{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 09:06:48.075368", "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": "2016-Dec-29_to_2017-Jan-01_290.0_-77.0"}, "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": 2016120000793}, "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 29 2016"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 01 2017"}, "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": 56788.16236694885}, "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": ["Antarctica"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.Antarctica"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Antarctica"]}, "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": ["Southern Ocean"]}, "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": -77.0}, "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": 290.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "290.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 285.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 297.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -79.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -76.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2016-12-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-74.25, -77.0], [-74.03, -76.47], [-73.5, -76.25], [-73.25, -76.35], [-73.0, -76.25], [-72.75, -76.35], [-72.5, -76.25], [-72.25, -76.35], [-72.0, -76.25], [-71.75, -76.35], [-71.5, -76.25], [-71.0, -76.46], [-70.5, -76.25], [-70.25, -76.35], [-70.0, -76.25], [-69.75, -76.35], [-69.5, -76.25], [-69.25, -76.35], [-69.0, -76.25], [-68.75, -76.35], [-68.5, -76.25], [-68.25, -76.35], [-68.0, -76.25], [-67.75, -76.35], [-67.5, -76.25], [-67.25, -76.35], [-67.0, -76.25], [-66.75, -76.35], [-66.5, -76.25], [-66.0, -76.46], [-65.5, -76.25], [-65.25, -76.35], [-65.0, -76.25], [-64.47, -76.47], [-64.32, -76.82], [-64.25, -76.85], [-64.0, -76.75], [-63.75, -76.85], [-63.5, -76.75], [-63.25, -76.85], [-63.0, -76.75], [-62.47, -76.97], [-62.25, -77.5], [-62.47, -78.03], [-63.0, -78.25], [-63.25, -78.15], [-63.5, -78.25], [-63.75, -78.15], [-64.0, -78.25], [-64.25, -78.15], [-64.32, -78.18], [-64.47, -78.53], [-65.0, -78.75], [-65.25, -78.65], [-65.5, -78.75], [-66.03, -78.53], [-66.18, -78.18], [-66.25, -78.15], [-66.32, -78.18], [-66.35, -78.25], [-66.25, -78.5], [-66.35, -78.75], [-66.25, -79.0], [-66.47, -79.53], [-67.0, -79.75], [-67.25, -79.65], [-67.5, -79.75], [-67.75, -79.65], [-68.0, -79.75], [-68.53, -79.53], [-68.68, -79.18], [-68.75, -79.15], [-69.0, -79.25], [-69.25, -79.15], [-69.5, -79.25], [-69.75, -79.15], [-70.0, -79.25], [-70.25, -79.15], [-70.5, -79.25], [-70.75, -79.15], [-71.0, -79.25], [-71.25, -79.15], [-71.32, -79.18], [-71.47, -79.53], [-72.0, -79.75], [-72.25, -79.65], [-72.5, -79.75], [-72.75, -79.65], [-73.0, -79.75], [-73.53, -79.53], [-73.75, -79.0], [-73.53, -78.47], [-73.18, -78.32], [-73.12, -78.2], [-73.53, -78.03], [-73.68, -77.68], [-74.03, -77.53], [-74.25, -77.0]]]]}, "2016-12-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-75.03, -77.53], [-75.25, -77.0], [-75.03, -76.47], [-74.5, -76.25], [-74.25, -76.35], [-74.0, -76.25], [-73.75, -76.35], [-73.5, -76.25], [-73.25, -76.35], [-73.0, -76.25], [-72.75, -76.35], [-72.5, -76.25], [-72.25, -76.35], [-72.0, -76.25], [-71.75, -76.35], [-71.5, -76.25], [-71.0, -76.46], [-70.5, -76.25], [-70.25, -76.35], [-70.0, -76.25], [-69.75, -76.35], [-69.5, -76.25], [-69.25, -76.35], [-69.0, -76.25], [-68.75, -76.35], [-68.5, -76.25], [-68.25, -76.35], [-68.0, -76.25], [-67.75, -76.35], [-67.5, -76.25], [-67.25, -76.35], [-67.0, -76.25], [-66.75, -76.35], [-66.5, -76.25], [-66.0, -76.46], [-65.5, -76.25], [-65.25, -76.35], [-65.0, -76.25], [-64.47, -76.47], [-64.32, -76.82], [-64.25, -76.85], [-64.0, -76.75], [-63.75, -76.85], [-63.5, -76.75], [-63.25, -76.85], [-63.0, -76.75], [-62.47, -76.97], [-62.25, -77.5], [-62.47, -78.03], [-62.82, -78.18], [-62.85, -78.25], [-62.75, -78.5], [-62.97, -79.03], [-63.5, -79.25], [-63.75, -79.15], [-64.0, -79.25], [-64.25, -79.15], [-64.5, -79.25], [-64.75, -79.15], [-65.0, -79.25], [-65.25, -79.15], [-65.5, -79.25], [-65.75, -79.15], [-66.0, -79.25], [-66.25, -79.15], [-66.32, -79.18], [-66.47, -79.53], [-67.0, -79.75], [-67.25, -79.65], [-67.5, -79.75], [-67.75, -79.65], [-68.0, -79.75], [-68.25, -79.65], [-68.32, -79.68], [-68.47, -80.03], [-69.0, -80.25], [-69.25, -80.15], [-69.5, -80.25], [-69.75, -80.15], [-70.0, -80.25], [-70.53, -80.03], [-70.75, -79.5], [-70.65, -79.25], [-70.68, -79.18], [-70.75, -79.15], [-71.0, -79.25], [-71.25, -79.15], [-71.32, -79.18], [-71.47, -79.53], [-72.0, -79.75], [-72.25, -79.65], [-72.5, -79.75], [-72.75, -79.65], [-73.0, -79.75], [-73.53, -79.53], [-73.75, -79.0], [-73.53, -78.47], [-73.18, -78.32], [-73.12, -78.2], [-73.53, -78.03], [-73.68, -77.68], [-73.75, -77.65], [-74.0, -77.75], [-74.25, -77.65], [-74.5, -77.75], [-75.03, -77.53]]]]}, "2016-12-31T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-75.03, -77.53], [-75.25, -77.0], [-75.03, -76.47], [-74.5, -76.25], [-74.25, -76.35], [-74.0, -76.25], [-73.75, -76.35], [-73.5, -76.25], [-73.25, -76.35], [-73.0, -76.25], [-72.75, -76.35], [-72.5, -76.25], [-72.25, -76.35], [-72.0, -76.25], [-71.75, -76.35], [-71.5, -76.25], [-71.0, -76.46], [-70.5, -76.25], [-70.25, -76.35], [-70.0, -76.25], [-69.75, -76.35], [-69.5, -76.25], [-69.25, -76.35], [-69.0, -76.25], [-68.75, -76.35], [-68.5, -76.25], [-68.25, -76.35], [-68.0, -76.25], [-67.75, -76.35], [-67.5, -76.25], [-67.25, -76.35], [-67.0, -76.25], [-66.75, -76.35], [-66.5, -76.25], [-66.0, -76.46], [-65.5, -76.25], [-65.25, -76.35], [-65.0, -76.25], [-64.47, -76.47], [-64.32, -76.82], [-64.25, -76.85], [-64.0, -76.75], [-63.75, -76.85], [-63.5, -76.75], [-63.25, -76.85], [-63.0, -76.75], [-62.47, -76.97], [-62.25, -77.5], [-62.47, -78.03], [-62.82, -78.18], [-62.85, -78.25], [-62.75, -78.5], [-62.97, -79.03], [-63.5, -79.25], [-63.75, -79.15], [-64.0, -79.25], [-64.25, -79.15], [-64.5, -79.25], [-64.75, -79.15], [-65.0, -79.25], [-65.25, -79.15], [-65.5, -79.25], [-65.75, -79.15], [-66.0, -79.25], [-66.25, -79.15], [-66.32, -79.18], [-66.47, -79.53], [-67.0, -79.75], [-67.25, -79.65], [-67.5, -79.75], [-67.75, -79.65], [-68.0, -79.75], [-68.25, -79.65], [-68.32, -79.68], [-68.47, -80.03], [-69.0, -80.25], [-69.25, -80.15], [-69.5, -80.25], [-69.75, -80.15], [-70.0, -80.25], [-70.53, -80.03], [-70.75, -79.5], [-70.65, -79.25], [-70.68, -79.18], [-70.75, -79.15], [-71.0, -79.25], [-71.25, -79.15], [-71.32, -79.18], [-71.47, -79.53], [-72.0, -79.75], [-72.25, -79.65], [-72.5, -79.75], [-72.75, -79.65], [-73.0, -79.75], [-73.53, -79.53], [-73.75, -79.0], [-73.53, -78.47], [-73.18, -78.32], [-73.12, -78.2], [-73.53, -78.03], [-73.68, -77.68], [-73.75, -77.65], [-74.0, -77.75], [-74.25, -77.65], [-74.5, -77.75], [-75.03, -77.53]]]]}, "2017-01-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-75.03, -77.53], [-75.25, -77.0], [-75.03, -76.47], [-74.5, -76.25], [-74.25, -76.35], [-74.0, -76.25], [-73.75, -76.35], [-73.5, -76.25], [-73.25, -76.35], [-73.0, -76.25], [-72.75, -76.35], [-72.5, -76.25], [-72.25, -76.35], [-72.0, -76.25], [-71.75, -76.35], [-71.5, -76.25], [-71.0, -76.46], [-70.5, -76.25], [-70.25, -76.35], [-70.0, -76.25], [-69.75, -76.35], [-69.5, -76.25], [-69.25, -76.35], [-69.0, -76.25], [-68.75, -76.35], [-68.5, -76.25], [-68.25, -76.35], [-68.0, -76.25], [-67.75, -76.35], [-67.5, -76.25], [-67.25, -76.35], [-67.0, -76.25], [-66.75, -76.35], [-66.5, -76.25], [-66.0, -76.46], [-65.5, -76.25], [-65.25, -76.35], [-65.0, -76.25], [-64.47, -76.47], [-64.32, -76.82], [-64.25, -76.85], [-64.0, -76.75], [-63.47, -76.97], [-63.32, -77.32], [-62.97, -77.47], [-62.75, -78.0], [-62.85, -78.25], [-62.75, -78.5], [-62.97, -79.03], [-63.5, -79.25], [-63.75, -79.15], [-64.0, -79.25], [-64.25, -79.15], [-64.5, -79.25], [-64.75, -79.15], [-65.0, -79.25], [-65.25, -79.15], [-65.5, -79.25], [-65.75, -79.15], [-66.0, -79.25], [-66.25, -79.15], [-66.5, -79.25], [-66.75, -79.15], [-67.0, -79.25], [-67.25, -79.15], [-67.32, -79.18], [-67.47, -79.53], [-68.0, -79.75], [-68.25, -79.65], [-68.32, -79.68], [-68.47, -80.03], [-69.0, -80.25], [-69.25, -80.15], [-69.5, -80.25], [-69.75, -80.15], [-70.0, -80.25], [-70.53, -80.03], [-70.75, -79.5], [-70.65, -79.25], [-70.75, -79.0], [-70.62, -78.7], [-70.75, -78.65], [-71.0, -78.75], [-71.25, -78.65], [-71.32, -78.68], [-71.35, -78.75], [-71.25, -79.0], [-71.47, -79.53], [-72.0, -79.75], [-72.25, -79.65], [-72.5, -79.75], [-72.75, -79.65], [-73.0, -79.75], [-73.53, -79.53], [-73.75, -79.0], [-73.53, -78.47], [-73.18, -78.32], [-73.12, -78.2], [-73.53, -78.03], [-73.68, -77.68], [-73.75, -77.65], [-74.0, -77.75], [-74.25, -77.65], [-74.5, -77.75], [-75.03, -77.53]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -5.094856366119529}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.837457859734961}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-11.848695113332894, -12.386196585428479, -11.850881385620426, -12.29268162225037]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-12.657426015337478, -12.951200995460397, -12.982592681022709, -12.889028645928136]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.7710032340799935, -4.117059065676183, -3.4719732358002444, -3.9886445189331208]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.696403010687618, -4.915488237172667, -4.283117289780137, -5.094856366119529]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3204458832730261, -1.4502446040115644, -1.2635368057659624, -1.4053707155164166]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5120240451063154, -1.5724614910419283, -1.550494811922932, -1.6048295650401856]}}