{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:08:45.785562", "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-Nov-11_to_2025-Nov-13_332.0_40.0"}, "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": 2025110000353}, "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": "November 11 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "November 13 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 3}, "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": 125602.65168110622}, "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": ["Portugal"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Europe"]}, "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": ["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": 40.0}, "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": 332.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "332.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 330.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 335.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 38.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 42.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-30.53, 41.53], [-30.18, 41.68], [-30.03, 42.03], [-29.5, 42.25], [-29.25, 42.15], [-29.0, 42.25], [-28.75, 42.15], [-28.68, 42.18], [-28.53, 42.53], [-28.0, 42.75], [-27.47, 42.53], [-27.25, 42.0], [-27.35, 41.75], [-27.32, 41.68], [-26.97, 41.53], [-26.8, 41.12], [-26.68, 41.18], [-26.53, 41.53], [-26.0, 41.75], [-25.75, 41.65], [-25.5, 41.75], [-24.97, 41.53], [-24.75, 41.0], [-24.85, 40.75], [-24.75, 40.5], [-24.93, 40.07], [-24.5, 40.25], [-23.97, 40.03], [-23.75, 39.5], [-23.85, 39.25], [-23.75, 39.0], [-23.97, 38.47], [-24.32, 38.32], [-24.47, 37.97], [-25.0, 37.75], [-25.25, 37.85], [-25.5, 37.75], [-26.03, 37.97], [-26.18, 38.32], [-26.25, 38.35], [-26.32, 38.32], [-26.47, 37.97], [-27.0, 37.75], [-27.25, 37.85], [-27.5, 37.75], [-27.75, 37.85], [-28.0, 37.75], [-28.25, 37.85], [-28.5, 37.75], [-29.03, 37.97], [-29.18, 38.32], [-29.53, 38.47], [-29.75, 39.0], [-29.65, 39.25], [-29.75, 39.5], [-29.65, 39.75], [-29.68, 39.82], [-30.03, 39.97], [-30.18, 40.32], [-30.53, 40.47], [-30.75, 41.0], [-30.53, 41.53]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.Atlantic-Ocean"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-11-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-30.529999999999973, 40.47], [-30.75, 41.0], [-30.529999999999973, 41.53], [-30.180000000000007, 41.68], [-30.029999999999973, 42.03], [-29.5, 42.25], [-29.25, 42.15], [-29.0, 42.25], [-28.75, 42.15], [-28.680000000000007, 42.18], [-28.529999999999973, 42.53], [-28.0, 42.75], [-27.470000000000027, 42.53], [-27.25, 42.0], [-27.350000000000023, 41.75], [-27.319999999999993, 41.68], [-26.970000000000027, 41.53], [-26.80000000000001, 41.12], [-26.680000000000007, 41.18], [-26.529999999999973, 41.53], [-26.0, 41.75], [-25.75, 41.65], [-25.5, 41.75], [-24.970000000000027, 41.53], [-24.75, 41.0], [-24.850000000000023, 40.75], [-24.75, 40.5], [-24.930000000000007, 40.07], [-24.5, 40.25], [-23.970000000000027, 40.03], [-23.75, 39.5], [-23.850000000000023, 39.25], [-23.75, 39.0], [-23.970000000000027, 38.47], [-24.319999999999993, 38.32], [-24.470000000000027, 37.97], [-25.0, 37.75], [-25.25, 37.85], [-25.5, 37.75], [-26.029999999999973, 37.97], [-26.180000000000007, 38.32], [-26.25, 38.35], [-26.319999999999993, 38.32], [-26.470000000000027, 37.97], [-27.0, 37.75], [-27.25, 37.85], [-27.5, 37.75], [-27.75, 37.85], [-28.0, 37.75], [-28.25, 37.85], [-28.5, 37.75], [-29.029999999999973, 37.97], [-29.180000000000007, 38.32], [-29.529999999999973, 38.47], [-29.75, 39.0], [-29.649999999999977, 39.25], [-29.75, 39.5], [-29.649999999999977, 39.75], [-29.680000000000007, 39.82], [-30.029999999999973, 39.97], [-30.180000000000007, 40.32], [-30.529999999999973, 