{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:03:53.036535", "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-Mar-21_to_2025-Mar-23_34.0_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": 2025030000580}, "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": "March 21 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "March 23 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": 411636.3776368838}, "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": ["Egypt", "Sudan"]}, "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": 34.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "34.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 26.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 35.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 19.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 25.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[26.5, 23.75], [26.75, 23.65], [26.82, 23.68], [26.97, 24.03], [27.5, 24.25], [27.75, 24.15], [28.0, 24.25], [28.25, 24.15], [28.32, 24.18], [28.35, 24.25], [28.25, 24.5], [28.35, 24.75], [28.25, 25.0], [28.47, 25.53], [29.0, 25.75], [29.53, 25.53], [29.68, 25.18], [29.75, 25.15], [29.82, 25.18], [29.97, 25.53], [30.5, 25.75], [31.03, 25.53], [31.18, 25.18], [31.53, 25.03], [31.68, 24.68], [31.75, 24.65], [32.0, 24.75], [32.25, 24.65], [32.5, 24.75], [32.75, 24.65], [33.0, 24.75], [33.3, 24.63], [33.35, 24.75], [33.25, 25.0], [33.35, 25.25], [33.25, 25.5], [33.47, 26.03], [34.0, 26.25], [34.53, 26.03], [34.68, 25.68], [35.03, 25.53], [35.25, 25.0], [35.15, 24.75], [35.18, 24.68], [35.53, 24.53], [35.75, 24.0], [35.65, 23.75], [35.75, 23.5], [35.65, 23.25], [35.75, 23.0], [35.65, 22.75], [35.75, 22.5], [35.65, 22.25], [35.75, 22.0], [35.65, 21.75], [35.75, 21.5], [35.53, 20.97], [35.18, 20.82], [35.03, 20.47], [34.68, 20.32], [34.53, 19.97], [34.18, 19.82], [34.03, 19.47], [33.5, 19.25], [33.25, 19.35], [33.0, 19.25], [32.75, 19.35], [32.68, 19.32], [32.53, 18.97], [32.0, 18.75], [31.75, 18.85], [31.5, 18.75], [31.25, 18.85], [31.0, 18.75], [30.47, 18.97], [30.32, 19.32], [30.25, 19.35], [30.0, 19.25], [29.75, 19.35], [29.5, 19.25], [28.97, 19.47], [28.75, 20.0], [28.85, 20.25], [28.82, 20.32], [28.75, 20.35], [28.5, 20.25], [27.97, 20.47], [27.82, 20.82], [27.75, 20.85], [27.5, 20.75], [26.97, 20.97], [26.82, 21.32], [26.47, 21.47], [26.32, 21.82], [25.97, 21.97], [25.75, 22.5], [25.85, 22.75], [25.75, 23.0], [25.97, 23.53], [26.5, 23.75]]]]}}, "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": {"2025-03-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[25.75, 23.0], [25.97, 23.53], [26.5, 23.75], [26.75, 23.65], [26.82, 23.68], [26.97, 24.03], [27.5, 24.25], [27.75, 24.15], [28.0, 24.25], [28.25, 24.15], [28.32, 24.18], [28.35, 24.25], [28.25, 24.5], [28.35, 24.75], [28.25, 25.0], [28.47, 25.53], [29.0, 25.75], [29.53, 25.53], [29.68, 25.18], [29.75, 25.15], [29.82, 25.18], [29.97, 25.53], [30.5, 25.75], [31.03, 25.53], [31.18, 25.18], [31.53, 25.03], [31.68, 24.68], [31.75, 24.65], [32.0, 24.75], [32.25, 24.65], [32.5, 24.75], [32.75, 24.65], [33.0, 24.75], [33.3, 24.63], [33.35, 24.75], [33.25, 25.0], [33.35, 25.25], [33.25, 25.5], [33.47, 26.03], [34.0, 26.25], [34.53, 26.03], [34.68, 25.68], [35.03, 25.53], [35.25, 25.0], [35.15, 24.75], [35.18, 24.68], [35.53, 24.53], [35.75, 24.0], [35.65, 23.75], [35.75, 23.5], [35.65, 23.25], [35.75, 23.0], [35.65, 22.75], [35.75, 22.5], [35.65, 22.25], [35.75, 22.0], [35.65, 21.75], [35.75, 21.5], [35.53, 20.97], [35.18, 20.82], [35.03, 20.47], [34.68, 20.32], [34.53, 19.97], [34.18, 19.82], [34.03, 19.47], [33.5, 19.25], [33.25, 19.35], [33.0, 19.25], [32.75, 19.35], [32.68, 19.32], [32.53, 18.97], [32.0, 18.75], [31.75, 18.85], [31.5, 18.75], [31.25, 18.85], [31.0, 18.75], [30.47, 18.97], [30.32, 19.32], [30.25, 19.35], [30.0, 19.25], [29.75, 19.35], [29.5, 19.25], [28.97, 19.47], [28.75, 20.0], [28.85, 20.25], [28.82, 20.32], [28.75, 20.35], [28.5, 20.25], [27.97, 20.47], [27.82, 20.82], [27.75, 20.85], [27.5, 20.75], [26.97, 20.97], [26.82, 21.32], [26.47, 21.47], [26.32, 21.82], [25.97, 21.97], [25.75, 