{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:08:49.870846", "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-20_to_2025-Nov-24_8.5_51.0"}, "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": 2025110000588}, "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 20 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "November 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": 290438.5777462097}, "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": ["Czechia", "Germany", "Poland"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Europe", "Europe", "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": ["Baltic 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": 51.0}, "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": 8.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "8.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 7.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 18.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 48.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 54.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[16.75, 50.5], [16.53, 49.97], [16.0, 49.75], [15.75, 49.85], [15.5, 49.75], [14.97, 49.97], [14.82, 50.32], [14.75, 50.35], [14.68, 50.32], [14.65, 50.25], [14.75, 50.0], [14.53, 49.47], [14.18, 49.32], [14.03, 48.97], [13.5, 48.75], [13.2, 48.88], [13.03, 48.47], [12.68, 48.32], [12.53, 47.97], [12.0, 47.75], [11.75, 47.85], [11.5, 47.75], [11.25, 47.85], [11.0, 47.75], [10.47, 47.97], [10.32, 48.32], [10.25, 48.35], [10.0, 48.25], [9.75, 48.35], [9.5, 48.25], [9.25, 48.35], [9.0, 48.25], [8.47, 48.47], [8.32, 48.82], [8.25, 48.85], [8.0, 48.75], [7.47, 48.97], [7.25, 49.5], [7.35, 49.75], [7.32, 49.82], [6.97, 49.97], [6.82, 50.32], [6.47, 50.47], [6.25, 51.0], [6.47, 51.53], [7.0, 51.75], [7.25, 51.65], [7.32, 51.68], [7.47, 52.03], [8.0, 52.25], [8.25, 52.15], [8.32, 52.18], [8.35, 52.25], [8.25, 52.5], [8.35, 52.75], [8.25, 53.0], [8.47, 53.53], [9.0, 53.75], [9.25, 53.65], [9.32, 53.68], [9.47, 54.03], [10.0, 54.25], [10.25, 54.15], [10.5, 54.25], [10.75, 54.15], [11.0, 54.25], [11.25, 54.15], [11.5, 54.25], [11.75, 54.15], [11.82, 54.18], [11.97, 54.53], [12.32, 54.68], [12.47, 55.03], [13.0, 55.25], [13.53, 55.03], [13.75, 54.5], [13.65, 54.25], [13.75, 54.0], [13.65, 53.75], [13.68, 53.68], [13.75, 53.65], [14.0, 53.75], [14.25, 53.65], [14.5, 53.75], [14.75, 53.65], [14.88, 53.7], [14.75, 54.0], [14.97, 54.53], [15.5, 54.75], [15.75, 54.65], [16.0, 54.75], [16.25, 54.65], [16.5, 54.75], [16.75, 54.65], [16.82, 54.68], [16.97, 55.03], [17.5, 55.25], [17.75, 55.15], [18.0, 55.25], [18.53, 55.03], [18.75, 54.5], [18.54, 54.0], [18.75, 53.5], [18.53, 52.97], [18.0, 52.75], [17.75, 52.85], [17.5, 52.75], [17.25, 52.85], [17.18, 52.82], [17.15, 52.75], [17.25, 52.5], [17.03, 51.97], [16.5, 51.75], [16.07, 51.93], [16.25, 51.5], [16.15, 51.25], [16.18, 51.18], [16.53, 51.03], [16.75, 50.5]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.Europe", "West&Central-Europe"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-11-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[7.97, 52.03], [8.5, 52.25], [9.03, 52.03], [9.25, 51.5], [9.15, 51.25], [9.25, 51.0], [9.03, 50.47], [8.5, 50.25], [8.25, 50.35], [8.0, 50.25], [7.47, 50.47], [7.25, 51.0], [7.47, 51.53], [7.82, 51.68], [7.97, 52.03]]]]}, "2025-11-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[6.47, 50.47], [6.25, 51.0], [6.47, 51.53], [7.0, 51.75], [7.25, 51.65], [7.32, 51.68], [7.47, 52.03], [8.0, 52.25], [8.25, 52.15], [8.32, 52.18], [8.35, 