{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 09:03:00.838130", "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": "2015-May-31_to_2015-Jun-07_282.5_43.5"}, "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": 2015050001057}, "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": "May 31 2015"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "June 07 2015"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 8}, "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": 90080.10780851226}, "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"]}, "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": []}, "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": 43.5}, "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": 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": 275.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 284.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 41.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 45.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2015-05-31T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-83.5, 42.75], [-83.25, 42.65], [-83.18, 42.68], [-83.04, 43.0], [-83.2, 43.38], [-83.5, 43.25], [-84.03, 43.47], [-84.25, 44.0], [-84.03, 44.53], [-83.68, 44.68], [-83.65, 44.75], [-83.75, 45.0], [-83.53, 45.53], [-83.0, 45.75], [-82.75, 45.65], [-82.5, 45.75], [-81.97, 45.53], [-81.82, 45.18], [-81.47, 45.03], [-81.25, 44.5], [-81.35, 44.25], [-81.25, 44.0], [-81.35, 43.75], [-81.25, 43.5], [-81.35, 43.25], [-81.32, 43.18], [-81.25, 43.15], [-81.0, 43.25], [-80.75, 43.15], [-80.5, 43.25], [-80.25, 43.15], [-80.18, 43.18], [-80.15, 43.25], [-80.25, 43.5], [-80.03, 44.03], [-79.5, 44.25], [-79.25, 44.15], [-79.0, 44.25], [-78.75, 44.15], [-78.5, 44.25], [-78.25, 44.15], [-78.18, 44.18], [-78.03, 44.53], [-77.5, 44.75], [-77.25, 44.65], [-77.0, 44.75], [-76.75, 44.65], [-76.68, 44.68], [-76.53, 45.03], [-76.0, 45.25], [-75.47, 45.03], [-75.25, 44.5], [-75.47, 43.97], [-75.82, 43.82], [-75.97, 43.47], [-76.32, 43.32], [-76.47, 42.97], [-76.82, 42.82], [-76.97, 42.47], [-77.5, 42.25], [-78.03, 42.47], [-78.18, 42.82], [-78.25, 42.85], [-78.32, 42.82], [-78.47, 42.47], [-78.82, 42.32], [-78.97, 41.97], [-79.5, 41.75], [-79.75, 41.85], [-80.0, 41.75], [-80.25, 41.85], [-80.32, 41.82], [-80.47, 41.47], [-81.0, 41.25], [-81.25, 41.35], [-81.5, 41.25], [-81.75, 41.35], [-82.0, 41.25], [-82.25, 41.35], [-82.5, 41.25], [-82.75, 41.35], [-82.82, 41.32], [-82.97, 40.97], [-83.5, 40.75], [-83.75, 40.85], [-84.0, 40.75], [-84.53, 40.97], [-84.75, 41.5], [-84.53, 42.03], [-84.18, 42.18], [-84.03, 42.53], [-83.5, 42.75]]]]}, "2015-06-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-83.5, 42.75], [-83.25, 42.65], [-83.18, 42.68], [-83.04, 43.0], [-83.2, 43.38], [-83.5, 43.25], [-84.03, 43.47], [-84.25, 44.0], [-84.03, 44.53], [-83.68, 44.68], [-83.65, 44.75], [-83.75, 45.0], [-83.65, 45.25], [-83.75, 45.5], [-83.53, 46.03], [-83.0, 46.25], [-82.47, 46.03], [-82.32, 45.68], [-81.97, 45.53], [-81.82, 45.18], [-81.47, 45.03], [-81.25, 44.5], [-81.35, 44.25], [-81.25, 44.0], [-81.35, 43.75], [-81.25, 43.5], [-81.35, 