{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:25:09.052371", "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-Apr-11_to_2021-Apr-15_255.0_72.0"}, "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": 2021040000486}, "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": "April 11 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 15 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": 107532.16400907218}, "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", "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": ["The Northwestern Passages"]}, "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": 72.0}, "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": 255.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "255.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 251.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 258.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 68.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 74.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-04-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-108.65, 70.25], [-108.75, 70.5], [-108.53, 71.03], [-108.18, 71.18], [-108.15, 71.25], [-108.18, 71.32], [-108.53, 71.47], [-108.75, 72.0], [-108.53, 72.53], [-108.18, 72.68], [-108.03, 73.03], [-107.5, 73.25], [-107.25, 73.15], [-107.18, 73.18], [-107.15, 73.25], [-107.25, 73.5], [-107.03, 74.03], [-106.5, 74.25], [-106.25, 74.15], [-106.18, 74.18], [-106.03, 74.53], [-105.5, 74.75], [-105.25, 74.65], [-105.0, 74.75], [-104.75, 74.65], [-104.68, 74.68], [-104.53, 75.03], [-104.0, 75.25], [-103.75, 75.15], [-103.5, 75.25], [-103.25, 75.15], [-103.0, 75.25], [-102.47, 75.03], [-102.25, 74.5], [-102.35, 74.25], [-102.25, 74.0], [-102.35, 73.75], [-102.25, 73.5], [-102.35, 73.25], [-102.32, 73.18], [-101.97, 73.03], [-101.75, 72.5], [-101.85, 72.25], [-101.75, 72.0], [-101.97, 71.47], [-102.5, 71.25], [-102.75, 71.35], [-103.0, 71.25], [-103.25, 71.35], [-103.32, 71.32], [-103.35, 71.25], [-103.25, 71.0], [-103.46, 70.5], [-103.3, 70.13], [-103.0, 70.25], [-102.47, 70.03], [-102.25, 69.5], [-102.37, 69.2], [-101.97, 69.03], [-101.75, 68.5], [-101.97, 67.97], [-102.5, 67.75], [-102.75, 67.85], [-103.0, 67.75], [-103.5, 67.96], [-104.0, 67.75], [-104.25, 67.85], [-104.5, 67.75], [-104.75, 67.85], [-105.0, 67.75], [-105.25, 67.85], [-105.5, 67.75], [-105.75, 67.85], [-106.0, 67.75], [-106.53, 67.97], [-106.75, 68.5], [-106.65, 68.75], [-106.68, 68.82], [-106.75, 68.85], [-107.0, 68.75], [-107.25, 68.85], [-107.5, 68.75], [-107.75, 68.85], [-108.0, 68.75], [-108.53, 68.97], [-108.75, 69.5], [-108.65, 69.75], [-108.75, 70.0], [-108.65, 70.25]]]]}, "2021-04-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-108.65, 70.25], [-108.75, 70.5], [-108.53, 71.03], [-108.18, 71.18], [-108.15, 71.25], [-108.18, 71.32], [-108.53, 71.47], [-108.75, 72.0], [-108.53, 72.53], [-108.18, 72.68], [-108.03, 73.03], [-107.5, 73.25], [-107.25, 73.15], [-107.18, 73.18], [-107.15, 73.25], [-107.25, 73.5], [-107.03, 74.03], [-106.5, 