{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:02:52.694027", "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-Jan-05_to_2025-Jan-08_260.5_37.5"}, "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": 2025010000203}, "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": "January 05 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 08 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": 101577.14980274778}, "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": 37.5}, "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": 260.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 265.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 37.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 40.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-100.53, 38.03], [-100.18, 38.18], [-100.03, 38.53], [-99.68, 38.68], [-99.65, 38.75], [-99.75, 39.0], [-99.53, 39.53], [-99.0, 39.75], [-98.75, 39.65], [-98.68, 39.68], [-98.53, 40.03], [-98.18, 40.18], [-98.03, 40.53], [-97.5, 40.75], [-97.25, 40.65], [-97.0, 40.75], [-96.47, 40.53], [-96.32, 40.18], [-96.25, 40.15], [-96.0, 40.25], [-95.75, 40.15], [-95.5, 40.25], [-94.97, 40.03], [-94.75, 39.5], [-94.85, 39.25], [-94.82, 39.18], [-94.47, 39.03], [-94.25, 38.5], [-94.47, 37.97], [-94.82, 37.82], [-94.97, 37.47], [-95.5, 37.25], [-95.75, 37.35], [-95.82, 37.32], [-95.97, 36.97], [-96.5, 36.75], [-96.75, 36.85], [-97.0, 36.75], [-97.25, 36.85], [-97.5, 36.75], [-97.75, 36.85], [-98.0, 36.75], [-98.25, 36.85], [-98.5, 36.75], [-98.75, 36.85], [-99.0, 36.75], [-99.25, 36.85], [-99.5, 36.75], [-99.75, 36.85], [-100.0, 36.75], [-100.53, 36.97], [-100.75, 37.5], [-100.53, 38.03]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["C.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-01-05T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-100.0, 36.75], [-100.52999999999997, 36.97], [-100.75, 37.5], [-100.52999999999997, 38.03], [-100.0, 38.25], [-99.75, 38.15], [-99.5, 38.25], [-98.97000000000003, 38.03], [-98.75, 37.5], [-98.97000000000003, 36.97], [-99.5, 36.75], [-99.75, 36.85], [-100.0, 36.75]]]]}, "2025-01-06T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-100.02999999999997, 38.53], [-99.68, 38.68], [-99.64999999999998, 38.75], [-99.75, 39.0], [-99.52999999999997, 39.53], [-99.0, 39.75], [-98.75, 39.65], [-98.68, 39.68], [-98.52999999999997, 40.03], [-98.18, 40.18], [-98.02999999999997, 40.53], [-97.5, 40.75], [-97.25, 40.65], [-97.0, 40.75], [-96.47000000000003, 40.53], [-96.32, 40.18], [-96.25, 40.15], [-96.0, 40.25], [-95.75, 40.15], [-95.5, 40.25], [-94.97000000000003, 40.03], [-94.75, 39.5], [-94.85000000000002, 39.25], [-94.82, 39.18], [-94.47000000000003, 39.03], [-94.25, 38.5], [-94.47000000000003, 37.97], [-94.82, 37.82], [-94.97000000000003, 37.47], [-95.5, 37.25], [-95.75, 37.35], [-95.82, 37.32], [-95.97000000000003, 36.97], [-96.5, 36.75], [-96.75, 36.85], [-97.0, 36.75], [-97.25, 36.85], [-97.5, 36.75], [-97.75, 36.85], [-98.0, 36.75], [-98.25, 36.85], [-98.5, 36.75], [-98.75, 36.85], [-99.0, 36.75], [-99.25, 36.85], [-99.5, 36.75], [-99.75, 36.85], [-100.0, 36.75], [-100.52999999999997, 36.97], [-100.75, 37.5], [-100.52999999999997, 38.03], [-100.18, 38.18], [-100.02999999999997, 38.53]]]]}, "2025-01-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-100.02999999999997, 38.53], [-99.68, 38.68], [-99.64999999999998, 38.75], [-99.75, 39.0], [-99.52999999999997, 39.53], [-99.0, 39.75], [-98.75, 39.65], [-98.68, 39.68], [-98.52999999999997, 40.03], [-98.18, 40.18], [-98.02999999999997, 40.53], [-97.5, 40.75], [-97.25, 40.65], [-97.0, 40.75], [-96.47000000000003, 40.53], [-96.32, 40.18], [-96.25, 40.15], [-96.0, 40.25], [-95.75, 40.15], [-95.5, 40.25], [-94.97000000000003, 40.03], [-94.75, 39.5], [-94.85000000000002, 39.25], [-94.82, 39.18], [-94.47000000000003, 39.03], [-94.25, 38.5], [-94.47000000000003, 37.97], [-94.82, 37.82], [-94.97000000000003, 37.47], [-95.5, 37.25], [-95.75, 37.35], [-95.82, 37.32], [-95.97000000000003, 36.97], [-96.5, 36.75], [-96.75, 36.85], [-97.0, 36.75], [-97.25, 36.85], [-97.5, 36.75], [-97.75, 36.85], [-98.0, 36.75], [-98.25, 36.85], [-98.5, 36.75], [-98.75, 36.85], [-99.0, 36.75], [-99.25, 36.85], [-99.5, 36.75], [-99.75, 36.85], [-100.0, 36.75], [-100.52999999999997, 36.97], [-100.75, 37.5], [-100.52999999999997, 38.03], [-100.18, 38.18], [-100.02999999999997, 38.53]]]]}, "2025-01-08T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-100.25, 38.0], [-100.02999999999997, 38.53], [-99.68, 38.68], [-99.64999999999998, 38.75], [-99.75, 39.0], [-99.52999999999997, 39.53], [-99.0, 39.75], [-98.75, 39.65], [-98.68, 39.68], [-98.52999999999997, 40.03], [-98.18, 40.18], [-98.02999999999997, 40.53], [-97.5, 40.75], [-97.25, 40.65], [-97.0, 40.75], [-96.47000000000003, 40.53], [-96.32, 40.18], [-96.25, 40.15], [-96.0, 40.25], [-95.75, 40.15], [-95.5, 40.25], [-94.97000000000003, 40.03], [-94.75, 39.5], [-94.85000000000002, 39.25], [-94.82, 39.18], [-94.47000000000003, 39.03], [-94.25, 38.5], [-94.47000000000003, 37.97], [-94.82, 37.82], [-94.97000000000003, 37.47], [-95.5, 37.25], [-95.75, 37.35], [-95.82, 37.32], [-95.97000000000003, 36.97], [-96.5, 36.75], [-96.75, 36.85], [-97.0, 36.75], [-97.25, 36.85], [-97.5, 36.75], [-97.75, 36.85], [-98.0, 36.75], [-98.25, 36.85], [-98.5, 36.75], [-98.75, 36.85], [-99.0, 36.75], [-99.25, 36.85], [-99.5, 36.75], [-100.02999999999997, 36.97], [-100.25, 37.5], [-100.14999999999998, 37.75], [-100.25, 38.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -14.488136963123395}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -12.07055386492021}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-8.447846476236919, -13.782407612270731, -13.822544963776068, -12.148003657271204]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-8.501353963216104, -16.03405609130857, -15.458382670084632, -14.337154769897438]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-7.812389535407078, -12.492084061748571, -12.639391572110545, -11.263745979316333]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-7.853731659500909, -14.488136963123395, -14.465058878542209, -13.316580534297657]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.403313864212942, -2.095777698391328, -2.115891613126171, -1.9077504968293373]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.4197770103313345, -2.610097288328643, -2.6012465679428844, -2.377267819625045]}}