{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:09:20.184540", "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-Dec-16_to_2025-Dec-20_266.0_61.5"}, "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": 2025120000585}, "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": "December 16 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 20 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 5}, "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": 68543.4067297438}, "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": ["Canada"]}, "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": 61.5}, "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": 266.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "266.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 262.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 266.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 59.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 64.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-93.47, 60.97], [-93.82, 60.82], [-93.97, 60.47], [-94.32, 60.32], [-94.35, 60.25], [-94.25, 60.0], [-94.35, 59.75], [-94.25, 59.5], [-94.47, 58.97], [-95.0, 58.75], [-95.25, 58.85], [-95.5, 58.75], [-95.75, 58.85], [-96.0, 58.75], [-96.25, 58.85], [-96.5, 58.75], [-97.03, 58.97], [-97.25, 59.5], [-97.15, 59.75], [-97.25, 60.0], [-97.04, 60.5], [-97.25, 61.0], [-97.15, 61.25], [-97.25, 61.5], [-97.12, 61.8], [-97.25, 61.85], [-97.5, 61.75], [-98.03, 61.97], [-98.25, 62.5], [-98.04, 63.0], [-98.18, 63.32], [-98.53, 63.47], [-98.75, 64.0], [-98.53, 64.53], [-98.0, 64.75], [-97.75, 64.65], [-97.5, 64.75], [-97.25, 64.65], [-97.0, 64.75], [-96.47, 64.53], [-96.32, 64.18], [-96.25, 64.15], [-96.0, 64.25], [-95.75, 64.15], [-95.5, 64.25], [-94.97, 64.03], [-94.82, 63.68], [-94.75, 63.65], [-94.5, 63.75], [-94.25, 63.65], [-94.0, 63.75], [-93.47, 63.53], [-93.25, 63.0], [-93.35, 62.75], [-93.25, 62.5], [-93.35, 62.25], [-93.25, 62.0], [-93.35, 61.75], [-93.25, 61.5], [-93.47, 60.97]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.E.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-12-16T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-98.52999999999997, 63.47], [-98.75, 64.0], [-98.52999999999997, 64.53], [-98.0, 64.75], [-97.75, 64.65], [-97.5, 64.75], [-97.25, 64.65], [-97.0, 64.75], [-96.47000000000003, 64.53], [-96.32, 64.18], [-96.25, 64.15], [-96.0, 64.25], [-95.75, 64.15], [-95.5, 64.25], [-94.97000000000003, 64.03], [-94.82, 63.68], [-94.75, 63.65], [-94.5, 63.75], [-94.25, 63.65], [-94.0, 63.75], [-93.47000000000003, 63.53], [-93.25, 63.0], [-93.35000000000002, 62.75], [-93.25, 62.5], [-93.35000000000002, 62.25], [-93.25, 62.0], [-93.35000000000002, 61.75], [-93.25, 61.5], [-93.47000000000003, 60.97], [-94.0, 60.75], [-94.25, 60.85], [-94.5, 60.75], [-94.75, 60.85], [-95.0, 60.75], [-95.25, 60.85], [-95.5, 60.75], [-95.75, 60.85], [-96.0, 60.75], [-96.25, 60.85], [-96.5, 60.75], [-97.02999999999997, 60.97], [-97.25, 61.5], [-97.12, 61.8], [-97.25, 61.85], [-97.5, 61.75], [-98.02999999999997, 61.97], [-98.25, 62.5], [-98.04000000000002, 63.0], [-98.18, 63.32], [-98.52999999999997, 63.47]]]]}, "2025-12-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-98.52999999999997, 63.47], [-98.75, 64.0], [-98.52999999999997, 64.53], [-98.0, 64.75], [-97.75, 64.65], [-97.5, 64.75], [-97.25, 64.65], [-97.0, 64.75], [-96.47000000000003, 64.53], [-96.32, 64.18], [-96.25, 64.15], [-96.0, 64.25], [-95.75, 64.15], [-95.5, 64.25], [-94.97000000000003, 64.03], [-94.82, 63.68], [-94.75, 63.65], [-94.5, 63.75], [-94.25, 63.65], [-94.0, 63.75], [-93.47000000000003, 63.53], [-93.25, 63.0], [-93.35000000000002, 62.75], [-93.25, 62.5], [-93.35000000000002, 62.25], [-93.25, 62.0], [-93.35000000000002, 61.75], [-93.25, 61.5], [-93.47000000000003, 60.97], [-93.82, 60.82], [-93.97000000000003, 60.47], [-94.32, 60.32], [-94.35000000000002, 60.25], [-94.25, 60.0], [-94.35000000000002, 59.75], [-94.25, 59.5], [-94.47000000000003, 58.97], [-95.0, 58.75], [-95.25, 58.85], [-95.5, 58.75], [-95.75, 58.85], [-96.0, 58.75], [-96.25, 58.85], [-96.5, 58.75], [-97.02999999999997, 58.97], [-97.25, 59.5], [-97.14999999999998, 59.75], [-97.25, 60.0], [-97.04000000000002, 60.5], [-97.25, 61.0], [-97.14999999999998, 61.25], [-97.25, 61.5], [-97.12, 61.8], [-97.25, 61.85], [-97.5, 61.75], [-98.02999999999997, 61.97], [-98.25, 62.5], [-98.04000000000002, 63.0], [-98.18, 