22.5], [25.85, 22.75], [25.75, 23.0]]]]}, "2025-03-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[25.75, 23.0], [25.97, 23.53], [26.5, 23.75], [26.75, 23.65], [26.82, 23.68], [26.97, 24.03], [27.5, 24.25], [27.75, 24.15], [28.0, 24.25], [28.25, 24.15], [28.32, 24.18], [28.35, 24.25], [28.25, 24.5], [28.35, 24.75], [28.25, 25.0], [28.47, 25.53], [29.0, 25.75], [29.53, 25.53], [29.68, 25.18], [29.75, 25.15], [29.82, 25.18], [29.97, 25.53], [30.5, 25.75], [31.03, 25.53], [31.18, 25.18], [31.53, 25.03], [31.68, 24.68], [31.75, 24.65], [32.0, 24.75], [32.25, 24.65], [32.5, 24.75], [32.75, 24.65], [33.0, 24.75], [33.3, 24.63], [33.35, 24.75], [33.25, 25.0], [33.35, 25.25], [33.25, 25.5], [33.47, 26.03], [34.0, 26.25], [34.53, 26.03], [34.68, 25.68], [35.03, 25.53], [35.25, 25.0], [35.15, 24.75], [35.18, 24.68], [35.53, 24.53], [35.75, 24.0], [35.65, 23.75], [35.75, 23.5], [35.65, 23.25], [35.75, 23.0], [35.65, 22.75], [35.75, 22.5], [35.65, 22.25], [35.75, 22.0], [35.65, 21.75], [35.75, 21.5], [35.53, 20.97], [35.18, 20.82], [35.03, 20.47], [34.68, 20.32], [34.53, 19.97], [34.18, 19.82], [34.03, 19.47], [33.5, 19.25], [33.25, 19.35], [33.0, 19.25], [32.75, 19.35], [32.68, 19.32], [32.53, 18.97], [32.0, 18.75], [31.75, 18.85], [31.5, 18.75], [31.25, 18.85], [31.0, 18.75], [30.47, 18.97], [30.32, 19.32], [30.25, 19.35], [30.0, 19.25], [29.75, 19.35], [29.5, 19.25], [28.97, 19.47], [28.75, 20.0], [28.85, 20.25], [28.82, 20.32], [28.75, 20.35], [28.5, 20.25], [27.97, 20.47], [27.82, 20.82], [27.75, 20.85], [27.5, 20.75], [26.97, 20.97], [26.82, 21.32], [26.47, 21.47], [26.32, 21.82], [25.97, 21.97], [25.75, 22.5], [25.85, 22.75], [25.75, 23.0]]]]}, "2025-03-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[25.75, 23.0], [25.97, 23.53], [26.5, 23.75], [26.75, 23.65], [26.82, 23.68], [26.97, 24.03], [27.5, 24.25], [27.75, 24.15], [28.0, 24.25], [28.25, 24.15], [28.32, 24.18], [28.35, 24.25], [28.25, 24.5], [28.35, 24.75], [28.25, 25.0], [28.47, 25.53], [29.0, 25.75], [29.53, 25.53], [29.68, 25.18], [29.75, 25.15], [29.82, 25.18], [29.97, 25.53], [30.5, 25.75], [31.03, 25.53], [31.18, 25.18], [31.53, 25.03], [31.68, 24.68], [31.75, 24.65], [32.0, 24.75], [32.25, 24.65], [32.5, 24.75], [32.75, 24.65], [33.0, 24.75], [33.3, 24.63], [33.35, 24.75], [33.25, 25.0], [33.35, 25.25], [33.25, 25.5], [33.47, 26.03], [34.0, 26.25], [34.53, 26.03], [34.68, 25.68], [35.03, 25.53], [35.25, 25.0], [35.15, 24.75], [35.18, 24.68], [35.53, 24.53], [35.75, 24.0], [35.65, 23.75], [35.75, 23.5], [35.65, 23.25], [35.75, 23.0], [35.65, 22.75], [35.75, 22.5], [35.65, 22.25], [35.75, 22.0], [35.65, 21.75], [35.75, 21.5], [35.53, 20.97], [35.18, 20.82], [35.03, 20.47], [34.68, 20.32], [34.53, 19.97], [34.18, 19.82], [34.03, 19.47], [33.5, 19.25], [33.25, 19.35], [33.0, 19.25], [32.75, 19.35], [32.68, 19.32], [32.53, 18.97], [32.0, 18.75], [31.75, 18.85], [31.5, 18.75], [31.25, 18.85], [31.0, 18.75], [30.47, 18.97], [30.32, 19.32], [30.25, 19.35], [30.0, 19.25], [29.75, 19.35], [29.5, 19.25], [28.97, 19.47], [28.75, 20.0], [28.85, 20.25], [28.82, 20.32], [28.75, 20.35], [28.5, 20.25], [27.97, 20.47], [27.82, 20.82], [27.75, 20.85], [27.5, 20.75], [26.97, 20.97], [26.82, 21.32], [26.47, 21.47], [26.32, 21.82], [25.97, 21.97], [25.75, 22.5], [25.85, 22.75], [25.75, 23.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -7.366402872433866}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.234348127688896}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [17.141118339256025, 16.24866157814313, 17.432728915744406]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [13.550036366780603, 13.119076029459677, 14.232342020670615]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.910737980786489, -5.929201742060106, -4.863104660220095]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.090824977748696, -7.366402872433866, -6.258351218484563]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5738882858762469, -1.874048444766674, -1.4976230658829868]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.924261035450596, -2.3518950369741973, -1.9699792102268228]}}