], [7.53, 12.47], [7.0, 12.25], [6.75, 12.35], [6.5, 12.25], [6.25, 12.35], [6.0, 12.25], [5.75, 12.35], [5.5, 12.25], [5.25, 12.35], [5.0, 12.25], [4.47, 12.47], [4.32, 12.82], [4.25, 12.85], [4.0, 12.75], [3.47, 12.97], [3.32, 13.32], [2.97, 13.47], [2.82, 13.82], [2.75, 13.85], [2.5, 13.75], [2.25, 13.85], [2.0, 13.75], [1.47, 13.97], [1.25, 14.5], [1.47, 15.03], [1.82, 15.18], [1.97, 15.53]]]]}, "2025-08-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[3.25, 14.0], [3.47, 14.53], [4.0, 14.75], [4.25, 14.65], [4.5, 14.75], [4.75, 14.65], [4.82, 14.68], [4.97, 15.03], [5.32, 15.18], [5.47, 15.53], [6.0, 15.75], [6.25, 15.65], [6.5, 15.75], [6.75, 15.65], [7.0, 15.75], [7.53, 15.53], [7.68, 15.18], [7.75, 15.15], [8.0, 15.25], [8.25, 15.15], [8.5, 15.25], [9.03, 15.03], [9.18, 14.68], [9.53, 14.53], [9.75, 14.0], [9.53, 13.47], [9.18, 13.32], [9.03, 12.97], [8.5, 12.75], [8.25, 12.85], [8.0, 12.75], [7.75, 12.85], [7.68, 12.82], [7.53, 12.47], [7.0, 12.25], [6.75, 12.35], [6.5, 12.25], [6.25, 12.35], [6.0, 12.25], [5.75, 12.35], [5.5, 12.25], [5.25, 12.35], [5.0, 12.25], [4.47, 12.47], [4.32, 12.82], [4.25, 12.85], [4.0, 12.75], [3.47, 12.97], [3.25, 13.5], [3.35, 13.75], [3.25, 14.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.561751260922279}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.5592384664257914}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [25.168027496337913, 24.863934737401678, 25.65959631196148, 25.33673022234882]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [23.794932301839196, 23.067056274414085, 24.43644485473635, 24.113933817545615]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.8903976694362505, -3.036229815690993, -2.2181166487218826, -2.0874895086559175]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.064496105472756, -4.561751260922279, -2.7552346483524843, -2.4613601251747923]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-2.0227459057430273, -2.172696253472725, -1.6043298550413423, -1.6389937921028475]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.724511195913048, -3.1569066008644353, -2.053236924621909, -2.078335604849273]}}