{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:25:26.977884", "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": "2022-Dec-30_to_2023-Jan-05_43.0_-20.5"}, "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": 2022120001383}, "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 30 2022"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 05 2023"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 7}, "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": 283719.4955714769}, "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": ["Madagascar", "Mozambique"]}, "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": -20.5}, "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": 43.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "43.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 38.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 46.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -24.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -14.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[40.75, -21.0], [40.85, -20.75], [40.75, -20.5], [40.85, -20.25], [40.75, -20.0], [40.85, -19.75], [40.82, -19.68], [40.75, -19.65], [40.5, -19.75], [39.97, -19.53], [39.82, -19.18], [39.47, -19.03], [39.32, -18.68], [38.97, -18.53], [38.8, -18.12], [38.5, -18.25], [37.97, -18.03], [37.75, -17.5], [37.97, -16.97], [38.32, -16.82], [38.47, -16.47], [39.0, -16.25], [39.25, -16.35], [39.5, -16.25], [39.93, -16.43], [39.75, -16.0], [39.97, -15.47], [40.32, -15.32], [40.47, -14.97], [40.82, -14.82], [40.85, -14.75], [40.75, -14.5], [40.97, -13.97], [41.5, -13.75], [41.75, -13.85], [42.0, -13.75], [42.53, -13.97], [42.75, -14.5], [42.65, -14.75], [42.75, -15.0], [42.53, -15.53], [42.18, -15.68], [42.03, -16.03], [41.68, -16.18], [41.65, -16.25], [41.75, -16.5], [41.53, -17.03], [41.18, -17.18], [41.15, -17.25], [41.25, -17.5], [41.13, -17.8], [41.53, -17.97], [41.75, -18.5], [41.65, -18.75], [41.68, -18.82], [41.75, -18.85], [42.0, -18.75], [42.25, -18.85], [42.5, -18.75], [42.75, -18.85], [43.0, -18.75], [43.25, -18.85], [43.5, -18.75], [44.03, -18.97], [44.18, -19.32], [44.25, -19.35], [44.32, -19.32], [44.35, -19.25], [44.25, -19.0], [44.47, -18.47], [45.0, -18.25], [45.53, -18.47], [45.68, -18.82], [45.75, -18.85], [46.0, -18.75], [46.53, -18.97], [46.75, -19.5], [46.65, -19.75], [46.75, -20.0], [46.65, -20.25], [46.75, -20.5], [46.65, -20.75], [46.75, -21.0], [46.53, -21.53], [46.18, -21.68], [46.03, -22.03], [45.68, -22.18], [45.53, -22.53], [45.18, -22.68], [45.03, -23.03], [44.63, -23.2], [44.75, -23.5], [44.65, -23.75], [44.75, -24.0], [44.65, -24.25], [44.75, -24.5], [44.53, -25.03], [44.0, -25.25], [43.47, -25.03], [43.32, -24.68], [43.25, -24.65], [43.0, -24.75], [42.75, -24.65], [42.5, -24.75], [41.97, -24.53], [41.82, -24.18], [41.47, -24.03], [41.25, -23.5], [41.35, -23.25], [41.32, -23.18], [40.97, -23.03], [40.75, -22.5], [40.85, -22.25], [40.75, -22.0], [40.85, -21.75], [40.75, -21.5], [40.85, -21.25], [40.75, -21.0]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Southern-Africa", "Madagascar"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2022-12-