{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-03-19 18:17:51.006602", "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": "2020-Aug-13_to_2020-Aug-17_25.0_22.0"}, "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": 2020080000491}, "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 13 2020"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 17 2020"}, "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": 242583.13037377963}, "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": ["Chad", "Egypt", "Libya", "Sudan"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Africa", "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": 22.0}, "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": 25.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "25.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 19.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 29.0}, "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": 24.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "Polygon", "coordinates": [[[18.25, 21.0], [18.47, 21.53], [19.0, 21.75], [19.53, 21.53], [19.698, 21.125], [19.823, 21.177], [19.97, 21.53], [20.5, 21.75], [20.75, 21.646], [21.0, 21.75], [21.53, 21.53], [21.75, 21.0], [21.646, 20.75], [21.698, 20.625], [21.823, 20.677], [21.97, 21.03], [22.323, 21.177], [22.354, 21.25], [22.25, 21.5], [22.47, 22.03], [23.0, 22.25], [23.25, 22.146], [23.5, 22.25], [23.75, 22.146], [24.0, 22.25], [24.25, 22.146], [24.323, 22.177], [24.354, 22.25], [24.25, 22.5], [24.47, 23.03], [24.875, 23.198], [24.75, 23.5], [24.854, 23.75], [24.75, 24.0], [24.97, 24.53], [25.5, 24.75], [25.75, 24.646], [26.0, 24.75], [26.5, 24.543], [27.0, 24.75], [27.53, 24.53], [27.75, 24.0], [27.53, 23.47], [27.177, 23.323], [27.146, 23.25], [27.177, 23.177], [27.53, 23.03], [27.75, 22.5], [27.646, 22.25], [27.677, 22.177], [28.03, 22.03], [28.177, 21.677], [28.25, 21.646], [28.5, 21.75], [28.75, 21.646], [29.0, 21.75], [29.53, 21.53], [29.75, 21.0], [29.53, 20.47], [29.177, 20.323], [29.03, 19.97], [28.677, 19.823], [28.53, 19.47], [28.177, 19.323], [28.03, 18.97], [27.5, 18.75], [26.97, 18.97], [26.823, 19.323], [26.75, 19.354], [26.5, 19.25], [26.25, 19.354], [26.177, 19.323], [26.146, 19.25], [26.25, 19.0], [26.03, 18.47], [25.5, 18.25], [24.97, 18.47], [24.823, 18.823], [24.47, 18.97], [24.25, 19.5], [24.354, 19.75], [24.323, 19.823], [24.25, 19.854], [24.0, 19.75], [23.75, 19.854], [23.677, 19.823], [23.53, 19.47], [23.0, 19.25], [22.75, 19.354], [22.677, 19.323], [22.53, 18.97], [22.0, 18.75], [21.75, 18.854], [21.677, 18.823], [21.53, 18.47], [21.0, 18.25], [20.75, 18.354], [20.5, 18.25], [20.25, 18.354], [20.0, 18.25], [19.47, 18.47], [19.323, 18.823], [18.97, 18.97], [18.823, 19.323], [18.47, 19.47], [18.25, 20.0], [18.354, 20.25], [18.25, 20.5], [18.354, 20.75], [18.25, 21.0]]]}}, "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": {"2020-08-13T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[24.353553390593273, 22.25], [24.25, 22.5], [24.46966991411009, 23.03033008588991], [24.875, 23.19822330470336], [24.75, 23.5], [24.853553390593273, 23.75], [24.75, 24.0], [24.96966991411009, 24.53033008588991], [25.5, 24.75], [25.75, 24.646446609406727], [26.0, 24.75], [26.5, 24.542893218813454], [27.0, 24.75], [27.53033008588991, 24.53033008588991], [27.75, 24.0], [27.53033008588991, 23.46966991411009], [27.17677669529664, 23.32322330470336], [27.146446609406727, 23.25], [27.25, 23.0], [27.03033008588991, 22.46966991411009], [26.5, 22.25], [26.25, 22.353553390593273], [26.17677669529664, 22.32322330470336], [26.146446609406727, 22.25], [26.25, 22.0], [26.03033008588991, 21.46966991411009], [25.5, 21.25], [25.25, 21.353553390593273], [25.0, 21.25], [24.46966991411009, 21.46966991411009], [24.25, 22.0], [24.353553390593273, 22.25]]]}, "2020-08-14T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[18.353553390593273, 20.25], [18.25, 20.5], [18.353553390593273, 