{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:59:17.411419", "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-26_to_2026-Apr-30_19.0_-33.5"}, "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": 2026040000701}, "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 26 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 30 2026"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 5}, "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": 267939.6685886588}, "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": ["South Africa"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Southern-Africa", "W.Southern-Africa"]}, "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": ["Indian 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": -33.5}, "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": 19.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "19.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 18.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 25.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -34.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -28.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-04-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[17.75, -33.0], [17.97, -32.47], [18.32, -32.32], [18.35, -32.25], [18.25, -32.0], [18.47, -31.47], [19.0, -31.25], [19.53, -31.47], [19.68, -31.82], [20.03, -31.97], [20.25, -32.5], [20.15, -32.75], [20.25, -33.0], [20.15, -33.25], [20.25, -33.5], [20.04, -34.0], [20.25, -34.5], [20.03, -35.03], [19.5, -35.25], [18.97, -35.03], [18.82, -34.68], [18.47, -34.53], [18.25, -34.0], [18.35, -33.75], [18.32, -33.68], [17.97, -33.53], [17.75, -33.0]]]]}, "2026-04-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[17.75, -33.0], [17.97, -32.47], [18.32, -32.32], [18.35, -32.25], [18.25, -32.0], [18.47, -31.47], [19.0, -31.25], [19.25, -31.35], [19.5, -31.25], [19.75, -31.35], [20.0, -31.25], [20.25, -31.35], [20.32, -31.32], [20.35, -31.25], [20.25, -31.0], [20.35, -30.75], [20.25, -30.5], [20.35, -30.25], [20.25, -30.0], [20.47, -29.47], [21.0, -29.25], [21.25, -29.35], [21.5, -29.25], [21.75, -29.35], [22.0, -29.25], [22.25, -29.35], [22.32, -29.32], [22.47, -28.97], [22.82, -28.82], [22.97, -28.47], [23.32, -28.32], [23.47, -27.97], [24.0, -27.75], [24.53, -27.97], [24.68, -28.32], [24.75, -28.35], [25.0, -28.25], [25.53, -28.47], [25.68, -28.82], [26.03, -28.97], [26.25, -29.5], [26.15, -29.75], [26.25, -30.0], [26.15, -30.25], [26.25, -30.5], [26.03, -31.03], [25.68, -31.18], [25.54, -31.5], [25.75, -32.0], [25.53, -32.53], [25.0, -32.75], [24.57, -32.57], [24.68, -32.82], [25.03, -32.97], [25.25, -33.5], [25.03, -34.03], [24.5, -34.25], [24.0, -34.04], [23.5, -34.25], [23.25, -34.15], [23.18, -34.18], [23.03, -34.53], [22.5, -34.75], [22.25, -34.65], [22.0, -34.75], [21.75, -34.65], [21.5, -34.75], [21.25, -34.65], [21.18, -34.68], [21.03, -35.03], [20.5, -35.25], [20.25, -35.15], [20.0, -35.25], [19.75, -35.15], [19.5, -35.25], [18.97, -35.03], [18.82, -34.68], [18.47, -34.53], [18.25, -34.0], [18.35, -33.75], [18.32, -33.68], [17.97, -33.53], [17.75, -33.0]]]]}, "2026-04-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[17.75, -33.0], [17.97, -32.47], [18.32, -32.32], [18.35, -32.25], [18.25, -32.0], [18.47, -31.47], [19.0, -31.25], [19.25, -31.35], [19.5, -31.25], [19.75, -31.35], [20.0, -31.25], [20.25, -31.35], [20.32, -31.32], [20.35, -31.25], [20.25, -31.0], [20.35, -30.75], [20.25, -30.5], [20.35, -30.25], [20.25, -30.0], [20.47, -29.47], [21.0, -29.25], [21.25, -29.35], [21.5, -29.25], [21.75, -29.35], [22.0, -29.25], [22.25, -29.35], [22.32, -29.32], [22.47, -28.97], [22.82, -28.82], [22.97, -28.47], [23.32, -28.32], [23.47, -27.97], [24.0, -27.75], [24.53, -27.97], [24.68, -28.32], [24.75, -28.35], [25.0, -28.25], [25.53, -28.47], [25.68, -28.82], [26.03, -28.97], [26.25, -29.5], [26.15, -29.75], [26.25, -30.0], [26.15, -30.25], [26.25, -30.5], [26.03, -31.03], [25.68, -31.18], [25.54, -31.5], [25.75, -32.0], [25.53, -32.53], [25.0, -32