{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:10:46.462463", "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-Mar-16_to_2026-Mar-18_4.5_13.0"}, "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": 2026030000496}, "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": "March 16 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "March 18 2026"}, "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": 119412.11619925215}, "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": ["Mali", "Niger", "Nigeria"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["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": 13.0}, "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": 4.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "4.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 1.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 6.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 12.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 17.25}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[1.82, 15.18], [1.97, 15.53], [2.32, 15.68], [2.47, 16.03], [2.82, 16.18], [2.97, 16.53], [3.32, 16.68], [3.47, 17.03], [3.82, 17.18], [3.97, 17.53], [4.5, 17.75], [5.03, 17.53], [5.18, 17.18], [5.25, 17.15], [5.5, 17.25], [6.03, 17.03], [6.18, 16.68], [6.53, 16.53], [6.75, 16.0], [6.53, 15.47], [6.0, 15.25], [5.75, 15.35], [5.68, 15.32], [5.65, 15.25], [5.68, 15.18], [6.03, 15.03], [6.25, 14.5], [6.03, 13.97], [5.68, 13.82], [5.53, 13.47], [5.18, 13.32], [5.15, 13.25], [5.25, 13.0], [5.03, 12.47], [4.5, 12.25], [4.25, 12.35], [4.0, 12.25], [3.47, 12.47], [3.25, 13.0], [3.38, 13.3], [3.25, 13.35], [3.0, 13.25], [2.75, 13.35], [2.5, 13.25], [2.25, 13.35], [2.0, 13.25], [1.47, 13.47], [1.25, 14.0], [1.35, 14.25], [1.25, 14.5], [1.47, 15.03], [1.82, 15.18]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Sahara", "Western-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-03-16T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[1.25, 14.5], [1.47, 15.03], [1.82, 15.18], [1.97, 15.53], [2.32, 15.68], [2.47, 16.03], [2.82, 16.18], [2.97, 16.53], [3.32, 16.68], [3.47, 17.03], [3.82, 17.18], [3.97, 17.53], [4.5, 17.75], [5.03, 17.53], [5.18, 17.18], [5.25, 17.15], [5.5, 17.25], [6.03, 17.03], [6.18, 16.68], [6.53, 16.53], [6.75, 16.0], [6.53, 15.47], [6.0, 15.25], [5.75, 15.35], [5.68, 15.32], [5.65, 15.25], [5.68, 15.18], [6.03, 15.03], [6.25, 14.5], [6.03, 13.97], [5.68, 13.82], [5.53, 13.47], [5.18, 13.32], [5.15, 13.25], [5.25, 13.0], [5.03, 12.47], [4.5, 12.25], [4.25, 12.35], [4.0, 12.25], [3.47, 12.47], [3.25, 13.0], [3.38, 13.3], [3.25, 13.35], [3.0, 13.25], [2.75, 13.35], [2.5, 13.25], [2.25, 13.35], [2.0, 13.25], [1.47, 13.47], [1.25, 14.0], [1.35, 14.25], [1.25, 14.5]]]]}, "2026-03-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[1.25, 14.5], [1.47, 15.03], [1.82, 15.18], [1.97, 15.53], [2.32, 15.68], [2.47, 16.03], [2.82, 16.18], [2.97, 16.53], [3.32, 16.68], [3.47, 17.03], [3.82, 17.18], [3.97, 17.53], [4.5, 17.75], [5.03, 17.53], [5.18, 17.18], [5.25, 17.15], [5.5, 17.25], [6.03, 17.03], [6.18, 16.68], [6.53, 16.53], [6.75, 16.0], [6.53, 15.47], [6.0, 15.25], [5.75, 15.35], [5.68, 15.32], [5.65, 15.25], [5.68, 15.18], [6.03, 15.03], [6.25, 14.5], [6.03, 13.97], [5.68, 13.82], [5.53, 13.47], [5.18, 13.32], [5.15, 13.25], [5.25, 13.0], [5.03, 12.47], [4.5, 12.25], [4.25, 12.35], [4.0, 12.25], [3.47, 12.47], [3.25, 13.0], [3.38, 13.3], [3.25, 13.35], [3.0, 13.25], [2.75, 13.35], [2.5, 13.25], [2.25, 13.35], [2.0, 13.25], [1.47, 13.47], [1.25, 14.0], [1.35, 14.25], [1.25, 14.5]]]]}, "2026-03-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[1.25, 14.5], [1.47, 15.03], [1.82, 15.18], [1.97, 15.53], [2.32, 15.68], [2.47, 16.03], [2.82, 16.18], [2.97, 16.53], [3.32, 16.68], [3.47, 17.03], [3.82, 17.18], [3.97, 17.53], [4.5, 17.75], [5.03, 17.53], [5.18, 17.18], [5.25, 17.15], [5.5, 17.25], [6.03, 17.03], [6.18, 16.68], [6.53, 16.53], [6.75, 16.0], [6.53, 15.47], [6.0, 15.25], [5.75, 15.35], [5.68, 15.32], [5.65, 15.25], [5.68, 15.18], [6.03, 15.03], [6.25, 14.5], [6.03, 13.97], [5.68, 13.82], [5.53, 13.47], [5.18, 13.32], [5.15, 13.25], [5.25, 13.0], [5.03, 12.47], [4.5, 12.25], [4.25, 12.35], [4.0, 12.25], [3.47, 12.47], [3.25, 13.0], [3.38, 13.3], [3.25, 13.35], [3.0, 13.25], [2.75, 13.35], [2.5, 13.25], [2.25, 13.35], [2.0, 13.25], [1.47, 13.47], [1.25, 14.0], [1.35, 14.25], [1.25, 14.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.960138547696772}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.5870853932378552}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [26.328586069742926, 26.488348642985045, 27.55868657430011]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [23.940791066487634, 25.194966888427757, 25.39583867390951]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.9577429914064255, -3.9002556760156537, -2.9032575122914865]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.870883560550624, -4.960138547696772, -3.706400339673337]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.952888000689288, -1.993913201657539, -1.4460915602827913]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.325795973611258, -3.012514694959206, -1.8824512405595037]}}