{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:06:58.110991", "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-Aug-18_to_2025-Aug-21_290.5_44.0"}, "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": 2025080000667}, "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": "August 18 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 21 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": 59224.970457826166}, "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"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["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": ["Atlantic Ocean"]}, "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": 44.0}, "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": 290.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "290.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 286.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 290.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 41.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 44.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-74.53, 43.03], [-74.18, 43.18], [-74.15, 43.25], [-74.18, 43.32], [-74.53, 43.47], [-74.75, 44.0], [-74.53, 44.53], [-74.0, 44.75], [-73.75, 44.65], [-73.5, 44.75], [-72.97, 44.53], [-72.82, 44.18], [-72.75, 44.15], [-72.5, 44.25], [-72.25, 44.15], [-72.0, 44.25], [-71.47, 44.03], [-71.32, 43.68], [-71.25, 43.65], [-71.18, 43.68], [-71.03, 44.03], [-70.68, 44.18], [-70.53, 44.53], [-70.0, 44.75], [-69.75, 44.65], [-69.5, 44.75], [-68.97, 44.53], [-68.75, 44.0], [-68.97, 43.47], [-69.5, 43.25], [-69.75, 43.35], [-69.82, 43.32], [-69.97, 42.97], [-70.32, 42.82], [-70.35, 42.75], [-70.25, 42.5], [-70.35, 42.25], [-70.25, 42.0], [-70.37, 41.7], [-70.25, 41.65], [-70.0, 41.75], [-69.75, 41.65], [-69.5, 41.75], [-68.97, 41.53], [-68.75, 41.0], [-68.97, 40.47], [-69.5, 40.25], [-69.75, 40.35], [-70.0, 40.25], [-70.25, 40.35], [-70.5, 40.25], [-70.75, 40.35], [-71.0, 40.25], [-71.53, 40.47], [-71.68, 40.82], [-71.75, 40.85], [-72.0, 40.75], [-72.25, 40.85], [-72.32, 40.82], [-72.47, 40.47], [-73.0, 40.25], [-73.53, 40.47], [-73.75, 41.0], [-73.53, 41.53], [-73.18, 41.68], [-73.03, 42.03], [-72.68, 42.18], [-72.53, 42.53], [-72.18, 42.68], [-72.15, 42.75], [-72.18, 42.82], [-72.25, 42.85], [-72.5, 42.75], [-72.75, 42.85], [-72.82, 42.82], [-72.97, 42.47], [-73.32, 42.32], [-73.47, 41.97], [-74.0, 41.75], [-74.53, 41.97], [-74.75, 42.5], [-74.53, 43.03]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-08-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-74.75, 44.0], [-74.52999999999997, 44.53], [-74.0, 44.75], [-73.75, 44.65], [-73.5, 44.75], [-72.97000000000003, 44.53], [-72.82, 44.18], [-72.75, 44.15], [-72.5, 44.25], [-72.25, 44.15], [-72.0, 44.25], [-71.47000000000003, 44.03], [-71.25, 43.5], [-71.47000000000003, 42.97], [-72.0, 42.75], [-72.25, 42.85], [-72.5, 42.75], [-72.75, 42.85], [-72.82, 42.82], [-72.97000000000003, 42.47], [-73.5, 42.25], [-74.02999999999997, 42.47], [-74.25, 43.0], [-74.14999999999998, 43.25], [-74.18, 43.32], [-74.52999999999997, 