{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:06:55.854721", "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-16_to_2025-Aug-19_29.5_-0.5"}, "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": 2025080000590}, "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 16 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 19 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": 64891.68783310503}, "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": ["Burundi", "Congo, The Democratic Republic of the", "Rwanda", "Uganda"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Africa", "Africa", "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": -0.5}, "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": 29.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "29.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 28.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 30.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -3.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 1.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[30.03, -3.53], [29.5, -3.75], [28.97, -3.53], [28.8, -3.12], [28.5, -3.25], [27.97, -3.03], [27.75, -2.5], [27.85, -2.25], [27.75, -2.0], [27.85, -1.75], [27.75, -1.5], [27.85, -1.25], [27.75, -1.0], [27.97, -0.47], [28.32, -0.32], [28.47, 0.03], [28.82, 0.18], [28.97, 0.53], [29.32, 0.68], [29.35, 0.75], [29.25, 1.0], [29.47, 1.53], [29.82, 1.68], [29.97, 2.03], [30.5, 2.25], [31.03, 2.03], [31.25, 1.5], [31.03, 0.97], [30.68, 0.82], [30.65, 0.75], [30.68, 0.68], [31.03, 0.53], [31.25, 0.0], [31.03, -0.53], [30.68, -0.68], [30.65, -0.75], [30.75, -1.0], [30.53, -1.53], [30.18, -1.68], [30.15, -1.75], [30.25, -2.0], [30.15, -2.25], [30.25, -2.5], [30.15, -2.75], [30.25, -3.0], [30.03, -3.53]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["S.Eastern-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-08-16T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[27.85, -1.75], [27.75, -1.5], [27.85, -1.25], [27.75, -1.0], [27.97, -0.47], [28.32, -0.32], [28.47, 0.03], [28.82, 0.18], [28.97, 0.53], [29.5, 0.75], [30.03, 0.53], [30.18, 0.18], [30.53, 0.03], [30.75, -0.5], [30.65, -0.75], [30.75, -1.0], [30.53, -1.53], [30.18, -1.68], [30.15, -1.75], [30.25, -2.0], [30.15, -2.25], [30.25, -2.5], [30.15, -2.75], [30.25, -3.0], [30.03, -3.53], [29.5, -3.75], [28.97, -3.53], [28.8, -3.12], [28.5, -3.25], [27.97, -3.03], [27.75, -2.5], [27.85, -2.25], [27.75, -2.0], [27.85, -1.75]]], [[[30.5, 0.75], [29.97, 0.97], [29.75, 1.5], [29.97, 2.03], [30.5, 2.25], [31.03, 2.03], [31.25, 1.5], [31.03, 0.97], [30.5, 0.75]]]]}, "2025-08-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[27.75, -2.0], [27.85, -1.75], [27.75, -1.5], [27.85, -1.25], [27.75, -1.0], [27.97, -0.47], [28.32, -0.32], [28.47, 0.03], [28.82, 0.18], [28.97, 0.53], [29.32, 0.68], [29.35, 0.75], [29.25, 1.0], [29.47, 1.53], [29.82, 1.68], [29.97, 2.03], [30.5, 2.25], [31.03, 2.03], [31.25, 1.5], [31.03, 0.97], [30.68, 0.82], [30.65, 0.75], [30.68, 0.68], [31.03, 0.53], [31.25, 0.0], [31.03, -0.53], [30.68, -0.68], [30.65, -0.75], [30.75, -1.0], [30.53, -1.53], [30.18, -1.68], [30.15, -1.75], [30.25, -2.0], [30.15, -2.25], [30.25, -2.5], [30.15, -2.75], [30.25, -3.0], [30.03, -3.53], [29.5, -3.75], [28.97, -3.53], [28.8, -3.12], [28.5, -3.25], [27.97, -3.03], [27.75, -2.5], [27.85, -2.25], [27.75, -2.0]]]]}, "2025-08-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[27.75, -2.0], [27.85, -1.75], [27.75, -1.5], [27.85, -1.25], [27.75, -1.0], [27.97, -0.47], [28.32, -0.32], [28.47, 0.03], [28.82, 0.18], [28.97, 0.53], [29.32, 0.68], [29.35, 0.75], [29.25, 1.0], [29.47, 1.53], [29.82, 1.68], [29.97, 2.03], [30.5, 2.25], [31.03, 2.03], [31.25, 1.5], [31.03, 0.97], [30.68, 0.82], [30.65, 0.75], [30.68, 0.68], [31.03, 0.53], [31.25, 0.0], [31.03, -0.53], [30.68, -0.68], [30.65, -0.75], [30.75, -1.0], [30.53, -1.53], [30.18, -1.68], [30.15, -1.75], [30.25, -2.0], [30.15, -2.25], [30.25, -2.5], [30.15, -2.75], [30.25, -3.0], [30.03, -3.53], [29.5, -3.75], [28.97, -3.53], [28.8, -3.12], [28.5, -3.25], [27.97, -3.03], [27.75, -2.5], [27.85, -2.25], [27.75, -2.0]]]]}, "2025-08-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[30.25, -2.5], [30.15, -2.75], [30.25, -3.0], [30.03, -3.53], [29.5, -3.75], [28.97, -3.53], [28.75, -3.0], [28.85, -2.75], [28.75, -2.5], [28.97, -1.97], [29.5, -1.75], [30.03, -1.97], [30.25, -2.5]]], [[[28.25, -0.5], [28.47, 0.03], [28.82, 0.18], [28.97, 0.53], [29.32, 0.68], [29.35, 0.75], [29.25, 1.0], [29.47, 1.53], [29.82, 1.68], [29.97, 2.03], [30.5, 2.25], [31.03, 2.03], [31.25, 1.5], [31.03, 0.97], [30.68, 0.82], [30.65, 0.75], [30.68, 0.68], [31.03, 0.53], [31.25, 0.0], [31.03, -0.53], [30.68, -0.68], [30.53, -1.03], [30.18, -1.18], [30.03, -1.53], [29.5, -1.75], [28.97, -1.53], [28.82, -1.18], [28.47, -1.03], [28.25, -0.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.138624022396016}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.1048822801558784}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [17.968572235107388, 18.258905755905914, 16.98205815875349, 19.24800855848531]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [14.133433278401696, 14.158436075846396, 12.721905008951865, 15.806792195638025]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-1.6957839787692528, -1.742423963825277, -3.0315038768450466, -1.6630609413772202]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-2.455447991078188, -2.3662032447740557, -4.138624022396016, -2.09103171058581]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.6517865066651578, -1.6741678565023326, -2.958360930675015, -1.6652015986305813]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.262127246593082, -2.088628099303858, -3.6550731335139015, -2.0673745006450757]}}