20.75], [18.25, 21.0], [18.46966991411009, 21.53033008588991], [19.0, 21.75], [19.53033008588991, 21.53033008588991], [19.69822330470336, 21.125], [19.82322330470336, 21.17677669529664], [19.96966991411009, 21.53033008588991], [20.5, 21.75], [20.75, 21.646446609406727], [21.0, 21.75], [21.53033008588991, 21.53033008588991], [21.75, 21.0], [21.646446609406727, 20.75], [21.69822330470336, 20.625], [21.82322330470336, 20.67677669529664], [21.96966991411009, 21.03033008588991], [22.32322330470336, 21.17677669529664], [22.353553390593273, 21.25], [22.25, 21.5], [22.46966991411009, 22.03033008588991], [23.0, 22.25], [23.25, 22.146446609406727], [23.5, 22.25], [23.75, 22.146446609406727], [24.0, 22.25], [24.25, 22.146446609406727], [24.32322330470336, 22.17677669529664], [24.353553390593273, 22.25], [24.25, 22.5], [24.46966991411009, 23.03033008588991], [24.875, 23.19822330470336], [24.75, 23.5], [24.853553390593273, 23.75], [24.75, 24.0], [24.96966991411009, 24.53033008588991], [25.5, 24.75], [25.75, 24.646446609406727], [26.0, 24.75], [26.5, 24.542893218813454], [27.0, 24.75], [27.53033008588991, 24.53033008588991], [27.75, 24.0], [27.53033008588991, 23.46966991411009], [27.17677669529664, 23.32322330470336], [27.146446609406727, 23.25], [27.17677669529664, 23.17677669529664], [27.53033008588991, 23.03033008588991], [27.75, 22.5], [27.646446609406727, 22.25], [27.67677669529664, 22.17677669529664], [28.03033008588991, 22.03033008588991], [28.17677669529664, 21.67677669529664], [28.25, 21.646446609406727], [28.5, 21.75], [28.75, 21.646446609406727], [29.0, 21.75], [29.53033008588991, 21.53033008588991], [29.75, 21.0], [29.53033008588991, 20.46966991411009], [29.17677669529664, 20.32322330470336], [29.03033008588991, 19.96966991411009], [28.67677669529664, 19.82322330470336], [28.53033008588991, 19.46966991411009], [28.17677669529664, 19.32322330470336], [28.03033008588991, 18.96966991411009], [27.5, 18.75], [26.96966991411009, 18.96966991411009], [26.82322330470336, 19.32322330470336], [26.75, 19.353553390593273], [26.5, 19.25], [26.25, 19.353553390593273], [26.17677669529664, 19.32322330470336], [26.146446609406727, 19.25], [26.25, 19.0], [26.03033008588991, 18.46966991411009], [25.5, 18.25], [24.96966991411009, 18.46966991411009], [24.82322330470336, 18.82322330470336], [24.46966991411009, 18.96966991411009], [24.25, 19.5], [24.353553390593273, 19.75], [24.32322330470336, 19.82322330470336], [24.25, 19.853553390593273], [24.0, 19.75], [23.75, 19.853553390593273], [23.67677669529664, 19.82322330470336], [23.53033008588991, 19.46966991411009], [23.0, 19.25], [22.75, 19.353553390593273], [22.67677669529664, 19.32322330470336], [22.53033008588991, 18.96966991411009], [22.0, 18.75], [21.75, 18.853553390593273], [21.67677669529664, 18.82322330470336], [21.53033008588991, 18.46966991411009], [21.0, 18.25], [20.75, 18.353553390593273], [20.5, 18.25], [20.25, 18.353553390593273], [20.0, 18.25], [19.46966991411009, 18.46966991411009], [19.32322330470336, 18.82322330470336], [18.96966991411009, 18.96966991411009], [18.82322330470336, 19.32322330470336], [18.46966991411009, 19.46966991411009], [18.25, 20.0], [18.353553390593273, 20.25]]]}, "2020-08-15T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[18.353553390593273, 20.25], [18.25, 20.5], [18.353553390593273, 20.75], [18.25, 21.0], [18.46966991411009, 21.53033008588991], [19.0, 21.75], [19.53033008588991, 21.53033008588991], [19.69822330470336, 21.125], [19.82322330470336, 21.17677669529664], [19.96966991411009, 21.53033008588991], [20.5, 21.75], [20.75, 21.646446609406727], [21.0, 21.75], [21.53033008588991, 21.53033008588991], [21.75, 21.0], [21.646446609406727, 20.75], [21.69822330470336, 20.625], [21.82322330470336, 20.67677669529664], [21.96966991411009, 21.03033008588991], [22.32322330470336, 21.17677669529664], [22.353553390593273, 21.25], [22.25, 21.5], [22.46966991411009, 22.03033008588991], [23.0, 22.25], [23.25, 22.146446609406727], [23.5, 