{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:05:51.241595", "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-Jun-26_to_2025-Jun-30_13.5_-17.5"}, "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": 2025060000872}, "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": "June 26 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "June 30 2025"}, "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": 505457.67088993045}, "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": ["Angola", "Botswana", "Namibia"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Africa", "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": -17.5}, "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": 13.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "13.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 13.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 21.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -23.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -15.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[12.25, -17.5], [12.35, -17.25], [12.25, -17.0], [12.47, -16.47], [12.82, -16.32], [12.97, -15.97], [13.32, -15.82], [13.35, -15.75], [13.25, -15.5], [13.47, -14.97], [14.0, -14.75], [14.5, -14.96], [15.0, -14.75], [15.53, -14.97], [15.68, -15.32], [15.75, -15.35], [16.0, -15.25], [16.25, -15.35], [16.5, -15.25], [16.75, -15.35], [17.0, -15.25], [17.25, -15.35], [17.5, -15.25], [17.75, -15.35], [18.0, -15.25], [18.53, -15.47], [18.75, -16.0], [18.65, -16.25], [18.68, -16.32], [18.75, -16.35], [19.0, -16.25], [19.25, -16.35], [19.5, -16.25], [20.0, -16.46], [20.5, -16.25], [20.75, -16.35], [21.0, -16.25], [21.53, -16.47], [21.75, -17.0], [21.65, -17.25], [21.75, -17.5], [21.65, -17.75], [21.75, -18.0], [21.65, -18.25], [21.68, -18.32], [22.03, -18.47], [22.25, -19.0], [22.03, -19.53], [21.68, -19.68], [21.65, -19.75], [21.75, -20.0], [21.53, -20.53], [21.18, -20.68], [21.03, -21.03], [20.68, -21.18], [20.65, -21.25], [20.75, -21.5], [20.53, -22.03], [20.18, -22.18], [20.03, -22.53], [19.68, -22.68], [19.65, -22.75], [19.75, -23.0], [19.53, -23.53], [19.0, -23.75], [18.75, -23.65], [18.5, -23.75], [18.25, -23.65], [18.0, -23.75], [17.75, -23.65], [17.5, -23.75], [17.25, -23.65], [17.0, -23.75], [16.47, -23.53], [16.32, -23.18], [15.97, -23.03], [15.82, -22.68], [15.47, -22.53], [15.25, -22.0], [15.35, -21.75], [15.25, -21.5], [15.35, -21.25], [15.32, -21.18], [14.97, -21.03], [14.75, -20.5], [14.85, -20.25], [14.82, -20.18], [14.47, -20.03], [14.32, -19.68], [14.25, -19.65], [14.0, -19.75], [13.47, -19.53], [13.32, -19.18], [12.97, -19.03], [12.82, -18.68], [12.47, -18.53], [12.25, -18.0], [12.35, -17.75], [12.25, -17.5]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.Southern-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-06-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[12.47, -18.53], [12.25, -18.0], [12.47, -17.47], [12.82, -17.32], [12.97, -16.97], [13.5, -16.75], [13.75, -16.85], [14.0, -16.75], [14.53, -16.97], [14.75, -17.5], [14.63, -17.8], [14.75, -17.85], [15.0, -17.75], [15.53, -17.97], [15.68, -18.32], [15.75, -18.35], [15.82, -18.32], [15.97, -17.97], [16.5, -17.75], [17.03, -17.97], [17.18, -18.32], [17.25, -18.35], [17.5, -18.25], [18.03, -18.47], [18.25, -19.0], [18.03, -19.53], [17.68, -19.68], [17.65, -19.75], [17.75, -20.0], [17.65, -20.25], [17.68, -20.32], [17.75, -20.35], [18.0, -20.25], [18.53, -20.47], [18.75, -21.0], [18.53, -21.53], [18.18, -21.68], [18.15, -21.75], [18.18, -21.82], [18.5, -21.96], [19.0, -21.75], [19.53, -21.97], [19.75, -22.5], [19.65, -22.75], [19.