43.25], [-81.32, 43.18], [-81.25, 43.15], [-81.0, 43.25], [-80.75, 43.15], [-80.5, 43.25], [-80.25, 43.15], [-80.18, 43.18], [-80.15, 43.25], [-80.25, 43.5], [-80.03, 44.03], [-79.5, 44.25], [-79.25, 44.15], [-79.0, 44.25], [-78.75, 44.15], [-78.5, 44.25], [-78.25, 44.15], [-78.18, 44.18], [-78.03, 44.53], [-77.5, 44.75], [-77.25, 44.65], [-77.0, 44.75], [-76.75, 44.65], [-76.68, 44.68], [-76.53, 45.03], [-76.0, 45.25], [-75.47, 45.03], [-75.25, 44.5], [-75.47, 43.97], [-75.82, 43.82], [-75.97, 43.47], [-76.32, 43.32], [-76.47, 42.97], [-76.82, 42.82], [-76.97, 42.47], [-77.5, 42.25], [-78.03, 42.47], [-78.18, 42.82], [-78.25, 42.85], [-78.32, 42.82], [-78.47, 42.47], [-78.82, 42.32], [-78.97, 41.97], [-79.5, 41.75], [-79.75, 41.85], [-80.0, 41.75], [-80.25, 41.85], [-80.32, 41.82], [-80.47, 41.47], [-81.0, 41.25], [-81.25, 41.35], [-81.5, 41.25], [-81.75, 41.35], [-81.82, 41.32], [-81.97, 40.97], [-82.5, 40.75], [-83.0, 40.96], [-83.5, 40.75], [-83.75, 40.85], [-84.0, 40.75], [-84.53, 40.97], [-84.75, 41.5], [-84.53, 42.03], [-84.18, 42.18], [-84.03, 42.53], [-83.5, 42.75]]]]}, "2015-06-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-83.5, 42.75], [-83.25, 42.65], [-83.18, 42.68], [-83.04, 43.0], [-83.2, 43.38], [-83.5, 43.25], [-84.03, 43.47], [-84.25, 44.0], [-84.03, 44.53], [-83.68, 44.68], [-83.65, 44.75], [-83.75, 45.0], [-83.65, 45.25], [-83.75, 45.5], [-83.53, 46.03], [-83.0, 46.25], [-82.47, 46.03], [-82.32, 45.68], [-81.97, 45.53], [-81.82, 45.18], [-81.47, 45.03], [-81.25, 44.5], [-81.35, 44.25], [-81.25, 44.0], [-81.35, 43.75], [-81.25, 43.5], [-81.35, 43.25], [-81.32, 43.18], [-81.25, 43.15], [-81.0, 43.25], [-80.75, 43.15], [-80.5, 43.25], [-80.25, 43.15], [-80.18, 43.18], [-80.15, 43.25], [-80.25, 43.5], [-80.03, 44.03], [-79.5, 44.25], [-79.25, 44.15], [-79.0, 44.25], [-78.75, 44.15], [-78.5, 44.25], [-78.25, 44.15], [-78.18, 44.18], [-78.03, 44.53], [-77.5, 44.75], [-77.25, 44.65], [-77.0, 44.75], [-76.75, 44.65], [-76.68, 44.68], [-76.53, 45.03], [-76.0, 45.25], [-75.47, 45.03], [-75.25, 44.5], [-75.47, 43.97], [-75.82, 43.82], [-75.97, 43.47], [-76.32, 43.32], [-76.47, 42.97], [-76.82, 42.82], [-76.97, 42.47], [-77.5, 42.25], [-78.03, 42.47], [-78.18, 42.82], [-78.25, 42.85], [-78.32, 42.82], [-78.47, 42.47], [-78.82, 42.32], [-78.97, 41.97], [-79.5, 41.75], [-79.75, 41.85], [-80.0, 41.75], [-80.25, 41.85], [-80.32, 41.82], [-80.47, 41.47], [-81.0, 41.25], [-81.25, 41.35], [-81.5, 41.25], [-81.75, 41.35], [-81.82, 41.32], [-81.97, 40.97], [-82.5, 40.75], [-83.0, 40.96], [-83.5, 40.75], [-83.75, 40.85], [-84.0, 40.75], [-84.53, 40.97], [-84.75, 41.5], [-84.53, 42.03], [-84.18, 42.18], [-84.03, 42.53], [-83.5, 42.75]]]]}, "2015-06-03T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-83.53, 42.53], [-83.0, 42.75], [-82.75, 42.65], [-82.5, 42.75], [-82.25, 42.65], [-82.18, 42.68], [-82.03, 43.03], [-81.5, 43.25], [-80.97, 43.03], [-80.82, 42.68], [-80.47, 42.53], [-80.25, 42.0], [-80.47, 41.47], [-81.0, 41.25], [-81.25, 41.35], [-81.5, 41.25], [-81.75, 41.35], [-81.82, 41.32], [-81.97, 40.97], [-82.5, 40.75], [-83.03, 40.97], [-83.18, 41.32], [-83.53, 