{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:56:53.799003", "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-21_to_2025-Sep-27_348.5_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": 2025090000472}, "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 21 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 27 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 7}, "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": 106873.21068097843}, "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": ["Morocco"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.Atlantic-Ocean", "Sahara"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["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": ["North Atlantic Ocean"]}, "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": 348.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "348.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 344.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 349.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 26.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 32.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-09-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-13.5, 28.25], [-12.97, 28.03], [-12.75, 27.5], [-12.97, 26.97], [-13.5, 26.75], [-14.03, 26.97], [-14.25, 27.5], [-14.03, 28.03], [-13.5, 28.25]]]]}, "2025-09-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-14.03, 26.97], [-14.25, 27.5], [-14.03, 28.03], [-13.5, 28.25], [-12.97, 28.03], [-12.75, 27.5], [-12.97, 26.97], [-13.5, 26.75], [-14.03, 26.97]]], [[[-15.03, 32.03], [-14.68, 32.18], [-14.53, 32.53], [-14.0, 32.75], [-13.47, 32.53], [-13.32, 32.18], [-13.25, 32.15], [-13.18, 32.18], [-13.03, 32.53], [-12.5, 32.75], [-12.25, 32.65], [-12.0, 32.75], [-11.47, 32.53], [-11.32, 32.18], [-10.97, 32.03], [-10.75, 31.5], [-10.85, 31.25], [-10.82, 31.18], [-10.47, 31.03], [-10.25, 30.5], [-10.47, 29.97], [-10.82, 29.82], [-10.97, 29.47], [-11.32, 29.32], [-11.47, 28.97], [-12.0, 28.75], [-12.53, 28.97], [-12.75, 29.5], [-12.65, 29.75], [-12.75, 30.0], [-12.65, 30.25], [-12.7, 30.38], [-12.82, 30.32], [-12.97, 29.97], [-13.5, 29.75], [-13.75, 29.85], [-14.0, 29.75], [-14.53, 29.97], [-14.75, 30.5], [-14.65, 30.75], [-14.68, 30.82], [-15.03, 30.97], [-15.25, 31.5], [-15.03, 32.03]]]]}, "2025-09-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.15, 30.25], [-16.25, 30.5], [-16.15, 30.75], [-16.25, 31.0], [-16.03, 31.53], [-15.5, 31.75], [-15.25, 31.65], [-15.18, 31.68], [-15.03, 32.03], [-14.68, 32.18], [-14.53, 32.53], [-14.0, 32.75], [-13.47, 32.53], [-13.32, 32.18], [-13.25, 32.15], [-13.18, 32.18], [-13.03, 32.53], [-12.5, 32.75], [-12.25, 32.65], [-12.0, 32.75], [-11.47, 32.53], [-11.32, 32.18], [-10.97, 32.03], [-10.75, 31.5], [-10.85, 31.25], [-10.82, 31.18], [-10.47, 31.03], [-10.25, 30.5], [-10.47, 29.97], [-10.82, 29.82], [-10.97, 29.47], [-11.32, 29.32], [-11.47, 28.97], [-11.82, 28.82], [-11.85, 28.75], [-11.75, 28.5], [-11.97, 27.97], [-12.5, 27.75], [-12.75, 27.85], [-12.82, 27.82], [-12.85, 27.75], [-12.75, 27.5], [-12.85, 27.25], [-12.75, 27.0], [-12.97, 26.47], [-13.5, 26.25], [-14.03, 26.47], [-14.25, 27.0], [-14.15, 27.25], [-14.25, 27.5], [-14.15, 27.75], [-14.25, 28.0], [-14.15, 28.25], [-14.25, 28.5], [-14.03, 29.03], [-13.5, 29.25], [-13.25, 29.15], [-13.18, 29.18], [-13.03, 29.53], [-12.68, 29.68], [-12.65, 29.75], [-12.75, 30.0], [-12.65, 30.25], [-12.7, 30.38], [-12.82, 30.32], [-12.97, 29.97], [-13.32, 29.82], [-13.47, 29.47], [-14.0, 29.25], [-14.25, 29.35], [-14.32, 29.32], [-14.47, 28.97], [-15.0, 28.75], [-15.25, 28.85], [-15.5, 28.75], [-16.03, 28.97], [-16.25, 29.5], [-16.15, 29.75], [-16.25, 30.0], [-16.15, 30.25]]]]}, "2025-09-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-16.15, 30.25], [-16.25, 30.5], [-16.15, 30.75], [-16.25, 31.0], [-16.03, 31.53], [-15.5, 31.75], [-15.25, 31.65], [-15.18, 31.68], [-15.03, 32.03], [-14.68, 32.18], [-14.53, 32.53], [-14.0, 32.75], [-13.47, 32.53], [-13.32, 32.18], [-13.25, 32.15], [-13.18, 32.18], [-13.03, 32.53], [-12.5, 32.75], [-12.25, 32.65], [-12.0, 32.75], [-11.47, 32.53], [-11.32, 32.18], [-10.97, 32.03], [-10.75, 31.5], [-10.85, 31.25], [-10.82, 31.18], [-10.47, 31.03], [-10.25, 30.5], [-10.47, 29.97], [-10.82, 29.82], [-10.97, 29.47], [-11.32, 29.32], [-11.47, 28.97], [-11.82, 28.82], [-11.85, 28.75], [-11.75, 28.5], [-11.97, 27.97], [-12.5, 