75, -23.0], [19.53, -23.53], [19.0, -23.75], [18.75, -23.65], [18.5, -23.75], [18.25, -23.65], [18.0, -23.75], [17.75, -23.65], [17.5, -23.75], [17.25, -23.65], [17.0, -23.75], [16.47, -23.53], [16.32, -23.18], [15.97, -23.03], [15.82, -22.68], [15.47, -22.53], [15.25, -22.0], [15.35, -21.75], [15.25, -21.5], [15.35, -21.25], [15.32, -21.18], [14.97, -21.03], [14.75, -20.5], [14.85, -20.25], [14.82, -20.18], [14.47, -20.03], [14.32, -19.68], [14.25, -19.65], [14.0, -19.75], [13.47, -19.53], [13.32, -19.18], [12.97, -19.03], [12.82, -18.68], [12.47, -18.53]]]]}, "2025-06-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[12.25, -17.5], [12.35, -17.25], [12.25, -17.0], [12.47, -16.47], [12.82, -16.32], [12.97, -15.97], [13.32, -15.82], [13.35, -15.75], [13.25, -15.5], [13.47, -14.97], [14.0, -14.75], [14.5, -14.96], [15.0, -14.75], [15.53, -14.97], [15.68, -15.32], [15.75, -15.35], [16.0, -15.25], [16.25, -15.35], [16.5, -15.25], [16.75, -15.35], [17.0, -15.25], [17.25, -15.35], [17.5, -15.25], [17.75, -15.35], [18.0, -15.25], [18.53, -15.47], [18.75, -16.0], [18.65, -16.25], [18.68, -16.32], [18.75, -16.35], [19.0, -16.25], [19.25, -16.35], [19.5, -16.25], [20.0, -16.46], [20.5, -16.25], [20.75, -16.35], [21.0, -16.25], [21.53, -16.47], [21.75, -17.0], [21.65, -17.25], [21.75, -17.5], [21.65, -17.75], [21.75, -18.0], [21.65, -18.25], [21.68, -18.32], [22.03, -18.47], [22.25, -19.0], [22.03, -19.53], [21.68, -19.68], [21.65, -19.75], [21.75, -20.0], [21.53, -20.53], [21.18, -20.68], [21.03, -21.03], [20.68, -21.18], [20.65, -21.25], [20.75, -21.5], [20.53, -22.03], [20.18, -22.18], [20.03, -22.53], [19.68, -22.68], [19.65, -22.75], [19.75, -23.0], [19.53, -23.53], [19.0, -23.75], [18.75, -23.65], [18.5, -23.75], [18.25, -23.65], [18.0, -23.75], [17.75, -23.65], [17.5, -23.75], [17.25, -23.65], [17.0, -23.75], [16.47, -23.53], [16.32, -23.18], [15.97, -23.03], [15.82, -22.68], [15.47, -22.53], [15.25, -22.0], [15.35, -21.75], [15.25, -21.5], [15.35, -21.25], [15.32, -21.18], [14.97, -21.03], [14.75, -20.5], [14.85, -20.25], [14.82, -20.18], [14.47, -20.03], [14.32, -19.68], [14.25, -19.65], [14.0, -19.75], [13.47, -19.53], [13.32, -19.18], [12.97, -19.03], [12.82, -18.68], [12.47, -18.53], [12.25, -18.0], [12.35, -17.75], [12.25, -17.5]]]]}, "2025-06-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[12.25, -17.5], [12.35, -17.25], [12.25, -17.0], [12.47, -16.47], [12.82, -16.32], [12.97, -15.97], [13.32, -15.82], [13.35, -15.75], [13.25, -15.5], [13.47, -14.97], [14.0, -14.75], [14.5, -14.96], [15.0, -14.75], [15.53, -14.97], [15.68, -15.32], [15.75, -15.35], [16.0, -15.25], [16.25, -15.35], [16.5, -15.25], [16.75, -15.35], [17.0, -15.25], [17.25, -15.35], [17.5, -15.25], [17.75, -15.35], [18.0, -15.25], [18.53, -15.47], [18.75, -16.0], [18.65, -16.25], [18.68, -16.32], [18.75, -16.35], [19.0, -16.25], [19.25, -16.35], [19.5, -16.25], [20.0, -16.46], [20.5, -16.25], [20.75, -16.35], [21.0, -16.25], [21.53, -16.47], [21.75, -17.0], [21.65, -17.25], [21.75, -17.5], [21.65, -17.75], [21.75, -18.0], [21.65, -18.25], [21.68, -18.32], [22.03, -18.47], [22.25, -19.0], [22.03, -19.53], [21.68, -19.68], [21.65, -19.75], [21.75, -20.0], [21.53, -20.53], [21.18, -20.68], [21.03, -21.03], [20.68, -21.18], [20.65, -21.25], [20.75, -21.5], [20.53, -22.03], [20.18, -22.18], [20.03, -22.53], [19.68, -22.68], [19.65, -22.75], [19.75, -23.0], [19.53, -23.53], [19.0, -23.75], [18.75, -23.65], [18.5, -23.75], [18.25, -23.65], [18.0, -23.75], [17.75, -23.65], [17.5, -23.75], [17.25, -23.65], [17.0, -23.75], [16.47, -23.53], [16.32, -23.18], [15.97, -23.03], [15.82, -22.