{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:13:27.909961", "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-15_to_2021-Sep-19_233.0_51.5"}, "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": 2021090000555}, "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 15 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 19 2021"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 5}, "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": 51582.64954066999}, "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"]}, "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": 51.5}, "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": 233.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "233.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 229.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 233.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 51.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 55.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-125.75, 52.0], [-125.85, 51.75], [-125.75, 51.5], [-125.97, 50.97], [-126.5, 50.75], [-126.75, 50.85], [-127.0, 50.75], [-127.53, 50.97], [-127.75, 51.5], [-127.65, 51.75], [-127.68, 51.82], [-128.03, 51.97], [-128.18, 52.32], [-128.25, 52.35], [-128.5, 52.25], [-128.75, 52.35], [-129.0, 52.25], [-129.25, 52.35], [-129.5, 52.25], [-130.03, 52.47], [-130.18, 52.82], [-130.53, 52.97], [-130.68, 53.32], [-131.03, 53.47], [-131.25, 54.0], [-131.03, 54.53], [-130.68, 54.68], [-130.65, 54.75], [-130.75, 55.0], [-130.65, 55.25], [-130.75, 55.5], [-130.53, 56.03], [-130.0, 56.25], [-129.47, 56.03], [-129.32, 55.68], [-128.97, 55.53], [-128.75, 55.0], [-128.85, 54.75], [-128.82, 54.68], [-128.75, 54.65], [-128.5, 54.75], [-127.97, 54.53], [-127.82, 54.18], [-127.75, 54.15], [-127.5, 54.25], [-126.97, 54.03], [-126.82, 53.68], [-126.47, 53.53], [-126.25, 53.0], [-126.35, 52.75], [-126.32, 52.68], [-125.97, 52.53], [-125.75, 52.0]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.W.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-09-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-131.03, 53.47], [-131.25, 54.0], [-131.03, 54.53], [-130.68, 54.68], [-130.65, 54.75], [-130.75, 55.0], [-130.65, 55.25], [-130.75, 55.5], [-130.53, 56.03], [-130.0, 56.25], [-129.47, 56.03], [-129.32, 55.68], [-128.97, 55.53], [-128.75, 55.0], [-128.85, 54.75], [-128.82, 54.68], [-128.75, 54.65], [-128.5, 54.75], [-127.97, 54.53], [-127.82, 54.18], [-127.75, 54.15], [-127.5, 54.25], [-126.97, 54.03], [-126.82, 53.68], [-126.47, 53.53], [-126.25, 53.0], [-126.35, 52.75], [-126.25, 52.5], [-126.35, 52.25], [-126.25, 52.0], [-126.35, 51.75], [-126.25, 51.5], [-126.47, 50.97], [-127.0, 50.75], [-127.53, 50.97], [-127.75, 51.5], [-127.65, 51.75], [-127.68, 51.82], [-128.03, 51.97], [-128.18, 52.32], [-128.25, 52.35], [-128.5, 52.25], [-128.75, 52.35], [-129.0, 52.25], [-129.25, 52.35], [-129.5, 52.25], [-130.03, 52.47], [-130.18, 52.82], [-130.53, 52.97], [-130.68, 53.32], [-131.03, 53.47]]]]}, "2021-09-16T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-131.03, 53.47], [-131.25, 54.0], [-131.03, 54.53], [-130.68, 54.68], [-130.65, 54.75], [-130.75, 55.0], [-130.65, 55.25], [-130.75, 55.5], [-130.53, 56.03], [-130.0, 