{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:07:35.707443", "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-09_to_2025-Sep-12_32.0_23.5"}, "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": 2025090000292}, "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 09 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 12 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 4}, "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": 96386.57444518362}, "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": 23.5}, "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": 32.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "32.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 31.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 34.0}, "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": 26.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[31.75, 25.15], [32.0, 25.25], [32.25, 25.15], [32.5, 25.25], [32.75, 25.15], [32.82, 25.18], [32.85, 25.25], [32.75, 25.5], [32.85, 25.75], [32.75, 26.0], [32.97, 26.53], [33.5, 26.75], [34.03, 26.53], [34.25, 26.0], [34.15, 25.75], [34.18, 25.68], [34.53, 25.53], [34.75, 25.0], [34.65, 24.75], [34.75, 24.5], [34.65, 24.25], [34.75, 24.0], [34.65, 23.75], [34.75, 23.5], [34.53, 22.97], [34.0, 22.75], [33.75, 22.85], [33.68, 22.82], [33.65, 22.75], [33.75, 22.5], [33.54, 22.0], [33.75, 21.5], [33.65, 21.25], [33.75, 21.0], [33.53, 20.47], [33.18, 20.32], [33.03, 19.97], [32.5, 19.75], [31.97, 19.97], [31.82, 20.32], [31.47, 20.47], [31.25, 21.0], [31.47, 21.53], [31.88, 21.7], [31.8, 21.88], [31.5, 21.75], [30.97, 21.97], [30.75, 22.5], [30.85, 22.75], [30.75, 23.0], [30.85, 23.25], [30.75, 23.5], [30.85, 23.75], [30.75, 24.0], [30.85, 24.25], [30.75, 24.5], [30.97, 25.03], [31.5, 25.25], [31.75, 25.15]]]]}}, "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": {"2025-09-09T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[30.75, 24.5], [30.97, 25.03], [31.5, 25.25], [31.75, 25.15], [32.0, 25.25], [32.25, 25.15], [32.5, 25.25], [32.75, 25.15], [32.82, 25.18], [32.85, 25.25], [32.75, 25.5], [32.85, 25.75], [32.75, 26.0], [32.97, 26.53], [33.5, 26.75], [34.03, 26.53], [34.25, 26.0], [34.15, 25.75], [34.18, 25.68], [34.53, 25.53], [34.75, 25.0], [34.65, 24.75], [34.75, 24.5], [34.65, 24.25], [34.75, 24.0], [34.65, 23.75], [34.75, 23.5], [34.53, 22.97], [34.0, 22.75], [33.75, 22.85], [33.68, 22.82], [33.65, 22.75], [33.75, 22.5], [33.54, 22.0], [33.75, 21.5], [33.65, 21.25], [33.75, 21.0], [33.53, 20.47], [33.18, 20.32], [33.03, 19.97], [32.5, 19.75], [31.97, 19.97], [31.82, 20.32], [31.47, 20.47], [31.25, 21.0], [31.47, 21.53], [31.88, 21.7], [31.75, 22.0], [31.96, 22.5], [31.82, 22.82], [31.47, 22.97], [31.32, 23.32], [30.97, 23.47], [30.75, 24.0], [30.85, 24.25], [30.75, 24.5]]]]}, "2025-09-10T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[30.75, 23.0], [30.85, 23.25], [30.75, 23.5], [30.85, 23.75], [30.75, 24.0], [30.85, 24.25], [30.75, 24.5], [30.97, 25.03], [31.5, 25.25], [31.75, 25.15], [32.0, 25.25], [32.25, 25.15], [32.5, 25.25], [32.75, 25.15], [32.82, 25.18], [32.85, 25.25], [32.75, 25.5], [32.85, 25.75], [32.75, 26.0], [32.97, 26.53], [33.5, 26.75], [34.03, 26.53], [34.25, 26.0], [34.15, 25.75], [34.18, 25.68], [34.53, 25.53], [34.75, 25.0], [34.65, 24.75], [34.75, 24.5], [34.65, 24.25], [34.75, 24.0], [34.65, 23.75], [34.75, 23.5], [34.53, 22.97], [34.0, 22.75], [33.75, 22.85], [33.68, 22.82], [33.65, 22.75], [33.75, 22.5], [33.54, 22.0], [33.75, 21.5], [33.65, 21.25], [33.75, 21.0], [33.53, 20.47], [33.18, 20.32], [33.03, 19.97], [32.5, 19.75], [31.97, 19.97], [31.82, 20.32], [31.47, 20.47], [31.25, 21.0], [31.47, 21.53], [31.88, 21.7], [31.8, 21.88], [31.5, 21.75], [30.97, 21.97], [30.75, 22.5], [30.85, 22.75], [30.75, 23.0]]]]}, "2025-09-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[30.75, 23.0], [30.85, 23.25], [30.75, 23.5], [30.85, 23.75], [30.75, 24.0], [30.85, 24.25], [30.75, 24.5], [30.97, 25.03], [31.5, 25.25], [31.75, 25.15], [32.0, 25.25], [32.25, 25.15], [32.5, 25.25], [32.75, 25.15], [32.82, 25.18], [32.85, 25.25], [32.75, 25.5], [32.85, 25.75], [32.75, 26.0], [32.97, 26.53], [33.5, 26.75], [34.03, 26.53], [34.25, 26.0], [34.15, 25.75], [34.18, 25.68], [34.53, 25.53], [34.75, 25.0], [34.65, 24.75], [34.75, 24.5], [34.65, 24.25], [34.75, 24.0], [34.65, 23.75], [34.75, 23.5], [34.53, 22.97], [34.0, 22.75], [33.75, 22.85], [33.68, 22.82], [33.65, 22.75], [33.75, 22.5], [33.54, 22.0], [33.75, 21.5], [33.65, 21.25], [33.75, 21.0], [33.53, 20.47], [33.18, 20.32], [33.03, 19.97], [32.5, 19.75], [31.97, 19.97], [31.82, 20.32], [31.47, 20.47], [31.25, 21.0], [31.47, 21.53], [31.88, 21.7], [31.8, 21.88], [31.5, 21.75], [30.97, 21.97], [30.75, 22.5], [30.85, 22.75], [30.75, 23.0]]]]}, "2025-09-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[30.75, 23.0], [30.85, 23.25], [30.75, 23.5], [30.85, 23.75], [30.75, 24.0], [30.85, 24.25], [30.75, 24.5], [30.97, 25.03], [31.5, 25.25], [32.03, 25.03], [32.18, 24.68], [32.53, 24.53], [32.68, 24.18], [33.03, 24.03], [33.25, 23.5], [33.15, 23.25], [33.25, 23.0], [33.03, 22.47], [32.5, 22.25], [32.25, 22.35], [32.18, 22.32], [32.03, 21.97], [31.5, 21.75], [30.97, 21.97], [30.75, 22.5], [30.85, 22.75], [30.75, 23.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -3.790118309828472}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.7056900209546884}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [29.796166653103285, 29.668707410027025, 29.442842924828597, 28.87714131673181]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [27.079456583658896, 26.924581146240257, 26.58040898640951, 26.47388610839846]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.4965325618157483, -2.6610911207853825, -2.8859229307373404, -2.8720067656861317]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-2.8347039874614097, -3.3400132162765317, -3.790118309828472, -3.168185010460377]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.2927050956093686, -1.317328543528938, -1.4028386015920784, -1.290204941264387]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.4143962965874937, -1.672807259049812, -1.7937510246209833, -1.3792389714853424]}}