74.25], [-106.25, 74.15], [-106.18, 74.18], [-106.03, 74.53], [-105.5, 74.75], [-105.25, 74.65], [-105.0, 74.75], [-104.75, 74.65], [-104.68, 74.68], [-104.53, 75.03], [-104.0, 75.25], [-103.75, 75.15], [-103.5, 75.25], [-103.25, 75.15], [-103.0, 75.25], [-102.75, 75.15], [-102.5, 75.25], [-101.97, 75.03], [-101.75, 74.5], [-101.85, 74.25], [-101.75, 74.0], [-101.85, 73.75], [-101.82, 73.68], [-101.47, 73.53], [-101.25, 73.0], [-101.47, 72.47], [-101.82, 72.32], [-101.85, 72.25], [-101.75, 72.0], [-101.97, 71.47], [-102.5, 71.25], [-102.75, 71.35], [-103.0, 71.25], [-103.25, 71.35], [-103.32, 71.32], [-103.35, 71.25], [-103.25, 71.0], [-103.46, 70.5], [-103.3, 70.13], [-103.0, 70.25], [-102.47, 70.03], [-102.25, 69.5], [-102.37, 69.2], [-101.97, 69.03], [-101.75, 68.5], [-101.97, 67.97], [-102.5, 67.75], [-102.75, 67.85], [-103.0, 67.75], [-103.5, 67.96], [-104.0, 67.75], [-104.25, 67.85], [-104.5, 67.75], [-104.75, 67.85], [-105.0, 67.75], [-105.25, 67.85], [-105.5, 67.75], [-105.75, 67.85], [-106.0, 67.75], [-106.53, 67.97], [-106.75, 68.5], [-106.65, 68.75], [-106.68, 68.82], [-106.75, 68.85], [-107.0, 68.75], [-107.25, 68.85], [-107.5, 68.75], [-107.75, 68.85], [-108.0, 68.75], [-108.53, 68.97], [-108.75, 69.5], [-108.65, 69.75], [-108.75, 70.0], [-108.65, 70.25]]]]}, "2021-04-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-108.65, 70.25], [-108.75, 70.5], [-108.53, 71.03], [-108.18, 71.18], [-108.15, 71.25], [-108.18, 71.32], [-108.53, 71.47], [-108.75, 72.0], [-108.53, 72.53], [-108.18, 72.68], [-108.03, 73.03], [-107.5, 73.25], [-107.25, 73.15], [-107.18, 73.18], [-107.15, 73.25], [-107.25, 73.5], [-107.03, 74.03], [-106.5, 74.25], [-106.25, 74.15], [-106.18, 74.18], [-106.03, 74.53], [-105.5, 74.75], [-105.25, 74.65], [-105.0, 74.75], [-104.75, 74.65], [-104.68, 74.68], [-104.53, 75.03], [-104.0, 75.25], [-103.75, 75.15], [-103.5, 75.25], [-103.25, 75.15], [-103.0, 75.25], [-102.75, 75.15], [-102.5, 75.25], [-102.25, 75.15], [-102.0, 75.25], [-101.75, 75.15], [-101.5, 75.25], [-100.97, 75.03], [-100.75, 74.5], [-100.97, 73.97], [-101.5, 73.75], [-101.75, 73.85], [-101.82, 73.82], [-101.85, 73.75], [-101.82, 73.68], [-101.47, 73.53], [-101.25, 73.0], [-101.47, 72.47], [-101.82, 72.32], [-101.85, 72.25], [-101.75, 72.0], [-101.97, 71.47], [-102.5, 71.25], [-102.75, 71.35], [-103.0, 71.25], [-103.25, 71.35], [-103.32, 71.32], [-103.35, 71.25], [-103.25, 71.0], [-103.46, 70.5], [-103.3, 70.13], [-103.0, 70.25], [-102.47, 70.03], [-102.25, 69.5], [-102.37, 69.2], [-101.97, 69.03], [-101.75, 68.5], [-101.97, 67.97], [-102.5, 67.75], [-102.75, 67.85], [-103.0, 67.75], [-103.5, 67.96], [-104.0, 67.75], [-104.25, 67.85], [-104.5, 67.75], [-104.75, 67.85], [-105.0, 67.75], [-105.25, 67.85], [-105.5, 67.75], [-105.75, 67.85], [-106.0, 67.75], [-106.53, 67.97], [-106.75, 68.5], [-106.65, 68.75], [-106.68, 68.82], [-106.75, 68.85], [-107.0, 68.75], [-107.25, 68.85], [-107.5, 68.75], [-107.75, 68.85], [-108.0, 68.75], [-108.53, 68.97], [-108.75, 69.5], [-108.65, 69.75], [-108.75, 70.0], [-108.65, 