{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:05:44.229566", "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-Jun-13_to_2025-Jun-15_270.5_46.0"}, "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": 2025060000489}, "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": "June 13 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "June 15 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": 50078.87802938875}, "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": 46.0}, "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": 270.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "270.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 269.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 273.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 44.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 46.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-90.53, 46.53], [-90.0, 46.75], [-89.75, 46.65], [-89.5, 46.75], [-89.25, 46.65], [-89.0, 46.75], [-88.47, 46.53], [-88.32, 46.18], [-88.25, 46.15], [-88.0, 46.25], [-87.75, 46.15], [-87.5, 46.25], [-87.25, 46.15], [-87.0, 46.25], [-86.47, 46.03], [-86.25, 45.5], [-86.47, 44.97], [-86.82, 44.82], [-86.85, 44.75], [-86.75, 44.5], [-86.97, 43.97], [-87.5, 43.75], [-88.0, 43.96], [-88.5, 43.75], [-88.75, 43.85], [-89.0, 43.75], [-89.25, 43.85], [-89.5, 43.75], [-90.03, 43.97], [-90.18, 44.32], [-90.25, 44.35], [-90.5, 44.25], [-90.75, 44.35], [-91.0, 44.25], [-91.53, 44.47], [-91.75, 45.0], [-91.53, 45.53], [-91.18, 45.68], [-91.03, 46.03], [-90.68, 46.18], [-90.53, 46.53]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["C.North-America", "E.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-06-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-91.02999999999997, 46.03], [-90.68, 46.18], [-90.52999999999997, 46.53], [-90.0, 46.75], [-89.75, 46.65], [-89.5, 46.75], [-89.25, 46.65], [-89.0, 46.75], [-88.47000000000003, 46.53], [-88.32, 46.18], [-88.25, 46.15], [-88.0, 46.25], [-87.75, 46.15], [-87.5, 46.25], [-87.25, 46.15], [-87.0, 46.25], [-86.47000000000003, 46.03], [-86.25, 45.5], [-86.47000000000003, 44.97], [-86.82, 44.82], [-86.85000000000002, 44.75], [-86.75, 44.5], [-86.97000000000003, 43.97], [-87.5, 43.75], [-88.0, 43.96], [-88.5, 43.75], [-88.75, 43.85], [-89.0, 43.75], [-89.25, 43.85], [-89.5, 43.75], [-90.02999999999997, 43.97], [-90.18, 44.32], [-90.25, 44.35], [-90.5, 44.25], [-90.75, 44.35], [-91.0, 44.25], [-91.52999999999997, 44.47], [-91.75, 45.0], [-91.52999999999997, 45.53], [-91.18, 45.68], [-91.02999999999997, 46.03]]]]}, "2025-06-14T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-91.02999999999997, 46.03], [-90.68, 46.18], [-90.52999999999997, 46.53], [-90.0, 46.75], [-89.75, 46.65], [-89.5, 46.75], [-89.25, 46.65], [-89.0, 46.75], [-88.47000000000003, 46.53], [-88.32, 46.18], [-88.25, 46.15], [-88.0, 46.25], [-87.75, 46.15], [-87.5, 46.25], [-87.25, 46.15], [-87.0, 46.25], [-86.47000000000003, 46.03], [-86.25, 45.5], [-86.47000000000003, 44.97], [-86.82, 44.82], [-86.85000000000002, 44.75], [-86.75, 44.5], [-86.97000000000003, 43.97], [-87.5, 43.75], [-88.0, 43.96], [-88.5, 43.75], [-88.75, 43.85], [-89.0, 43.75], [-89.25, 43.85], [-89.5, 43.75], [-90.02999999999997, 43.97], [-90.18, 44.32], [-90.25, 44.35], [-90.5, 44.25], [-90.75, 44.35], [-91.0, 44.25], [-91.52999999999997, 44.47], [-91.75, 45.0], [-91.52999999999997, 45.53], [-91.18, 45.68], [-91.02999999999997, 46.03]]]]}, "2025-06-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-91.02999999999997, 46.03], [-90.68, 46.18], [-90.52999999999997, 46.53], [-90.0, 46.75], [-89.75, 46.65], [-89.5, 46.75], [-89.25, 46.65], [-89.0, 46.75], [-88.47000000000003, 46.53], [-88.32, 46.18], [-88.25, 46.15], [-88.0, 46.25], [-87.75, 46.15], [-87.5, 46.25], [-87.25, 46.15], [-87.0, 46.25], [-86.47000000000003, 46.03], [-86.25, 45.5], [-86.47000000000003, 44.97], [-86.82, 44.82], [-86.85000000000002, 44.75], [-86.75, 44.5], [-86.97000000000003, 43.97], [-87.5, 43.75], [-88.0, 43.96], [-88.5, 43.75], [-88.75, 43.85], [-89.0, 43.75], [-89.25, 43.85], [-89.5, 43.75], [-90.02999999999997, 43.97], [-90.18, 44.32], [-90.25, 44.35], [-90.5, 44.25], [-90.75, 44.35], [-91.0, 44.25], [-91.52999999999997, 44.47], [-91.75, 45.0], [-91.52999999999997, 45.53], [-91.18, 45.68], [-91.02999999999997, 46.03]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -8.696825164084487}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -6.135725121219887}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [11.287645179637991, 10.75389688464179, 13.601463240471503]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [9.711345926920615, 8.649086252848349, 12.218109385172568]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-6.570907501339538, -7.24831577633889, -4.587952085981234]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-7.665383817702718, -8.696825164084487, -5.363234472321835]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-2.0181421065646648, -2.241721144724992, -1.4384833203144225]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.2492016373092403, -2.552375902664814, -1.5902714201661103]}}