{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:05:05.017612", "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-May-21_to_2025-May-25_14.0_63.0"}, "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": 2025050000516}, "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": "May 21 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 25 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": 65454.18896304045}, "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": ["Norway", "Sweden"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["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": []}, "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": 63.0}, "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": 14.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "14.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 10.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 16.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 60.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 64.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[9.75, 61.0], [9.97, 61.53], [10.32, 61.68], [10.47, 62.03], [11.0, 62.25], [11.25, 62.15], [11.32, 62.18], [11.47, 62.53], [12.0, 62.75], [12.25, 62.65], [12.32, 62.68], [12.47, 63.03], [13.0, 63.25], [13.25, 63.15], [13.32, 63.18], [13.35, 63.25], [13.25, 63.5], [13.47, 64.03], [14.0, 64.25], [14.25, 64.15], [14.32, 64.18], [14.47, 64.53], [15.0, 64.75], [15.5, 64.54], [16.0, 64.75], [16.25, 64.65], [16.5, 64.75], [17.03, 64.53], [17.25, 64.0], [17.15, 63.75], [17.25, 63.5], [17.15, 63.25], [17.25, 63.0], [17.03, 62.47], [16.5, 62.25], [16.25, 62.35], [16.0, 62.25], [15.75, 62.35], [15.5, 62.25], [15.25, 62.35], [15.0, 62.25], [14.75, 62.35], [14.68, 62.32], [14.65, 62.25], [14.75, 62.0], [14.53, 61.47], [14.18, 61.32], [14.03, 60.97], [13.68, 60.82], [13.65, 60.75], [13.75, 60.5], [13.53, 59.97], [13.18, 59.82], [13.03, 59.47], [12.5, 59.25], [12.25, 59.35], [12.0, 59.25], [11.75, 59.35], [11.5, 59.25], [11.25, 59.35], [11.0, 59.25], [10.47, 59.47], [10.32, 59.82], [9.97, 59.97], [9.75, 60.5], [9.85, 60.75], [9.75, 61.0]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.Europe"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-05-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[13.25, 63.5], [13.47, 64.03], [14.0, 64.25], [14.25, 64.15], [14.32, 64.18], [14.47, 64.53], [15.0, 64.75], [15.5, 64.54], [16.0, 64.75], [16.25, 64.65], [16.5, 64.75], [17.03, 64.53], [17.25, 64.0], [17.15, 63.75], [17.25, 63.5], [17.15, 63.25], [17.25, 63.0], [17.03, 62.47], [16.5, 62.25], [16.25, 62.35], [16.0, 62.25], [15.75, 62.35], [15.5, 62.25], [15.25, 62.35], [15.0, 62.25], [14.75, 62.35], [14.5, 62.25], [14.25, 62.35], [14.0, 62.25], [13.47, 62.47], [13.25, 63.0], [13.35, 63.25], [13.25, 63.5]]]]}, "2025-05-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[9.75, 61.0], [9.97, 61.53], [10.32, 61.68], [10.47, 62.03], [11.0, 62.25], [11.25, 62.15], [11.32, 62.18], [11.47, 62.53], [12.0, 62.75], [12.25, 62.65], [12.32, 62.68], [12.47, 63.03], [13.0, 63.25], [13.25, 63.15], [13.32, 63.18], [13.35, 63.25], [13.25, 63.5], [13.47, 64.03], [14.0, 64.25], [14.25, 64.15], [14.32, 64.18], [14.47, 64.53], [15.0, 64.75], [15.5, 64.54], [16.0, 64.75], [16.25, 64.65], [16.5, 64.75], [17.03, 64.53], [17.25, 64.0], [17.15, 63.75], [17.25, 63.5], [17.15, 63.25], [17.25, 63.0], [17.03, 62.47], [16.5, 62.25], [16.25, 62.35], [16.0, 62.25], [15.75, 62.35], [15.5, 62.25], [15.25, 62.35], [15.0, 62.25], [14.75, 62.35], [14.68, 62.32], [14.65, 62.25], [14.75, 62.0], [14.53, 