{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:51:54.416685", "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-Mar-31_to_2023-Apr-02_29.0_21.5"}, "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": 2023030001044}, "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 31 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 02 2023"}, "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": 63337.65604626962}, "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": 21.5}, "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": 29.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "29.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 26.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 29.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 20.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 22.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[25.47, 23.03], [26.0, 23.25], [26.53, 23.03], [26.68, 22.68], [26.75, 22.65], [27.0, 22.75], [27.53, 22.53], [27.68, 22.18], [27.75, 22.15], [27.82, 22.18], [27.97, 22.53], [28.5, 22.75], [28.75, 22.65], [29.0, 22.75], [29.25, 22.65], [29.5, 22.75], [30.03, 22.53], [30.25, 22.0], [30.15, 21.75], [30.25, 21.5], [30.15, 21.25], [30.25, 21.0], [30.03, 20.47], [29.68, 20.32], [29.53, 19.97], [29.0, 19.75], [28.75, 19.85], [28.5, 19.75], [28.25, 19.85], [28.0, 19.75], [27.75, 19.85], [27.5, 19.75], [26.97, 19.97], [26.82, 20.32], [26.47, 20.47], [26.25, 21.0], [26.35, 21.25], [26.32, 21.32], [25.97, 21.47], [25.82, 21.82], [25.47, 21.97], [25.25, 22.5], [25.47, 23.03]]]]}}, "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": {"2023-03-31T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[25.47, 21.97], [25.25, 22.5], [25.47, 23.03], [26.0, 23.25], [26.53, 23.03], [26.68, 22.68], [26.75, 22.65], [27.0, 22.75], [27.53, 22.53], [27.68, 22.18], [27.75, 22.15], [27.82, 22.18], [27.97, 22.53], [28.5, 22.75], [28.75, 22.65], [29.0, 22.75], [29.25, 22.65], [29.5, 22.75], [30.03, 22.53], [30.25, 22.0], [30.15, 21.75], [30.25, 21.5], [30.15, 21.25], [30.25, 21.0], [30.03, 20.47], [29.68, 20.32], [29.53, 19.97], [29.0, 19.75], [28.75, 19.85], [28.5, 19.75], [28.25, 19.85], [28.0, 19.75], [27.75, 19.85], [27.5, 19.75], [26.97, 19.97], [26.82, 20.32], [26.47, 20.47], [26.25, 21.0], [26.35, 21.25], [26.32, 21.32], [25.97, 21.47], [25.82, 21.82], [25.47, 21.97]]]]}, "2023-04-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[25.47, 21.97], [25.25, 22.5], [25.47, 23.03], [26.0, 23.25], [26.53, 23.03], [26.68, 22.68], [26.75, 22.65], [27.0, 22.75], [27.53, 22.53], [27.68, 22.18], [27.75, 22.15], [27.82, 22.18], [27.97, 22.53], [28.5, 22.75], [28.75, 22.65], [29.0, 22.75], [29.25, 22.65], [29.5, 22.75], [30.03, 22.53], [30.25, 22.0], [30.15, 21.75], [30.25, 21.5], [30.15, 21.25], [30.25, 21.0], [30.03, 20.47], [29.68, 20.32], [29.53, 19.97], [29.0, 19.75], [28.75, 19.85], [28.5, 19.75], [28.25, 19.85], [28.0, 19.75], [27.75, 19.85], [27.5, 19.75], [26.97, 19.97], [26.82, 20.32], [26.47, 20.47], [26.25, 21.0], [26.35, 21.25], [26.32, 21.32], [25.97, 21.47], [25.82, 21.82], [25.47, 21.97]]]]}, "2023-04-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[25.47, 21.97], [25.25, 22.5], [25.47, 23.03], [26.0, 23.25], [26.53, 23.03], [26.68, 22.68], [26.75, 22.65], [27.0, 22.75], [27.53, 22.53], [27.68, 22.18], [27.75, 22.15], [27.82, 22.18], [27.97, 22.53], [28.5, 22.75], [28.75, 22.65], [29.0, 22.75], [29.25, 22.65], [29.5, 22.75], [30.03, 22.53], [30.25, 22.0], [30.15, 21.75], [30.25, 21.5], [30.15, 21.25], [30.25, 21.0], [30.03, 20.47], [29.68, 20.32], [29.53, 19.97], [29.0, 19.75], [28.75, 19.85], [28.5, 19.75], [28.25, 19.85], [28.0, 19.75], [27.75, 19.85], [27.5, 19.75], [26.97, 19.97], [26.82, 20.32], [26.47, 20.47], [26.25, 21.0], [26.35, 21.25], [26.32, 21.32], [25.97, 21.47], [25.82, 21.82], [25.47, 21.97]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -6.19804942697607}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.3393224444343605}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [16.48954731413488, 16.327448416584616, 18.277951327984454]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [14.881264479061826, 15.016933220760393, 16.938914029727357]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.537328177961786, -6.0439054252550966, -4.4367337300862]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.772658431051298, -6.19804942697607, -4.606810567435389]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.7117762555556526, -1.847414164830321, -1.3247901782312066]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.7784792148357724, -1.9218081042248274, -1.380650254456918]}}