{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 09:08:53.107805", "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": "2017-Sep-27_to_2017-Sep-30_301.5_52.0"}, "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": 2017090000718}, "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 27 2017"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 30 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": 59934.049103770325}, "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"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.E.North-America"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["North 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": 52.0}, "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": 301.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "301.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 297.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 303.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 51.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 53.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2017-09-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-61.5, 54.25], [-61.25, 54.15], [-61.0, 54.25], [-60.47, 54.03], [-60.32, 53.68], [-60.25, 53.65], [-60.0, 53.75], [-59.75, 53.65], [-59.5, 53.75], [-58.97, 53.53], [-58.82, 53.18], [-58.75, 53.15], [-58.68, 53.18], [-58.53, 53.53], [-58.18, 53.68], [-58.03, 54.03], [-57.5, 54.25], [-57.25, 54.15], [-57.0, 54.25], [-56.75, 54.15], [-56.5, 54.25], [-55.97, 54.03], [-55.75, 53.5], [-55.96, 53.0], [-55.75, 52.5], [-55.97, 51.97], [-56.32, 51.82], [-56.47, 51.47], [-57.0, 51.25], [-57.25, 51.35], [-57.5, 51.25], [-57.75, 51.35], [-58.0, 51.25], [-58.25, 51.35], [-58.32, 51.32], [-58.47, 50.97], [-59.0, 50.75], [-59.53, 50.97], [-59.68, 51.32], [-59.75, 51.35], [-60.0, 51.25], [-60.53, 51.47], [-60.75, 52.0], [-60.62, 52.3], [-60.75, 52.35], [-61.0, 52.25], [-61.25, 52.35], [-61.5, 52.25], [-61.75, 52.35], [-62.0, 52.25], [-62.53, 52.47], [-62.75, 53.0], [-62.53, 53.53], [-62.18, 53.68], [-62.03, 54.03], [-61.5, 54.25]], [[-57.12, 52.8], [-57.25, 52.85], [-57.32, 52.82], [-57.37, 52.7], [-57.25, 52.65], [-57.18, 52.68], [-57.12, 52.8]]]]}, 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53.68], [-62.03, 54.03], [-61.5, 54.25]]]]}, "2017-09-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-61.5, 54.25], [-61.25, 54.15], [-61.0, 54.25], [-60.47, 54.03], [-60.32, 53.68], [-60.25, 53.65], [-60.0, 53.75], [-59.75, 53.65], [-59.5, 53.75], [-59.25, 53.65], [-59.0, 53.75], [-58.75, 53.65], [-58.5, 53.75], [-58.25, 53.65], [-58.18, 53.68], [-58.03, 54.03], [-57.5, 54.25], [-57.25, 54.15], [-57.0, 54.25], [-56.75, 54.15], [-56.5, 54.25], [-55.97, 54.03], [-55.75, 53.5], [-55.85, 53.25], [-55.75, 53.0], [-55.85, 52.75], [-55.75, 52.5], [-55.97, 51.97], [-56.32, 51.82], [-56.47, 51.47], [-57.0, 51.25], [-57.25, 51.35], [-57.5, 51.25], [-57.75, 51.35], [-58.0, 51.25], [-58.25, 51.35], [-58.32, 51.32], [-58.47, 50.97], [-59.0, 50.75], [-59.53, 50.97], [-59.68, 51.32], [-59.75, 51.35], [-60.0, 51.25], [-60.53, 51.47], [-60.75, 52.0], [-60.62, 52.3], [-60.75, 52.35], [-61.0, 52.25], [-61.25, 52.35], [-61.5, 52.25], [-61.75, 52.35], [-62.0, 52.25], [-62.53, 52.47], [-62.75, 53.0], [-62.53, 53.53], [-62.18, 53.68], [-62.03, 54.03], [-61.5, 54.25]]]]}, "2017-09-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-60.53, 53.53], [-60.0, 53.75], [-59.75, 53.65], [-59.5, 53.75], [-59.25, 53.65], [-59.0, 53.75], [-58.75, 53.65], [-58.5, 53.75], [-58.25, 53.65], [-58.0, 53.75], [-57.75, 53.65], [-57.5, 53.75], [-57.25, 53.65], [-57.0, 53.75], [-56.75, 53.65], [-56.5, 53.75], [-55.97, 53.53], [-55.75, 53.0], [-55.85, 52.75], [-55.75, 52.5], [-55.97, 51.97], [-56.32, 51.82], [-56.47, 51.47], [-57.0, 51.25], [-57.25, 51.35], [-57.5, 51.25], [-57.75, 51.35], [-58.0, 51.25], [-58.25, 51.35], [-58.32, 51.32], [-58.47, 50.97], [-59.0, 50.75], [-59.53, 50.97], [-59.68, 51.32], [-59.75, 51.35], [-60.0, 51.25], [-60.53, 51.47], [-60.75, 52.0], [-60.54, 52.5], [-60.75, 53.0], [-60.53, 53.53]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -5.684807334597906}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.942798499165675}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [2.5089006396391937, 2.17644354641493, 1.8134827646072154, 2.0149842978891]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [1.337305528988452, 1.4383973212611068, 0.45386169388422104, 1.2067656088789818]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.682195930582199, -4.912270439534721, -5.161955356986157, -4.952291547163008]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.0786503996212105, -5.503024020667283, -5.684807334597906, -5.204523797477464]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3401620864367345, -1.401156497565084, -1.4858906964364738, -1.4462475593358948]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5426980333605145, -1.5365171026319826, -1.6067921161757623, -1.6072548735370211]}}