22.25], [23.75, 22.146446609406727], [24.0, 22.25], [24.25, 22.146446609406727], [24.32322330470336, 22.17677669529664], [24.353553390593273, 22.25], [24.25, 22.5], [24.46966991411009, 23.03033008588991], [24.875, 23.19822330470336], [24.75, 23.5], [24.853553390593273, 23.75], [24.75, 24.0], [24.96966991411009, 24.53033008588991], [25.5, 24.75], [25.75, 24.646446609406727], [26.0, 24.75], [26.5, 24.542893218813454], [27.0, 24.75], [27.53033008588991, 24.53033008588991], [27.75, 24.0], [27.53033008588991, 23.46966991411009], [27.17677669529664, 23.32322330470336], [27.146446609406727, 23.25], [27.17677669529664, 23.17677669529664], [27.53033008588991, 23.03033008588991], [27.75, 22.5], [27.646446609406727, 22.25], [27.67677669529664, 22.17677669529664], [28.03033008588991, 22.03033008588991], [28.17677669529664, 21.67677669529664], [28.25, 21.646446609406727], [28.5, 21.75], [28.75, 21.646446609406727], [29.0, 21.75], [29.53033008588991, 21.53033008588991], [29.75, 21.0], [29.53033008588991, 20.46966991411009], [29.17677669529664, 20.32322330470336], [29.03033008588991, 19.96966991411009], [28.67677669529664, 19.82322330470336], [28.53033008588991, 19.46966991411009], [28.17677669529664, 19.32322330470336], [28.03033008588991, 18.96966991411009], [27.5, 18.75], [26.96966991411009, 18.96966991411009], [26.82322330470336, 19.32322330470336], [26.75, 19.353553390593273], [26.5, 19.25], [26.25, 19.353553390593273], [26.17677669529664, 19.32322330470336], [26.146446609406727, 19.25], [26.25, 19.0], [26.03033008588991, 18.46966991411009], [25.5, 18.25], [24.96966991411009, 18.46966991411009], [24.82322330470336, 18.82322330470336], [24.46966991411009, 18.96966991411009], [24.25, 19.5], [24.353553390593273, 19.75], [24.32322330470336, 19.82322330470336], [24.25, 19.853553390593273], [24.0, 19.75], [23.75, 19.853553390593273], [23.67677669529664, 19.82322330470336], [23.53033008588991, 19.46966991411009], [23.0, 19.25], [22.75, 19.353553390593273], [22.67677669529664, 19.32322330470336], [22.53033008588991, 18.96966991411009], [22.0, 18.75], [21.75, 18.853553390593273], [21.67677669529664, 18.82322330470336], [21.53033008588991, 18.46966991411009], [21.0, 18.25], [20.75, 18.353553390593273], [20.5, 18.25], [20.25, 18.353553390593273], [20.0, 18.25], [19.46966991411009, 18.46966991411009], [19.32322330470336, 18.82322330470336], [18.96966991411009, 18.96966991411009], [18.82322330470336, 19.32322330470336], [18.46966991411009, 19.46966991411009], [18.25, 20.0], [18.353553390593273, 20.25]]]}, "2020-08-16T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[18.353553390593273, 20.25], [18.25, 20.5], [18.353553390593273, 20.75], [18.25, 21.0], [18.46966991411009, 21.53033008588991], [19.0, 21.75], [19.53033008588991, 21.53033008588991], [19.69822330470336, 21.125], [19.82322330470336, 21.17677669529664], [19.96966991411009, 21.53033008588991], [20.5, 21.75], [20.75, 21.646446609406727], [21.0, 21.75], [21.53033008588991, 21.53033008588991], [21.75, 21.0], [21.646446609406727, 20.75], [21.69822330470336, 20.625], [21.82322330470336, 20.67677669529664], [21.96966991411009, 21.03033008588991], [22.32322330470336, 21.17677669529664], [22.353553390593273, 21.25], [22.25, 21.5], [22.46966991411009, 22.03033008588991], [23.0, 22.25], [23.25, 22.146446609406727], [23.5, 22.25], [23.75, 22.146446609406727], [24.0, 22.25], [24.25, 22.146446609406727], [24.32322330470336, 22.17677669529664], [24.353553390593273, 22.25], [24.25, 22.5], [24.46966991411009, 23.03033008588991], [25.0, 23.25], [25.426776695296635, 23.073223304703365], [25.25, 23.5], [25.46966991411009, 24.03033008588991], [26.0, 24.25], [26.53033008588991, 24.03033008588991], [26.75, 23.5], [26.573223304703365, 23.073223304703365], [27.0, 23.25], [27.53033008588991, 23.03033008588991], [27.75, 22.5], [27.646446609406727, 22.25], [27.67677669529664, 22.17677669529664], [28.03033008588991, 22.03033008588991], [28.17677669529664, 