{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:27:15.822204", "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-20_to_2021-Sep-23_208.0_66.0"}, "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": 2021090000604}, "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 20 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 23 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": 59333.3453630516}, "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"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.W.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": 66.0}, "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": 208.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "208.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 202.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 210.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 64.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 67.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-09-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-158.03, 65.47], [-158.25, 66.0], [-158.03, 66.53], [-157.5, 66.75], [-157.25, 66.65], [-157.0, 66.75], [-156.75, 66.65], [-156.68, 66.68], [-156.53, 67.03], [-156.0, 67.25], [-155.75, 67.15], [-155.5, 67.25], [-155.25, 67.15], [-155.0, 67.25], [-154.75, 67.15], [-154.5, 67.25], [-154.25, 67.15], [-154.0, 67.25], [-153.75, 67.15], [-153.5, 67.25], [-153.25, 67.15], [-153.0, 67.25], [-152.75, 67.15], [-152.5, 67.25], [-152.25, 67.15], [-152.0, 67.25], [-151.75, 67.15], [-151.68, 67.18], [-151.53, 67.53], [-151.0, 67.75], [-150.75, 67.65], [-150.5, 67.75], [-150.25, 67.65], [-150.0, 67.75], [-149.47, 67.53], [-149.25, 67.0], [-149.35, 66.75], [-149.25, 66.5], [-149.47, 65.97], [-150.0, 65.75], [-150.25, 65.85], [-150.32, 65.82], [-150.47, 65.47], [-151.0, 65.25], [-151.25, 65.35], [-151.32, 65.32], [-151.47, 64.97], [-152.0, 64.75], [-152.25, 64.85], [-152.5, 64.75], [-152.75, 64.85], [-153.0, 64.75], [-153.25, 64.85], [-153.32, 64.82], [-153.47, 64.47], [-154.0, 64.25], [-154.25, 64.35], [-154.32, 64.32], [-154.47, 63.97], [-155.0, 63.75], [-155.25, 63.85], [-155.5, 63.75], [-155.75, 63.85], [-156.0, 63.75], [-156.53, 63.97], [-156.68, 64.32], [-157.03, 64.47], [-157.25, 65.0], [-157.12, 65.3], [-157.25, 65.35], [-157.5, 65.25], [-158.03, 65.47]]]]}, "2021-09-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-158.03, 65.47], [-158.25, 66.0], [-158.03, 66.53], [-157.5, 66.75], [-157.25, 66.65], [-157.0, 66.75], [-156.75, 66.65], [-156.68, 66.68], [-156.53, 67.03], [-156.0, 67.25], [-155.75, 67.15], [-155.5, 67.25], [-155.25, 67.15], [-155.0, 67.25], [-154.75, 67.15], [-154.5, 67.25], [-154.25, 67.15], [-154.0, 67.25], [-153.75, 67.15], [-153.5, 67.25], [-153.25, 67.15], [-153.0, 67.25], [-152.75, 67.15], [-152.5, 67.25], [-152.25, 67.15], [-152.0, 67.25], [-151.75, 67.15], [-151.68, 67.18], [-151.53, 67.53], [-151.0, 67.75], [-150.75, 67.65], [-150.5, 67.75], [-150.25, 67.65], [-150.0, 67.75], [-149.47, 67.53], [-149.25, 67.0], [-149.35, 66.75], [-149.25, 66.5], [-149.47, 65.97], [-150.0, 65.75], [-150.25, 65.85], [-150.32, 65.82], [-150.47, 65.47], [-151.0, 65.25], [-151.25, 65.35], [-151.32, 65.32], [-151.47, 64.97], [-152.0, 64.75], [-152.25, 64.85], [-152.5, 64.75], [-152.75, 64.85], [-153.0, 64.75], [-153.25, 64.85], [-153.32, 64.82], [-153.47, 64.47], [-154.0, 64.25], [-154.25, 64.35], [-154.32, 64.32], [-154.47, 63.97], [-155.0, 63.75], [-155.25, 63.85], [-155.5, 63.75], [-155.75, 63.85], [-156.0, 63.75], [-156.53, 63.97], [-156.68, 64.32], [-157.03, 64.47], [-157.25, 65.0], [-157.12, 65.3], [-157.25, 65.35], [-157.5, 65.25], [-158.03, 65.47]]]]}, "2021-09-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-158.03, 65.47], [-158.25, 66.0], [-158.03, 66.53], [-157.5, 66.75], [-157.25, 66.65], [-157.0, 66.75], [-156.75, 66.65], [-156.68, 66.68], [-156.53, 67.03], [-156.0, 67.25], [-155.75, 67.15], [-155.5, 67.25], [-155.25, 67.15], [-155.0, 67.25], [-154.75, 67.15], [-154.5, 67.25], [-154.25, 67.15], [-154.0, 67.25], [-153.75, 67.15], [-153.5, 67.25], [-153.25, 67.15], [-153.0, 67.25], [-152.75, 67.15], [-152.5, 67.25], [-152.25, 67.15], [-152.0, 67.25], [-151.75, 67.15], [-151.68, 67.18], [-151.53, 67.53], [-151.0, 67.75], [-150.75, 67.65], [-150.5, 67.75], [-150.25, 67.65], [-150.0, 67.75], [-149.47, 67.53], [-149.25, 67.0], [-149.35, 66.75], [-149.25, 66.5], [-149.47, 65.97], [-150.0, 65.75], [-150.25, 65.85], [-150.32, 65.82], [-150.47, 65.47], [-151.0, 65.25], [-151.25, 65.35], [-151.32, 65.32], [-151.47, 64.97], [-152.0, 64.75], [-152.25, 64.85], [-152.5, 64.75], [-152.75, 64.85], [-153.0, 64.75], [-153.25, 64.85], [-153.32, 64.82], [-153.47, 64.47], [-154.0, 64.25], [-154.25, 64.35], [-154.32, 64.32], [-154.47, 63.97], [-155.0, 63.75], [-155.25, 63.85], [-155.5, 63.75], [-155.75, 63.85], [-156.0, 63.75], [-156.53, 63.97], [-156.68, 64.32], [-157.03, 64.47], [-157.25, 65.0], [-157.12, 65.3], [-157.25, 65.35], [-157.5, 65.25], [-158.03, 65.47]]]]}, "2021-09-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-152.0, 66.75], [-151.47, 66.53], [-151.25, 66.0], [-151.47, 65.47], [-152.0, 65.25], [-152.53, 65.47], [-152.75, 66.0], [-152.53, 66.53], [-152.0, 66.75]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -7.46866152623636}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.411581283188927}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-1.568593374660793, -1.7959561627481548, -2.022415786901547, -2.1017628135353448]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-5.949116425142222, -6.461002464943078, -6.157060357009925, -2.1017628135353448]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.590114310145426, -5.416696157357778, -5.249254896796118, -4.409470090759783]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.817048724048448, -7.46866152623636, -6.203398108192914, -4.409470090759783]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5912410911830004, -1.5358945276510338, -1.4884225939504525, -1.241967328486156]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.8530514699560858, -1.9824179994921045, -1.6234799317985815, -1.241967328486156]}}