61.47], [14.18, 61.32], [14.03, 60.97], [13.68, 60.82], [13.65, 60.75], [13.75, 60.5], [13.53, 59.97], [13.18, 59.82], [13.03, 59.47], [12.5, 59.25], [12.25, 59.35], [12.0, 59.25], [11.75, 59.35], [11.5, 59.25], [11.25, 59.35], [11.0, 59.25], [10.47, 59.47], [10.32, 59.82], [9.97, 59.97], [9.75, 60.5], [9.85, 60.75], [9.75, 61.0]]]]}, "2025-05-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[9.75, 61.0], [9.97, 61.53], [10.32, 61.68], [10.47, 62.03], [11.0, 62.25], [11.25, 62.15], [11.32, 62.18], [11.47, 62.53], [12.0, 62.75], [12.25, 62.65], [12.32, 62.68], [12.47, 63.03], [13.0, 63.25], [13.25, 63.15], [13.32, 63.18], [13.35, 63.25], [13.25, 63.5], [13.47, 64.03], [14.0, 64.25], [14.25, 64.15], [14.32, 64.18], [14.47, 64.53], [15.0, 64.75], [15.5, 64.54], [16.0, 64.75], [16.25, 64.65], [16.5, 64.75], [17.03, 64.53], [17.25, 64.0], [17.15, 63.75], [17.25, 63.5], [17.15, 63.25], [17.25, 63.0], [17.03, 62.47], [16.5, 62.25], [16.25, 62.35], [16.0, 62.25], [15.75, 62.35], [15.5, 62.25], [15.25, 62.35], [15.0, 62.25], [14.75, 62.35], [14.68, 62.32], [14.65, 62.25], [14.75, 62.0], [14.53, 61.47], [14.18, 61.32], [14.03, 60.97], [13.68, 60.82], [13.65, 60.75], [13.75, 60.5], [13.53, 59.97], [13.18, 59.82], [13.03, 59.47], [12.5, 59.25], [12.25, 59.35], [12.0, 59.25], [11.75, 59.35], [11.5, 59.25], [11.25, 59.35], [11.0, 59.25], [10.47, 59.47], [10.32, 59.82], [9.97, 59.97], [9.75, 60.5], [9.85, 60.75], [9.75, 61.0]]]]}, "2025-05-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[9.75, 61.0], [9.97, 61.53], [10.32, 61.68], [10.47, 62.03], [11.0, 62.25], [11.25, 62.15], [11.32, 62.18], [11.47, 62.53], [12.0, 62.75], [12.25, 62.65], [12.32, 62.68], [12.47, 63.03], [13.0, 63.25], [13.25, 63.15], [13.32, 63.18], [13.47, 63.53], [14.0, 63.75], [14.53, 63.53], [14.75, 63.0], [14.65, 62.75], [14.75, 62.5], [14.65, 62.25], [14.75, 62.0], [14.53, 61.47], [14.18, 61.32], [14.03, 60.97], [13.68, 60.82], [13.65, 60.75], [13.75, 60.5], [13.53, 59.97], [13.18, 59.82], [13.03, 59.47], [12.5, 59.25], [12.25, 59.35], [12.0, 59.25], [11.75, 59.35], [11.5, 59.25], [11.25, 59.35], [11.0, 59.25], [10.47, 59.47], [10.32, 59.82], [9.97, 59.97], [9.75, 60.5], [9.85, 60.75], [9.75, 61.0]]]]}, "2025-05-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[9.97, 59.97], [9.75, 60.5], [9.97, 61.03], [10.5, 61.25], [11.03, 61.03], [11.18, 60.68], [11.25, 60.65], [11.5, 60.75], [12.03, 60.53], [12.25, 60.0], [12.03, 59.47], [11.5, 59.25], [11.25, 59.35], [11.0, 59.25], [10.47, 59.47], [10.32, 59.82], [9.97, 59.97]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -7.619789920347671}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.362264446602554}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [3.8476442972819314, 3.5916230095757555, 3.4647937350803204, 5.090698906683201, 8.33560375637478]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [2.8416547139485715, 1.011116282145224, 0.7099217732747434, 2.2851844787597884, 7.411829884847009]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.0221543498699095, -5.671082550128047, -5.883601003361327, -4.513317111988611, -3.382950817012462]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.472916904271642, -7.189014293168555, -7.619789920347671, -5.459270384690512, -3.517873180754691]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3214361595872892, -1.5253888073694606, -1.6348367997355815, -1.259197538424386, -1.027341020469278]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.377607808140245, -1.9282425183735437, -2.037895505816366, -1.45794918842346, -1.0581747579348266]}}