41.47], [-83.75, 42.0], [-83.53, 42.53]]], [[[-80.03, 44.03], [-79.5, 44.25], [-79.25, 44.15], [-79.0, 44.25], [-78.75, 44.15], [-78.5, 44.25], [-78.25, 44.15], [-78.0, 44.25], [-77.75, 44.15], [-77.5, 44.25], [-77.25, 44.15], [-77.0, 44.25], [-76.47, 44.03], [-76.25, 43.5], [-76.47, 42.97], [-77.0, 42.75], [-77.25, 42.85], [-77.5, 42.75], [-77.75, 42.85], [-78.0, 42.75], [-78.25, 42.85], [-78.5, 42.75], [-78.75, 42.85], [-79.0, 42.75], [-79.25, 42.85], [-79.5, 42.75], [-80.03, 42.97], [-80.25, 43.5], [-80.03, 44.03]]], [[[-83.75, 45.5], [-83.53, 46.03], [-83.0, 46.25], [-82.47, 46.03], [-82.25, 45.5], [-82.47, 44.97], [-83.0, 44.75], [-83.53, 44.97], [-83.75, 45.5]]]]}, "2015-06-04T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-80.03, 42.97], [-80.25, 43.5], [-80.03, 44.03], [-79.5, 44.25], [-79.25, 44.15], [-79.0, 44.25], [-78.5, 44.04], [-78.0, 44.25], [-77.75, 44.15], [-77.5, 44.25], [-76.97, 44.03], [-76.75, 43.5], [-76.97, 42.97], [-77.5, 42.75], [-77.75, 42.85], [-78.0, 42.75], [-78.5, 42.96], [-79.0, 42.75], [-79.25, 42.85], [-79.5, 42.75], [-80.03, 42.97]]]]}, "2015-06-05T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-77.5, 44.25], [-76.97, 44.03], [-76.75, 43.5], [-76.97, 42.97], [-77.5, 42.75], [-78.03, 42.97], [-78.25, 43.5], [-78.03, 44.03], [-77.5, 44.25]]]]}, "2015-06-06T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-77.5, 44.25], [-76.97, 44.03], [-76.75, 43.5], [-76.97, 42.97], [-77.5, 42.75], [-78.03, 42.97], [-78.25, 43.5], [-78.03, 44.03], [-77.5, 44.25]]]]}, "2015-06-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-77.5, 44.25], [-76.97, 44.03], [-76.75, 43.5], [-76.97, 42.97], [-77.5, 42.75], [-78.03, 42.97], [-78.25, 43.5], [-78.03, 44.03], [-77.5, 44.25]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -8.524021759618961}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.073945093836291}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [9.906678935923878, 8.8397017684498, 10.213502845183825, 10.96067897726175, 9.737279869015481, 8.490993529454727, 8.280355830560211, 9.023168639265919]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [5.7180433520680936, 5.140642272586888, 5.430129587002625, 5.820869693846646, 8.228772715047512, 8.490993529454727, 8.280355830560211, 9.023168639265919]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.017938703238099, -6.063572280077797, -4.744532431421353, -4.1141172109620765, -3.2074759633615457, -3.7646901491454514, -4.266416977755739, -3.813856926413905]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-7.929416667214525, -8.524021759618961, -6.907320259907635, -5.307374604101369, -3.7836890514540755, -3.7646901491454514, -4.266416977755739, -3.813856926413905]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.530489198607237, -1.9229397047551704, -1.6175428861181693, -1.475894708936091, -1.3776590492091536, -1.5468203348175202, -1.7622557790862756, -1.569083729651995]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.07805126498501, -2.3906298556879455, -2.094980728268392, -1.8042059626891978, -1.5405758277821915, -1.5468203348175202, -1.7622557790862756, -1.569083729651995]}}