40.47]]]]}, "2025-11-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-30.529999999999973, 40.47], [-30.75, 41.0], [-30.529999999999973, 41.53], [-30.180000000000007, 41.68], [-30.029999999999973, 42.03], [-29.5, 42.25], [-29.25, 42.15], [-29.0, 42.25], [-28.75, 42.15], [-28.680000000000007, 42.18], [-28.529999999999973, 42.53], [-28.0, 42.75], [-27.470000000000027, 42.53], [-27.25, 42.0], [-27.350000000000023, 41.75], [-27.319999999999993, 41.68], [-26.970000000000027, 41.53], [-26.80000000000001, 41.12], [-26.680000000000007, 41.18], [-26.529999999999973, 41.53], [-26.0, 41.75], [-25.75, 41.65], [-25.5, 41.75], [-24.970000000000027, 41.53], [-24.75, 41.0], [-24.850000000000023, 40.75], [-24.75, 40.5], [-24.930000000000007, 40.07], [-24.5, 40.25], [-23.970000000000027, 40.03], [-23.75, 39.5], [-23.850000000000023, 39.25], [-23.75, 39.0], [-23.970000000000027, 38.47], [-24.319999999999993, 38.32], [-24.470000000000027, 37.97], [-25.0, 37.75], [-25.25, 37.85], [-25.5, 37.75], [-26.029999999999973, 37.97], [-26.180000000000007, 38.32], [-26.25, 38.35], [-26.319999999999993, 38.32], [-26.470000000000027, 37.97], [-27.0, 37.75], [-27.25, 37.85], [-27.5, 37.75], [-27.75, 37.85], [-28.0, 37.75], [-28.25, 37.85], [-28.5, 37.75], [-29.029999999999973, 37.97], [-29.180000000000007, 38.32], [-29.529999999999973, 38.47], [-29.75, 39.0], [-29.649999999999977, 39.25], [-29.75, 39.5], [-29.649999999999977, 39.75], [-29.680000000000007, 39.82], [-30.029999999999973, 39.97], [-30.180000000000007, 40.32], [-30.529999999999973, 40.47]]]]}, "2025-11-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-30.529999999999973, 40.47], [-30.75, 41.0], [-30.529999999999973, 41.53], [-30.180000000000007, 41.68], [-30.029999999999973, 42.03], [-29.5, 42.25], [-29.25, 42.15], [-29.0, 42.25], [-28.75, 42.15], [-28.680000000000007, 42.18], [-28.529999999999973, 42.53], [-28.0, 42.75], [-27.470000000000027, 42.53], [-27.25, 42.0], [-27.350000000000023, 41.75], [-27.319999999999993, 41.68], [-26.970000000000027, 41.53], [-26.80000000000001, 41.12], [-26.680000000000007, 41.18], [-26.529999999999973, 41.53], [-26.0, 41.75], [-25.75, 41.65], [-25.5, 41.75], [-24.970000000000027, 41.53], [-24.75, 41.0], [-24.850000000000023, 40.75], [-24.75, 40.5], [-24.930000000000007, 40.07], [-24.5, 40.25], [-23.970000000000027, 40.03], [-23.75, 39.5], [-23.850000000000023, 39.25], [-23.75, 39.0], [-23.970000000000027, 38.47], [-24.319999999999993, 38.32], [-24.470000000000027, 37.97], [-25.0, 37.75], [-25.25, 37.85], [-25.5, 37.75], [-26.029999999999973, 37.97], [-26.180000000000007, 38.32], [-26.25, 38.35], [-26.319999999999993, 38.32], [-26.470000000000027, 37.97], [-27.0, 37.75], [-27.25, 37.85], [-27.5, 37.75], [-27.75, 37.85], [-28.0, 37.75], [-28.25, 37.85], [-28.5, 37.75], [-29.029999999999973, 37.97], [-29.180000000000007, 38.32], [-29.529999999999973, 38.47], [-29.75, 39.0], [-29.649999999999977, 39.25], [-29.75, 39.5], [-29.649999999999977, 39.75], [-29.680000000000007, 39.82], [-30.029999999999973, 39.97], [-30.180000000000007, 40.32], [-30.529999999999973, 40.47]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -3.336219809978047}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.554993159936592}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [15.15299528589793, 14.608060071453394, 15.141440040060616]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [13.847536977132165, 14.050667063395224, 14.229295349121116]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.4617844200978554, -2.923525236625891, -2.2796698230860306]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.0476690432491864, -3.336219809978047, -2.6893644407011266]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.6928205773814333, -2.0017254033127663, -1.559295909323387]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.945510845416493, -2.2773870271414083, -1.8624444805802056]}}