{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:05:10.679849", "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-31_to_2025-Jun-02_280.0_39.0"}, "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": 2025050000785}, "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 31 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "June 02 2025"}, "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": 52347.52513651116}, "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": []}, "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": 39.0}, "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": 280.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "280.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 279.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 281.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 38.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 41.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-81.75, 39.5], [-81.53, 40.03], [-81.18, 40.18], [-81.03, 40.53], [-80.68, 40.68], [-80.53, 41.03], [-80.18, 41.18], [-80.03, 41.53], [-79.5, 41.75], [-79.25, 41.65], [-79.0, 41.75], [-78.75, 41.65], [-78.5, 41.75], [-77.97, 41.53], [-77.75, 41.0], [-77.97, 40.47], [-78.32, 40.32], [-78.35, 40.25], [-78.25, 40.0], [-78.47, 39.47], [-78.82, 39.32], [-78.85, 39.25], [-78.75, 39.0], [-78.85, 38.75], [-78.75, 38.5], [-78.97, 37.97], [-79.5, 37.75], [-79.75, 37.85], [-80.0, 37.75], [-80.25, 37.85], [-80.5, 37.75], [-80.75, 37.85], [-81.0, 37.75], [-81.53, 37.97], [-81.75, 38.5], [-81.65, 38.75], [-81.75, 39.0], [-81.65, 39.25], [-81.75, 39.5]]]]}}, "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": {"2025-05-31T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-81.75, 39.0], [-81.64999999999998, 39.25], [-81.75, 39.5], [-81.52999999999997, 40.03], [-81.18, 40.18], [-81.02999999999997, 40.53], [-80.68, 40.68], [-80.52999999999997, 41.03], [-80.18, 41.18], [-80.02999999999997, 41.53], [-79.5, 41.75], [-79.25, 41.65], [-79.0, 41.75], [-78.75, 41.65], [-78.5, 41.75], [-77.97000000000003, 41.53], [-77.75, 41.0], [-77.97000000000003, 40.47], [-78.32, 40.32], [-78.35000000000002, 40.25], [-78.25, 40.0], [-78.47000000000003, 39.47], [-78.82, 39.32], [-78.85000000000002, 39.25], [-78.75, 39.0], [-78.85000000000002, 38.75], [-78.75, 38.5], [-78.97000000000003, 37.97], [-79.5, 37.75], [-79.75, 37.85], [-80.0, 37.75], [-80.25, 37.85], [-80.5, 37.75], [-80.75, 37.85], [-81.0, 37.75], [-81.52999999999997, 37.97], [-81.75, 38.5], [-81.64999999999998, 38.75], [-81.75, 39.0]]]]}, "2025-06-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-81.75, 39.0], [-81.64999999999998, 39.25], [-81.75, 39.5], [-81.52999999999997, 40.03], [-81.18, 40.18], [-81.02999999999997, 40.53], [-80.68, 40.68], [-80.52999999999997, 41.03], [-80.18, 41.18], [-80.02999999999997, 41.53], [-79.5, 41.75], [-79.25, 41.65], [-79.0, 41.75], [-78.75, 41.65], [-78.5, 41.75], [-77.97000000000003, 41.53], [-77.75, 41.0], [-77.97000000000003, 40.47], [-78.32, 40.32], [-78.35000000000002, 40.25], [-78.25, 40.0], [-78.47000000000003, 39.47], [-78.82, 39.32], [-78.85000000000002, 39.25], [-78.75, 39.0], [-78.85000000000002, 38.75], [-78.75, 38.5], [-78.97000000000003, 37.97], [-79.5, 37.75], [-79.75, 37.85], [-80.0, 37.75], [-80.25, 37.85], [-80.5, 37.75], [-80.75, 37.85], [-81.0, 37.75], [-81.52999999999997, 37.97], [-81.75, 38.5], [-81.64999999999998, 38.75], [-81.75, 39.0]]]]}, "2025-06-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-81.75, 39.0], [-81.64999999999998, 39.25], [-81.75, 39.5], [-81.52999999999997, 40.03], [-81.18, 40.18], [-81.02999999999997, 40.53], [-80.68, 40.68], [-80.52999999999997, 41.03], [-80.18, 41.18], [-80.02999999999997, 41.53], [-79.5, 41.75], [-79.25, 41.65], [-79.0, 41.75], [-78.75, 41.65], [-78.5, 41.75], [-77.97000000000003, 41.53], [-77.75, 41.0], [-77.97000000000003, 40.47], [-78.32, 40.32], [-78.35000000000002, 40.25], [-78.25, 40.0], [-78.47000000000003, 39.47], [-78.82, 39.32], [-78.85000000000002, 39.25], [-78.75, 39.0], [-78.85000000000002, 38.75], [-78.75, 38.5], [-78.97000000000003, 37.97], [-79.5, 37.75], [-79.75, 37.85], [-80.0, 37.75], [-80.25, 37.85], [-80.5, 37.75], [-80.75, 37.85], [-81.0, 37.75], [-81.52999999999997, 37.97], [-81.75, 38.5], [-81.64999999999998, 38.75], [-81.75, 39.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -7.7059911465207165}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.891790012997434}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [12.765597742254158, 10.817477971857272, 12.97023648348727]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [10.694323476155603, 8.693032836914085, 10.808445231119833]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.43428042131219, -7.255677949313124, -4.985411668366988]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.213270338441134, -7.7059911465207165, -5.390208006478133]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4836202156938805, -2.07929439778051, -1.493176464687015]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.6646988906618034, -2.271379755282203, -1.6816063022163863]}}