{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:04:59.889686", "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-May-10_to_2025-May-12_267.0_29.5"}, "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": 2025050000253}, "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": "May 10 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 12 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": 201940.751642239}, "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": 29.5}, "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": 267.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "267.0\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": 270.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 27.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 32.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-94.5, 30.25], [-94.25, 30.15], [-94.18, 30.18], [-94.04, 30.5], [-94.25, 31.0], [-94.15, 31.25], [-94.25, 31.5], [-94.03, 32.03], [-93.5, 32.25], [-93.25, 32.15], [-93.18, 32.18], [-93.03, 32.53], [-92.5, 32.75], [-92.25, 32.65], [-92.0, 32.75], [-91.75, 32.65], [-91.5, 32.75], [-90.97, 32.53], [-90.82, 32.18], [-90.75, 32.15], [-90.5, 32.25], [-90.25, 32.15], [-90.0, 32.25], [-89.47, 32.03], [-89.25, 31.5], [-89.35, 31.25], [-89.32, 31.18], [-88.97, 31.03], [-88.75, 30.5], [-88.85, 30.25], [-88.75, 30.0], [-88.97, 29.47], [-89.32, 29.32], [-89.35, 29.25], [-89.32, 29.18], [-88.97, 29.03], [-88.75, 28.5], [-88.85, 28.25], [-88.75, 28.0], [-88.85, 27.75], [-88.75, 27.5], [-88.97, 26.97], [-89.32, 26.82], [-89.47, 26.47], [-90.0, 26.25], [-90.25, 26.35], [-90.5, 26.25], [-90.75, 26.35], [-91.0, 26.25], [-91.25, 26.35], [-91.5, 26.25], [-92.03, 26.47], [-92.18, 26.82], [-92.53, 26.97], [-92.68, 27.32], [-92.75, 27.35], [-93.0, 27.25], [-93.53, 27.47], [-93.68, 27.82], [-94.03, 27.97], [-94.18, 28.32], [-94.25, 28.35], [-94.5, 28.25], [-95.03, 28.47], [-95.25, 29.0], [-95.15, 29.25], [-95.25, 29.5], [-95.03, 30.03], [-94.5, 30.25]], [[-92.68, 30.18], [-92.53, 30.53], [-92.18, 30.68], [-92.15, 30.75], [-92.18, 30.82], [-92.25, 30.85], [-92.5, 30.75], [-92.75, 30.85], [-92.82, 30.82], [-92.96, 30.5], [-92.82, 30.18], [-92.75, 30.15], [-92.68, 30.18]]]]}}, "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": {"2025-05-10T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-95.25, 29.5], [-95.02999999999997, 30.03], [-94.5, 30.25], [-94.25, 30.15], [-94.18, 30.18], [-94.04000000000002, 30.5], [-94.25, 31.0], [-94.14999999999998, 31.25], [-94.25, 31.5], [-94.02999999999997, 32.03], [-93.5, 32.25], [-93.25, 32.15], [-93.18, 32.18], [-93.02999999999997, 32.53], [-92.5, 32.75], [-92.25, 32.65], [-92.0, 32.75], [-91.75, 32.65], [-91.5, 32.75], [-90.97000000000003, 32.53], [-90.82, 32.18], [-90.75, 32.15], [-90.5, 32.25], [-90.25, 32.15], [-90.0, 32.25], [-89.47000000000003, 32.03], [-89.25, 31.5], [-89.35000000000002, 31.25], [-89.32, 31.18], [-88.97000000000003, 31.03], [-88.75, 30.5], [-88.85000000000002, 30.25], [-88.75, 30.0], [-88.97000000000003, 29.47], [-89.32, 29.32], [-89.35000000000002, 29.25], [-89.32, 29.18], [-88.97000000000003, 29.03], [-88.75, 28.5], [-88.85000000000002, 28.25], [-88.75, 28.0], [-88.85000000000002, 27.75], [-88.75, 27.5], [-88.97000000000003, 26.97], [-89.32, 