{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:07:39.910178", "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-20_to_2025-Sep-24_351.0_53.5"}, "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": 2025090000545}, "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 20 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 24 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": 52384.38857996358}, "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": ["Ireland"]}, "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", "Irish Sea"]}, "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": 53.5}, "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": 351.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "351.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 349.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 353.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 51.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 54.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-7.97, 51.47], [-8.32, 51.32], [-8.47, 50.97], [-9.0, 50.75], [-9.25, 50.85], [-9.5, 50.75], [-10.03, 50.97], [-10.18, 51.32], [-10.25, 51.35], [-10.5, 51.25], [-11.03, 51.47], [-11.25, 52.0], [-11.03, 52.53], [-10.68, 52.68], [-10.54, 53.0], [-10.75, 53.5], [-10.65, 53.75], [-10.75, 54.0], [-10.53, 54.53], [-10.0, 54.75], [-9.75, 54.65], [-9.5, 54.75], [-9.25, 54.65], [-9.0, 54.75], [-8.47, 54.53], [-8.32, 54.18], [-7.97, 54.03], [-7.82, 53.68], [-7.75, 53.65], [-7.5, 53.75], [-7.25, 53.65], [-7.0, 53.75], [-6.75, 53.65], [-6.5, 53.75], [-5.97, 53.53], [-5.75, 53.0], [-5.85, 52.75], [-5.75, 52.5], [-5.97, 51.97], [-6.5, 51.75], [-6.75, 51.85], [-7.0, 51.75], [-7.25, 51.85], [-7.5, 51.75], [-7.75, 51.85], [-7.82, 51.82], [-7.97, 51.47]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.Europe", "N.Atlantic-Ocean"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-09-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-10.54000000000002, 53.0], [-10.75, 53.5], [-10.649999999999977, 53.75], [-10.75, 54.0], [-10.529999999999973, 54.53], [-10.0, 54.75], [-9.75, 54.65], [-9.5, 54.75], [-9.25, 54.65], [-9.0, 54.75], [-8.470000000000027, 54.53], [-8.319999999999993, 54.18], [-7.970000000000027, 54.03], [-7.75, 53.5], [-7.970000000000027, 52.97], [-8.5, 52.75], [-8.75, 52.85], [-8.870000000000005, 52.8], [-8.75, 52.5], [-8.970000000000027, 51.97], [-9.319999999999993, 51.82], [-9.470000000000027, 51.47], [-10.0, 51.25], [-10.25, 51.35], [-10.5, 51.25], [-11.029999999999973, 51.47], [-11.25, 52.0], [-11.029999999999973, 52.53], [-10.680000000000007, 52.68], [-10.54000000000002, 53.0]]]]}, "2025-09-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-10.54000000000002, 53.0], [-10.75, 53.5], [-10.649999999999977, 53.75], [-10.75, 54.0], [-10.529999999999973, 54.53], [-10.0, 54.75], [-9.75, 54.65], [-9.5, 54.75], [-9.25, 54.65], [-9.0, 54.75], [-8.470000000000027, 54.53], [-8.319999999999993, 54.18], [-7.970000000000027, 54.03], [-7.819999999999993, 53.68], [-7.75, 53.65], [-7.5, 53.75], [-7.25, 53.65], [-7.0, 53.75], [-6.75, 53.65], [-6.5, 53.75], [-5.970000000000027, 53.53], [-5.75, 53.0], [-5.850000000000023, 52.75], [-5.75, 52.5], [-5.970000000000027, 51.97], [-6.5, 51.75], [-6.75, 51.85], [-7.0, 51.75], [-7.25, 51.85], [-7.5, 51.75], [-7.75, 51.85], [-7.819999999999993, 51.82], [-7.970000000000027, 51.47], [-8.319999999999993, 51.32], [-8.470000000000027, 50.97], [-9.0, 50.75], [-9.25, 50.85], [-9.5, 50.75], [-10.029999999999973, 50.97], [-10.180000000000007, 51.32], [-10.25, 51.35], [-10.5, 