{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 08:50:12.279951", "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": "2012-Apr-27_to_2012-Apr-29_282.5_50.0"}, "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": 2012040001386}, "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 27 2012"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 29 2012"}, "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": 363360.8154998849}, "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", "United States"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.North-America", "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": 50.0}, "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": 282.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "282.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 278.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 287.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 40.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 51.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2012-04-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-81.75, 51.0], [-81.65, 51.25], [-81.75, 51.5], [-81.53, 52.03], [-81.0, 52.25], [-80.47, 52.03], [-80.32, 51.68], [-80.25, 51.65], [-80.0, 51.75], [-79.75, 51.65], [-79.68, 51.68], [-79.53, 52.03], [-79.0, 52.25], [-78.75, 52.15], [-78.5, 52.25], [-78.25, 52.15], [-78.0, 52.25], [-77.75, 52.15], [-77.5, 52.25], [-77.25, 52.15], [-77.0, 52.25], [-76.75, 52.15], [-76.5, 52.25], [-75.97, 52.03], [-75.82, 51.68], [-75.47, 51.53], [-75.32, 51.18], [-75.25, 51.15], [-75.0, 51.25], [-74.47, 51.03], [-74.32, 50.68], [-73.97, 50.53], [-73.75, 50.0], [-73.85, 49.75], [-73.75, 49.5], [-73.85, 49.25], [-73.75, 49.0], [-73.85, 48.75], [-73.82, 48.68], [-73.47, 48.53], [-73.32, 48.18], [-72.97, 48.03], [-72.82, 47.68], [-72.47, 47.53], [-72.25, 47.0], [-72.47, 46.47], [-72.82, 46.32], [-72.97, 45.97], [-73.32, 45.82], [-73.35, 45.75], [-73.32, 45.68], [-73.25, 45.65], [-73.0, 45.75], [-72.47, 45.53], [-72.25, 45.0], [-72.35, 44.75], [-72.25, 44.5], [-72.47, 43.97], [-73.0, 43.75], [-73.25, 43.85], [-73.32, 43.82], [-73.35, 43.75], [-73.25, 43.5], [-73.47, 42.97], [-73.87, 42.8], [-73.75, 42.5], [-73.97, 41.97], [-74.32, 41.82], [-74.47, 41.47], [-75.0, 41.25], [-75.25, 41.35], [-75.5, 41.25], [-75.75, 41.35], [-76.0, 41.25], [-76.25, 41.35], [-76.5, 41.25], [-77.03, 41.47], [-77.2, 41.88], [-77.5, 41.75], [-77.75, 41.85], [-78.0, 41.75], [-78.25, 41.85], [-78.32, 41.82], [-78.35, 41.75], [-78.25, 41.5], [-78.35, 41.25], [-78.25, 41.0], [-78.47, 40.47], [-79.0, 40.25], [-79.25, 40.35], [-79.5, 40.25], [-79.75, 40.35], [-80.0, 40.25], [-80.5, 40.46], [-81.0, 40.25], [-81.53, 40.47], [-81.75, 41.0], [-81.53, 41.53], [-81.18, 41.68], [-81.03, 42.03], [-80.5, 42.25], [-80.25, 42.15], [-80.18, 42.18], [-80.03, 42.53], [-79.68, 42.68], [-79.53, 43.03], [-79.18, 43.18], [-79.03, 43.53], [-78.5, 43.75], [-78.25, 43.65], [-78.0, 43.75], [-77.75, 43.65], [-77.5, 43.75], [-77.25, 43.65], [-77.0, 43.75], [-76.75, 43.65], [-76.68, 43.68], [-76.53, 44.03], [-76.18, 44.18], [-76.03, 44.53], [-75.68, 44.68], [-75.65, 44.75], [-75.68, 44.82], [-75.75, 44.85], [-76.0, 44.75], [-76.25, 44.85], [-76.5, 44.75], [-77.03, 44.97], [-77.25, 45.5], [-77.15, 45.75], [-77.18, 45.82], [-77.25, 45.85], [-77.5, 45.75], [-78.03, 