{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-05-20 10:52:27.653672", "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": "2026-Apr-07_to_2026-Apr-13_352.5_32.0"}, "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": 2026040000239}, "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": "April 07 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 13 2026"}, "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": 545824.4320897255}, "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": ["Algeria", "Mauritania", "Morocco"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Mediterranean", "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": 32.0}, "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": 352.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "352.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 345.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 354.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 24.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 34.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-04-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-14.18, 33.68], [-14.03, 34.03], [-13.68, 34.18], [-13.53, 34.53], [-13.0, 34.75], [-12.75, 34.65], [-12.5, 34.75], [-12.25, 34.65], [-12.0, 34.75], [-11.75, 34.65], [-11.5, 34.75], [-10.97, 34.53], [-10.75, 34.0], [-10.97, 33.47], [-11.5, 33.25], [-11.75, 33.35], [-11.82, 33.32], [-11.97, 32.97], [-12.5, 32.75], [-12.75, 32.85], [-12.82, 32.82], [-12.97, 32.47], [-13.5, 32.25], [-13.75, 32.35], [-13.82, 32.32], [-13.97, 31.97], [-14.5, 31.75], [-15.03, 31.97], [-15.25, 32.5], [-15.03, 33.03], [-14.68, 33.18], [-14.53, 33.53], [-14.18, 33.68]]]]}, "2026-04-08T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-15.15, 31.25], [-15.25, 31.5], [-15.04, 32.0], [-15.25, 32.5], [-15.03, 33.03], [-14.68, 33.18], [-14.53, 33.53], [-14.18, 33.68], [-14.03, 34.03], [-13.68, 34.18], [-13.53, 34.53], [-13.0, 34.75], [-12.75, 34.65], [-12.5, 34.75], [-12.25, 34.65], [-12.0, 34.75], [-11.75, 34.65], [-11.5, 34.75], [-10.97, 34.53], [-10.75, 34.0], [-10.87, 33.7], [-10.75, 33.65], [-10.68, 33.68], [-10.53, 34.03], [-10.0, 34.25], [-9.75, 34.15], [-9.5, 34.25], [-9.25, 34.15], [-9.0, 34.25], [-8.75, 34.15], [-8.68, 34.18], [-8.53, 34.53], [-8.0, 34.75], [-7.75, 34.65], [-7.5, 34.75], [-7.25, 34.65], [-7.18, 34.68], [-7.03, 35.03], [-6.5, 35.25], [-5.97, 35.03], [-5.75, 34.5], [-5.97, 33.97], [-6.32, 33.82], [-6.47, 33.47], [-6.82, 33.32], [-6.93, 33.07], [-6.5, 33.25], [-5.97, 33.03], [-5.75, 32.5], [-5.97, 31.97], [-6.32, 31.82], [-6.47, 31.47], [-6.82, 31.32], [-6.97, 30.97], [-7.37, 30.8], [-7.25, 30.5], [-7.47, 