{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:07:34.868678", "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-04_to_2025-Sep-06_1.5_21.0"}, "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": 2025090000187}, "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 04 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 06 2025"}, "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": 181147.2627302776}, "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": ["Algeria", "Mali"]}, "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": 21.0}, "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": 1.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "1.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": -1.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 3.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 19.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 24.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-1.75, 20.0], [-1.65, 20.25], [-1.75, 20.5], [-1.65, 20.75], [-1.75, 21.0], [-1.53, 21.53], [-1.18, 21.68], [-1.03, 22.03], [-0.68, 22.18], [-0.54, 22.5], [-0.75, 23.0], [-0.53, 23.53], [-0.18, 23.68], [-0.15, 23.75], [-0.25, 24.0], [-0.03, 24.53], [0.32, 24.68], [0.47, 25.03], [1.0, 25.25], [1.25, 25.15], [1.5, 25.25], [2.03, 25.03], [2.25, 24.5], [2.15, 24.25], [2.25, 24.0], [2.15, 23.75], [2.18, 23.68], [2.53, 23.53], [2.68, 23.18], [3.03, 23.03], [3.18, 22.68], [3.53, 22.53], [3.75, 22.0], [3.65, 21.75], [3.75, 21.5], [3.65, 21.25], [3.68, 21.18], [4.03, 21.03], [4.25, 20.5], [4.03, 19.97], [3.68, 19.82], [3.53, 19.47], [3.0, 19.25], [2.75, 19.35], [2.5, 19.25], [2.25, 19.35], [2.0, 19.25], [1.75, 19.35], [1.5, 19.25], [1.25, 19.35], [1.0, 19.25], [0.75, 19.35], [0.5, 19.25], [0.25, 19.35], [0.13, 19.3], [0.25, 19.0], [0.03, 18.47], [-0.5, 18.25], [-0.75, 18.35], [-1.0, 18.25], [-1.53, 18.47], [-1.75, 19.0], [-1.65, 19.25], [-1.75, 19.5], [-1.65, 19.75], [-1.75, 20.0]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Sahara"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-09-04T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-1.75, 19.5], [-1.65, 19.75], [-1.75, 20.0], [-1.65, 20.25], [-1.75, 20.5], [-1.65, 20.75], [-1.75, 21.0], [-1.53, 21.53], [-1.18, 21.68], [-1.03, 22.03], [-0.68, 22.18], [-0.54, 22.5], [-0.75, 23.0], [-0.53, 23.53], [-0.18, 23.68], [-0.15, 23.75], [-0.25, 24.0], [-0.03, 24.53], [0.32, 24.68], [0.47, 25.03], [1.0, 25.25], [1.25, 25.15], [1.5, 25.25], [2.03, 25.03], [2.25, 24.5], [2.15, 24.25], [2.25, 24.0], [2.15, 23.75], [2.18, 23.68], [2.53, 23.53], [2.68, 23.18], [3.03, 23.03], [3.18, 22.68], [3.53, 22.53], [3.75, 22.0], [3.65, 21.75], [3.75, 21.5], [3.65, 21.25], [3.68, 21.18], [4.03, 21.03], [4.25, 20.5], [4.03, 19.97], [3.68, 19.82], [3.53, 19.47], [3.0, 19.25], [2.75, 19.35], [2.5, 19.25], [2.25, 19.35], [2.0, 19.25], [1.75, 19.35], [1.5, 19.25], [1.25, 19.35], [1.0, 19.25], [0.75, 19.35], [0.5, 19.25], [0.25, 19.35], [0.13, 19.3], [0.25, 19.0], [0.03, 18.47], [-0.5, 