45.97], [-78.25, 46.5], [-78.15, 46.75], [-78.25, 47.0], [-78.04, 47.5], [-78.18, 47.82], [-78.53, 47.97], [-78.68, 48.32], [-79.03, 48.47], [-79.18, 48.82], [-79.25, 48.85], [-79.5, 48.75], [-79.75, 48.85], [-80.0, 48.75], [-80.25, 48.85], [-80.5, 48.75], [-81.03, 48.97], [-81.18, 49.32], [-81.25, 49.35], [-81.5, 49.25], [-82.03, 49.47], [-82.25, 50.0], [-82.03, 50.53], [-81.68, 50.68], [-81.65, 50.75], [-81.75, 51.0]]]]}, "2012-04-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-81.75, 51.0], [-81.65, 51.25], [-81.75, 51.5], [-81.53, 52.03], [-81.0, 52.25], [-80.47, 52.03], [-80.32, 51.68], [-80.25, 51.65], [-80.0, 51.75], [-79.75, 51.65], [-79.68, 51.68], [-79.53, 52.03], [-79.0, 52.25], [-78.75, 52.15], [-78.5, 52.25], [-78.25, 52.15], [-78.0, 52.25], [-77.75, 52.15], [-77.5, 52.25], [-77.25, 52.15], [-77.0, 52.25], [-76.75, 52.15], [-76.5, 52.25], [-75.97, 52.03], [-75.82, 51.68], [-75.47, 51.53], [-75.32, 51.18], [-75.25, 51.15], [-75.0, 51.25], [-74.47, 51.03], [-74.32, 50.68], [-73.97, 50.53], [-73.75, 50.0], [-73.85, 49.75], [-73.75, 49.5], [-73.85, 49.25], [-73.75, 49.0], [-73.85, 48.75], [-73.82, 48.68], [-73.47, 48.53], [-73.32, 48.18], [-72.97, 48.03], [-72.82, 47.68], [-72.47, 47.53], [-72.25, 47.0], [-72.47, 46.47], [-72.82, 46.32], [-72.97, 45.97], [-73.32, 45.82], [-73.35, 45.75], [-73.32, 45.68], [-73.25, 45.65], [-73.0, 45.75], [-72.47, 45.53], [-72.25, 45.0], [-72.35, 44.75], [-72.25, 44.5], [-72.47, 43.97], [-73.0, 43.75], [-73.25, 43.85], [-73.32, 43.82], [-73.35, 43.75], [-73.25, 43.5], [-73.47, 42.97], [-73.87, 42.8], [-73.75, 42.5], [-73.97, 41.97], [-74.32, 41.82], [-74.47, 41.47], [-75.0, 41.25], [-75.25, 41.35], [-75.5, 41.25], [-75.75, 41.35], [-76.0, 41.25], [-76.25, 41.35], [-76.5, 41.25], [-77.03, 41.47], [-77.2, 41.88], [-77.5, 41.75], [-77.75, 41.85], [-78.0, 41.75], [-78.25, 41.85], [-78.32, 41.82], [-78.35, 41.75], [-78.25, 41.5], [-78.35, 41.25], [-78.25, 41.0], [-78.47, 40.47], [-79.0, 40.25], [-79.25, 40.35], [-79.5, 40.25], [-79.75, 40.35], [-80.0, 40.25], [-80.5, 40.46], [-81.0, 40.25], [-81.53, 40.47], [-81.75, 41.0], [-81.53, 41.53], [-81.18, 41.68], [-81.03, 42.03], [-80.5, 42.25], [-80.25, 42.15], [-80.18, 42.18], [-80.03, 42.53], [-79.68, 42.68], [-79.53, 43.03], [-79.18, 43.18], [-79.03, 43.53], [-78.5, 43.75], [-78.25, 43.65], [-78.0, 43.75], [-77.75, 43.65], [-77.5, 43.75], [-77.25, 43.65], [-77.0, 43.75], [-76.75, 43.65], [-76.68, 43.68], [-76.53, 44.03], [-76.18, 44.18], [-76.03, 44.53], [-75.68, 44.68], [-75.65, 44.75], [-75.68, 44.82], [-75.75, 44.85], [-76.0, 44.75], [-76.25, 44.85], [-76.5, 44.75], [-77.03, 44.97], [-77.25, 45.5], [-77.15, 45.75], [-77.18, 45.82], [-77.25, 45.85], [-77.5, 45.75], [-78.03, 45.97], [-78.25, 46.5], [-78.15, 46.75], [-78.25, 47.0], [-78.04, 47.5], [-78.18, 47.82], [-78.53, 47.97], [-78.68, 48.32], [-79.03, 48.47], [-79.18, 48.82], [-79.25, 48.85], [-79.5, 48.75], [-79.75, 48.85], [-80.0, 48.75], [-80.25, 48.85], [-80.5, 48.75], [-81.03, 48.97], [-81.18, 49.32], [-81.25, 49.35], [-81.5, 49.25], [-82.03, 49.47], [-82.25, 50.0], [-82.03, 50.53], [-81.68, 50.68], [-81.65, 50.75], [-81.75, 51.0]]]]}, "2012-04-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-81.75, 51.0], [-81.65, 51.25], [-81.75, 51.5], [-81.53, 52.03], [-81.0, 52.25], [-80.47, 52.03], [-80.32, 51.68], [-80.25, 