{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:56:14.792893", "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-Jul-31_to_2025-Aug-03_276.5_41.5"}, "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": 2025070001108}, "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": "July 31 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 03 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 4}, "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": 70247.42967946241}, "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": 41.5}, "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": 276.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "276.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 274.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 279.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 39.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 42.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-07-31T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-83.5, 42.75], [-82.97, 42.53], [-82.82, 42.18], [-82.47, 42.03], [-82.25, 41.5], [-82.47, 40.97], [-83.0, 40.75], [-83.25, 40.85], [-83.5, 40.75], [-83.75, 40.85], [-84.0, 40.75], [-84.53, 40.97], [-84.75, 41.5], [-84.53, 42.03], [-84.18, 42.18], [-84.03, 42.53], [-83.5, 42.75]]]]}, "2025-08-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-85.18, 41.18], [-85.03, 41.53], [-84.68, 41.68], [-84.53, 42.03], [-84.18, 42.18], [-84.03, 42.53], [-83.5, 42.75], [-82.97, 42.53], [-82.82, 42.18], [-82.47, 42.03], [-82.32, 41.68], [-82.25, 41.65], [-82.18, 41.68], [-82.03, 42.03], [-81.5, 42.25], [-81.25, 42.15], [-81.0, 42.25], [-80.47, 42.03], [-80.32, 41.68], [-79.97, 41.53], [-79.75, 41.0], [-79.97, 40.47], [-80.5, 40.25], [-80.75, 40.35], [-80.82, 40.32], [-80.97, 39.97], [-81.5, 39.75], [-81.75, 39.85], [-81.82, 39.82], [-81.97, 39.47], [-82.5, 39.25], [-82.75, 39.35], [-83.0, 39.25], [-83.25, 39.35], [-83.5, 39.25], [-83.75, 39.35], [-84.0, 39.25], [-84.25, 39.35], [-84.5, 39.25], [-84.75, 39.35], [-85.0, 39.25], [-85.25, 39.35], [-85.5, 39.25], [-86.03, 39.47], [-86.25, 40.0], [-86.03, 40.53], [-85.68, 40.68], [-85.53, 41.03], [-85.18, 41.18]]]]}, "2025-08-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-85.18, 41.18], [-85.03, 41.53], [-84.68, 41.68], [-84.53, 42.03], [-84.18, 42.18], [-84.03, 42.53], [-83.5, 42.75], [-82.97, 42.53], [-82.82, 42.18], [-82.47, 42.03], [-82.32, 41.68], [-82.25, 41.65], [-82.18, 41.68], [-82.03, 42.03], [-81.5, 42.25], [-81.25, 42.15], [-81.0, 42.25], [-80.47, 42.03], [-80.32, 41.68], [-79.97, 41.53], [-79.75, 41.0], [-79.97, 40.47], [-80.5, 40.25], [-80.75, 40.35], [-80.82, 40.32], [-80.97, 39.97], [-81.5, 39.75], [-81.75, 39.85], [-81.82, 39.82], [-81.97, 39.47], [-82.5, 39.25], [-82.75, 39.35], [-83.0, 39.25], [-83.25, 39.35], [-83.5, 39.25], [-83.75, 39.35], [-84.0, 39.25], [-84.25, 39.35], [-84.5, 39.25], [-84.75, 39.35], [-85.0, 39.25], [-85.25, 39.35], [-85.5, 39.25], [-86.03, 39.47], [-86.25, 40.0], [-86.03, 40.53], [-85.68, 40.68], [-85.53, 41.03], [-85.18, 41.18]]]]}, "2025-08-03T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-85.18, 41.18], [-85.03, 41.53], [-84.68, 41.68], [-84.53, 42.03], [-84.18, 42.18], [-84.03, 42.53], [-83.5, 42.75], [-82.97, 42.53], [-82.75, 42.0], [-82.85, 41.75], [-82.82, 41.68], [-82.75, 41.65], [-82.5, 41.75], [-82.25, 41.65], [-82.18, 41.68], [-82.03, 42.03], [-81.5, 42.25], [-81.25, 42.15], [-81.0, 42.25], [-80.47, 42.03], [-80.32, 41.68], [-79.97, 41.53], [-79.75, 41.0], [-79.97, 40.47], [-80.5, 40.25], [-80.75, 40.35], [-80.82, 40.32], [-80.97, 39.97], [-81.5, 39.75], [-81.75, 39.85], [-81.82, 39.82], [-81.97, 39.47], [-82.5, 39.25], [-82.75, 39.35], [-83.0, 39.25], [-83.25, 39.35], [-83.5, 39.25], [-83.75, 39.35], [-84.0, 39.25], [-84.25, 39.35], [-84.5, 39.25], [-84.75, 39.35], [-85.0, 39.25], [-85.25, 39.35], [-85.5, 39.25], [-86.03, 39.47], [-86.25, 40.0], [-86.03, 40.53], [-85.68, 40.68], [-85.53, 41.03], [-85.18, 41.18]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.626464534454499}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.043956126213608}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [19.336715952555323, 18.959823777940528, 18.54553578694663, 18.78150114739077]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [18.76870244344076, 17.655564880371116, 17.439912414550804, 18.05619583129885]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.756958078536485, -3.8663683364443386, -4.283312443046777, -4.019643587551247]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.234204952494736, -4.216633982625467, -4.6000393336408365, -4.626464534454499]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4202977666097112, -1.474837161812003, -1.6550838833996848, -1.5593721480080516]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5749594603160948, -1.6553883043569853, -1.78138911578655, -1.7580004012102124]}}