70.25]]]]}, "2021-04-14T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-108.18, 71.32], [-108.53, 71.47], [-108.75, 72.0], [-108.53, 72.53], [-108.18, 72.68], [-108.03, 73.03], [-107.5, 73.25], [-107.25, 73.15], [-107.12, 73.2], [-107.25, 73.5], [-107.03, 74.03], [-106.5, 74.25], [-106.25, 74.15], [-106.18, 74.18], [-106.03, 74.53], [-105.5, 74.75], [-105.25, 74.65], [-105.0, 74.75], [-104.75, 74.65], [-104.68, 74.68], [-104.53, 75.03], [-104.0, 75.25], [-103.75, 75.15], [-103.5, 75.25], [-103.25, 75.15], [-103.0, 75.25], [-102.75, 75.15], [-102.5, 75.25], [-102.25, 75.15], [-102.0, 75.25], [-101.75, 75.15], [-101.5, 75.25], [-100.97, 75.03], [-100.75, 74.5], [-100.97, 73.97], [-101.5, 73.75], [-101.75, 73.85], [-101.82, 73.82], [-101.85, 73.75], [-101.82, 73.68], [-101.47, 73.53], [-101.25, 73.0], [-101.47, 72.47], [-101.82, 72.32], [-101.97, 71.97], [-102.32, 71.82], [-102.47, 71.47], [-103.0, 71.25], [-103.25, 71.35], [-103.5, 71.25], [-103.75, 71.35], [-103.82, 71.32], [-103.85, 71.25], [-103.75, 71.0], [-103.97, 70.47], [-104.32, 70.32], [-104.47, 69.97], [-105.0, 69.75], [-105.25, 69.85], [-105.5, 69.75], [-105.75, 69.85], [-106.0, 69.75], [-106.25, 69.85], [-106.5, 69.75], [-106.75, 69.85], [-107.0, 69.75], [-107.25, 69.85], [-107.5, 69.75], [-107.75, 69.85], [-108.0, 69.75], [-108.53, 69.97], [-108.75, 70.5], [-108.53, 71.03], [-108.18, 71.18], [-108.15, 71.25], [-108.18, 71.32]]]]}, "2021-04-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-104.53, 73.97], [-104.75, 74.5], [-104.53, 75.03], [-104.0, 75.25], [-103.75, 75.15], [-103.5, 75.25], [-103.25, 75.15], [-103.0, 75.25], [-102.75, 75.15], [-102.5, 75.25], [-102.25, 75.15], [-102.0, 75.25], [-101.75, 75.15], [-101.5, 75.25], [-100.97, 75.03], [-100.75, 74.5], [-100.97, 73.97], [-101.5, 73.75], [-101.75, 73.85], [-101.82, 73.82], [-101.97, 73.47], [-102.5, 73.25], [-102.75, 73.35], [-103.0, 73.25], [-103.53, 73.47], [-103.68, 73.82], [-103.75, 73.85], [-104.0, 73.75], [-104.53, 73.97]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -10.87184068048964}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -6.733805418059546}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-26.436901924129785, -26.295159805272675, -26.723636036162617, -25.382955827159833, -21.869915716340472]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-29.36071147004307, -30.349159875824483, -31.61088883177294, -29.68199972081956, -22.027129339772927]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-6.498510271368886, -6.712528444240271, -7.475156351629866, -6.225881565115513, -4.4916993997846255]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-7.696229079110168, -9.218139960930387, -10.87184068048964, -9.24073102078404, -4.608516091515355]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.534021243149984, -1.6077481926912294, -1.817389290081501, -1.5902475280813062, -1.3678201608776879]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.797923051344097, -2.0552216997723374, -2.5104097116397255, -2.014297399958396, -1.3948005956517444]}}