51.65], [-80.0, 51.75], [-79.75, 51.65], [-79.68, 51.68], [-79.53, 52.03], [-79.0, 52.25], [-78.75, 52.15], [-78.5, 52.25], [-78.25, 52.15], [-78.0, 52.25], [-77.75, 52.15], [-77.5, 52.25], [-77.25, 52.15], [-77.0, 52.25], [-76.75, 52.15], [-76.5, 52.25], [-75.97, 52.03], [-75.82, 51.68], [-75.47, 51.53], [-75.32, 51.18], [-75.25, 51.15], [-75.0, 51.25], [-74.47, 51.03], [-74.32, 50.68], [-73.97, 50.53], [-73.75, 50.0], [-73.85, 49.75], [-73.75, 49.5], [-73.85, 49.25], [-73.75, 49.0], [-73.85, 48.75], [-73.82, 48.68], [-73.47, 48.53], [-73.32, 48.18], [-72.97, 48.03], [-72.82, 47.68], [-72.47, 47.53], [-72.25, 47.0], [-72.47, 46.47], [-72.82, 46.32], [-72.97, 45.97], [-73.32, 45.82], [-73.35, 45.75], [-73.32, 45.68], [-73.25, 45.65], [-73.0, 45.75], [-72.47, 45.53], [-72.25, 45.0], [-72.35, 44.75], [-72.25, 44.5], [-72.47, 43.97], [-73.0, 43.75], [-73.25, 43.85], [-73.32, 43.82], [-73.35, 43.75], [-73.25, 43.5], [-73.47, 42.97], [-73.87, 42.8], [-73.75, 42.5], [-73.97, 41.97], [-74.32, 41.82], [-74.47, 41.47], [-75.0, 41.25], [-75.25, 41.35], [-75.5, 41.25], [-75.75, 41.35], [-76.0, 41.25], [-76.25, 41.35], [-76.5, 41.25], [-77.03, 41.47], [-77.2, 41.88], [-77.5, 41.75], [-77.75, 41.85], [-78.0, 41.75], [-78.25, 41.85], [-78.32, 41.82], [-78.35, 41.75], [-78.25, 41.5], [-78.35, 41.25], [-78.25, 41.0], [-78.47, 40.47], [-79.0, 40.25], [-79.25, 40.35], [-79.5, 40.25], [-79.75, 40.35], [-80.0, 40.25], [-80.5, 40.46], [-81.0, 40.25], [-81.53, 40.47], [-81.75, 41.0], [-81.53, 41.53], [-81.18, 41.68], [-81.03, 42.03], [-80.5, 42.25], [-80.25, 42.15], [-80.18, 42.18], [-80.03, 42.53], [-79.68, 42.68], [-79.53, 43.03], [-79.18, 43.18], [-79.03, 43.53], [-78.5, 43.75], [-78.25, 43.65], [-78.0, 43.75], [-77.75, 43.65], [-77.5, 43.75], [-77.25, 43.65], [-77.0, 43.75], [-76.75, 43.65], [-76.68, 43.68], [-76.53, 44.03], [-76.18, 44.18], [-76.03, 44.53], [-75.68, 44.68], [-75.65, 44.75], [-75.68, 44.82], [-75.75, 44.85], [-76.0, 44.75], [-76.25, 44.85], [-76.5, 44.75], [-77.03, 44.97], [-77.25, 45.5], [-77.15, 45.75], [-77.18, 45.82], [-77.25, 45.85], [-77.5, 45.75], [-78.03, 45.97], [-78.25, 46.5], [-78.15, 46.75], [-78.25, 47.0], [-78.04, 47.5], [-78.18, 47.82], [-78.53, 47.97], [-78.68, 48.32], [-79.03, 48.47], [-79.18, 48.82], [-79.25, 48.85], [-79.5, 48.75], [-79.75, 48.85], [-80.0, 48.75], [-80.25, 48.85], [-80.5, 48.75], [-81.03, 48.97], [-81.18, 49.32], [-81.25, 49.35], [-81.5, 49.25], [-82.03, 49.47], [-82.25, 50.0], [-82.03, 50.53], [-81.68, 50.68], [-81.65, 50.75], [-81.75, 51.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -11.504428402925612}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -7.735508339017789}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-2.188074546361065, -3.1425517988393494, -0.8655491073346866]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-8.546174678284615, -9.343357704014409, -7.606353778468645]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-7.319116444728695, -8.806024966155501, -7.081383606169177]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-10.056515626682028, -11.504428402925612, -10.169821122974781]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.780772005394668, -2.073226212539566, -1.6152925111072205]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.2846986981024635, -2.6001420264048423, -2.3093063275488475]}}