{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:09:24.512889", "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-27_to_2025-Dec-29_17.0_-15.0"}, "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": 2025120000859}, "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 27 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 29 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": 95392.16757707048}, "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": ["Angola"]}, "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": -15.0}, "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": 17.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "17.0\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": 18.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -17.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -13.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[14.75, -15.0], [14.85, -14.75], [14.75, -14.5], [14.97, -13.97], [15.32, -13.82], [15.35, -13.75], [15.25, -13.5], [15.47, -12.97], [16.0, -12.75], [16.53, -12.97], [16.68, -13.32], [16.75, -13.35], [17.0, -13.25], [17.53, -13.47], [17.68, -13.82], [18.03, -13.97], [18.18, -14.32], [18.53, -14.47], [18.75, -15.0], [18.65, -15.25], [18.75, -15.5], [18.65, -15.75], [18.75, -16.0], [18.65, -16.25], [18.75, -16.5], [18.65, -16.75], [18.75, -17.0], [18.53, -17.53], [18.0, -17.75], [17.47, -17.53], [17.32, -17.18], [17.25, -17.15], [17.0, -17.25], [16.75, -17.15], [16.5, -17.25], [15.97, -17.03], [15.82, -16.68], [15.75, -16.65], [15.5, -16.75], [14.97, -16.53], [14.75, -16.0], [14.85, -15.75], [14.75, -15.5], [14.85, -15.25], [14.75, -15.0]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.Southern-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-12-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[14.75, -15.5], [14.85, -15.25], [14.75, -15.0], [14.85, -14.75], [14.75, -14.5], [14.97, -13.97], [15.32, -13.82], [15.35, -13.75], [15.25, -13.5], [15.47, -12.97], [16.0, -12.75], [16.53, -12.97], [16.68, -13.32], [16.75, -13.35], [17.0, -13.25], [17.53, -13.47], [17.68, -13.82], [18.03, -13.97], [18.18, -14.32], [18.53, -14.47], [18.75, -15.0], [18.65, -15.25], [18.75, -15.5], [18.65, -15.75], [18.75, -16.0], [18.65, -16.25], [18.75, -16.5], [18.65, -16.75], [18.75, -17.0], [18.53, -17.53], [18.0, -17.75], [17.47, -17.53], [17.32, -17.18], [17.25, -17.15], [17.0, -17.25], [16.75, -17.15], [16.5, -17.25], [15.97, -17.03], [15.82, -16.68], [15.75, -16.65], [15.5, -16.75], [14.97, -16.53], [14.75, -16.0], [14.85, -15.75], [14.75, -15.5]]]]}, "2025-12-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[14.75, -15.5], [14.85, -15.25], [14.75, -15.0], [14.85, -14.75], [14.75, -14.5], [14.97, -13.97], [15.32, -13.82], [15.35, -13.75], [15.25, -13.5], [15.47, -12.97], [16.0, -12.75], [16.53, -12.97], [16.68, -13.32], [16.75, -13.35], [17.0, -13.25], [17.53, -13.47], [17.68, -13.82], [18.03, -13.97], [18.18, -14.32], [18.53, -14.47], [18.75, -15.0], [18.65, -15.25], [18.75, -15.5], [18.65, -15.75], [18.75, -16.0], [18.65, -16.25], [18.75, -16.5], [18.65, -16.75], [18.75, -17.0], [18.53, -17.53], [18.0, -17.75], [17.47, -17.53], [17.32, -17.18], [17.25, -17.15], [17.0, -17.25], [16.75, -17.15], [16.5, -17.25], [15.97, -17.03], [15.82, -16.68], [15.75, -16.65], [15.5, -16.75], [14.97, -16.53], [14.75, -16.0], [14.85, -15.75], [14.75, -15.5]]]]}, "2025-12-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[14.75, -15.5], [14.85, -15.25], [14.75, -15.0], [14.85, -14.75], [14.75, -14.5], [14.97, -13.97], [15.32, -13.82], [15.35, -13.75], [15.25, -13.5], [15.47, -12.97], [16.0, -12.75], [16.53, -12.97], [16.68, -13.32], [16.75, -13.35], [17.0, -13.25], [17.53, -13.47], [17.68, -13.82], [18.03, -13.97], [18.18, -14.32], [18.53, -14.47], [18.75, -15.0], [18.65, -15.25], [18.75, -15.5], [18.65, -15.75], [18.75, -16.0], [18.65, -16.25], [18.75, -16.5], [18.65, -16.75], [18.75, -17.0], [18.53, -17.53], [18.0, -17.75], [17.47, -17.53], [17.32, -17.18], [17.25, -17.15], [17.0, -17.25], [16.75, -17.15], [16.5, -17.25], [15.97, -17.03], [15.82, -16.68], [15.75, -16.65], [15.5, -16.75], [14.97, -16.53], [14.75, -16.0], [14.85, -15.75], [14.75, -15.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -6.0877557746379125}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.767280503683407}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [18.289868927001976, 17.73117090861001, 19.183384195963583]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [15.513450876871786, 15.796636199951195, 16.936552937825525]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.87708401266012, -4.440908713852467, -2.983848784537633]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.054332572359897, -6.0877557746379125, -4.861673865440082]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-2.27245290354852, -2.644082004155756, -1.6708379470109698]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-3.440156862408906, -3.4389820194935834, -2.275282780668088]}}