56.25], [-129.47, 56.03], [-129.32, 55.68], [-128.97, 55.53], [-128.75, 55.0], [-128.85, 54.75], [-128.82, 54.68], [-128.75, 54.65], [-128.5, 54.75], [-127.97, 54.53], [-127.82, 54.18], [-127.75, 54.15], [-127.5, 54.25], [-126.97, 54.03], [-126.82, 53.68], [-126.47, 53.53], [-126.25, 53.0], [-126.35, 52.75], [-126.32, 52.68], [-125.97, 52.53], [-125.75, 52.0], [-125.85, 51.75], [-125.75, 51.5], [-125.97, 50.97], [-126.5, 50.75], [-126.75, 50.85], [-127.0, 50.75], [-127.53, 50.97], [-127.75, 51.5], [-127.65, 51.75], [-127.68, 51.82], [-128.03, 51.97], [-128.18, 52.32], [-128.25, 52.35], [-128.5, 52.25], [-128.75, 52.35], [-129.0, 52.25], [-129.25, 52.35], [-129.5, 52.25], [-130.03, 52.47], [-130.18, 52.82], [-130.53, 52.97], [-130.68, 53.32], [-131.03, 53.47]]]]}, "2021-09-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-131.03, 53.47], [-131.25, 54.0], [-131.03, 54.53], [-130.68, 54.68], [-130.65, 54.75], [-130.75, 55.0], [-130.65, 55.25], [-130.75, 55.5], [-130.53, 56.03], [-130.0, 56.25], [-129.47, 56.03], [-129.32, 55.68], [-128.97, 55.53], [-128.75, 55.0], [-128.85, 54.75], [-128.82, 54.68], [-128.75, 54.65], [-128.5, 54.75], [-127.97, 54.53], [-127.82, 54.18], [-127.75, 54.15], [-127.5, 54.25], [-126.97, 54.03], [-126.82, 53.68], [-126.47, 53.53], [-126.25, 53.0], [-126.35, 52.75], [-126.32, 52.68], [-125.97, 52.53], [-125.75, 52.0], [-125.85, 51.75], [-125.75, 51.5], [-125.97, 50.97], [-126.5, 50.75], [-126.75, 50.85], [-127.0, 50.75], [-127.53, 50.97], [-127.75, 51.5], [-127.65, 51.75], [-127.68, 51.82], [-128.03, 51.97], [-128.18, 52.32], [-128.25, 52.35], [-128.5, 52.25], [-128.75, 52.35], [-129.0, 52.25], [-129.25, 52.35], [-129.5, 52.25], [-130.03, 52.47], [-130.18, 52.82], [-130.53, 52.97], [-130.68, 53.32], [-131.03, 53.47]]]]}, "2021-09-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-127.5, 52.25], [-128.03, 52.47], [-128.25, 53.0], [-128.03, 53.53], [-127.5, 53.75], [-126.97, 53.53], [-126.75, 53.0], [-126.93, 52.57], [-126.5, 52.75], [-125.97, 52.53], [-125.75, 52.0], [-125.85, 51.75], [-125.75, 51.5], [-125.97, 50.97], [-126.5, 50.75], [-126.75, 50.85], [-127.0, 50.75], [-127.53, 50.97], [-127.75, 51.5], [-127.53, 52.03], [-127.18, 52.18], [-127.07, 52.43], [-127.5, 52.25]]], [[[-130.03, 55.53], [-129.5, 55.75], [-128.97, 55.53], [-128.75, 55.0], [-128.85, 54.75], [-128.75, 54.5], [-128.97, 53.97], [-129.5, 53.75], [-130.03, 53.97], [-130.25, 54.5], [-130.15, 54.75], [-130.25, 55.0], [-130.03, 55.53]]]]}, "2021-09-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-127.25, 52.0], [-127.03, 52.53], [-126.5, 52.75], [-125.97, 52.53], [-125.75, 52.0], [-125.85, 51.75], 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-3.1458086810452386, -3.4158830530024056, -3.743965852063449, -4.026464865827506]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.016127644676146, -4.357910389971835, -4.315160722921803, -4.744837613048219, -4.1166716213055]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.369223602363022, -1.462164132826875, -1.6383468267298908, -1.3934979702207124, -1.3204794071626726]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5854635354237967, -1.729226405087186, -2.225140338842184, -1.5649389348074336, -1.340407019023357]}}