{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:26:56.364836", "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-Aug-16_to_2021-Aug-18_198.5_67.5"}, "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": 2021080000720}, "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": "August 16 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 18 2021"}, "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": 50254.934453360314}, "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": ["Bering Sea", "Chukchi Sea"]}, "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": 67.5}, "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": 198.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "198.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 192.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 199.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 64.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 68.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-08-16T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-167.53, 66.53], [-167.0, 66.75], [-166.75, 66.65], [-166.68, 66.68], [-166.53, 67.03], [-166.18, 67.18], [-166.03, 67.53], [-165.5, 67.75], [-165.25, 67.65], [-165.0, 67.75], [-164.75, 67.65], [-164.68, 67.68], [-164.53, 68.03], [-164.18, 68.18], [-164.03, 68.53], [-163.5, 68.75], [-163.25, 68.65], [-163.0, 68.75], [-162.75, 68.65], [-162.5, 68.75], [-162.25, 68.65], [-162.0, 68.75], [-161.75, 68.65], [-161.5, 68.75], [-161.25, 68.65], [-161.0, 68.75], [-160.75, 68.65], [-160.5, 68.75], [-159.97, 68.53], [-159.75, 68.0], [-159.85, 67.75], [-159.75, 67.5], [-159.85, 67.25], [-159.75, 67.0], [-159.97, 66.47], [-160.5, 66.25], [-160.75, 66.35], [-161.0, 66.25], [-161.53, 66.47], [-161.68, 66.82], [-161.75, 66.85], [-162.0, 66.75], [-162.25, 66.85], [-162.5, 66.75], [-162.75, 66.85], [-163.0, 66.75], [-163.25, 66.85], [-163.37, 66.8], [-163.25, 66.5], [-163.35, 66.25], [-163.25, 66.0], [-163.46, 65.5], [-163.25, 65.0], [-163.47, 64.47], [-164.0, 64.25], [-164.25, 64.35], [-164.5, 64.25], [-164.75, 64.35], [-165.0, 64.25], [-165.25, 64.35], [-165.5, 64.25], [-165.75, 64.35], [-166.0, 64.25], [-166.25, 64.35], [-166.5, 64.25], [-167.03, 64.47], [-167.18, 64.82], [-167.53, 64.97], [-167.75, 65.5], [-167.65, 65.75], [-167.75, 66.0], [-167.53, 66.53]]]]}, "2021-08-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-167.53, 66.53], [-167.0, 66.75], [-166.75, 66.65], [-166.68, 66.68], [-166.53, 67.03], [-166.18, 67.18], [-166.03, 67.53], [-165.5, 67.75], [-165.25, 67.65], [-165.0, 67.75], [-164.75, 67.65], [-164.68, 67.68], [-164.53, 68.03], [-164.18, 68.18], [-164.03, 68.53], [-163.5, 68.75], [-163.25, 68.65], [-163.0, 68.75], [-162.75, 68.65], [-162.5, 68.75], [-162.25, 68.65], [-162.0, 68.75], [-161.75, 68.65], [-161.5, 68.75], [-161.25, 68.65], [-161.0, 68.75], [-160.75, 68.65], [-160.5, 68.75], [-159.97, 68.53], [-159.75, 68.0], [-159.85, 67.75], [-159.75, 67.5], [-159.85, 67.25], [-159.75, 67.0], [-159.97, 66.47], [-160.5, 66.25], [-160.75, 66.35], [-161.0, 66.25], [-161.53, 66.47], [-161.68, 66.82], [-161.75, 66.85], [-162.0, 66.75], [-162.25, 66.85], [-162.5, 66.75], [-162.75, 66.85], [-163.0, 66.75], [-163.25, 66.85], [-163.37, 66.8], [-163.25, 66.5], [-163.35, 66.25], [-163.25, 66.0], [-163.46, 65.5], [-163.25, 65.0], [-163.47, 64.47], [-164.0, 64.25], [-164.25, 64.35], [-164.5, 64.25], [-164.75, 64.35], [-165.0, 64.25], [-165.25, 64.35], [-165.5, 64.25], [-165.75, 64.35], [-166.0, 64.25], [-166.25, 64.35], [-166.5, 64.25], [-167.03, 64.47], [-167.18, 64.82], [-167.53, 64.97], [-167.75, 65.5], [-167.65, 65.75], [-167.75, 66.0], [-167.53, 66.53]]]]}, "2021-08-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-167.53, 66.53], [-167.0, 66.75], [-166.75, 66.65], [-166.68, 66.68], [-166.53, 67.03], [-166.18, 67.18], [-166.03, 67.53], [-165.5, 67.75], [-165.25, 67.65], [-165.0, 67.75], [-164.75, 67.65], [-164.68, 67.68], [-164.53, 68.03], [-164.18, 68.18], [-164.03, 68.53], [-163.5, 68.75], [-163.25, 68.65], [-163.0, 68.75], [-162.75, 68.65], [-162.5, 68.75], [-162.25, 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over entire duration", "value": -6.036041591085848}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.497178901169081}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [4.979948219917617, 4.266799419144263, 4.691473846059409]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [2.6672322162756927, 2.0832278055144684, 2.668992229568346]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.264584560703263, -4.8827383428010815, -4.3442138000028985]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.519348854539317, -6.036041591085848, -5.301045384339716]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.493461109551057, -1.6957418235167978, -1.518266470934734]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.7451456181119767, -1.9350979145298897, -1.7429753969574593]}}