18.25], [-0.75, 18.35], [-1.0, 18.25], [-1.53, 18.47], [-1.75, 19.0], [-1.65, 19.25], [-1.75, 19.5]]]]}, "2025-09-05T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-1.75, 19.5], [-1.65, 19.75], [-1.75, 20.0], [-1.65, 20.25], [-1.75, 20.5], [-1.65, 20.75], [-1.75, 21.0], [-1.53, 21.53], [-1.18, 21.68], [-1.03, 22.03], [-0.68, 22.18], [-0.54, 22.5], [-0.75, 23.0], [-0.53, 23.53], [-0.18, 23.68], [-0.15, 23.75], [-0.25, 24.0], [-0.03, 24.53], [0.32, 24.68], [0.47, 25.03], [1.0, 25.25], [1.25, 25.15], [1.5, 25.25], [2.03, 25.03], [2.25, 24.5], [2.15, 24.25], [2.25, 24.0], [2.15, 23.75], [2.18, 23.68], [2.53, 23.53], [2.68, 23.18], [3.03, 23.03], [3.18, 22.68], [3.53, 22.53], [3.75, 22.0], [3.65, 21.75], [3.75, 21.5], [3.65, 21.25], [3.68, 21.18], [4.03, 21.03], [4.25, 20.5], [4.03, 19.97], [3.68, 19.82], [3.53, 19.47], [3.0, 19.25], [2.75, 19.35], [2.5, 19.25], [2.25, 19.35], [2.0, 19.25], [1.75, 19.35], [1.5, 19.25], [1.25, 19.35], [1.0, 19.25], [0.75, 19.35], [0.5, 19.25], [0.25, 19.35], [0.13, 19.3], [0.25, 19.0], [0.03, 18.47], [-0.5, 18.25], [-0.75, 18.35], [-1.0, 18.25], [-1.53, 18.47], [-1.75, 19.0], [-1.65, 19.25], [-1.75, 19.5]]]]}, "2025-09-06T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-1.75, 19.5], [-1.65, 19.75], [-1.75, 20.0], [-1.65, 20.25], [-1.75, 20.5], [-1.65, 20.75], [-1.75, 21.0], [-1.53, 21.53], [-1.18, 21.68], [-1.03, 22.03], [-0.68, 22.18], [-0.54, 22.5], [-0.75, 23.0], [-0.53, 23.53], [-0.18, 23.68], [-0.15, 23.75], [-0.25, 24.0], [-0.03, 24.53], [0.32, 24.68], [0.47, 25.03], [1.0, 25.25], [1.25, 25.15], [1.5, 25.25], [2.03, 25.03], [2.25, 24.5], [2.15, 24.25], [2.25, 24.0], [2.15, 23.75], [2.18, 23.68], [2.53, 23.53], [2.68, 23.18], [3.03, 23.03], [3.18, 22.68], [3.53, 22.53], [3.75, 22.0], [3.65, 21.75], [3.75, 21.5], [3.65, 21.25], [3.68, 21.18], [4.03, 21.03], [4.25, 20.5], [4.03, 19.97], [3.68, 19.82], [3.53, 19.47], [3.0, 19.25], [2.75, 19.35], [2.5, 19.25], [2.25, 19.35], [2.0, 19.25], [1.75, 19.35], [1.5, 19.25], [1.25, 19.35], [1.0, 19.25], [0.75, 19.35], [0.5, 19.25], [0.25, 19.35], [0.13, 19.3], [0.25, 19.0], [0.03, 18.47], [-0.5, 18.25], [-0.75, 18.35], [-1.0, 18.25], [-1.53, 18.47], [-1.75, 19.0], [-1.65, 19.25], [-1.75, 19.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -5.879899665152777}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.1297577822376725}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [32.13667485938885, 30.330088983691724, 32.02905514795083]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [29.666931406656943, 27.972353871663415, 30.072166697184286]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.4926338640480306, -4.2994083793996545, -2.597231103265333]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.5698619343481255, -5.879899665152777, -3.838911651089802]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.867228549817461, -3.2186446975224543, -1.9745123959521012]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.755457535611937, -4.489684802194473, -2.944847262365179]}}