{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:19:24.984197", "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": "2022-Apr-16_to_2022-Apr-19_268.0_61.0"}, "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": 2022040000558}, "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": "April 16 2022"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 19 2022"}, "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": 58936.95312280334}, "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": 61.0}, "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": 268.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "268.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 265.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 271.0}, "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": 61.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-94.5, 58.75], [-95.03, 58.97], [-95.25, 59.5], [-95.15, 59.75], [-95.25, 60.0], [-95.15, 60.25], [-95.25, 60.5], [-95.03, 61.03], [-94.68, 61.18], [-94.53, 61.53], [-94.18, 61.68], [-94.03, 62.03], [-93.5, 62.25], [-93.25, 62.15], [-93.0, 62.25], [-92.75, 62.15], [-92.5, 62.25], [-92.25, 62.15], [-92.0, 62.25], [-91.75, 62.15], [-91.5, 62.25], [-91.25, 62.15], [-91.0, 62.25], [-90.75, 62.15], [-90.5, 62.25], [-90.25, 62.15], [-90.0, 62.25], [-89.47, 62.03], [-89.32, 61.68], [-89.25, 61.65], [-89.0, 61.75], [-88.47, 61.53], [-88.25, 61.0], [-88.35, 60.75], [-88.25, 60.5], [-88.47, 59.97], [-89.0, 59.75], [-89.25, 59.85], [-89.5, 59.75], [-89.75, 59.85], [-90.0, 59.75], [-90.25, 59.85], [-90.5, 59.75], [-90.75, 59.85], [-90.82, 59.82], [-90.97, 59.47], [-91.5, 59.25], [-91.75, 59.35], [-92.0, 59.25], [-92.25, 59.35], [-92.5, 59.25], [-92.75, 59.35], [-93.0, 59.25], [-93.25, 59.35], [-93.5, 59.25], [-93.75, 59.35], [-93.82, 59.32], [-93.97, 58.97], [-94.5, 58.75]]]]}}, "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": {"2022-04-16T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-95.02999999999997, 60.03], [-94.5, 60.25], [-93.97000000000003, 60.03], [-93.75, 59.5], [-93.97000000000003, 58.97], [-94.5, 58.75], [-95.02999999999997, 58.97], [-95.25, 59.5], [-95.02999999999997, 60.03]]]]}, "2022-04-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-95.25, 60.0], [-95.14999999999998, 60.25], [-95.25, 60.5], [-95.02999999999997, 61.03], [-94.68, 61.18], [-94.52999999999997, 61.53], [-94.18, 61.68], [-94.02999999999997, 62.03], [-93.5, 62.25], [-93.25, 62.15], [-93.0, 62.25], [-92.75, 62.15], [-92.5, 62.25], [-92.25, 62.15], [-92.0, 62.25], [-91.75, 62.15], [-91.5, 62.25], [-91.25, 62.15], [-91.0, 62.25], [-90.75, 62.15], [-90.5, 62.25], [-90.25, 62.15], [-90.0, 62.25], [-89.47000000000003, 62.03], [-89.32, 61.68], [-89.25, 61.65], [-89.0, 61.75], [-88.47000000000003, 61.53], [-88.25, 61.0], [-88.35000000000002, 60.75], [-88.25, 60.5], [-88.47000000000003, 59.97], [-89.0, 59.75], [-89.25, 59.85], [-89.5, 59.75], [-89.75, 59.85], [-90.0, 59.75], [-90.25, 59.85], [-90.5, 59.75], [-90.75, 59.85], [-90.82, 59.82], [-90.97000000000003, 59.47], [-91.5, 59.25], [-91.75, 59.35], [-92.0, 59.25], [-92.25, 59.35], [-92.5, 59.25], [-92.75, 59.35], [-93.0, 59.25], [-93.25, 59.35], [-93.5, 59.25], [-93.75, 59.35], [-93.82, 59.32], [-93.97000000000003, 58.97], [-94.5, 58.75], [-95.02999999999997, 58.97], [-95.25, 59.5], [-95.14999999999998, 59.75], [-95.25, 60.0]]]]}, "2022-04-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-95.25, 60.0], [-95.14999999999998, 60.25], [-95.25, 60.5], [-95.02999999999997, 61.03], [-94.68, 61.18], [-94.52999999999997, 61.53], [-94.18, 61.68], [-94.02999999999997, 62.03], [-93.5, 62.25], [-93.25, 62.15], [-93.0, 62.25], [-92.75, 62.15], [-92.5, 62.25], [-92.25, 62.15], [-92.0, 62.25], [-91.75, 62.15], [-91.5, 62.25], [-91.25, 62.15], [-91.0, 62.25], [-90.75, 62.15], [-90.5, 62.25], [-90.25, 62.15], [-90.0, 62.25], [-89.47000000000003, 62.03], [-89.32, 61.68], [-89.25, 61.65], [-89.0, 61.75], [-88.47000000000003, 61.53], [-88.25, 61.0], [-88.35000000000002, 60.75], [-88.25, 60.5], [-88.47000000000003, 59.97], [-89.0, 59.75], [-89.25, 59.85], [-89.5, 59.75], [-89.75, 59.85], [-90.0, 59.75], [-90.25, 59.85], [-90.5, 59.75], [-90.75, 59.85], [-90.82, 59.82], [-90.97000000000003, 59.47], [-91.5, 59.25], [-91.75, 59.35], [-92.0, 59.25], [-92.25, 59.35], [-92.5, 59.25], [-92.75, 59.35], [-93.0, 59.25], [-93.25, 59.35], [-93.5, 59.25], [-93.75, 59.35], [-93.82, 59.32], [-93.97000000000003, 58.97], [-94.5, 58.75], [-95.02999999999997, 58.97], [-95.25, 59.5], [-95.14999999999998, 59.75], [-95.25, 60.0]]]]}, "2022-04-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-95.25, 60.5], [-95.02999999999997, 61.03], [-94.68, 61.18], [-94.52999999999997, 61.53], 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"Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -9.758373512238165}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -7.495798470359255}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-17.26114911214404, -18.59195938116227, -18.069282581500943, -15.954144226767085]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-17.26114911214404, -20.76500761421255, -19.488725521826183, -17.18883568193357]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-7.453645433400254, -8.113705356846392, -8.085449632109253, -6.257571869193753]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-7.453645433400254, -9.758373512238165, -9.34560667884736, -7.171818771236303]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3471787630414052, -1.7893568718536823, -1.803907004989669, -1.4577791211894335]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.3471787630414052, -1.9324838636846557, -1.9495424870413691, -1.5712132001839587]}}