{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:54:51.583201", "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-Aug-21_to_2023-Aug-25_10.5_31.0"}, "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": 2023080000586}, "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": "August 21 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 25 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": 159538.9391835702}, "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", "Libya", "Tunisia"]}, "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": 31.0}, "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": 10.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "10.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 7.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 13.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 28.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 32.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[6.85, 30.25], [6.75, 30.5], [6.97, 31.03], [7.32, 31.18], [7.47, 31.53], [7.82, 31.68], [7.97, 32.03], [8.5, 32.25], [8.75, 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"Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2023-08-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[9.25, 31.5], [9.35, 31.75], [9.25, 32.0], [9.47, 32.53], [10.0, 32.75], [10.25, 32.65], [10.5, 32.75], [10.75, 32.65], [11.0, 32.75], [11.25, 32.65], [11.5, 32.75], [11.75, 32.65], [12.0, 32.75], [12.25, 32.65], [12.5, 32.75], [12.75, 32.65], [13.0, 32.75], [13.53, 32.53], [13.75, 32.0], [13.53, 31.47], [13.0, 31.25], [12.75, 31.35], [12.68, 31.32], [12.53, 30.97], [12.18, 30.82], [12.03, 30.47], [11.5, 30.25], [11.25, 30.35], [11.0, 30.25], [10.75, 30.35], [10.5, 30.25], [10.25, 30.35], [10.0, 30.25], [9.47, 30.47], [9.25, 31.0], [9.35, 31.25], [9.25, 31.5]]]]}, "2023-08-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[6.75, 30.0], [6.85, 30.25], [6.75, 30.5], [6.97, 31.03], [7.32, 31.18], [7.47, 31.53], [7.82, 31.68], [7.97, 32.03], [8.5, 32.25], [8.75, 32.15], [9.0, 32.25], 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[11.85, 31.75]]]]}, "2023-08-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[7.5, 29.25], [6.97, 29.47], [6.75, 30.0], [6.97, 30.53], [7.5, 30.75], [7.75, 30.65], [8.0, 30.75], [8.53, 30.53], [8.75, 30.0], [8.53, 29.47], [8.0, 29.25], [7.75, 29.35], [7.5, 29.25]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -5.774612817253683}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.089909289578487}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [27.061175389859613, 27.349780523818254, 27.096434234613184, 28.83875360152058, 31.33221992535482]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [24.878869436657, 22.02820608508972, 22.367340400860428, 24.44814589682545, 31.129731484156707]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.1541979982770556, -4.598818909409908, -4.701101442017714, -3.1562635633552913, -2.247335333673391]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.9172636147473554, -5.774612817253683, -5.477377535047765, -3.9997642936497755, -2.273206571996866]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3704486548177954, -2.2558515252418685, -2.354360227455952, -1.6260803442059764, -1.2260214676486827]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5521252076226175, -2.754518937359455, -2.891954000478074, -2.1908784303499673, -1.2379801808988584]}}