26.82], [-89.47000000000003, 26.47], [-90.0, 26.25], [-90.25, 26.35], [-90.5, 26.25], [-90.75, 26.35], [-91.0, 26.25], [-91.25, 26.35], [-91.5, 26.25], [-92.02999999999997, 26.47], [-92.18, 26.82], [-92.52999999999997, 26.97], [-92.68, 27.32], [-92.75, 27.35], [-93.0, 27.25], [-93.52999999999997, 27.47], [-93.68, 27.82], [-94.02999999999997, 27.97], [-94.18, 28.32], [-94.25, 28.35], [-94.5, 28.25], [-95.02999999999997, 28.47], [-95.25, 29.0], [-95.14999999999998, 29.25], [-95.25, 29.5]], [[-92.82, 30.18], [-92.75, 30.15], [-92.68, 30.18], [-92.52999999999997, 30.53], [-92.18, 30.68], [-92.14999999999998, 30.75], [-92.18, 30.82], [-92.25, 30.85], [-92.5, 30.75], [-92.75, 30.85], [-92.82, 30.82], [-92.95999999999998, 30.5], [-92.82, 30.18]]]]}, "2025-05-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-95.25, 29.5], [-95.02999999999997, 30.03], [-94.5, 30.25], [-94.25, 30.15], [-94.18, 30.18], [-94.04000000000002, 30.5], [-94.25, 31.0], [-94.14999999999998, 31.25], [-94.25, 31.5], [-94.02999999999997, 32.03], [-93.5, 32.25], [-93.25, 32.15], [-93.18, 32.18], [-93.02999999999997, 32.53], [-92.5, 32.75], [-92.25, 32.65], [-92.0, 32.75], [-91.75, 32.65], [-91.5, 32.75], [-90.97000000000003, 32.53], [-90.82, 32.18], [-90.75, 32.15], [-90.5, 32.25], [-90.25, 32.15], [-90.0, 32.25], [-89.47000000000003, 32.03], [-89.25, 31.5], [-89.35000000000002, 31.25], [-89.32, 31.18], [-88.97000000000003, 31.03], 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[-92.75, 30.85], [-92.82, 30.82], [-92.95999999999998, 30.5], [-92.82, 30.18]]]]}, "2025-05-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-95.25, 29.5], [-95.02999999999997, 30.03], [-94.5, 30.25], [-94.25, 30.15], [-94.18, 30.18], [-94.04000000000002, 30.5], [-94.25, 31.0], [-94.14999999999998, 31.25], [-94.25, 31.5], [-94.02999999999997, 32.03], [-93.5, 32.25], [-93.25, 32.15], [-93.18, 32.18], [-93.02999999999997, 32.53], [-92.5, 32.75], [-92.25, 32.65], [-92.0, 32.75], [-91.75, 32.65], [-91.5, 32.75], [-90.97000000000003, 32.53], [-90.82, 32.18], [-90.75, 32.15], [-90.5, 32.25], [-90.25, 32.15], [-90.0, 32.25], [-89.47000000000003, 32.03], [-89.25, 31.5], [-89.35000000000002, 31.25], [-89.32, 31.18], [-88.97000000000003, 31.03], [-88.75, 30.5], [-88.85000000000002, 30.25], [-88.75, 30.0], [-88.97000000000003, 29.47], [-89.32, 29.32], [-89.35000000000002, 29.25], [-89.32, 29.18], [-88.97000000000003, 29.03], [-88.75, 28.5], [-88.85000000000002, 28.25], [-88.75, 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"mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.1858130295337928}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [21.267549947102907, 20.09438930935329, 21.144073147243944]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [17.44432729085287, 15.831328328450525, 18.674172973632835]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.6724201949926614, -3.9413476676630976, -2.9436712259456255]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.023800302605366, -7.29943672027315, -4.874464878034416]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5852720386731252, -2.4034380822120505, -1.7772705364673542]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.9924356533590435, -3.1941311044925524, -3.05649352641808]}}