{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:10:21.416367", "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": "2026-Feb-27_to_2026-Mar-03_353.0_8.0"}, "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": 2026020000684}, "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": "February 27 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "March 03 2026"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 5}, "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": 70430.27682502697}, "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": ["C\u00f4te d'Ivoire", "Guinea"]}, "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": 8.0}, "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": 353.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "353.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 350.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 355.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 6.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 9.25}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-8.18, 7.82], [-8.25, 7.85], [-8.5, 7.75], [-8.75, 7.85], [-9.0, 7.75], [-9.53, 7.97], [-9.68, 8.32], [-10.03, 8.47], [-10.25, 9.0], [-10.03, 9.53], [-9.5, 9.75], [-9.25, 9.65], [-9.0, 9.75], [-8.75, 9.65], [-8.5, 9.75], [-7.97, 9.53], [-7.82, 9.18], [-7.75, 9.15], [-7.5, 9.25], [-7.25, 9.15], [-7.0, 9.25], [-6.47, 9.03], [-6.32, 8.68], [-5.97, 8.53], [-5.82, 8.18], [-5.75, 8.15], [-5.5, 8.25], [-4.97, 8.03], [-4.82, 7.68], [-4.47, 7.53], [-4.25, 7.0], [-4.47, 6.47], [-4.82, 6.32], [-4.97, 5.97], [-5.5, 5.75], [-6.03, 5.97], [-6.18, 6.32], [-6.25, 6.35], [-6.5, 6.25], [-7.0, 6.46], [-7.5, 6.25], [-7.75, 6.35], [-8.0, 6.25], [-8.53, 6.47], [-8.75, 7.0], [-8.53, 7.53], [-8.18, 7.68], [-8.15, 7.75], [-8.18, 7.82]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Western-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-02-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-7.5, 6.75], [-8.029999999999973, 6.97], [-8.25, 7.5], [-8.029999999999973, 8.03], [-7.5, 8.25], [-7.25, 8.15], [-7.0, 8.25], [-6.470000000000027, 8.03], [-6.319999999999993, 7.68], [-6.25, 7.65], [-6.0, 7.75], [-5.75, 7.65], [-5.5, 7.75], [-5.25, 7.65], [-5.0, 7.75], [-4.470000000000027, 7.53], [-4.25, 7.0], [-4.470000000000027, 6.47], [-5.0, 6.25], [-5.25, 6.35], [-5.5, 6.25], [-5.75, 6.35], [-6.0, 6.25], [-6.25, 6.35], [-6.5, 6.25], [-7.029999999999973, 6.47], [-7.180000000000007, 6.82], [-7.25, 6.85], [-7.5, 6.75]]]]}, "2026-02-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-10.029999999999973, 8.47], [-10.25, 9.0], [-10.029999999999973, 9.53], [-9.5, 9.75], [-9.25, 9.65], [-9.0, 9.75], [-8.75, 9.65], [-8.5, 9.75], [-7.970000000000027, 9.53], [-7.819999999999993, 9.18], [-7.75, 9.15], [-7.5, 9.25], [-7.25, 9.15], [-7.0, 9.25], [-6.470000000000027, 9.03], [-6.319999999999993, 8.68], [-5.970000000000027, 8.53], [-5.819999999999993, 8.18], [-5.75, 8.15], [-5.5, 8.25], [-4.970000000000027, 8.03], [-4.819999999999993, 7.68], [-4.470000000000027, 7.53], [-4.25, 7.0], [-4.470000000000027, 6.47], [-4.819999999999993, 6.32], [-4.970000000000027, 5.97], [-5.5, 5.75], [-6.029999999999973, 5.97], [-6.180000000000007, 6.32], [-6.25, 6.35], [-6.5, 6.25], [-7.029999999999973, 6.47], [-7.180000000000007, 6.82], [-7.25, 6.85], [-7.5, 6.75], [-8.029999999999973, 6.97], [-8.25, 7.5], [-8.149999999999977, 7.75], [-8.180000000000007, 7.82], [-8.25, 7.85], [-8.5, 7.75], [-8.75, 7.85], [-9.0, 7.75], [-9.529999999999973, 7.97], [-9.680000000000007, 8.32], [-10.029999999999973, 8.47]]]]}, "2026-03-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-10.029999999999973, 8.47], [-10.25, 9.0], [-10.029999999999973, 9.53], [-9.5, 9.75], [-9.25, 9.65], [-9.0, 9.75], [-8.75, 9.65], [-8.5, 9.75], [-7.970000000000027, 9.53], [-7.819999999999993, 9.18], [-7.75, 9.15], [-7.5, 9.25], [-7.25, 9.15], [-7.0, 9.25], [-6.470000000000027, 9.03], [-6.319999999999993, 8.68], [-5.970000000000027, 8.53], 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9.03], [-7.5, 9.25], [-7.25, 9.15], [-7.0, 9.25], [-6.470000000000027, 9.03], [-6.25, 8.5], [-6.350000000000023, 8.25], [-6.25, 8.0], [-6.350000000000023, 7.75], [-6.25, 7.5], [-6.470000000000027, 6.97], [-6.819999999999993, 6.82], [-6.970000000000027, 6.47], [-7.5, 6.25], [-7.75, 6.35], [-8.0, 6.25], [-8.529999999999973, 6.47], [-8.75, 7.0], [-8.529999999999973, 7.53], [-8.180000000000007, 7.68], [-8.149999999999977, 7.75]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -3.1204751881357424}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -1.8850163610046031}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [26.880123392740927, 25.939925977918847, 25.933963090095006, 25.8384797248288, 25.720118459065816]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [25.234900410970056, 23.90967966715499, 23.76547775268557, 23.784949239095056, 24.16624476114913]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-1.4964557117121728, -1.9053515720187197, -1.8163913591941447, -1.921313890349673, -2.215998402399862]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-1.6687373480381211, -2.413281889301004, -2.6378339810509033, -2.6419021700183976, -3.1204751881357424]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3303931730728122, -1.6295930425047505, -1.526900466543889, -1.6643731771497117, -1.8686127864959636]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.472536633728871, -2.0230671744109903, -2.2029576035372767, -2.2807902118188808, -2.7206711714973224]}}