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[40.25, -15.5], [40.47, -14.97], [40.82, -14.82], [40.85, -14.75], [40.75, -14.5], [40.97, -13.97], [41.5, -13.75], [41.75, -13.85], [42.0, -13.75], [42.53, -13.97], [42.75, -14.5], [42.65, -14.75], [42.75, -15.0], [42.53, -15.53], [42.18, -15.68], [42.03, -16.03], [41.68, -16.18], [41.53, -16.53], [41.0, -16.75], [40.47, -16.53], [40.25, -16.0], [40.35, -15.75], [40.25, -15.5]]]]}, "2022-12-31T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[39.0, -16.25], [39.53, -16.47], [39.75, -17.0], [39.53, -17.53], [39.18, -17.68], [39.03, -18.03], [38.5, -18.25], [37.97, -18.03], [37.75, -17.5], [37.97, -16.97], [38.32, -16.82], [38.47, -16.47], [39.0, -16.25]]], [[[40.82, -14.82], [40.85, -14.75], [40.75, -14.5], [40.97, -13.97], [41.5, -13.75], [41.75, -13.85], [42.0, -13.75], [42.53, -13.97], [42.75, -14.5], [42.65, -14.75], [42.75, -15.0], [42.53, -15.53], [42.18, -15.68], [42.03, -16.03], [41.68, -16.18], [41.53, -16.53], [41.0, -16.75], [40.75, -16.65], [40.5, -16.75], [39.97, -16.53], [39.75, -16.0], [39.97, -15.47], [40.32, -15.32], [40.47, -14.97], [40.82, -14.82]]]]}, "2023-01-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[44.46, -20.0], [44.25, -19.5], [44.35, -19.25], [44.25, -19.0], [44.47, -18.47], [45.0, -18.25], [45.53, -18.47], [45.68, -18.82], [45.75, -18.85], [46.0, -18.75], [46.53, -18.97], [46.75, -19.5], [46.65, -19.75], [46.75, -20.0], [46.53, -20.53], [46.18, -20.68], [46.03, -21.03], [45.68, -21.18], [45.53, -21.53], [45.0, -21.75], [44.47, -21.53], [44.25, -21.0], [44.35, -20.75], [44.25, -20.5], [44.46, -20.0]]], [[[39.0, -16.25], [39.25, -16.35], [39.5, -16.25], [39.93, -16.43], [39.75, -16.0], [39.97, -15.47], [40.32, -15.32], [40.47, -14.97], [40.82, -14.82], [40.85, -14.75], [40.75, -14.5], [40.97, -13.97], [41.5, -13.75], [41.75, -13.85], [42.0, -13.75], [42.53, -13.97], [42.75, -14.5], [42.65, -14.75], [42.75, -15.0], [42.53, -15.53], [42.18, -15.68], [42.03, -16.03], [41.68, -16.18], [41.65, -16.25], [41.75, -16.5], [41.53, -17.03], [41.18, -17.18], [41.15, -17.25], [41.25, -17.5], [41.03, -18.03], [40.68, -18.18], [40.65, -18.25], [40.68, -18.32], [41.03, -18.47], [41.25, -19.0], [41.03, -19.53], [40.5, -19.75], [39.97, -19.53], [39.82, -19.18], [39.47, -19.03], [39.32, -18.68], [38.97, -18.53], [38.8, -18.12], [38.5, -18.25], [37.97, -18.03], [37.75, -17.5], [37.97, -16.97], [38.32, -16.82], [38.47, -16.47], [39.0, -16.25]]]]}, "2023-01-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[38.47, -16.47], [39.0, -16.25], [39.25, -16.35], [39.5, -16.25], [39.93, -16.43], [39.75, -16.0], [39.97, -15.47], [40.5, -15.25], [40.75, -15.35], [41.0, -15.25], [41.53, -15.47], [41.75, -16.0], [41.65, -16.25], [41.75, -16.5], [41.53, -17.03], [41.18, -17.18], [41.15, -17.25], [41.25, -17.5], [41.13, -17.8], [41.53, -17.97], [41.75, -18.5], [41.65, -18.75], [41.68, -18.82], [41.75, -18.85], [42.0, -18.75], [42.25, -18.85], [42.5, -18.75], [42.75, -18.85], [43.0, -18.75], [43.25, -18.85], [43.5, -18.75], [44.03, -18.97], [44.18, -19.32], [44.25, -19.35], [44.32, -19.32], [44.35, -19.25], [44.25, -19.0], [44.47, -18.47], [45.0, -18.25], [45.53, -18.47], [45.68, -18.82], [45.75, -18.85], [46.0, -18.75], [46.53, -18.97], [46.75, -19.5], [46.65, -19.75], [46.75, -20.0], [46.65, -20.25], [46.75, -20.5], [46.65, -20.75], [46.75, -21.0], [46.53, -21.53], [46.18, -21.68], [46.03, -22.03], [45.68, -22.18], [45.53, -22.53], [45.0, -22.75], [44.5, -22.54], [44.0, -22.75], [43.47, -22.53], [43.25, -22.0], [43.35, -21.75], [43.32, -21.68], [43.25, -21.65], [43.0, -21.75], [42.75, -21.65], [42.68, -21.68], [42.53, -22.03], [42.0, -22.25], [41.75, -22.15], [41.5, -22.25], [40.97, -22.03], [40.75, -21.5], [40.85, -21.25], [40.75, -21.0], [40.85, -20.75], [40.75, -20.5], [40.85, -20.25], [40.75, -20.0], [40.85, -19.75], [40.82, -19.68], [40.75, -19.65], [40.5, -19.75], [39.97, -19.53], [39.82, -19.18], [39.47, -19.03], [39.32, -18.68], [38.97, -18.53], [38.8, -18.12], [38.5, -18.25], [37.97, -18.03], [37.75, -17.5], [37.97, -16.97], [38.32, -16.82], [38.47, -16.47]]]]}, "2023-01-03T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[38.47, -17.53], [38.25, -17.0], [38.47, -16.47], [39.0, -16.25], [39.25, -16.35], [39.5, -16.25], [40.0, -16.46], [40.32, -16.32], [40.47, -15.97], [41.0, -15.75], [41.53, -15.97], [41.75, -16.5], [41.53, -17.03], [41.18, -17.18], [41.15, -17.25], [41.25, -17.5], [41.13, -17.8], [41.53, -17.97], [41.75, -18.5], [41.65, -18.75], [41.68, -18.82], [41.75, -18.85], [42.0, -18.75], [42.25, -18.85], [42.5, -18.75], [42.75, -18.85], [43.0, -18.75], [43.25, -18.85], [43.5, -18.75], [44.03, -18.97], [44.18, -19.32], [44.25, -19.35], [44.32, -19.32], [44.35, -19.25], [44.25, -19.0], [44.47, -18.47], [45.0, -18.25], [45.53, -18.47], [45.68, -18.82], [45.75, -18.85], [46.0, -18.75], [46.53, -18.97], [46.75, -19.5], [46.65, -19.75], [46.75, -20.0], [46.65, -20.25], [46.75, -20.5], [46.65, -20.75], [46.75, -21.0], [46.53, -21.53], [46.18, -21.68], [46.03, -22.03], [45.68, -22.18], [45.53, -22.53], [45.18, -22.68], [45.03, -23.03], [44.63, -23.2], [44.75, -23.5], [44.65, -23.75], [44.75, -24.0], [44.65, -24.25], [44.75, -24.5], [44.53, -25.03], [44.0, -25.25], [43.47, -25.03], [43.32, -24.68], [43.25, -24.65], [43.0, -24.75], [42.75, -24.65], [42.5, -24.75], [41.97, -24.53], [41.82, -24.18], [41.47, -24.03], [41.25, -23.5], [41.35, -23.25], [41.32, -23.18], [40.97, -23.03], [40.75, -22.5], [40.85, -22.25], [40.75, -22.0], [40.85, -21.75], [40.75, -21.5], [40.85, -21.25], [40.75, -21.0], [40.85, -20.75], [40.75, -20.5], [40.85, -20.25], [40.75, -20.0], [40.85, -19.75], [40.82, -19.68], [40.75, -19.65], [40.5, -19.75], [39.97, -19.53], [39.82, -19.18], [39.47, -19.03], [39.32, -18.68], [38.97, -18.53], [38.75, -18.0], [38.85, -17.75], [38.82, -17.68], [38.47, -17.53]]]]}, "2023-01-04T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[40.25, -18.5], [40.47, -17.97], [41.0, -17.75], [41.53, -17.97], [41.75, -18.5], [41.65, -18.75], [41.68, -18.82], [41.75, -18.85], [42.0, -18.75], [42.25, -18.85], [42.5, -18.75], [42.75, -18.85], [43.0, -18.75], [43.25, -18.85], [43.5, -18.75], [44.03, -18.97], [44.18, -19.32], [44.25, -19.35], [44.5, -19.25], [45.03, -19.47], [45.18, -19.82], [45.25, -19.85], [45.32, -19.82], [45.35, -19.75], [45.25, -19.5], [45.47, -18.97], [46.0, -18.75], [46.53, -18.97], [46.75, -19.5], [46.65, -19.75], [46.75, -20.0], [46.65, -20.25], [46.75, -20.5], [46.65, -20.75], [46.75, -21.0], [46.53, -21.53], [46.18, -21.68], [46.03, -22.03], [45.68, -22.18], [45.53, -22.53], [45.18, -22.68], [45.03, -23.03], [44.63, -23.2], [44.75, -23.5], [44.65, -23.75], [44.75, -24.0], [44.65, -24.25], [44.75, -24.5], [44.53, -25.03], [44.0, -25.25], [43.47, -25.03], [43.32, -24.68], [43.25, -24.65], [43.0, -24.75], [42.75, -24.65], [42.5, -24.75], [41.97, -24.53], [41.82, -24.18], [41.47, -24.03], [41.25, -23.5], [41.35, -23.25], [41.32, -23.18], [40.97, -23.03], [40.75, -22.5], [40.85, -22.25], [40.75, -22.0], [40.85, -21.75], [40.75, -21.5], [40.85, -21.25], [40.75, -21.0], [40.85, -20.75], [40.75, -20.5], [40.85, -20.25], [40.75, -20.0], [40.85, -19.75], [40.82, -19.68], [40.47, -19.53], [40.25, -19.0], [40.35, -18.75], [40.25, -18.5]]]]}, "2023-01-05T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[40.75, -22.0], [40.85, -21.75], [40.75, -21.5], [40.85, -21.25], [40.75, -21.0], [40.85, -20.75], [40.75, -20.5], [40.85, -20.25], [40.75, -20.0], [40.97, -19.47], [41.5, -19.25], [41.75, -19.35], [41.82, -19.32], [41.97, -18.97], [42.5, -18.75], [42.75, -18.85], [43.0, -18.75], [43.25, -18.85], [43.5, -18.75], [44.03, -18.97], [44.18, -19.32], [44.53, -19.47], [44.75, -20.0], [44.65, -20.25], [44.75, -20.5], [44.65, -20.75], [44.75, -21.0], [44.63, -21.3], [45.03, -21.47], [45.25, -22.0], [45.15, -22.25], [45.25, -22.5], [45.03, -23.03], [44.63, -23.2], [44.75, -23.5], [44.65, -23.75], [44.75, -24.0], [44.65, -24.25], [44.75, -24.5], [44.53, -25.03], [44.0, -25.25], [43.47, -25.03], [43.32, -24.68], [43.25, -24.65], [43.0, -24.75], [42.75, -24.65], [42.5, -24.75], [41.97, -24.53], [41.82, -24.18], [41.47, -24.03], [41.25, -23.5], [41.35, -23.25], [41.32, -23.18], [40.97, -23.03], [40.75, -22.5], [40.85, -22.25], [40.75, -22.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -3.480099412583172}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -1.7662754944734875}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [26.511277473618975, 26.323791835790473, 25.67063536088648, 25.489348545583027, 25.074606179954742, 24.98127294168404, 25.609818190445765]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [26.363906201674524, 26.080821284693172, 22.843606870833298, 21.65890833123109, 21.93144360298686, 21.544519680391147, 22.645869705562347]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-0.9024642087463397, -1.0590231655743594, -1.3597208306051405, -1.6009422630365457, -2.024697594707158, -2.0168794626431708, -1.6480474819734892]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-1.073943239901439, -1.3393183680793186, -2.1184286353184802, -2.481112401198402, -3.397141223620679, -3.480099412583172, -2.963303491712054]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5391657008448878, -1.7791580577295385, -1.926357992588351, -1.7927726319532142, -2.0910495450833744, -1.9466733511286614, -1.6762356896811919]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.7537914938253123, -2.2327919324793264, -3.040020350957986, -2.302299815296347, -3.041044955788078, -2.3664479766894484, -2.181544324686364]}}