{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:13:24.831138", "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": "2021-Sep-12_to_2021-Sep-15_297.5_56.0"}, "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": 2021090000452}, "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": "September 12 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 15 2021"}, "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": 74698.45303369145}, "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": 56.0}, "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": 297.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "297.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 294.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 298.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 54.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 57.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-66.53, 56.03], [-66.0, 56.25], [-65.75, 56.15], [-65.68, 56.18], [-65.65, 56.25], [-65.75, 56.5], [-65.65, 56.75], [-65.75, 57.0], [-65.53, 57.53], [-65.18, 57.68], [-65.03, 58.03], [-64.5, 58.25], [-63.97, 58.03], [-63.82, 57.68], [-63.75, 57.65], [-63.5, 57.75], [-63.25, 57.65], [-63.0, 57.75], [-62.47, 57.53], [-62.32, 57.18], [-62.25, 57.15], [-62.0, 57.25], [-61.75, 57.15], [-61.5, 57.25], [-60.97, 57.03], [-60.75, 56.5], [-60.85, 56.25], [-60.75, 56.0], [-60.85, 55.75], [-60.75, 55.5], [-60.85, 55.25], [-60.75, 55.0], [-60.97, 54.47], [-61.32, 54.32], [-61.47, 53.97], [-62.0, 53.75], [-62.25, 53.85], [-62.5, 53.75], [-62.75, 53.85], [-63.0, 53.75], [-63.25, 53.85], [-63.5, 53.75], [-64.03, 53.97], [-64.18, 54.32], [-64.25, 54.35], [-64.5, 54.25], [-64.75, 54.35], [-65.0, 54.25], [-65.53, 54.47], [-65.68, 54.82], [-65.75, 54.85], [-66.0, 54.75], [-66.53, 54.97], [-66.75, 55.5], [-66.53, 56.03]]]]}}, "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": {"2021-09-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-64.25, 57.0], [-64.02999999999997, 57.53], [-63.5, 57.75], [-63.25, 57.65], [-63.0, 57.75], [-62.47000000000003, 57.53], [-62.31999999999999, 57.18], [-62.25, 57.15], [-62.0, 57.25], [-61.75, 57.15], [-61.5, 57.25], [-60.97000000000003, 57.03], [-60.75, 56.5], [-60.85000000000002, 56.25], [-60.75, 56.0], [-60.85000000000002, 55.75], [-60.75, 55.5], [-60.85000000000002, 55.25], [-60.75, 55.0], [-60.97000000000003, 54.47], [-61.5, 54.25], [-62.02999999999997, 54.47], [-62.18000000000001, 54.82], [-62.52999999999997, 54.97], [-62.68000000000001, 55.32], [-62.75, 55.35], [-63.0, 55.25], [-63.52999999999997, 55.47], [-63.68000000000001, 55.82], [-64.02999999999997, 55.97], [-64.25, 56.5], [-64.14999999999998, 56.75], [-64.25, 57.0]]]]}, "2021-09-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-66.0, 54.75], [-66.52999999999997, 54.97], [-66.75, 55.5], [-66.52999999999997, 56.03], [-66.0, 56.25], [-65.75, 56.15], [-65.68, 56.18], [-65.64999999999998, 56.25], [-65.75, 56.5], [-65.64999999999998, 56.75], [-65.75, 57.0], [-65.52999999999997, 57.53], [-65.18, 57.68], [-65.02999999999997, 58.03], [-64.5, 58.25], [-63.97000000000003, 58.03], [-63.81999999999999, 57.68], [-63.75, 57.65], [-63.5, 57.75], [-63.25, 57.65], [-63.0, 57.75], [-62.47000000000003, 57.53], [-62.31999999999999, 57.18], [-62.25, 57.15], [-62.0, 57.25], [-61.75, 57.15], [-61.5, 57.25], [-60.97000000000003, 57.03], [-60.75, 56.5], [-60.85000000000002, 56.25], [-60.75, 56.0], [-60.85000000000002, 55.75], [-60.75, 55.5], [-60.85000000000002, 55.25], [-60.75, 55.0], [-60.97000000000003, 54.47], [-61.31999999999999, 54.32], [-61.47000000000003, 53.97], [-62.0, 53.75], [-62.25, 53.85], [-62.5, 53.75], [-62.75, 53.85], [-63.0, 53.75], [-63.25, 53.85], [-63.5, 53.75], [-64.02999999999997, 53.97], [-64.18, 54.32], [-64.25, 54.35], [-64.5, 54.25], [-64.75, 54.35], [-65.0, 54.25], [-65.52999999999997, 54.47], [-65.68, 54.82], [-65.75, 54.85], [-66.0, 54.75]]]]}, "2021-09-14T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-66.0, 54.75], [-66.52999999999997, 54.97], [-66.75, 55.5], [-66.52999999999997, 56.03], [-66.0, 56.25], [-65.75, 56.15], [-65.68, 56.18], [-65.64999999999998, 56.25], [-65.75, 56.5], [-65.64999999999998, 56.75], [-65.75, 57.0], [-65.52999999999997, 57.53], [-65.18, 57.68], [-65.02999999999997, 58.03], [-64.5, 58.25], [-63.97000000000003, 58.03], [-63.81999999999999, 57.68], [-63.75, 57.65], [-63.5, 57.75], [-63.25, 57.65], [-63.0, 57.75], [-62.47000000000003, 57.53], [-62.31999999999999, 57.18], [-62.25, 57.15], [-62.0, 57.25], [-61.75, 57.15], [-61.5, 57.25], [-60.97000000000003, 57.03], [-60.75, 56.5], [-60.85000000000002, 56.25], [-60.75, 56.0], [-60.85000000000002, 55.75], [-60.75, 55.5], [-60.85000000000002, 55.25], [-60.75, 55.0], [-60.97000000000003, 54.47], [-61.31999999999999, 54.32], 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1.7862105853570824, 1.0853351812146457, 0.7994440900634459]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [0.08805877273573515, -0.5808796577126714, -0.5207635360562222, -1.423443453829634]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.504854305702829, -4.842922369426103, -5.378402891662689, -5.383162358088037]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.130709285388377, -6.083556908172341, -6.559177673146905, -7.690256727186238]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.374305811148553, -1.4440386168642247, -1.5853186046009127, -1.573498905696683]}, "anom_scaled_evo_maxamp": {"name": "Evolution 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