29.97], [-8.0, 29.75], [-8.25, 29.85], [-8.32, 29.82], [-8.47, 29.47], [-8.82, 29.32], [-8.85, 29.25], [-8.75, 29.0], [-8.97, 28.47], [-9.32, 28.32], [-9.35, 28.25], [-9.25, 28.0], [-9.47, 27.47], [-10.0, 27.25], [-10.25, 27.35], [-10.32, 27.32], [-10.47, 26.97], [-10.82, 26.82], [-10.85, 26.75], [-10.75, 26.5], [-10.97, 25.97], [-11.32, 25.82], [-11.47, 25.47], [-12.0, 25.25], [-12.53, 25.47], [-12.75, 26.0], [-12.65, 26.25], [-12.68, 26.32], [-12.75, 26.35], [-13.0, 26.25], [-13.53, 26.47], [-13.75, 27.0], [-13.65, 27.25], [-13.75, 27.5], [-13.53, 28.03], [-13.0, 28.25], [-12.75, 28.15], [-12.5, 28.25], [-12.25, 28.15], [-12.18, 28.18], [-12.03, 28.53], [-11.68, 28.68], [-11.62, 28.8], [-11.75, 28.85], [-12.0, 28.75], [-12.25, 28.85], [-12.5, 28.75], [-12.75, 28.85], [-13.0, 28.75], [-13.25, 28.85], [-13.5, 28.75], [-14.03, 28.97], [-14.18, 29.32], [-14.53, 29.47], [-14.68, 29.82], [-15.03, 29.97], [-15.25, 30.5], [-15.15, 30.75], [-15.25, 31.0], [-15.15, 31.25]], [[-12.07, 32.93], [-12.5, 32.75], [-12.25, 32.65], [-12.18, 32.68], [-12.07, 32.93]], [[-12.75, 32.85], [-12.82, 32.82], [-12.87, 32.7], [-12.75, 32.65], [-12.5, 32.75], [-12.75, 32.85]], [[-11.68, 33.18], [-11.62, 33.3], [-11.75, 33.35], [-11.82, 33.32], [-11.93, 33.07], [-11.68, 33.18]]]]}, "2026-04-09T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-15.15, 31.25], [-15.25, 31.5], [-15.04, 32.0], [-15.25, 32.5], [-15.03, 33.03], [-14.68, 33.18], [-14.53, 33.53], [-14.18, 33.68], [-14.03, 34.03], [-13.68, 34.18], [-13.53, 34.53], [-13.0, 34.75], [-12.75, 34.65], [-12.5, 34.75], [-12.25, 34.65], [-12.0, 34.75], [-11.75, 34.65], [-11.5, 34.75], [-10.97, 34.53], [-10.75, 34.0], [-10.87, 33.7], [-10.75, 33.65], [-10.68, 33.68], [-10.53, 34.03], [-10.0, 34.25], [-9.75, 34.15], [-9.5, 34.25], [-9.25, 34.15], [-9.0, 34.25], [-8.75, 34.15], [-8.68, 34.18], [-8.53, 34.53], [-8.0, 34.75], [-7.75, 34.65], [-7.5, 34.75], [-7.25, 34.65], [-7.18, 34.68], [-7.03, 35.03], [-6.5, 35.25], [-5.97, 35.03], [-5.75, 34.5], [-5.97, 33.97], [-6.32, 33.82], [-6.47, 33.47], [-6.82, 33.32], [-6.93, 33.07], [-6.5, 33.25], [-5.97, 33.03], [-5.75, 32.5], [-5.85, 32.25], [-5.75, 32.0], [-5.97, 31.47], [-6.5, 31.25], [-5.97, 31.03], [-5.75, 30.5], [-5.85, 30.25], [-5.82, 30.18], [-5.47, 30.03], [-5.32, 29.68], [-4.97, 29.53], [-4.75, 29.0], [-4.85, 28.75], [-4.75, 28.5], [-4.85, 28.25], [-4.75, 28.0], [-4.97, 27.47], [-5.32, 27.32], [-5.35, 27.25], [-5.25, 27.0], [-5.47, 26.47], [-5.82, 26.32], [-5.97, 25.97], [-6.5, 25.75], [-6.75, 25.85], [-7.0, 25.75], [-7.25, 25.85], [-7.32, 25.82], [-7.47, 25.47], [-8.0, 25.25], [-8.25, 25.35], [-8.32, 25.32], [-8.47, 24.97], [-8.82, 