43.47], [-74.75, 44.0]]], [[[-70.52999999999997, 43.47], [-70.75, 44.0], [-70.52999999999997, 44.53], [-70.0, 44.75], [-69.75, 44.65], [-69.5, 44.75], [-68.97000000000003, 44.53], [-68.75, 44.0], [-68.97000000000003, 43.47], [-69.5, 43.25], [-69.75, 43.35], [-70.0, 43.25], [-70.52999999999997, 43.47]]]]}, "2025-08-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-74.14999999999998, 43.25], [-74.18, 43.32], [-74.52999999999997, 43.47], [-74.75, 44.0], [-74.52999999999997, 44.53], [-74.0, 44.75], [-73.75, 44.65], [-73.5, 44.75], [-72.97000000000003, 44.53], [-72.82, 44.18], [-72.75, 44.15], [-72.5, 44.25], [-72.25, 44.15], [-72.0, 44.25], [-71.47000000000003, 44.03], [-71.32, 43.68], [-71.25, 43.65], [-71.18, 43.68], [-71.02999999999997, 44.03], [-70.68, 44.18], [-70.52999999999997, 44.53], [-70.0, 44.75], [-69.75, 44.65], [-69.5, 44.75], [-68.97000000000003, 44.53], [-68.75, 44.0], [-68.97000000000003, 43.47], [-69.5, 43.25], [-69.75, 43.35], [-69.82, 43.32], [-69.97000000000003, 42.97], [-70.32, 42.82], [-70.35000000000002, 42.75], [-70.25, 42.5], [-70.35000000000002, 42.25], [-70.25, 42.0], [-70.37, 41.7], [-70.25, 41.65], [-70.0, 41.75], [-69.75, 41.65], [-69.5, 41.75], [-68.97000000000003, 41.53], [-68.75, 41.0], [-68.97000000000003, 40.47], [-69.5, 40.25], [-69.75, 40.35], [-70.0, 40.25], [-70.25, 40.35], [-70.5, 40.25], [-70.75, 40.35], [-71.0, 40.25], [-71.52999999999997, 40.47], [-71.68, 40.82], [-71.75, 40.85], [-72.0, 40.75], [-72.25, 40.85], [-72.32, 40.82], [-72.47000000000003, 40.47], [-73.0, 40.25], [-73.52999999999997, 40.47], [-73.75, 41.0], [-73.52999999999997, 41.53], [-73.18, 41.68], [-73.02999999999997, 42.03], [-72.68, 42.18], [-72.52999999999997, 42.53], [-72.18, 42.68], [-72.14999999999998, 42.75], [-72.18, 42.82], [-72.25, 42.85], [-72.5, 42.75], [-72.75, 42.85], [-72.82, 42.82], [-72.97000000000003, 42.47], [-73.32, 42.32], [-73.47000000000003, 41.97], [-74.0, 41.75], [-74.52999999999997, 41.97], [-74.75, 42.5], [-74.52999999999997, 43.03], [-74.18, 43.18], [-74.14999999999998, 43.25]]]]}, "2025-08-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-74.14999999999998, 43.25], [-74.18, 43.32], [-74.52999999999997, 43.47], [-74.75, 44.0], [-74.52999999999997, 44.53], [-74.0, 44.75], [-73.75, 44.65], [-73.5, 44.75], [-72.97000000000003, 44.53], [-72.82, 44.18], [-72.75, 44.15], [-72.5, 44.25], [-72.25, 44.15], [-72.0, 44.25], [-71.47000000000003, 44.03], [-71.32, 43.68], [-71.25, 43.65], [-71.18, 43.68], [-71.02999999999997, 44.03], [-70.68, 44.18], [-70.52999999999997, 44.53], [-70.0, 44.75], [-69.75, 44.65], [-69.5, 44.75], [-68.97000000000003, 44.53], [-68.75, 44.0], [-68.97000000000003, 43.47], [-69.5, 43.25], [-69.75, 43.35], [-69.82, 43.32], [-69.97000000000003, 42.97], [-70.32, 42.82], [-70.35000000000002, 42.75], [-70.25, 42.5], [-70.35000000000002, 42.25], [-70.25, 42.0], [-70.37, 41.7], [-70.25, 41.65], [-70.0, 41.75], [-69.75, 41.65], [-69.5, 41.75], [-68.97000000000003, 41.53], [-68.75, 41.0], [-68.97000000000003, 40.47], [-69.5, 40.25], [-69.75, 40.35], [-70.0, 