21.67677669529664], [28.25, 21.646446609406727], [28.5, 21.75], [28.75, 21.646446609406727], [29.0, 21.75], [29.53033008588991, 21.53033008588991], [29.75, 21.0], [29.53033008588991, 20.46966991411009], [29.17677669529664, 20.32322330470336], [29.03033008588991, 19.96966991411009], [28.67677669529664, 19.82322330470336], [28.53033008588991, 19.46966991411009], [28.17677669529664, 19.32322330470336], [28.03033008588991, 18.96966991411009], [27.5, 18.75], [26.96966991411009, 18.96966991411009], [26.82322330470336, 19.32322330470336], [26.75, 19.353553390593273], [26.5, 19.25], [26.25, 19.353553390593273], [26.17677669529664, 19.32322330470336], [26.146446609406727, 19.25], [26.25, 19.0], [26.03033008588991, 18.46966991411009], [25.5, 18.25], [24.96966991411009, 18.46966991411009], [24.82322330470336, 18.82322330470336], [24.46966991411009, 18.96966991411009], [24.25, 19.5], [24.353553390593273, 19.75], [24.32322330470336, 19.82322330470336], [24.25, 19.853553390593273], [24.0, 19.75], [23.75, 19.853553390593273], [23.67677669529664, 19.82322330470336], [23.53033008588991, 19.46966991411009], [23.0, 19.25], [22.75, 19.353553390593273], [22.67677669529664, 19.32322330470336], [22.53033008588991, 18.96966991411009], [22.0, 18.75], [21.75, 18.853553390593273], [21.67677669529664, 18.82322330470336], [21.53033008588991, 18.46966991411009], [21.0, 18.25], [20.75, 18.353553390593273], [20.5, 18.25], [20.25, 18.353553390593273], [20.0, 18.25], [19.46966991411009, 18.46966991411009], [19.32322330470336, 18.82322330470336], [18.96966991411009, 18.96966991411009], [18.82322330470336, 19.32322330470336], [18.46966991411009, 19.46966991411009], [18.25, 20.0], [18.353553390593273, 20.25]], [[25.75, 22.646446609406727], [26.0, 22.75], [25.573223304703365, 22.926776695296635], [25.67677669529664, 22.67677669529664], [25.75, 22.646446609406727]], [[26.0, 22.75], [26.30177669529664, 22.625], [26.426776695296635, 22.926776695296635], [26.0, 22.75]]]}, "2020-08-17T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[18.353553390593273, 20.25], [18.25, 20.5], [18.353553390593273, 20.75], [18.25, 21.0], [18.46966991411009, 21.53033008588991], [19.0, 21.75], [19.53033008588991, 21.53033008588991], [19.69822330470336, 21.125], [19.82322330470336, 21.17677669529664], [19.96966991411009, 21.53033008588991], [20.5, 21.75], [20.75, 21.646446609406727], [21.0, 21.75], [21.53033008588991, 21.53033008588991], [21.75, 21.0], [21.53033008588991, 20.46966991411009], [21.17677669529664, 20.32322330470336], [21.146446609406727, 20.25], [21.25, 20.0], [21.146446609406727, 19.75], [21.25, 19.5], [21.03033008588991, 18.96966991411009], [20.5, 18.75], [20.25, 18.853553390593273], [20.0, 18.75], [19.75, 18.853553390593273], [19.5, 18.75], [18.96966991411009, 18.96966991411009], [18.82322330470336, 19.32322330470336], [18.46966991411009, 19.46966991411009], [18.25, 20.0], [18.353553390593273, 20.25]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -3.1180885095101303}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.146020623565224}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [27.675116150832707, 29.158474829273644, 29.200439422269028, 29.60093412784522, 29.587512788930326]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [25.657381171523014, 25.19386061223082, 25.565521932735464, 25.91324518289781, 26.03227288906345]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.3624917690636145, -2.3130586254705356, -2.2128974117428735, -1.9319757528543, -1.6860909359560572]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-2.72956072897, -3.1180885095101303, -3.009221786469027, -2.38025078311955, -2.0793324988167114]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3970186883680862, -1.5600271174445217, -1.55558029994263, -1.431246698624431, -1.4377401475540348]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5500521823376425, -1.856223537635675, -1.9171153528207667, -1.689065163396583, -1.7036656157503998]}}