{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:59:00.848407", "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": "2026-Mar-31_to_2026-Apr-02_280.5_53.5"}, "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": 2026030000818}, "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": "March 31 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 02 2026"}, "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": 60188.71364594356}, "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": ["Hudson Bay"]}, "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": 53.5}, "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": 280.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "280.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 279.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 283.75}, "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": 54.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-03-31T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-81.15, 52.25], [-81.25, 52.5], [-81.15, 52.75], [-81.25, 53.0], [-81.03, 53.53], [-80.68, 53.68], [-80.65, 53.75], [-80.75, 54.0], [-80.53, 54.53], [-80.0, 54.75], [-79.75, 54.65], [-79.5, 54.75], [-79.25, 54.65], [-79.0, 54.75], [-78.47, 54.53], [-78.25, 54.0], [-78.35, 53.75], [-78.25, 53.5], [-78.35, 53.25], [-78.32, 53.18], [-77.97, 53.03], [-77.82, 52.68], [-77.75, 52.65], [-77.68, 52.68], [-77.53, 53.03], [-77.18, 53.18], [-77.03, 53.53], [-76.5, 53.75], [-75.97, 53.53], [-75.75, 53.0], [-75.85, 52.75], [-75.75, 52.5], [-75.85, 52.25], [-75.75, 52.0], [-75.97, 51.47], [-76.5, 51.25], [-76.75, 51.35], [-77.0, 51.25], [-77.25, 51.35], [-77.5, 51.25], [-77.75, 51.35], [-77.82, 51.32], [-77.97, 50.97], [-78.5, 50.75], [-78.75, 50.85], [-79.0, 50.75], [-79.25, 50.85], [-79.5, 50.75], [-79.75, 50.85], [-80.0, 50.75], [-80.25, 50.85], [-80.5, 50.75], [-81.03, 50.97], [-81.25, 51.5], [-81.15, 51.75], [-81.25, 52.0], [-81.15, 52.25]]]]}, "2026-04-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-81.15, 52.25], [-81.25, 52.5], [-81.15, 52.75], [-81.25, 53.0], [-81.03, 53.53], [-80.68, 53.68], [-80.65, 53.75], [-80.75, 54.0], [-80.53, 54.53], [-80.0, 54.75], [-79.75, 54.65], [-79.5, 54.75], [-79.25, 54.65], [-79.0, 54.75], [-78.47, 54.53], [-78.25, 54.0], [-78.35, 53.75], [-78.25, 53.5], [-78.35, 53.25], [-78.32, 53.18], [-77.97, 53.03], [-77.82, 52.68], [-77.75, 52.65], [-77.68, 52.68], [-77.53, 53.03], [-77.18, 53.18], [-77.03, 53.53], [-76.5, 53.75], [-75.97, 53.53], [-75.75, 53.0], [-75.85, 52.75], [-75.75, 52.5], [-75.85, 52.25], [-75.75, 52.0], [-75.97, 51.47], [-76.5, 51.25], [-76.75, 51.35], [-77.0, 51.25], [-77.25, 51.35], [-77.5, 51.25], [-77.75, 51.35], [-77.82, 51.32], [-77.97, 50.97], [-78.5, 50.75], [-78.75, 50.85], [-79.0, 50.75], [-79.25, 50.85], [-79.5, 50.75], [-79.75, 50.85], [-80.0, 50.75], [-80.25, 50.85], [-80.5, 50.75], [-81.03, 50.97], [-81.25, 51.5], [-81.15, 51.75], [-81.25, 52.0], [-81.15, 52.25]]]]}, "2026-04-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-81.15, 52.25], [-81.25, 52.5], [-81.15, 52.75], [-81.25, 53.0], [-81.03, 53.53], [-80.68, 53.68], [-80.65, 53.75], [-80.75, 54.0], [-80.53, 54.53], [-80.0, 54.75], [-79.75, 54.65], [-79.5, 54.75], [-79.25, 54.65], [-79.0, 54.75], [-78.47, 54.53], [-78.25, 54.0], [-78.35, 53.75], [-78.25, 53.5], [-78.35, 53.25], [-78.32, 53.18], [-77.97, 53.03], [-77.82, 52.68], [-77.75, 52.65], [-77.68, 52.68], [-77.53, 53.03], [-77.18, 53.18], [-77.03, 53.53], [-76.5, 53.75], [-75.97, 53.53], [-75.75, 53.0], [-75.85, 52.75], [-75.75, 52.5], [-75.85, 52.25], [-75.75, 52.0], [-75.97, 51.47], [-76.5, 51.25], [-76.75, 51.35], [-77.0, 51.25], [-77.25, 51.35], [-77.5, 51.25], [-77.75, 51.35], [-77.82, 51.32], [-77.97, 50.97], [-78.5, 50.75], [-78.75, 50.85], [-79.0, 50.75], [-79.25, 50.85], [-79.5, 50.75], [-79.75, 50.85], [-80.0, 50.75], [-80.25, 50.85], [-80.5, 50.75], [-81.03, 50.97], [-81.25, 51.5], [-81.15, 51.75], [-81.25, 52.0], [-81.15, 52.25]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -13.4341815182363}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -9.606168579163302}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-17.11495195229844, -18.927051687240578, -16.27070782979331]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-21.616314951578744, -23.065599822998024, -18.005710347493476]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-9.028881314929748, -11.102684157898201, -8.686940264661962]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-11.771443425136027, -13.4341815182363, -9.612328689623268]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5400624685866313, -1.941467999378456, -1.543549815089862]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.9651039824843948, -2.2646003223371505, -1.779007770084277]}}