63.32], [-98.52999999999997, 63.47]]]]}, "2025-12-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-98.52999999999997, 63.47], [-98.75, 64.0], [-98.52999999999997, 64.53], [-98.0, 64.75], [-97.75, 64.65], [-97.5, 64.75], [-97.25, 64.65], [-97.0, 64.75], [-96.47000000000003, 64.53], [-96.32, 64.18], [-96.25, 64.15], [-96.0, 64.25], [-95.75, 64.15], [-95.5, 64.25], [-94.97000000000003, 64.03], [-94.82, 63.68], [-94.75, 63.65], [-94.5, 63.75], [-94.25, 63.65], [-94.0, 63.75], [-93.47000000000003, 63.53], [-93.25, 63.0], [-93.35000000000002, 62.75], [-93.25, 62.5], [-93.35000000000002, 62.25], [-93.25, 62.0], [-93.35000000000002, 61.75], [-93.25, 61.5], [-93.47000000000003, 60.97], [-93.82, 60.82], [-93.97000000000003, 60.47], [-94.32, 60.32], [-94.35000000000002, 60.25], [-94.25, 60.0], [-94.35000000000002, 59.75], [-94.25, 59.5], [-94.47000000000003, 58.97], [-95.0, 58.75], [-95.25, 58.85], [-95.5, 58.75], [-95.75, 58.85], [-96.0, 58.75], [-96.25, 58.85], [-96.5, 58.75], [-97.02999999999997, 58.97], [-97.25, 59.5], [-97.14999999999998, 59.75], [-97.25, 60.0], [-97.04000000000002, 60.5], [-97.25, 61.0], [-97.14999999999998, 61.25], [-97.25, 61.5], [-97.12, 61.8], [-97.25, 61.85], [-97.5, 61.75], [-98.02999999999997, 61.97], [-98.25, 62.5], [-98.04000000000002, 63.0], [-98.18, 63.32], [-98.52999999999997, 63.47]]]]}, "2025-12-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-98.25, 64.0], [-98.02999999999997, 64.53], [-97.5, 64.75], [-97.25, 64.65], [-97.0, 64.75], [-96.47000000000003, 64.53], [-96.32, 64.18], [-96.25, 64.15], [-96.0, 64.25], [-95.75, 64.15], [-95.5, 64.25], [-94.97000000000003, 64.03], [-94.82, 63.68], [-94.75, 63.65], [-94.5, 63.75], [-94.25, 63.65], [-94.0, 63.75], [-93.47000000000003, 63.53], [-93.25, 63.0], [-93.35000000000002, 62.75], [-93.25, 62.5], [-93.35000000000002, 62.25], [-93.25, 62.0], [-93.35000000000002, 61.75], [-93.25, 61.5], [-93.47000000000003, 60.97], [-93.82, 60.82], [-93.97000000000003, 60.47], [-94.32, 60.32], [-94.35000000000002, 60.25], [-94.25, 60.0], [-94.35000000000002, 59.75], [-94.25, 59.5], [-94.47000000000003, 58.97], [-95.0, 58.75], [-95.25, 58.85], [-95.5, 58.75], [-95.75, 58.85], [-96.0, 58.75], [-96.25, 58.85], [-96.5, 58.75], [-97.02999999999997, 58.97], [-97.25, 59.5], [-97.14999999999998, 59.75], [-97.25, 60.0], [-97.04000000000002, 60.5], [-97.25, 61.0], [-97.14999999999998, 61.25], [-97.25, 61.5], [-97.12, 61.8], [-97.25, 61.85], [-97.5, 61.75], [-98.02999999999997, 61.97], [-98.25, 62.5], [-98.04000000000002, 63.0], [-98.25, 63.5], [-98.14999999999998, 63.75], [-98.25, 64.0]]]]}, "2025-12-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-97.25, 60.0], [-97.02999999999997, 60.53], [-96.68, 60.68], [-96.52999999999997, 61.03], [-96.0, 61.25], [-95.75, 61.15], [-95.68, 61.18], [-95.52999999999997, 61.53], [-95.0, 61.75], [-94.75, 61.65], [-94.68, 61.68], [-94.52999999999997, 62.03], [-94.0, 62.25], [-93.47000000000003, 62.03], [-93.25, 61.5], [-93.47000000000003, 60.97], [-93.82, 60.82], [-93.97000000000003, 60.47], [-94.32, 60.32], [-94.35000000000002, 60.25], [-94.25, 60.0], [-94.35000000000002, 59.75], [-94.25, 59.5], [-94.47000000000003, 58.97], [-95.0, 58.75], [-95.25, 58.85], [-95.5, 58.75], [-95.75, 58.85], [-96.0, 58.75], [-96.25, 58.85], [-96.5, 58.75], [-97.02999999999997, 58.97], [-97.25, 59.5], [-97.14999999999998, 59.75], [-97.25, 60.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -15.396504018043089}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -11.023656706507948}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-37.253572394258214, -36.653496968154315, -35.299702004507054, -37.50335797848902, -35.141184325445295]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-38.682826741536445, -37.827113850911445, -36.26071395874021, -41.799932225545234, -36.15542004903156]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-11.598377035991259, -11.388490570101974, -9.772009733904751, -11.740394325421947, -10.373224952179632]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-12.675049157745804, -12.574127135002499, -10.639042674099016, -15.396504018043089, -11.233481000224174]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.496782168517634, -1.4372432273899454, -1.1996983148852565, -1.4174968180131922, -1.2547667514438317]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.6496103753902611, -1.5419883392497775, -1.293812931070098, -1.7678930168114286, -1.362277392722329]}}