{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:19:22.359183", "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-Apr-13_to_2022-Apr-17_7.0_10.5"}, "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": 2022040000437}, "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": "April 13 2022"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 17 2022"}, "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": 66887.13227622707}, "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": ["Benin", "Nigeria"]}, "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": 10.5}, "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": 7.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "7.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 3.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 8.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 9.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 11.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[2.97, 10.53], [3.5, 10.75], [3.75, 10.65], [3.82, 10.68], [3.97, 11.03], [4.5, 11.25], [5.0, 11.04], [5.32, 11.18], [5.47, 11.53], [6.0, 11.75], [6.25, 11.65], [6.32, 11.68], [6.47, 12.03], [7.0, 12.25], [7.53, 12.03], [7.68, 11.68], [8.03, 11.53], [8.18, 11.18], [8.53, 11.03], [8.75, 10.5], [8.53, 9.97], [8.18, 9.82], [8.03, 9.47], [7.5, 9.25], [7.25, 9.35], [7.0, 9.25], [6.75, 9.35], [6.5, 9.25], [6.25, 9.35], [6.0, 9.25], [5.75, 9.35], [5.68, 9.32], [5.53, 8.97], [5.0, 8.75], [4.47, 8.97], [4.32, 9.32], [4.25, 9.35], [4.0, 9.25], [3.75, 9.35], [3.5, 9.25], [2.97, 9.47], [2.75, 10.0], [2.97, 10.53]]]]}}, "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": {"2022-04-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[6.25, 10.5], [6.47, 11.03], [7.0, 11.25], [7.25, 11.15], [7.5, 11.25], [7.75, 11.15], [8.0, 11.25], [8.53, 11.03], [8.75, 10.5], [8.53, 9.97], [8.18, 9.82], [8.03, 9.47], [7.5, 9.25], [7.25, 9.35], [7.0, 9.25], [6.47, 9.47], [6.25, 10.0], [6.35, 10.25], [6.25, 10.5]]]]}, "2022-04-14T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[3.5, 9.25], [2.97, 9.47], [2.75, 10.0], [2.97, 10.53], [3.5, 10.75], [3.75, 10.65], [3.82, 10.68], [3.97, 11.03], [4.5, 11.25], [5.0, 11.04], [5.32, 11.18], [5.47, 11.53], [6.0, 11.75], [6.25, 11.65], [6.5, 11.75], [6.75, 11.65], [7.0, 11.75], [7.25, 11.65], [7.5, 11.75], [8.03, 11.53], [8.18, 11.18], [8.53, 11.03], [8.75, 10.5], [8.53, 9.97], [8.18, 9.82], [8.03, 9.47], [7.5, 9.25], [7.25, 9.35], [7.0, 9.25], [6.75, 9.35], [6.5, 9.25], [6.25, 9.35], [6.0, 9.25], [5.75, 9.35], [5.68, 9.32], [5.53, 8.97], [5.0, 8.75], [4.47, 8.97], [4.32, 9.32], [4.25, 9.35], [4.0, 9.25], [3.75, 9.35], [3.5, 9.25]]]]}, "2022-04-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[3.5, 9.25], [2.97, 9.47], [2.75, 10.0], [2.97, 10.53], [3.5, 10.75], [3.75, 10.65], [3.82, 10.68], [3.97, 11.03], [4.5, 11.25], [5.0, 11.04], [5.32, 11.18], [5.47, 11.53], [6.0, 11.75], [6.25, 11.65], [6.32, 11.68], [6.47, 12.03], [7.0, 12.25], [7.53, 12.03], [7.68, 11.68], [8.03, 11.53], [8.18, 11.18], [8.53, 11.03], [8.75, 10.5], [8.53, 9.97], [8.18, 9.82], [8.03, 9.47], [7.5, 9.25], [7.25, 9.35], [7.0, 9.25], [6.75, 9.35], [6.5, 9.25], [6.25, 9.35], [6.0, 9.25], [5.75, 9.35], [5.68, 9.32], [5.53, 8.97], [5.0, 8.75], [4.47, 8.97], [4.32, 9.32], [4.25, 9.35], [4.0, 9.25], [3.75, 9.35], [3.5, 9.25]]]]}, "2022-04-16T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[3.5, 9.25], [2.97, 9.47], [2.75, 10.0], [2.97, 10.53], [3.5, 10.75], [3.75, 10.65], [3.82, 10.68], [3.97, 11.03], [4.5, 11.25], [5.0, 11.04], [5.32, 11.18], [5.47, 11.53], [6.0, 11.75], [6.25, 11.65], [6.32, 11.68], [6.47, 12.03], [7.0, 12.25], [7.53, 12.03], [7.68, 11.68], [8.03, 11.53], [8.18, 11.18], [8.53, 11.03], [8.75, 10.5], [8.53, 9.97], [8.0, 9.75], [7.75, 9.85], [7.5, 9.75], [7.25, 9.85], [7.18, 9.82], [7.03, 9.47], [6.5, 9.25], [6.25, 9.35], [6.0, 9.25], [5.75, 9.35], [5.68, 9.32], [5.53, 8.97], [5.0, 8.75], [4.47, 8.97], [4.32, 9.32], [4.25, 9.35], [4.0, 9.25], [3.75, 9.35], [3.5, 9.25]]]]}, "2022-04-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[6.47, 12.03], [7.0, 12.25], [7.53, 12.03], [7.75, 11.5], [7.53, 10.97], [7.0, 10.75], [6.47, 10.97], [6.25, 11.5], [6.47, 12.03]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.861742885737044}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.7575390268947957}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [27.74882010090846, 28.890642613603347, 27.235377281089427, 28.575706116219465, 28.75132554455098]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [27.09557085027393, 26.828372341408965, 24.796756874380037, 26.61704191305745, 28.75132554455098]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-1.7916815182902723, -2.2116444976986687, -3.775531371559251, -2.50439904527646, -1.7175797327847704]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-2.027491673392035, -3.043944436580034, -4.861742885737044, -3.2718652246038005, -1.7175797327847704]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.394779988709383, -1.6884992428688106, -2.7568242778065764, -1.7866673501260668, -1.2874927839475148]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5121330616132895, -2.372376335753785, -3.533536584028646, -2.1897675963961305, -1.2874927839475148]}}