{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:07:38.944734", "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-Sep-19_to_2025-Sep-24_30.5_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": 2025090000512}, "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": "September 19 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 24 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": 137790.87223157912}, "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": ["Sudan"]}, "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": 30.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "30.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 25.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 31.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 12.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 16.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[29.53, 11.97], [29.0, 11.75], [28.75, 11.85], [28.68, 11.82], [28.53, 11.47], [28.0, 11.25], [27.47, 11.47], [27.25, 12.0], [27.35, 12.25], [27.25, 12.5], [27.35, 12.75], [27.3, 12.87], [27.18, 12.82], [27.03, 12.47], [26.5, 12.25], [26.0, 12.46], [25.5, 12.25], [24.97, 12.47], [24.75, 13.0], [24.97, 13.53], [25.32, 13.68], [25.35, 13.75], [25.32, 13.82], [24.97, 13.97], [24.75, 14.5], [24.97, 15.03], [25.32, 15.18], [25.47, 15.53], [26.0, 15.75], [26.25, 15.65], [26.5, 15.75], [27.03, 15.53], [27.25, 15.0], [27.13, 14.7], [27.25, 14.65], [27.32, 14.68], [27.47, 15.03], [28.0, 15.25], [28.25, 15.15], [28.32, 15.18], [28.47, 15.53], [29.0, 15.75], [29.25, 15.65], [29.32, 15.68], [29.47, 16.03], [29.82, 16.18], [29.85, 16.25], [29.75, 16.5], [29.97, 17.03], [30.5, 17.25], [30.75, 17.15], [31.0, 17.25], [31.53, 17.03], [31.75, 16.5], [31.65, 16.25], [31.68, 16.18], [32.03, 16.03], [32.25, 15.5], [32.03, 14.97], [31.68, 14.82], [31.53, 14.47], [31.0, 14.25], [30.75, 14.35], [30.68, 14.32], [30.65, 14.25], [30.75, 14.0], [30.65, 13.75], [30.75, 13.5], [30.53, 12.97], [30.0, 12.75], [29.75, 12.85], [29.68, 12.82], [29.65, 12.75], [29.75, 12.5], [29.53, 11.97]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Sahara", "Central-Africa", "N.Eastern-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-09-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[27.25, 12.5], [27.47, 13.03], [28.0, 13.25], [28.25, 13.15], [28.5, 13.25], [28.75, 13.15], [29.0, 13.25], [29.53, 13.03], [29.75, 12.5], [29.53, 11.97], [29.0, 11.75], [28.75, 11.85], [28.68, 11.82], [28.53, 11.47], [28.0, 11.25], [27.47, 11.47], [27.25, 12.0], [27.35, 12.25], [27.25, 12.5]]]]}, "2025-09-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[27.25, 12.5], [27.35, 12.75], [27.25, 13.0], [27.35, 13.25], [27.25, 13.5], [27.35, 13.75], [27.25, 14.0], [27.35, 14.25], [27.25, 14.5], [27.47, 15.03], [28.0, 15.25], [28.25, 15.15], [28.5, 15.25], [28.75, 15.15], [29.0, 15.25], [29.25, 15.15], [29.5, 15.25], [30.03, 15.03], [30.25, 14.5], [30.15, 14.25], [30.18, 14.18], [30.53, 14.03], [30.75, 13.5], [30.53, 12.97], [30.0, 12.75], [29.75, 12.85], [29.68, 12.82], [29.65, 12.75], [29.75, 12.5], [29.53, 11.97], [29.0, 11.75], [28.75, 11.85], [28.68, 11.82], [28.53, 11.47], [28.0, 11.25], [27.47, 11.47], [27.25, 12.0], [27.35, 12.25], [27.25, 12.5]]]]}, "2025-09-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[25.75, 13.5], [25.85, 13.75], [25.75, 14.0], [25.97, 14.53], [26.5, 14.75], [26.75, 14.65], [27.0, 14.75], [27.25, 14.65], [27.32, 14.68], [27.47, 15.03], [28.0, 15.25], [28.25, 15.15], [28.32, 15.18], [28.47, 15.53], [29.0, 15.75], [29.25, 15.65], [29.32, 15.68], [29.47, 16.03], [29.82, 16.18], [29.85, 16.25], [29.75, 16.5], [29.97, 17.03], [30.5, 17.25], [30.75, 17.15], [31.0, 17.25], [31.53, 17.03], [31.75, 16.5], [31.65, 16.25], [31.68, 16.18], [32.03, 16.03], [32.25, 15.5], [32.03, 14.97], [31.68, 14.82], [31.53, 14.47], [31.0, 14.25], [30.75, 14.35], [30.68, 14.32], [30.65, 14.25], [30.75, 14.0], [30.65, 13.75], [30.75, 13.5], [30.53, 12.97], [30.0, 12.75], [29.75, 12.85], [29.68, 12.82], [29.65, 12.75], [29.75, 12.5], [29.53, 11.97], [29.0, 11.75], [28.75, 11.85], [28.68, 11.82], [28.53, 11.47], [28.0, 11.25], [27.47, 11.47], [27.25, 12.0], [27.35, 12.25], [27.25, 12.5], [27.35, 12.75], [27.25, 13.0], [27.03, 12.47], [26.5, 12.25], [25.97, 12.47], [25.75, 13.0], [25.85, 13.25], [25.75, 13.5]], [[27.35, 13.25], [27.32, 13.32], [27.25, 13.35], [27.18, 