40.25], [-70.25, 40.35], [-70.5, 40.25], [-70.75, 40.35], [-71.0, 40.25], [-71.52999999999997, 40.47], [-71.68, 40.82], [-71.75, 40.85], [-72.0, 40.75], [-72.25, 40.85], [-72.32, 40.82], [-72.47000000000003, 40.47], [-73.0, 40.25], [-73.52999999999997, 40.47], [-73.75, 41.0], [-73.52999999999997, 41.53], [-73.18, 41.68], [-73.02999999999997, 42.03], [-72.68, 42.18], [-72.52999999999997, 42.53], [-72.18, 42.68], [-72.14999999999998, 42.75], [-72.18, 42.82], [-72.25, 42.85], [-72.5, 42.75], [-72.75, 42.85], [-72.82, 42.82], [-72.97000000000003, 42.47], [-73.32, 42.32], [-73.47000000000003, 41.97], [-74.0, 41.75], [-74.52999999999997, 41.97], [-74.75, 42.5], [-74.52999999999997, 43.03], [-74.18, 43.18], [-74.14999999999998, 43.25]]]]}, "2025-08-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-74.0, 41.75], [-74.52999999999997, 41.97], [-74.75, 42.5], [-74.52999999999997, 43.03], [-74.0, 43.25], [-73.47000000000003, 43.03], [-73.25, 42.5], [-73.47000000000003, 41.97], [-74.0, 41.75]]], [[[-72.68, 42.18], [-72.52999999999997, 42.53], [-72.18, 42.68], [-72.14999999999998, 42.75], [-72.25, 43.0], [-72.02999999999997, 43.53], [-71.5, 43.75], [-71.25, 43.65], [-71.18, 43.68], [-71.02999999999997, 44.03], [-70.68, 44.18], [-70.52999999999997, 44.53], [-70.0, 44.75], [-69.75, 44.65], [-69.5, 44.75], [-68.97000000000003, 44.53], [-68.75, 44.0], [-68.97000000000003, 43.47], [-69.5, 43.25], [-69.75, 43.35], [-69.82, 43.32], [-69.97000000000003, 42.97], [-70.32, 42.82], [-70.35000000000002, 42.75], [-70.25, 42.5], [-70.35000000000002, 42.25], [-70.25, 42.0], [-70.37, 41.7], [-70.25, 41.65], [-70.0, 41.75], [-69.75, 41.65], [-69.5, 41.75], [-68.97000000000003, 41.53], [-68.75, 41.0], [-68.97000000000003, 40.47], [-69.5, 40.25], [-69.75, 40.35], [-70.0, 40.25], [-70.25, 40.35], [-70.5, 40.25], [-70.75, 40.35], [-71.0, 40.25], [-71.52999999999997, 40.47], [-71.68, 40.82], [-71.75, 40.85], [-72.0, 40.75], [-72.25, 40.85], [-72.32, 40.82], [-72.47000000000003, 40.47], [-73.0, 40.25], [-73.52999999999997, 40.47], [-73.75, 41.0], [-73.52999999999997, 41.53], [-73.18, 41.68], [-73.02999999999997, 42.03], [-72.68, 42.18]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -6.074358613045888}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.130987631017675}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [15.361869925039855, 16.70929244603866, 16.298097229003986, 16.650925338477464]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [12.536927795410179, 12.89045104980471, 13.077394104003929, 14.801847076416038]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.263680540999088, -3.9739106996287865, -4.2015182618842, -4.18656487437287]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.2040297333280705, -5.163446866395759, -6.074358613045888, -5.975958138674571]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.6084277102528939, -1.621425653887814, -1.7521988334491776, -1.8625510481685665]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.961498650058232, -1.848717599902006, -2.206693597448636, -2.2455232676120995]}}