{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:51:03.511509", "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": "2023-Feb-18_to_2023-Feb-22_45.5_3.5"}, "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": 2023020000732}, "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 18 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "February 22 2023"}, "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": 52418.09078890218}, "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": ["Somalia"]}, "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": ["Indian Ocean"]}, "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": 3.5}, "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": 45.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "45.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 45.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 47.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 3.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 5.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[45.25, 2.35], [45.0, 2.25], [44.47, 2.47], [44.25, 3.0], [44.47, 3.53], [44.82, 3.68], [44.85, 3.75], [44.75, 4.0], [44.85, 4.25], [44.75, 4.5], [44.97, 5.03], [45.5, 5.25], [45.75, 5.15], [45.82, 5.18], [45.97, 5.53], [46.5, 5.75], [46.75, 5.65], [47.0, 5.75], [47.25, 5.65], [47.5, 5.75], [48.03, 5.53], [48.25, 5.0], [48.03, 4.47], [47.68, 4.32], [47.53, 3.97], [47.18, 3.82], [47.15, 3.75], [47.25, 3.5], [47.15, 3.25], [47.25, 3.0], [47.03, 2.47], [46.5, 2.25], [46.25, 2.35], [46.0, 2.25], [45.75, 2.35], [45.5, 2.25], [45.25, 2.35]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.Eastern-Africa", "S.Eastern-Africa", "Equatorial.Indian-Ocean"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2023-02-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[46.5, 4.25], [45.97, 4.47], [45.75, 5.0], [45.97, 5.53], [46.5, 5.75], [46.75, 5.65], [47.0, 5.75], [47.25, 5.65], [47.5, 5.75], [48.03, 5.53], [48.25, 5.0], [48.03, 4.47], [47.5, 4.25], [47.25, 4.35], [47.0, 4.25], [46.75, 4.35], [46.5, 4.25]]]]}, "2023-02-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[44.85, 3.75], [44.75, 4.0], [44.85, 4.25], [44.75, 4.5], [44.97, 5.03], [45.5, 5.25], [45.75, 5.15], [45.82, 5.18], [45.97, 5.53], [46.5, 5.75], [46.75, 5.65], [47.0, 5.75], [47.25, 5.65], [47.5, 5.75], [48.03, 5.53], [48.25, 5.0], [48.03, 4.47], [47.68, 4.32], [47.53, 3.97], [47.18, 3.82], [47.15, 3.75], [47.25, 3.5], [47.15, 3.25], [47.25, 3.0], [47.03, 2.47], [46.5, 2.25], [46.25, 2.35], [46.0, 2.25], [45.75, 2.35], [45.5, 2.25], [45.25, 2.35], [45.0, 2.25], [44.47, 2.47], [44.25, 3.0], [44.47, 3.53], [44.82, 3.68], [44.85, 3.75]]]]}, "2023-02-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[44.85, 3.75], [44.75, 4.0], [44.85, 4.25], [44.75, 4.5], [44.97, 5.03], [45.5, 5.25], [45.75, 5.15], [45.82, 5.18], [45.97, 5.53], [46.5, 5.75], [46.75, 5.65], [47.0, 5.75], [47.25, 5.65], [47.5, 5.75], [48.03, 5.53], [48.25, 5.0], [48.03, 4.47], [47.68, 4.32], [47.53, 3.97], [47.18, 3.82], [47.15, 3.75], [47.25, 3.5], [47.15, 3.25], [47.25, 3.0], [47.03, 2.47], [46.5, 2.25], [46.25, 2.35], [46.0, 2.25], [45.75, 2.35], [45.5, 2.25], [45.25, 2.35], [45.0, 2.25], [44.47, 2.47], [44.25, 3.0], [44.47, 3.53], [44.82, 3.68], [44.85, 3.75]]]]}, "2023-02-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[44.85, 3.75], [44.75, 4.0], [44.85, 4.25], [44.75, 4.5], [44.97, 5.03], [45.5, 5.25], [45.75, 5.15], [45.82, 5.18], [45.97, 5.53], [46.5, 5.75], [46.75, 5.65], [47.0, 5.75], [47.25, 5.65], [47.5, 5.75], [48.03, 5.53], [48.25, 5.0], [48.03, 4.47], [47.68, 4.32], [47.53, 3.97], [47.18, 3.82], [47.15, 3.75], [47.25, 3.5], [47.15, 3.25], [47.25, 3.0], [47.03, 2.47], [46.5, 2.25], [46.25, 2.35], [46.0, 2.25], [45.75, 2.35], [45.5, 2.25], [45.25, 2.35], [45.0, 2.25], [44.47, 2.47], [44.25, 3.0], [44.47, 3.53], [44.82, 3.68], [44.85, 3.75]]]]}, "2023-02-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[44.97, 4.03], [45.5, 4.25], [46.03, 4.03], [46.25, 3.5], [46.15, 3.25], [46.25, 3.0], [46.03, 2.47], [45.5, 2.25], [45.25, 2.35], [45.0, 2.25], [44.47, 2.47], [44.25, 3.0], [44.47, 3.53], [44.82, 3.68], [44.97, 4.03]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -1.3403314435421407}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -1.0202398933042975}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [26.22507188623365, 26.673442597571125, 26.793949864160822, 26.541451554643345, 27.879610819643005]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [25.774049668104965, 25.71238941893506, 25.76240938374167, 25.60150739588613, 27.662369855469137]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-0.927079458409878, -0.9758484732729639, -0.9000430622938024, -1.216292628887489, -0.9351015824643317]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-1.0192990380539868, -1.1381141486225488, -1.0863457053766297, -1.3403314435421407, -0.9901839598098263]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3487869790805025, -1.5434883007116242, -1.36603600039997, -1.7800930113849929, -1.4349503827460124]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.3784681797078313, -1.9266161743850785, -1.6217867212302257, -2.05180725492524, -1.5174661333346247]}}