.75], [24.57, -32.57], [24.68, -32.82], [25.03, -32.97], [25.25, -33.5], [25.03, -34.03], [24.5, -34.25], [24.0, -34.04], [23.5, -34.25], [23.25, -34.15], [23.18, -34.18], [23.03, -34.53], [22.5, -34.75], [22.25, -34.65], [22.0, -34.75], [21.75, -34.65], [21.5, -34.75], [21.25, -34.65], [21.18, -34.68], [21.03, -35.03], [20.5, -35.25], [20.25, -35.15], [20.0, -35.25], [19.75, -35.15], [19.5, -35.25], [18.97, -35.03], [18.82, -34.68], [18.47, -34.53], [18.25, -34.0], [18.35, -33.75], [18.32, -33.68], [17.97, -33.53], [17.75, -33.0]]]]}, "2026-04-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[17.75, -33.0], [17.97, -32.47], [18.32, -32.32], [18.47, -31.97], [18.82, -31.82], [18.97, -31.47], [19.5, -31.25], [19.75, -31.35], [20.0, -31.25], [20.25, -31.35], [20.32, -31.32], [20.35, -31.25], [20.25, -31.0], [20.35, -30.75], [20.25, -30.5], [20.35, -30.25], [20.25, -30.0], [20.47, -29.47], [21.0, -29.25], [21.25, -29.35], [21.5, -29.25], [21.75, -29.35], [22.0, -29.25], [22.25, -29.35], [22.32, -29.32], [22.47, -28.97], [22.82, -28.82], [22.97, -28.47], [23.32, -28.32], [23.47, -27.97], [24.0, -27.75], [24.53, -27.97], [24.68, -28.32], [24.75, -28.35], [25.0, -28.25], [25.53, -28.47], [25.68, -28.82], [26.03, -28.97], [26.25, -29.5], [26.15, -29.75], [26.25, -30.0], [26.15, -30.25], [26.25, -30.5], [26.03, -31.03], [25.68, -31.18], [25.54, -31.5], [25.75, -32.0], [25.53, -32.53], [25.0, -32.75], [24.57, -32.57], [24.68, -32.82], [25.03, -32.97], [25.25, -33.5], [25.03, -34.03], [24.5, -34.25], [24.0, -34.04], [23.5, -34.25], [23.25, -34.15], [23.18, -34.18], [23.03, -34.53], [22.5, -34.75], [22.25, -34.65], [22.0, -34.75], [21.75, -34.65], [21.5, -34.75], [21.25, -34.65], [21.18, -34.68], [21.03, -35.03], [20.5, -35.25], [20.25, -35.15], [20.0, -35.25], [19.75, -35.15], [19.5, -35.25], [18.97, -35.03], [18.82, -34.68], [18.47, -34.53], [18.25, -34.0], [18.35, -33.75], [18.32, -33.68], [17.97, -33.53], [17.75, -33.0]]]]}, "2026-04-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[17.97, -32.47], [18.5, -32.25], [19.03, -32.47], [19.18, -32.82], [19.53, -32.97], [19.68, -33.32], [19.75, -33.35], [20.0, -33.25], [20.25, -33.35], [20.5, -33.25], [20.75, -33.35], [21.0, -33.25], [21.25, -33.35], [21.5, -33.25], [22.03, -33.47], [22.25, -34.0], [22.03, -34.53], [21.5, -34.75], [21.25, -34.65], [21.18, -34.68], [21.03, -35.03], [20.5, -35.25], [20.25, -35.15], [20.0, -35.25], [19.75, -35.15], [19.5, -35.25], [18.97, -35.03], [18.82, -34.68], [18.47, -34.53], [18.25, -34.0], [18.35, -33.75], [18.32, -33.68], [17.97, -33.53], [17.75, -33.0], [17.97, -32.47]]], [[[22.97, -28.47], [23.32, -28.32], [23.47, -27.97], [24.0, -27.75], [24.53, -27.97], [24.68, -28.32], [24.75, -28.35], [25.0, -28.25], [25.53, -28.47], [25.75, -29.0], [25.65, -29.25], [25.75, -29.5], [25.53, -30.03], [25.0, -30.25], [24.75, -30.15], [24.5, -30.25], [24.25, -30.15], [24.0, -30.25], [23.47, -30.03], [23.32, -29.68], [22.97, -29.53], [22.75, -29.0], [22.97, -28.47]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -8.032611901012672}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.377118640421456}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [12.026201883951842, 9.707490340089578, 8.823128474615771, 10.497679800939068, 12.15503805060132]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [9.135601298014365, 5.320456441243493, 5.155445353190146, 6.979618326822958, 11.02820485432943]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.827643430882864, -5.659981771822833, -6.377928629425616, -4.562494443547963, -3.5459549196054923]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.691029664323821, -7.889850995523034, -8.032611901012672, -5.790575009743463, -4.647474600445889]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3798328586947393, -1.8747793524204581, -2.1137850742786455, -1.527339214011406, -1.4431818944655919]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.4715372784196583, -2.443128533739091, -2.6771926607511576, -1.8883943771325937, -1.5822820663383852]}}