24.82], [-8.97, 24.47], [-9.5, 24.25], [-9.75, 24.35], [-10.0, 24.25], [-10.53, 24.47], [-10.75, 25.0], [-10.53, 25.53], [-10.18, 25.68], [-10.15, 25.75], [-10.25, 26.0], [-10.15, 26.25], [-10.25, 26.5], [-10.03, 27.03], [-9.68, 27.18], [-9.65, 27.25], [-9.7, 27.38], [-10.0, 27.25], [-10.25, 27.35], [-10.32, 27.32], [-10.47, 26.97], [-10.82, 26.82], [-10.85, 26.75], [-10.75, 26.5], [-10.97, 25.97], [-11.32, 25.82], [-11.47, 25.47], [-12.0, 25.25], [-12.53, 25.47], [-12.75, 26.0], [-12.65, 26.25], [-12.68, 26.32], [-12.75, 26.35], [-13.0, 26.25], [-13.53, 26.47], [-13.75, 27.0], [-13.65, 27.25], [-13.75, 27.5], [-13.53, 28.03], [-13.0, 28.25], [-12.75, 28.15], [-12.5, 28.25], [-12.25, 28.15], [-12.18, 28.18], [-12.03, 28.53], [-11.68, 28.68], [-11.62, 28.8], [-11.75, 28.85], [-12.0, 28.75], [-12.25, 28.85], [-12.5, 28.75], [-12.75, 28.85], [-13.0, 28.75], [-13.25, 28.85], [-13.5, 28.75], [-14.03, 28.97], [-14.18, 29.32], [-14.53, 29.47], [-14.68, 29.82], [-15.03, 29.97], [-15.25, 30.5], [-15.15, 30.75], [-15.25, 31.0], [-15.15, 31.25]], [[-6.75, 31.35], [-6.82, 31.32], [-6.87, 31.2], [-6.75, 31.15], [-6.5, 31.25], [-6.75, 31.35]], [[-12.07, 32.93], [-12.5, 32.75], [-12.25, 32.65], [-12.18, 32.68], [-12.07, 32.93]], [[-12.75, 32.85], [-12.82, 32.82], [-12.87, 32.7], [-12.75, 32.65], [-12.5, 32.75], [-12.75, 32.85]], [[-11.68, 33.18], [-11.62, 33.3], [-11.75, 33.35], [-11.82, 33.32], [-11.93, 33.07], [-11.68, 33.18]]]]}, "2026-04-10T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-15.15, 31.25], [-15.25, 31.5], [-15.03, 32.03], [-14.68, 32.18], [-14.53, 32.53], [-14.0, 32.75], [-13.75, 32.65], [-13.5, 32.75], [-13.25, 32.65], [-13.0, 32.75], [-12.75, 32.65], [-12.5, 32.75], [-12.25, 32.65], [-12.18, 32.68], [-12.03, 33.03], [-11.68, 33.18], [-11.53, 33.53], [-11.0, 33.75], [-10.75, 33.65], [-10.68, 33.68], [-10.53, 34.03], [-10.0, 34.25], [-9.75, 34.15], [-9.5, 34.25], [-9.25, 34.15], [-9.0, 34.25], [-8.75, 34.15], [-8.68, 34.18], [-8.53, 34.53], [-8.0, 34.75], [-7.75, 34.65], [-7.5, 34.75], [-7.25, 34.65], [-7.18, 34.68], [-7.03, 35.03], [-6.5, 35.25], [-5.97, 35.03], [-5.75, 34.5], [-5.97, 33.97], [-6.32, 33.82], [-6.47, 33.47], [-6.82, 33.32], [-6.87, 33.2], [-6.75, 33.15], [-6.5, 33.25], [-5.97, 33.03], [-5.75, 32.5], [-5.85, 32.25], [-5.75, 32.0], [-5.97, 31.47], [-6.32, 31.32], [-6.37, 31.2], [-5.97, 31.03], [-5.75, 30.5], [-5.85, 30.25], [-5.82, 30.18], [-5.47, 30.03], [-5.32, 29.68], [-4.97, 29.53], [-4.75, 29.0], [-4.85, 28.75], [-4.75, 28.5], [-4.85, 28.25], [-4.75, 28.0], [-4.97, 27.47], [-5.32, 27.32], [-5.35, 27.25], [-5.25, 27.0], [-5.47, 26.47], [-5.82, 26.32], [-5.85, 26.25], [-5.75, 26.0], [-5.97, 