68], [15.47, -22.53], [15.25, -22.0], [15.35, -21.75], [15.25, -21.5], [15.35, -21.25], [15.32, -21.18], [14.97, -21.03], [14.75, -20.5], [14.85, -20.25], [14.82, -20.18], [14.47, -20.03], [14.32, -19.68], [14.25, -19.65], [14.0, -19.75], [13.47, -19.53], [13.32, -19.18], [12.97, -19.03], [12.82, -18.68], [12.47, -18.53], [12.25, -18.0], [12.35, -17.75], [12.25, -17.5]]]]}, "2025-06-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[12.25, -17.0], [12.47, -16.47], [12.82, -16.32], [12.97, -15.97], [13.32, -15.82], [13.35, -15.75], [13.25, -15.5], [13.47, -14.97], [14.0, -14.75], [14.5, -14.96], [15.0, -14.75], [15.53, -14.97], [15.68, -15.32], [15.75, -15.35], [16.0, -15.25], [16.25, -15.35], [16.5, -15.25], [16.75, -15.35], [17.0, -15.25], [17.25, -15.35], [17.5, -15.25], [17.75, -15.35], [18.0, -15.25], [18.53, -15.47], [18.75, -16.0], [18.65, -16.25], [18.68, -16.32], [18.75, -16.35], [19.0, -16.25], [19.25, -16.35], [19.5, -16.25], [20.0, -16.46], [20.5, -16.25], [20.75, -16.35], [21.0, -16.25], [21.53, -16.47], [21.75, -17.0], [21.65, -17.25], [21.75, -17.5], [21.65, -17.75], [21.75, -18.0], [21.65, -18.25], [21.68, -18.32], [22.03, -18.47], [22.25, -19.0], [22.03, -19.53], [21.68, -19.68], [21.65, -19.75], [21.75, -20.0], [21.53, -20.53], [21.18, -20.68], [21.03, -21.03], [20.68, -21.18], [20.65, -21.25], [20.75, -21.5], [20.53, -22.03], [20.18, -22.18], [20.03, -22.53], [19.5, -22.75], [19.25, -22.65], [19.0, -22.75], [18.75, -22.65], [18.5, -22.75], [18.0, -22.54], [17.5, -22.75], [17.25, -22.65], [17.0, -22.75], [16.75, -22.65], [16.5, -22.75], [15.97, -22.53], [15.75, -22.0], [15.85, -21.75], [15.75, -21.5], [15.85, -21.25], [15.75, -21.0], [15.88, -20.7], [15.47, -20.53], [15.32, -20.18], [14.97, -20.03], [14.75, -19.5], [14.85, -19.25], [14.8, -19.12], [14.5, -19.25], [13.97, -19.03], [13.82, -18.68], [13.75, -18.65], [13.5, -18.75], [12.97, -18.53], [12.82, -18.18], [12.47, -18.03], [12.25, -17.5], [12.35, -17.25], [12.25, -17.0]]]]}, "2025-06-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[12.47, -18.03], [12.25, -17.5], [12.47, -16.97], [12.82, -16.82], [12.85, -16.75], [12.75, -16.5], [12.97, -15.97], [13.32, -15.82], [13.35, -15.75], [13.25, -15.5], [13.47, -14.97], [14.0, -14.75], [14.53, -14.97], [14.68, -15.32], [15.03, -15.47], [15.25, -16.0], [15.15, -16.25], [15.25, -16.5], [15.15, -16.75], [15.25, -17.0], [15.15, -17.25], [15.25, -17.5], [15.03, -18.03], [14.5, -18.25], [14.25, -18.15], [14.18, -18.18], [14.03, -18.53], [13.5, -18.75], [12.97, -18.53], [12.82, -18.18], [12.47, -18.03]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -7.423974403534828}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.864064855353339}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [11.709668347820582, 12.030228363801598, 12.302733453298629, 13.331603639619914, 16.312927863711423]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [6.72690099080404, 5.560767110188806, 6.784546152750693, 8.665230051676474, 15.337033843994163]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.066323379972909, -4.357904646117927, -4.069341195149078, -3.130677825000759, -2.2122425768110605]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-7.347755561151644, -7.423974403534828, -5.89912291652206, -4.794825458172113, -2.7428562785189]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-2.01937867779423, -2.1670775197884526, -1.901349019497817, -1.4578893225218108, -1.3504948966138497]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-3.1066660944206586, -3.0424714801545236, -2.4351019164140726, -2.1167575757836783, -1.5879456313556273]}}