52.25], [8.25, 52.5], [8.35, 52.75], [8.25, 53.0], [8.47, 53.53], [9.0, 53.75], [9.25, 53.65], [9.32, 53.68], [9.47, 54.03], [10.0, 54.25], [10.25, 54.15], [10.5, 54.25], [10.75, 54.15], [11.0, 54.25], [11.25, 54.15], [11.5, 54.25], [11.75, 54.15], [11.82, 54.18], [11.97, 54.53], [12.5, 54.75], [12.75, 54.65], [13.0, 54.75], [13.53, 54.53], [13.75, 54.0], [13.65, 53.75], [13.68, 53.68], [13.75, 53.65], [14.0, 53.75], [14.25, 53.65], [14.5, 53.75], [14.75, 53.65], [15.0, 53.75], [15.53, 53.53], [15.68, 53.18], [16.03, 53.03], [16.25, 52.5], [16.04, 52.0], [16.25, 51.5], [16.15, 51.25], [16.25, 51.0], [16.03, 50.47], [15.5, 50.25], [15.25, 50.35], [15.0, 50.25], [14.75, 50.35], [14.68, 50.32], [14.65, 50.25], [14.75, 50.0], [14.53, 49.47], [14.18, 49.32], [14.03, 48.97], [13.5, 48.75], [13.2, 48.88], [13.03, 48.47], [12.68, 48.32], [12.53, 47.97], [12.0, 47.75], [11.75, 47.85], [11.5, 47.75], [11.25, 47.85], [11.0, 47.75], [10.47, 47.97], [10.32, 48.32], [10.25, 48.35], [10.0, 48.25], [9.75, 48.35], [9.5, 48.25], [9.25, 48.35], [9.0, 48.25], [8.47, 48.47], [8.32, 48.82], [8.25, 48.85], [8.0, 48.75], [7.47, 48.97], [7.25, 49.5], [7.35, 49.75], [7.32, 49.82], [6.97, 49.97], [6.82, 50.32], [6.47, 50.47]]]]}, "2025-11-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[6.47, 50.47], [6.25, 51.0], [6.47, 51.53], [7.0, 51.75], [7.25, 51.65], [7.32, 51.68], [7.47, 52.03], [8.0, 52.25], [8.25, 52.15], [8.32, 52.18], [8.35, 52.25], [8.25, 52.5], [8.35, 52.75], [8.25, 53.0], [8.47, 53.53], [9.0, 53.75], [9.25, 53.65], [9.32, 53.68], [9.47, 54.03], [10.0, 54.25], [10.25, 54.15], [10.5, 54.25], [10.75, 54.15], [11.0, 54.25], [11.25, 54.15], [11.5, 54.25], [11.75, 54.15], [11.82, 54.18], [11.97, 54.53], [12.32, 54.68], [12.47, 55.03], [13.0, 55.25], [13.53, 55.03], [13.75, 54.5], [13.65, 54.25], [13.75, 54.0], [13.65, 53.75], [13.68, 53.68], [13.75, 53.65], [14.0, 53.75], [14.25, 53.65], [14.5, 53.75], [14.75, 53.65], [14.88, 53.7], [14.75, 54.0], [14.97, 54.53], [15.5, 54.75], [15.75, 54.65], [16.0, 54.75], [16.25, 54.65], [16.5, 54.75], [16.75, 54.65], [16.82, 54.68], [16.97, 55.03], [17.5, 55.25], [17.75, 55.15], [18.0, 55.25], [18.53, 55.03], [18.75, 54.5], [18.54, 54.0], [18.75, 53.5], [18.53, 52.97], [18.0, 52.75], [17.75, 52.85], [17.5, 52.75], [17.25, 52.85], [17.18, 52.82], [17.15, 52.75], [17.25, 52.5], [17.03, 51.97], [16.5, 51.75], [16.07, 51.93], [16.25, 51.5], [16.15, 51.25], [16.18, 51.18], [16.53, 51.03], [16.75, 50.5], [16.53, 49.97], [16.0, 49.75], [15.75, 49.85], [15.5, 49.75], [14.97, 49.97], [14.82, 50.32], [14.75, 50.35], [14.68, 50.32], [14.65, 50.25], [14.75, 50.0], [14.53, 49.47], [14.18, 49.32], [14.03, 48.97], [13.5, 48.75], [13.2, 48.88], [13.03, 48.47], [12.68, 48.32], [12.53, 47.97], [12.0, 47.75], [11.75, 47.85], [11.5, 47.75], [11.25, 47.85], [11.0, 47.75], [10.47, 47.97], [10.32, 48.32], [10.25, 48.35], [10.0, 48.25], [9.75, 48.35], [9.5, 48.25], [9.25, 48.35], [9.0, 48.25], [8.47, 48.47], [8.32, 48.82], [8.25, 48.85], [8.0, 48.75], [7.47, 48.97], [7.25, 49.5], [7.35, 49.75], [7.32, 49.82], [6.97, 49.97], [6.82, 50.32], [6.47, 50.47]]]]}, "2025-11-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[6.47, 50.47], [6.25, 51.0], [6.47, 51.53], [7.0, 51.75], [7.25, 51.65], [7.32, 51.68], [7.47, 52.03], [8.0, 52.25], [8.25, 52.15], [8.32, 52.18], [8.35, 52.25], [8.25, 52.5], [8.35, 52.75], [8.25, 53.0], [8.47, 53.53], [9.0, 53.75], [9.25, 53.65], [9.32, 53.68], [9.47, 54.03], [10.0, 54.25], [10.25, 54.15], [10.5, 54.25], [10.75, 54.15], [11.0, 54.25], [11.25, 54.15], [11.5, 54.25], [11.75, 