27.75], [-12.75, 27.85], [-12.82, 27.82], [-12.85, 27.75], [-12.75, 27.5], [-12.85, 27.25], [-12.75, 27.0], [-12.85, 26.75], [-12.75, 26.5], [-12.97, 25.97], [-13.5, 25.75], [-14.03, 25.97], [-14.25, 26.5], [-14.15, 26.75], [-14.25, 27.0], [-14.15, 27.25], [-14.25, 27.5], [-14.15, 27.75], [-14.25, 28.0], [-14.15, 28.25], [-14.25, 28.5], [-14.03, 29.03], [-13.5, 29.25], [-13.25, 29.15], [-13.18, 29.18], [-13.03, 29.53], [-12.68, 29.68], [-12.65, 29.75], [-12.75, 30.0], [-12.65, 30.25], [-12.7, 30.38], [-12.82, 30.32], [-12.97, 29.97], [-13.32, 29.82], [-13.47, 29.47], [-14.0, 29.25], [-14.25, 29.35], [-14.32, 29.32], [-14.47, 28.97], [-15.0, 28.75], [-15.25, 28.85], [-15.5, 28.75], [-16.03, 28.97], [-16.25, 29.5], [-16.15, 29.75], [-16.25, 30.0], [-16.15, 30.25]]]]}, "2025-09-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-14.25, 28.0], [-14.15, 28.25], [-14.25, 28.5], [-14.03, 29.03], [-13.5, 29.25], [-13.25, 29.15], [-13.18, 29.18], [-13.03, 29.53], [-12.68, 29.68], [-12.65, 29.75], [-12.75, 30.0], [-12.65, 30.25], [-12.75, 30.5], [-12.65, 30.75], [-12.75, 31.0], [-12.54, 31.5], [-12.75, 32.0], [-12.53, 32.53], [-12.0, 32.75], [-11.47, 32.53], [-11.32, 32.18], [-10.97, 32.03], [-10.75, 31.5], [-10.85, 31.25], [-10.82, 31.18], [-10.47, 31.03], [-10.25, 30.5], [-10.47, 29.97], [-10.82, 29.82], [-10.97, 29.47], [-11.32, 29.32], [-11.47, 28.97], [-11.82, 28.82], [-11.85, 28.75], [-11.75, 28.5], [-11.97, 27.97], [-12.5, 27.75], [-12.75, 27.85], [-12.82, 27.82], [-12.96, 27.5], [-12.75, 27.0], [-12.85, 26.75], [-12.75, 26.5], [-12.97, 25.97], [-13.5, 25.75], [-14.03, 25.97], [-14.25, 26.5], [-14.15, 26.75], [-14.25, 27.0], [-14.04, 27.5], [-14.25, 28.0]]], [[[-16.25, 30.5], [-16.15, 30.75], [-16.25, 31.0], [-16.03, 31.53], [-15.5, 31.75], [-15.25, 31.65], [-15.0, 31.75], [-14.47, 31.53], [-14.32, 31.18], [-13.97, 31.03], [-13.82, 30.68], [-13.47, 30.53], [-13.25, 30.0], [-13.47, 29.47], [-14.0, 29.25], [-14.25, 29.35], [-14.32, 29.32], [-14.47, 28.97], [-15.0, 28.75], [-15.25, 28.85], [-15.5, 28.75], [-16.03, 28.97], [-16.25, 29.5], [-16.15, 29.75], [-16.25, 30.0], [-16.15, 30.25], [-16.25, 30.5]]]]}, "2025-09-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-13.5, 27.75], [-12.97, 27.53], [-12.75, 27.0], [-12.85, 26.75], [-12.75, 26.5], [-12.97, 25.97], [-13.5, 25.75], [-14.03, 25.97], [-14.25, 26.5], [-14.15, 26.75], [-14.25, 27.0], [-14.03, 27.53], [-13.5, 27.75]]], [[[-12.18, 31.18], [-12.03, 31.53], [-11.5, 31.75], [-10.97, 31.53], [-10.75, 31.0], [-10.85, 30.75], [-10.75, 30.5], [-10.85, 30.25], [-10.75, 30.0], [-10.97, 29.47], [-11.5, 29.25], [-11.75, 29.35], [-12.0, 29.25], [-12.53, 29.47], [-12.75, 30.0], [-12.65, 30.25], [-12.75, 30.5], [-12.53, 31.03], [-12.18, 31.18]]]]}, "2025-09-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-12.53, 31.03], [-12.18, 31.18], [-12.03, 31.53], [-11.5, 31.75], [-10.97, 31.53], [-10.75, 31.0], [-10.85, 30.75], [-10.75, 30.5], [-10.97, 29.97], [-11.32, 29.82], [-11.47, 29.47], [-12.0, 29.25], [-12.53, 29.47], [-12.75, 30.0], [-12.65, 30.25], [-12.75, 30.5], [-12.53, 31.03]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -2.4301335751354713}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -1.0362394743777492}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [20.632632191975915, 21.14624592174181, 21.111817834316184, 21.27222518920894, 21.269497172037802, 21.079597364153187, 21.11934941609701]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [20.632632191975915, 20.331641133626306, 20.152176157633505, 20.478871917724632, 20.43121999104818, 20.777781422932946, 20.93966191609701]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-0.8825916863269185, -0.9844478481022375, -1.1263691431394018, -0.9947796517841525, -1.0116274450186202, -1.1579336929517905, -0.8546586444249584]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-0.8825916863269185, -1.3340018524265247, -1.6103643838745256, -2.4301335751354713, -2.2497951236579183, -2.2495711836588157, -0.8844071562396039]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4144571354806794, -1.5460054664251588, -1.761517088040476, -1.486267572576339, -1.4739789511726364, -1.3539827177581698, -1.3121024920859996]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.4144571354806794, -2.1535804692634155, -2.5653159231335625, -1.869155047491565, -2.0625871817538344, -1.5367156307773477, -1.3842838341569572]}}