{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:59:18.226934", "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": "2026-Apr-30_to_2026-May-02_274.0_43.5"}, "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": 2026040000814}, "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": "April 30 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 02 2026"}, "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": 62952.74783146022}, "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": ["United States"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.North-America"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["North America"]}, "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": 43.5}, "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": 274.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "274.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 272.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 276.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 41.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 45.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-04-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-87.75, 42.5], [-87.65, 42.75], [-87.75, 43.0], [-87.54, 43.5], [-87.75, 44.0], [-87.53, 44.53], [-87.0, 44.75], [-86.75, 44.65], [-86.68, 44.68], [-86.53, 45.03], [-86.0, 45.25], [-85.75, 45.15], [-85.68, 45.18], [-85.53, 45.53], [-85.18, 45.68], [-85.03, 46.03], [-84.5, 46.25], [-83.97, 46.03], [-83.82, 45.68], [-83.47, 45.53], [-83.25, 45.0], [-83.47, 44.47], [-84.0, 44.25], [-84.25, 44.35], [-84.32, 44.32], [-84.35, 44.25], [-84.25, 44.0], [-84.47, 43.47], [-84.82, 43.32], [-84.85, 43.25], [-84.75, 43.0], [-84.85, 42.75], [-84.75, 42.5], [-84.97, 41.97], [-85.32, 41.82], [-85.35, 41.75], [-85.25, 41.5], [-85.47, 40.97], [-86.0, 40.75], [-86.25, 40.85], [-86.5, 40.75], [-86.75, 40.85], [-87.0, 40.75], [-87.25, 40.85], [-87.5, 40.75], [-88.03, 40.97], [-88.25, 41.5], [-88.03, 42.03], [-87.68, 42.18], [-87.65, 42.25], [-87.75, 42.5]]]]}, "2026-05-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-87.75, 42.5], [-87.65, 42.75], [-87.75, 43.0], [-87.54, 43.5], [-87.75, 44.0], [-87.53, 44.53], [-87.0, 44.75], [-86.75, 44.65], [-86.68, 44.68], [-86.53, 45.03], [-86.0, 45.25], [-85.75, 45.15], [-85.68, 45.18], [-85.53, 45.53], [-85.18, 45.68], [-85.03, 46.03], [-84.5, 46.25], [-83.97, 46.03], [-83.82, 45.68], [-83.47, 45.53], [-83.25, 45.0], [-83.47, 44.47], [-84.0, 44.25], [-84.25, 44.35], [-84.32, 44.32], [-84.35, 44.25], [-84.25, 44.0], [-84.47, 43.47], [-84.82, 43.32], [-84.85, 43.25], [-84.75, 43.0], [-84.85, 42.75], [-84.75, 42.5], [-84.97, 41.97], [-85.32, 41.82], [-85.35, 41.75], [-85.25, 41.5], [-85.47, 40.97], [-86.0, 40.75], [-86.25, 40.85], [-86.5, 40.75], [-86.75, 40.85], [-87.0, 40.75], [-87.25, 40.85], [-87.5, 40.75], [-88.03, 40.97], [-88.25, 41.5], [-88.03, 42.03], [-87.68, 42.18], [-87.65, 42.25], [-87.75, 42.5]]]]}, "2026-05-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-87.75, 42.5], [-87.65, 42.75], [-87.75, 43.0], [-87.54, 43.5], [-87.75, 44.0], [-87.53, 44.53], [-87.0, 44.75], [-86.75, 44.65], [-86.68, 44.68], [-86.53, 45.03], [-86.0, 45.25], [-85.75, 45.15], [-85.68, 45.18], [-85.53, 45.53], [-85.18, 45.68], [-85.03, 46.03], [-84.5, 46.25], [-83.97, 46.03], [-83.82, 45.68], [-83.47, 45.53], [-83.25, 45.0], [-83.47, 44.47], [-84.0, 44.25], [-84.25, 44.35], [-84.32, 44.32], [-84.35, 44.25], [-84.25, 44.0], [-84.47, 43.47], [-84.82, 43.32], [-84.85, 43.25], [-84.75, 43.0], [-84.85, 42.75], [-84.75, 42.5], [-84.97, 41.97], [-85.32, 41.82], [-85.35, 41.75], [-85.25, 41.5], [-85.47, 40.97], [-86.0, 40.75], [-86.25, 40.85], [-86.5, 40.75], [-86.75, 40.85], [-87.0, 40.75], [-87.25, 40.85], [-87.5, 40.75], [-88.03, 40.97], [-88.25, 41.5], [-88.03, 42.03], [-87.68, 42.18], [-87.65, 42.25], [-87.75, 42.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -8.278514518318843}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.692233558620764}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [4.885094851539293, 4.1503414699009795, 3.9971530369350035]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [2.204230244954431, 1.8807985941569427, 2.4775927225749115]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.8452405287162845, -5.896449192340165, -6.335010954805843]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.006374149798887, -7.993315314048459, -8.278514518318843]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.32900695895669, -1.606503989809087, -1.6910401477449228]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.4732911241670186, -1.8422500433821383, -2.016258073927044]}}