54.15], [11.82, 54.18], [11.97, 54.53], [12.32, 54.68], [12.47, 55.03], [13.0, 55.25], [13.53, 55.03], [13.75, 54.5], [13.65, 54.25], [13.75, 54.0], [13.65, 53.75], [13.68, 53.68], [13.75, 53.65], [14.0, 53.75], [14.25, 53.65], [14.5, 53.75], [14.75, 53.65], [14.88, 53.7], [14.75, 54.0], [14.97, 54.53], [15.5, 54.75], [15.75, 54.65], [16.0, 54.75], [16.25, 54.65], [16.5, 54.75], [16.75, 54.65], [16.82, 54.68], [16.97, 55.03], [17.5, 55.25], [17.75, 55.15], [18.0, 55.25], [18.53, 55.03], [18.75, 54.5], [18.54, 54.0], [18.75, 53.5], [18.53, 52.97], [18.0, 52.75], [17.75, 52.85], [17.5, 52.75], [17.25, 52.85], [17.18, 52.82], [17.15, 52.75], [17.25, 52.5], [17.03, 51.97], [16.5, 51.75], [16.07, 51.93], [16.25, 51.5], [16.15, 51.25], [16.18, 51.18], [16.53, 51.03], [16.75, 50.5], [16.53, 49.97], [16.0, 49.75], [15.75, 49.85], [15.5, 49.75], [14.97, 49.97], [14.82, 50.32], [14.75, 50.35], [14.68, 50.32], [14.65, 50.25], [14.75, 50.0], [14.53, 49.47], [14.18, 49.32], [14.03, 48.97], [13.5, 48.75], [13.2, 48.88], [13.03, 48.47], [12.68, 48.32], [12.53, 47.97], [12.0, 47.75], [11.75, 47.85], [11.5, 47.75], [11.25, 47.85], [11.0, 47.75], [10.47, 47.97], [10.32, 48.32], [10.25, 48.35], [10.0, 48.25], [9.75, 48.35], [9.5, 48.25], [9.25, 48.35], [9.0, 48.25], [8.47, 48.47], [8.32, 48.82], [8.25, 48.85], [8.0, 48.75], [7.47, 48.97], [7.25, 49.5], [7.35, 49.75], [7.32, 49.82], [6.97, 49.97], [6.82, 50.32], [6.47, 50.47]]]]}, "2025-11-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[14.97, 49.97], [14.75, 50.5], [14.97, 51.03], [15.5, 51.25], [15.75, 51.15], [16.0, 51.25], [16.53, 51.03], [16.75, 50.5], [16.53, 49.97], [16.0, 49.75], [15.75, 49.85], [15.5, 49.75], [14.97, 49.97]]], [[[13.75, 53.0], [13.97, 53.53], [14.5, 53.75], [14.75, 53.65], [14.88, 53.7], [14.75, 54.0], [14.97, 54.53], [15.5, 54.75], [15.75, 54.65], [16.0, 54.75], [16.25, 54.65], [16.5, 54.75], [16.75, 54.65], [16.82, 54.68], [16.97, 55.03], [17.5, 55.25], [17.75, 55.15], [18.0, 55.25], [18.53, 55.03], [18.75, 54.5], [18.54, 54.0], [18.75, 53.5], [18.53, 52.97], [18.0, 52.75], [17.75, 52.85], [17.5, 52.75], [17.25, 52.85], [17.18, 52.82], [17.15, 52.75], [17.25, 52.5], [17.03, 51.97], [16.5, 51.75], [15.97, 51.97], [15.82, 52.32], [15.75, 52.35], [15.5, 52.25], [15.25, 52.35], [15.0, 52.25], [14.75, 52.35], [14.5, 52.25], [13.97, 52.47], [13.75, 53.0]]], [[[12.47, 53.97], [12.25, 54.5], [12.47, 55.03], [13.0, 55.25], [13.53, 55.03], [13.75, 54.5], [13.53, 53.97], [13.0, 53.75], [12.47, 53.97]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -11.25238002250984}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -6.446121152205317}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-1.380740865071573, -2.6009735878066635, -3.399172303323951, -3.8125161497271733, -2.144701567150207]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-1.9036087036132585, -7.3632034301757585, -8.075661722819007, -11.020919545491495, -3.4239868164062273]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.600432233422491, -6.074877475385482, -6.637779092183512, -6.872959965665853, -4.596036501125217]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.782716873255708, -10.181780694343104, -10.122099110321756, -11.25238002250984, -5.788500098867985]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.2416452232976551, -1.6502595142897245, -1.8040842979428584, -1.8757775517307285, -1.2674021182559505]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.2893135481669564, -2.722107933679591, -2.757349550347393, -2.8949604355724428, -1.5837674434346012]}}