25.47], [-6.5, 25.25], [-6.75, 25.35], [-7.0, 25.25], [-7.5, 25.46], [-8.0, 25.25], [-8.25, 25.35], [-8.32, 25.32], [-8.47, 24.97], [-8.82, 24.82], [-8.97, 24.47], [-9.5, 24.25], [-9.75, 24.35], [-10.0, 24.25], [-10.53, 24.47], [-10.75, 25.0], [-10.53, 25.53], [-10.18, 25.68], [-10.15, 25.75], [-10.25, 26.0], [-10.15, 26.25], [-10.25, 26.5], [-10.03, 27.03], [-9.68, 27.18], [-9.65, 27.25], [-9.7, 27.38], [-10.0, 27.25], [-10.25, 27.35], [-10.32, 27.32], [-10.47, 26.97], [-10.82, 26.82], [-10.85, 26.75], [-10.75, 26.5], [-10.97, 25.97], [-11.32, 25.82], [-11.47, 25.47], [-12.0, 25.25], [-12.53, 25.47], [-12.75, 26.0], [-12.65, 26.25], [-12.68, 26.32], [-12.75, 26.35], [-13.0, 26.25], [-13.53, 26.47], [-13.75, 27.0], [-13.65, 27.25], [-13.75, 27.5], [-13.53, 28.03], [-13.0, 28.25], [-12.75, 28.15], [-12.5, 28.25], [-12.25, 28.15], [-12.18, 28.18], [-12.03, 28.53], [-11.68, 28.68], [-11.62, 28.8], [-11.75, 28.85], [-12.0, 28.75], [-12.25, 28.85], [-12.5, 28.75], [-12.75, 28.85], [-13.0, 28.75], [-13.25, 28.85], [-13.5, 28.75], [-14.03, 28.97], [-14.18, 29.32], [-14.53, 29.47], [-14.68, 29.82], [-15.03, 29.97], [-15.25, 30.5], [-15.15, 30.75], [-15.25, 31.0], [-15.15, 31.25]]]]}, "2026-04-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-10.25, 26.0], [-10.15, 26.25], [-10.25, 26.5], [-10.03, 27.03], [-9.68, 27.18], [-9.65, 27.25], [-9.75, 27.5], [-9.65, 27.75], [-9.68, 27.82], [-10.03, 27.97], [-10.25, 28.5], [-10.15, 28.75], [-10.25, 29.0], [-10.15, 29.25], [-10.25, 29.5], [-10.04, 30.0], [-10.25, 30.5], [-10.15, 30.75], [-10.25, 31.0], [-10.15, 31.25], [-10.25, 31.5], [-10.03, 32.03], [-9.68, 32.18], [-9.53, 32.53], [-9.0, 32.75], [-8.5, 32.54], [-8.0, 32.75], [-7.75, 32.65], [-7.68, 32.68], [-7.53, 33.03], [-7.0, 33.25], [-6.75, 33.15], [-6.68, 33.18], [-6.53, 33.53], [-6.0, 33.75], [-5.47, 33.53], [-5.25, 33.0], [-5.47, 32.47], [-5.82, 32.32], [-5.85, 32.25], [-5.75, 32.0], [-5.97, 31.47], [-6.32, 31.32], [-6.37, 31.2], [-5.97, 31.03], [-5.75, 30.5], [-5.85, 30.25], [-5.82, 30.18], [-5.47, 30.03], [-5.32, 29.68], [-4.97, 29.53], [-4.75, 29.0], [-4.85, 28.75], [-4.75, 28.5], [-4.85, 28.25], [-4.75, 28.0], [-4.97, 27.47], [-5.32, 27.32], [-5.35, 27.25], [-5.25, 27.0], [-5.47, 26.47], [-5.82, 26.32], [-5.85, 26.25], [-5.75, 26.0], [-5.97, 25.47], [-6.5, 25.25], [-6.75, 25.35], [-7.0, 25.25], [-7.5, 25.46], [-8.0, 25.25], [-8.25, 25.35], [-8.32, 25.32], [-8.47, 24.97], [-8.82, 24.82], [-8.97, 24.47], [-9.5, 24.25], [-9.75, 24.35], [-10.0, 24.25], [-10.53, 24.47], [-10.75, 25.0], [-10.53, 25.53], [-10.18, 25.68], [-10.15, 25.75], [-10.25, 26.0]]]]}, "2026-04-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-7.75, 