51.25], [-11.029999999999973, 51.47], [-11.25, 52.0], [-11.029999999999973, 52.53], [-10.680000000000007, 52.68], [-10.54000000000002, 53.0]]]]}, "2025-09-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-10.54000000000002, 53.0], [-10.75, 53.5], [-10.649999999999977, 53.75], [-10.75, 54.0], [-10.529999999999973, 54.53], [-10.0, 54.75], [-9.75, 54.65], [-9.5, 54.75], [-9.25, 54.65], [-9.0, 54.75], [-8.470000000000027, 54.53], [-8.319999999999993, 54.18], [-7.970000000000027, 54.03], [-7.819999999999993, 53.68], [-7.75, 53.65], [-7.5, 53.75], [-7.25, 53.65], [-7.0, 53.75], [-6.75, 53.65], [-6.5, 53.75], [-5.970000000000027, 53.53], [-5.75, 53.0], [-5.850000000000023, 52.75], [-5.75, 52.5], [-5.970000000000027, 51.97], [-6.5, 51.75], [-6.75, 51.85], [-7.0, 51.75], [-7.25, 51.85], [-7.5, 51.75], [-7.75, 51.85], [-7.819999999999993, 51.82], [-7.970000000000027, 51.47], [-8.319999999999993, 51.32], [-8.470000000000027, 50.97], [-9.0, 50.75], [-9.25, 50.85], [-9.5, 50.75], [-10.029999999999973, 50.97], [-10.180000000000007, 51.32], [-10.25, 51.35], [-10.5, 51.25], [-11.029999999999973, 51.47], [-11.25, 52.0], [-11.029999999999973, 52.53], [-10.680000000000007, 52.68], [-10.54000000000002, 53.0]]]]}, "2025-09-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-10.529999999999973, 51.47], [-10.75, 52.0], [-10.529999999999973, 52.53], [-10.180000000000007, 52.68], [-10.04000000000002, 53.0], [-10.25, 53.5], [-10.149999999999977, 53.75], [-10.25, 54.0], [-10.029999999999973, 54.53], [-9.5, 54.75], [-9.25, 54.65], [-9.0, 54.75], [-8.470000000000027, 54.53], [-8.25, 54.0], [-8.350000000000023, 53.75], [-8.319999999999993, 53.68], [-8.25, 53.65], [-8.0, 53.75], [-7.75, 53.65], [-7.5, 53.75], [-7.25, 53.65], [-7.0, 53.75], [-6.75, 53.65], [-6.5, 53.75], [-5.970000000000027, 53.53], [-5.75, 53.0], [-5.850000000000023, 52.75], [-5.75, 52.5], [-5.970000000000027, 51.97], [-6.5, 51.75], [-6.75, 51.85], [-7.0, 51.75], [-7.25, 51.85], [-7.5, 51.75], [-7.75, 51.85], [-7.819999999999993, 51.82], [-7.970000000000027, 51.47], [-8.319999999999993, 51.32], [-8.470000000000027, 50.97], [-9.0, 50.75], [-9.25, 50.85], [-9.5, 50.75], [-10.029999999999973, 50.97], [-10.180000000000007, 51.32], [-10.529999999999973, 51.47]]]]}, "2025-09-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-8.529999999999973, 53.03], [-8.0, 53.25], [-7.470000000000027, 53.03], [-7.25, 52.5], [-7.470000000000027, 51.97], [-8.0, 51.75], [-8.529999999999973, 51.97], [-8.75, 52.5], [-8.529999999999973, 53.03]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.752678048042242}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.3936290821815103}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [10.617246708725474, 9.342796579996786, 8.773916407993909, 9.434116120269323, 9.088897959391318]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [9.540845489501976, 8.412742869059286, 7.626318868001306, 8.363520558675134, 9.088897959391318]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.492925556116404, -3.511581194364944, -3.954382316759478, -3.0263419187455476, -2.7452229186055774]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.080379276711369, -3.948250315557175, -4.752678048042242, -3.523812954302116, -2.7452229186055774]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5276789029455846, -2.1006852859839293, -2.3068818760904515, -1.6363104465398741, -1.336018251683592]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.7274519650154914, -2.447246737293463, -2.5841773600000795, -1.8997660963407288, -1.336018251683592]}}