{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:07:38.795248", "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": "2025-Sep-19_to_2025-Sep-23_17.0_27.0"}, "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": 2025090000516}, "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": "September 19 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 23 2025"}, "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": 168950.59668330866}, "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": ["Libya"]}, "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": []}, "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": 27.0}, "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": 17.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "17.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 11.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 17.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 25.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 30.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[17.18, 26.32], [17.15, 26.25], [17.25, 26.0], [17.03, 25.47], [16.5, 25.25], [16.25, 25.35], [16.18, 25.32], [16.03, 24.97], [15.5, 24.75], [15.25, 24.85], [15.0, 24.75], [14.47, 24.97], [14.25, 25.5], [14.46, 26.0], [14.32, 26.32], [14.25, 26.35], [14.0, 26.25], [13.47, 26.47], [13.25, 27.0], [13.38, 27.3], [12.97, 27.47], [12.82, 27.82], [12.75, 27.85], [12.5, 27.75], [11.97, 27.97], [11.82, 28.32], [11.75, 28.35], [11.68, 28.32], [11.53, 27.97], [11.0, 27.75], [10.47, 27.97], [10.25, 28.5], [10.35, 28.75], [10.25, 29.0], [10.47, 29.53], [10.82, 29.68], [10.97, 30.03], [11.5, 30.25], [11.75, 30.15], [12.0, 30.25], [12.25, 30.15], [12.32, 30.18], [12.47, 30.53], [13.0, 30.75], [13.53, 30.53], [13.75, 30.0], [13.65, 29.75], [13.68, 29.68], [13.75, 29.65], [14.0, 29.75], [14.25, 29.65], [14.32, 29.68], [14.47, 30.03], [15.0, 30.25], [15.25, 30.15], [15.32, 30.18], [15.47, 30.53], [16.0, 30.75], [16.53, 30.53], [16.68, 30.18], [16.75, 30.15], [17.0, 30.25], [17.53, 30.03], [17.75, 29.5], [17.65, 29.25], [17.75, 29.0], [17.65, 28.75], [17.68, 28.68], [18.03, 28.53], [18.25, 28.0], [18.15, 27.75], [18.25, 27.5], [18.03, 26.97], [17.68, 26.82], [17.53, 26.47], [17.18, 26.32]], [[14.85, 27.75], [14.82, 27.82], [14.7, 27.88], [14.63, 27.7], [14.75, 27.65], [14.82, 27.68], [14.85, 27.75]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Mediterranean", "Sahara"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-09-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[10.25, 29.0], [10.47, 29.53], [10.82, 29.68], [10.97, 30.03], [11.5, 30.25], [11.75, 30.15], [12.0, 30.25], [12.25, 30.15], [12.32, 30.18], [12.47, 30.53], [13.0, 30.75], [13.53, 30.53], [13.75, 30.0], [13.65, 29.75], [13.68, 29.68], [13.75, 29.65], [14.0, 29.75], [14.25, 29.65], [14.5, 29.75], [14.75, 29.65], [15.0, 29.75], [15.53, 29.53], [15.75, 29.0], [15.53, 28.47], [15.0, 28.25], [14.75, 28.35], [14.68, 28.32], [14.53, 27.97], [14.0, 27.75], [13.75, 27.85], [13.5, 27.75], [13.25, 27.85], [13.0, 27.75], [12.75, 27.85], [12.5, 27.75], [11.97, 27.97], [11.82, 28.32], [11.75, 28.35], [11.68, 28.32], [11.53, 27.97], [11.0, 27.75], [10.47, 27.97], [10.25, 28.5], [10.35, 28.75], [10.25, 29.0]]]]}, "2025-09-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[10.25, 29.0], [10.47, 29.53], [10.82, 29.68], [10.97, 30.03], [11.5, 30.25], [11.75, 30.15], [12.0, 30.25], [12.25, 30.15], [12.32, 30.18], [12.47, 30.53], [13.0, 30.75], [13.53, 30.53], [13.75, 30.0], [13.65, 29.75], [13.68, 29.68], [13.75, 29.65], [14.0, 29.75], [14.25, 29.65], [14.32, 29.68], [14.47, 30.03], [15.0, 30.25], [15.25, 30.15], [15.32, 30.18], [15.47, 30.53], [16.0, 30.75], [16.53, 30.53], [16.68, 30.18], [16.75, 30.15], [17.0, 30.25], [17.53, 30.03], [17.75, 29.5], [17.65, 29.25], [17.75, 29.0], [17.65, 28.75], [17.68, 28.68], [18.03, 28.53], [18.25, 28.0], [18.15, 27.75], [18.25, 27.5], [18.03, 26.97], [17.68, 26.82], [17.53, 26.47], [17.0, 26.25], [16.47, 26.47], [16.32, 26.82], [16.25, 26.85], [16.0, 26.75], [15.75, 26.85], [15.68, 26.82], [15.53, 26.47], [15.0, 26.25], [14.75, 26.35], [14.5, 26.25], [14.25, 26.35], [14.0, 26.25], [13.47, 26.47], [13.25, 27.0], [13.38, 27.3], [12.97, 27.47], [12.82, 27.82], [12.75, 27.85], [12.5, 