{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:59:34.598045", "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-May-18_to_2026-May-20_260.5_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": 2026050000418}, "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 18 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 20 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": 54869.436726296946}, "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": ["C.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": 260.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "260.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 259.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 262.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 40.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 44.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-05-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-101.03, 41.53], [-100.5, 41.75], [-100.25, 41.65], [-100.18, 41.68], [-100.15, 41.75], [-100.25, 42.0], [-100.15, 42.25], [-100.18, 42.32], [-100.53, 42.47], [-100.75, 43.0], [-100.65, 43.25], [-100.75, 43.5], [-100.53, 44.03], [-100.18, 44.18], [-100.03, 44.53], [-99.5, 44.75], [-98.97, 44.53], [-98.82, 44.18], [-98.75, 44.15], [-98.5, 44.25], [-97.97, 44.03], [-97.75, 43.5], [-97.85, 43.25], [-97.82, 43.18], [-97.47, 43.03], [-97.25, 42.5], [-97.47, 41.97], [-97.82, 41.82], [-97.85, 41.75], [-97.75, 41.5], [-97.97, 40.97], [-98.32, 40.82], [-98.47, 40.47], [-99.0, 40.25], [-99.25, 40.35], [-99.5, 40.25], [-99.75, 40.35], [-99.82, 40.32], [-99.97, 39.97], [-100.5, 39.75], [-101.03, 39.97], [-101.25, 40.5], [-101.15, 40.75], [-101.25, 41.0], [-101.03, 41.53]]]]}, "2026-05-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-101.03, 41.53], [-100.5, 41.75], [-100.25, 41.65], [-100.18, 41.68], [-100.15, 41.75], [-100.25, 42.0], [-100.15, 42.25], [-100.18, 42.32], [-100.53, 42.47], [-100.75, 43.0], [-100.65, 43.25], [-100.75, 43.5], [-100.53, 44.03], [-100.18, 44.18], [-100.03, 44.53], [-99.5, 44.75], [-98.97, 44.53], [-98.82, 44.18], [-98.75, 44.15], [-98.5, 44.25], [-97.97, 44.03], [-97.75, 43.5], [-97.85, 43.25], [-97.82, 43.18], [-97.47, 43.03], [-97.25, 42.5], [-97.47, 41.97], [-97.82, 41.82], [-97.85, 41.75], [-97.75, 41.5], [-97.97, 40.97], [-98.32, 40.82], [-98.47, 40.47], [-99.0, 40.25], [-99.25, 40.35], [-99.5, 40.25], [-99.75, 40.35], [-99.82, 40.32], [-99.97, 39.97], [-100.5, 39.75], [-101.03, 39.97], [-101.25, 40.5], [-101.15, 40.75], [-101.25, 41.0], [-101.03, 41.53]]]]}, "2026-05-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-101.03, 41.53], [-100.5, 41.75], [-100.25, 41.65], [-100.18, 41.68], [-100.15, 41.75], [-100.25, 42.0], [-100.15, 42.25], [-100.18, 42.32], [-100.53, 42.47], [-100.75, 43.0], [-100.65, 43.25], [-100.75, 43.5], [-100.53, 44.03], [-100.18, 44.18], [-100.03, 44.53], [-99.5, 44.75], [-98.97, 44.53], [-98.82, 44.18], [-98.75, 44.15], [-98.5, 44.25], [-97.97, 44.03], [-97.75, 43.5], [-97.85, 43.25], [-97.82, 43.18], [-97.47, 43.03], [-97.25, 42.5], [-97.47, 41.97], [-97.82, 41.82], [-97.85, 41.75], [-97.75, 41.5], [-97.97, 40.97], [-98.32, 40.82], [-98.47, 40.47], [-99.0, 40.25], [-99.25, 40.35], [-99.5, 40.25], [-99.75, 40.35], [-99.82, 40.32], [-99.97, 39.97], [-100.5, 39.75], [-101.03, 39.97], [-101.25, 40.5], [-101.15, 40.75], [-101.25, 41.0], [-101.03, 41.53]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -8.06928138282484}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -6.807485097472087}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [8.344589911566857, 8.303876919216634, 9.699605984157984]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [6.72193298339846, 7.275936381022177, 9.112084960937523]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-7.033031586175045, -7.260169607131779, -6.129254099109438]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-8.03975317588231, -8.06928138282484, -6.945394307098979]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5990134529984623, -1.676439703167108, -1.4222245361195647]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.7647225086573233, -1.8215443905274344, -1.5652858373459706]}}