26.0], [-7.53, 26.53], [-7.0, 26.75], [-6.75, 26.65], [-6.5, 26.75], [-5.97, 26.53], [-5.75, 26.0], [-5.97, 25.47], [-6.5, 25.25], [-6.75, 25.35], [-7.0, 25.25], [-7.53, 25.47], [-7.75, 26.0]]], [[[-10.03, 32.03], [-9.68, 32.18], [-9.53, 32.53], [-9.0, 32.75], [-8.5, 32.54], [-8.0, 32.75], [-7.75, 32.65], [-7.68, 32.68], [-7.53, 33.03], [-7.0, 33.25], [-6.75, 33.15], [-6.68, 33.18], [-6.53, 33.53], [-6.0, 33.75], [-5.47, 33.53], [-5.25, 33.0], [-5.47, 32.47], [-5.82, 32.32], [-5.85, 32.25], [-5.75, 32.0], [-5.97, 31.47], [-6.32, 31.32], [-6.47, 30.97], [-7.0, 30.75], [-7.25, 30.85], [-7.5, 30.75], [-7.75, 30.85], [-8.0, 30.75], [-8.25, 30.85], [-8.32, 30.82], [-8.47, 30.47], [-9.0, 30.25], [-9.53, 30.47], [-9.68, 30.82], [-10.03, 30.97], [-10.25, 31.5], [-10.03, 32.03]]]]}, "2026-04-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-9.53, 32.53], [-9.0, 32.75], [-8.5, 32.54], [-8.0, 32.75], [-7.75, 32.65], [-7.68, 32.68], [-7.53, 33.03], [-7.0, 33.25], [-6.75, 33.15], [-6.68, 33.18], [-6.53, 33.53], [-6.0, 33.75], [-5.47, 33.53], [-5.25, 33.0], [-5.47, 32.47], [-5.82, 32.32], [-5.97, 31.97], [-6.5, 31.75], [-6.75, 31.85], [-6.82, 31.82], [-6.97, 31.47], [-7.5, 31.25], [-7.75, 31.35], [-7.82, 31.32], [-7.97, 30.97], [-8.5, 30.75], [-8.75, 30.85], [-9.0, 30.75], [-9.53, 30.97], [-9.75, 31.5], [-9.65, 31.75], [-9.75, 32.0], [-9.53, 32.53]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -7.269010657025262}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.5971934859589125}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [15.161585998535202, 14.840090688069779, 15.517206349999014, 15.514183061563529, 16.22962662546263, 12.187020799225479, 13.253467814127646]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [14.839418029785179, 7.68927917480471, 6.076387023925804, 4.693255360921228, 3.9780975341797102, 5.590116119384788, 10.45351053873702]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-1.3622470930393207, -2.4942505943931983, -3.597560259113608, -3.744174664111676, -4.827770948596258, -4.529452996814528, -3.888805354258963]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-1.514853978199028, -6.363943545312736, -7.210117018429742, -7.269010657025262, -6.6353507856239275, -5.649794326255744, -4.568455314305197]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3971309638606642, -1.6969973319555214, -1.7984098342471964, -1.7483366210182536, -1.531816221009052, -1.5027887453379711, -1.2973937796012998]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5251308471206397, -2.3541286295846513, -2.9326109222571985, -2.7828584894495862, -2.2387763363223407, -1.7545660145902702, -1.4106830997290944]}}