27.75], [11.97, 27.97], [11.82, 28.32], [11.75, 28.35], [11.68, 28.32], [11.53, 27.97], [11.0, 27.75], [10.47, 27.97], [10.25, 28.5], [10.35, 28.75], [10.25, 29.0]], [[14.85, 27.75], [14.82, 27.82], [14.7, 27.88], [14.63, 27.7], [14.75, 27.65], [14.82, 27.68], [14.85, 27.75]]]]}, "2025-09-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[10.25, 29.0], [10.47, 29.53], [10.82, 29.68], [10.97, 30.03], [11.5, 30.25], [11.75, 30.15], [12.0, 30.25], [12.25, 30.15], [12.32, 30.18], [12.47, 30.53], [13.0, 30.75], [13.53, 30.53], [13.75, 30.0], [13.65, 29.75], [13.68, 29.68], [13.75, 29.65], [14.0, 29.75], [14.25, 29.65], [14.32, 29.68], [14.47, 30.03], [15.0, 30.25], [15.25, 30.15], [15.32, 30.18], [15.47, 30.53], [16.0, 30.75], [16.53, 30.53], [16.68, 30.18], [16.75, 30.15], [17.0, 30.25], [17.53, 30.03], [17.75, 29.5], [17.65, 29.25], [17.75, 29.0], [17.65, 28.75], [17.68, 28.68], [18.03, 28.53], [18.25, 28.0], [18.15, 27.75], [18.25, 27.5], [18.03, 26.97], [17.68, 26.82], [17.53, 26.47], [17.18, 26.32], [17.15, 26.25], [17.25, 26.0], [17.03, 25.47], [16.5, 25.25], [16.25, 25.35], [16.18, 25.32], [16.03, 24.97], [15.5, 24.75], [15.25, 24.85], [15.0, 24.75], [14.47, 24.97], [14.25, 25.5], [14.46, 26.0], [14.32, 26.32], [14.25, 26.35], [14.0, 26.25], [13.47, 26.47], [13.25, 27.0], [13.38, 27.3], [12.97, 27.47], [12.82, 27.82], [12.75, 27.85], [12.5, 27.75], [11.97, 27.97], [11.82, 28.32], [11.75, 28.35], [11.68, 28.32], [11.53, 27.97], [11.0, 27.75], [10.47, 27.97], [10.25, 28.5], [10.35, 28.75], [10.25, 29.0]], [[14.85, 27.75], [14.82, 27.82], [14.7, 27.88], [14.63, 27.7], [14.75, 27.65], [14.82, 27.68], [14.85, 27.75]]]]}, "2025-09-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[12.75, 28.5], [12.97, 29.03], [13.5, 29.25], [13.75, 29.15], [13.82, 29.18], [13.97, 29.53], [14.32, 29.68], [14.47, 30.03], [15.0, 30.25], [15.25, 30.15], [15.32, 30.18], [15.47, 30.53], [16.0, 30.75], [16.53, 30.53], [16.68, 30.18], [16.75, 30.15], [17.0, 30.25], [17.53, 30.03], [17.75, 29.5], [17.65, 29.25], [17.75, 29.0], [17.65, 28.75], [17.68, 28.68], [18.03, 28.53], [18.25, 28.0], [18.15, 27.75], [18.25, 27.5], [18.03, 26.97], [17.68, 26.82], [17.53, 26.47], [17.18, 26.32], [17.15, 26.25], [17.25, 26.0], [17.03, 25.47], [16.5, 25.25], [16.25, 25.35], [16.18, 25.32], [16.03, 24.97], [15.5, 24.75], [15.25, 24.85], [15.0, 24.75], [14.47, 24.97], [14.25, 25.5], [14.46, 26.0], [14.32, 26.32], [14.25, 26.35], [14.0, 26.25], [13.47, 26.47], [13.25, 27.0], [13.38, 27.3], [12.97, 27.47], [12.75, 28.0], [12.85, 28.25], [12.75, 28.5]], [[14.85, 27.75], [14.82, 27.82], [14.7, 27.88], [14.63, 27.7], [14.75, 27.65], [14.82, 27.68], [14.85, 27.75]]]]}, "2025-09-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[14.25, 27.0], [14.47, 27.53], [15.0, 27.75], [15.25, 27.65], [15.5, 27.75], [15.75, 27.65], [16.0, 27.75], [16.25, 27.65], [16.5, 27.75], [16.75, 27.65], [17.0, 27.75], [17.53, 27.53], [17.75, 27.0], [17.53, 26.47], [17.18, 26.32], [17.15, 26.25], [17.25, 26.0], [17.03, 25.47], [16.5, 25.25], [16.25, 25.35], [16.18, 25.32], [16.03, 24.97], [15.5, 24.75], [15.25, 24.85], [15.0, 24.75], [14.47, 24.97], [14.25, 25.5], [14.46, 26.0], [14.25, 26.5], [14.35, 26.75], [14.25, 27.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -5.832325703083029}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.7393270704048303}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [25.31634667379825, 24.918838653564478, 24.411218959029043, 24.713520358471158, 26.581340499151338]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [24.20889053344729, 23.25511957804366, 21.762596384684286, 22.57106170654299, 25.656001027425134]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.2850480131680677, -3.491678605774433, -4.187942012030164, -3.9015661038972813, -2.7089245249836034]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.591041828005814, -4.305953920077343, -5.832325703083029, -5.030026689657518, -2.908979703967532]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.353089757039884, -1.3873966140235334, -1.7239515042944606, -1.628183181238845, -1.292575989643712]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.459006769247791, -1.5794878623405735, -2.2176921468106126, -2.1136985192105553, -1.3986266703038537]}}