13.32], [27.15, 13.25], [27.25, 13.0], [27.35, 13.25]]]]}, "2025-09-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[25.35, 13.75], [25.32, 13.82], [24.97, 13.97], [24.75, 14.5], [24.97, 15.03], [25.32, 15.18], [25.47, 15.53], [26.0, 15.75], [26.25, 15.65], [26.5, 15.75], [27.03, 15.53], [27.25, 15.0], [27.13, 14.7], [27.25, 14.65], [27.32, 14.68], [27.47, 15.03], [28.0, 15.25], [28.25, 15.15], [28.32, 15.18], [28.47, 15.53], [29.0, 15.75], [29.25, 15.65], [29.32, 15.68], [29.47, 16.03], [29.82, 16.18], [29.85, 16.25], [29.75, 16.5], [29.97, 17.03], [30.5, 17.25], [30.75, 17.15], [31.0, 17.25], [31.53, 17.03], [31.75, 16.5], [31.65, 16.25], [31.68, 16.18], [32.03, 16.03], [32.25, 15.5], [32.03, 14.97], [31.68, 14.82], [31.53, 14.47], [31.0, 14.25], [30.75, 14.35], [30.68, 14.32], [30.65, 14.25], [30.75, 14.0], [30.65, 13.75], [30.75, 13.5], [30.53, 12.97], [30.0, 12.75], [29.75, 12.85], [29.68, 12.82], [29.65, 12.75], [29.75, 12.5], [29.53, 11.97], [29.0, 11.75], [28.5, 11.96], [28.0, 11.75], [27.47, 11.97], [27.25, 12.5], [27.35, 12.75], [27.3, 12.88], [27.18, 12.82], [27.03, 12.47], [26.5, 12.25], [26.0, 12.46], [25.5, 12.25], [24.97, 12.47], [24.75, 13.0], [24.97, 13.53], [25.32, 13.68], [25.35, 13.75]]]]}, "2025-09-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[25.35, 13.75], [25.32, 13.82], [24.97, 13.97], [24.75, 14.5], [24.97, 15.03], [25.32, 15.18], [25.47, 15.53], [26.0, 15.75], [26.25, 15.65], [26.5, 15.75], [27.03, 15.53], [27.25, 15.0], [27.13, 14.7], [27.25, 14.65], [27.32, 14.68], [27.47, 15.03], [28.0, 15.25], [28.25, 15.15], [28.32, 15.18], [28.47, 15.53], [29.0, 15.75], [29.25, 15.65], [29.32, 15.68], [29.47, 16.03], [29.82, 16.18], [29.85, 16.25], [29.75, 16.5], [29.97, 17.03], [30.5, 17.25], [30.75, 17.15], [31.0, 17.25], [31.53, 17.03], [31.75, 16.5], [31.65, 16.25], [31.68, 16.18], [32.03, 16.03], [32.25, 15.5], [32.03, 14.97], [31.68, 14.82], [31.53, 14.47], [31.0, 14.25], [30.75, 14.35], [30.68, 14.32], [30.65, 14.25], [30.75, 14.0], [30.65, 13.75], [30.75, 13.5], [30.53, 12.97], [30.0, 12.75], [29.75, 12.85], [29.68, 12.82], [29.65, 12.75], [29.75, 12.5], [29.53, 11.97], [29.0, 11.75], [28.5, 11.96], [28.0, 11.75], [27.47, 11.97], [27.25, 12.5], [27.35, 12.75], [27.3, 12.88], [27.18, 12.82], [27.03, 12.47], [26.5, 12.25], [26.0, 12.46], [25.5, 12.25], [24.97, 12.47], [24.75, 13.0], [24.97, 13.53], [25.32, 13.68], [25.35, 13.75]]]]}, "2025-09-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[25.32, 13.82], [24.97, 13.97], [24.75, 14.5], [24.97, 15.03], [25.32, 15.18], [25.47, 15.53], [26.0, 15.75], [26.25, 15.65], [26.5, 15.75], [27.03, 15.53], [27.25, 15.0], [27.13, 14.7], [27.25, 14.65], [27.5, 14.75], [28.03, 14.53], [28.25, 14.0], [28.03, 13.47], [27.68, 13.32], [27.53, 12.97], [27.18, 12.82], [27.03, 12.47], [26.5, 12.25], [26.0, 12.46], [25.5, 12.25], [24.97, 12.47], [24.75, 13.0], [24.97, 13.53], [25.32, 13.68], [25.35, 13.75], [25.32, 13.82]]], [[[29.75, 15.5], [29.97, 16.03], [30.5, 16.25], [31.03, 16.03], [31.25, 15.5], [31.15, 15.25], [31.25, 15.0], [31.03, 14.47], [30.68, 14.32], [30.53, 13.97], [30.0, 13.75], [29.47, 13.97], [29.25, 14.5], [29.47, 15.03], [29.82, 15.18], [29.85, 15.25], [29.75, 15.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.358680330395259}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.360012586286648}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [26.01119766235354, 27.47801996866866, 28.559323615358608, 28.044857279459677, 27.496164749607942, 28.201487477620503]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [25.504626210530603, 24.89663976033529, 25.712059275309286, 25.57692108154299, 24.908523813883505, 25.615672047932946]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-1.7727710518769157, -1.9971910288231545, -1.9186386868223173, -2.4431681616787184, -3.03523811750815, -1.8550358427345053]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-1.9837137720468263, -2.4655986827073093, -2.471557005850002, -4.104671200963878, -4.358680330395259, -2.917535308069205]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4498559751997968, -1.6943701284740833, -1.6305128473400934, -2.0783121987235504, -2.5097196848569685, -1.5684085420983493]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.640297123171554, -2.0955389197277112, -2.070870331857076, -3.3765845951015048, -3.529954566839613, -2.7111343882421948]}}