{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 09:09:39.202119", "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": "2017-Dec-11_to_2017-Dec-15_276.0_46.5"}, "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": 2017120000413}, "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": "December 11 2017"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 15 2017"}, "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": 97287.34369720219}, "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": 46.5}, "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": 276.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "276.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 273.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 277.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 43.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 48.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2017-12-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-85.03, 48.03], [-84.5, 48.25], [-84.25, 48.15], [-84.0, 48.25], [-83.75, 48.15], [-83.5, 48.25], [-83.25, 48.15], [-83.0, 48.25], [-82.47, 48.03], [-82.32, 47.68], [-81.97, 47.53], [-81.75, 47.0], [-81.85, 46.75], [-81.75, 46.5], [-81.97, 45.97], [-82.37, 45.8], [-82.25, 45.5], [-82.47, 44.97], [-83.0, 44.75], [-83.53, 44.97], [-83.75, 45.5], [-83.62, 45.8], [-83.75, 45.85], [-84.0, 45.75], [-84.53, 45.97], [-84.68, 46.32], [-85.03, 46.47], [-85.25, 47.0], [-85.15, 47.25], [-85.25, 47.5], [-85.03, 48.03]]]]}, "2017-12-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-87.03, 49.03], [-86.5, 49.25], [-86.25, 49.15], [-86.0, 49.25], [-85.75, 49.15], [-85.5, 49.25], [-85.25, 49.15], [-85.0, 49.25], [-84.75, 49.15], [-84.5, 49.25], [-83.97, 49.03], [-83.82, 48.68], [-83.75, 48.65], [-83.5, 48.75], [-82.97, 48.53], [-82.82, 48.18], [-82.47, 48.03], [-82.32, 47.68], [-81.97, 47.53], [-81.75, 47.0], [-81.85, 46.75], [-81.75, 46.5], [-81.97, 45.97], [-82.37, 45.8], [-82.25, 45.5], [-82.35, 45.25], [-82.32, 45.18], [-81.97, 45.03], [-81.75, 44.5], [-81.85, 44.25], [-81.75, 44.0], [-81.97, 43.47], [-82.5, 43.25], [-83.03, 43.47], [-83.18, 43.82], [-83.53, 43.97], [-83.75, 44.5], [-83.65, 44.75], [-83.68, 44.82], [-83.75, 44.85], [-84.0, 44.75], [-84.25, 44.85], [-84.32, 44.82], [-84.47, 44.47], [-85.0, 44.25], [-85.53, 44.47], [-85.75, 45.0], [-85.65, 45.25], [-85.75, 45.5], [-85.65, 45.75], [-85.75, 46.0], [-85.62, 46.3], [-85.75, 46.35], [-86.0, 46.25], [-86.53, 46.47], [-86.68, 46.82], [-87.03, 46.97], [-87.25, 47.5], [-87.04, 48.0], [-87.25, 48.5], [-87.03, 49.03]]]]}, "2017-12-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-87.03, 49.03], [-86.5, 49.25], [-86.25, 49.15], [-86.0, 49.25], [-85.75, 49.15], [-85.5, 49.25], [-85.25, 49.15], [-85.0, 49.25], [-84.75, 49.15], [-84.5, 49.25], [-83.97, 49.03], [-83.82, 48.68], [-83.75, 48.65], [-83.5, 48.75], [-82.97, 48.53], [-82.82, 48.18], [-82.47, 48.03], [-82.32, 47.68], [-81.97, 47.53], [-81.75, 47.0], [-81.85, 46.75], [-81.75, 46.5], [-81.97, 45.97], [-82.37, 45.8], [-82.25, 45.5], [-82.35, 45.25], [-82.32, 45.18], [-81.97, 45.03], [-81.75, 44.5], [-81.85, 44.25], [-81.75, 44.0], [-81.97, 43.47], [-82.5, 43.25], [-83.03, 43.47], [-83.18, 43.82], [-83.53, 43.97], [-83.75, 44.5], [-83.65, 44.75], [-83.68, 44.82], [-83.75, 44.85], [-84.0, 44.75], [-84.25, 44.85], [-84.32, 44.82], [-84.47, 44.47], [-85.0, 44.25], [-85.53, 44.47], [-85.75, 45.0], [-85.65, 45.25], [-85.75, 45.5], [-85.65, 45.75], [-85.75, 46.0], [-85.62, 46.3], [-85.75, 46.35], [-86.0, 46.25], [-86.53, 46.47], [-86.68, 46.82], [-87.03, 46.97], [-87.25, 47.5], [-87.04, 48.0], [-87.25, 48.5], [-87.03, 49.03]]]]}, "2017-12-14T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-87.03, 49.03], [-86.5, 49.25], [-86.25, 49.15], [-86.0, 49.25], [-85.75, 49.15], [-85.5, 49.25], [-85.25, 49.15], [-85.0, 49.25], [-84.75, 49.15], [-84.5, 49.25], [-83.97, 49.03], [-83.82, 48.68], [-83.75, 48.65], [-83.5, 48.75], [-82.97, 48.53], [-82.82, 48.18], [-82.47, 48.03], [-82.32, 47.68], [-81.97, 47.53], [-81.75, 47.0], [-81.85, 46.75], [-81.75, 46.5], [-81.97, 45.97], [-82.37, 45.8], [-82.25, 45.5], [-82.35, 45.25], [-82.32, 45.18], [-81.97, 45.03], [-81.75, 44.5], [-81.85, 44.25], [-81.75, 44.0], [-81.97, 43.47], [-82.5, 43.25], [-83.03, 43.47], [-83.18, 43.82], [-83.53, 43.97], [-83.75, 44.5], [-83.65, 44.75], [-83.68, 44.82], [-83.75, 44.85], [-84.0, 44.75], [-84.25, 44.85], [-84.32, 44.82], [-84.47, 44.47], [-85.0, 44.25], [-85.53, 44.47], [-85.75, 45.0], [-85.65, 45.25], [-85.75, 45.5], [-85.65, 45.75], [-85.75, 46.0], [-85.62, 46.3], [-85.75, 46.35], [-86.0, 46.25], [-86.53, 46.47], [-86.68, 46.82], [-87.03, 46.97], [-87.25, 47.5], [-87.04, 48.0], [-87.25, 48.5], [-87.03, 49.03]]]]}, "2017-12-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-82.5, 44.75], [-81.97, 44.53], [-81.75, 44.0], [-81.97, 43.47], [-82.5, 43.25], [-83.03, 43.47], [-83.25, 44.0], [-83.03, 44.53], [-82.5, 44.75]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -15.728750949141045}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -10.716783925046059}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-18.2955696853804, -13.606326146062429, -16.468529081208146, -15.425567001303648, -4.3298242756378045]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-21.970300137698473, -21.56648288421175, -24.938137378061725, -24.423616125039388, -4.3298242756378045]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-11.481302482101734, -9.272575951001105, -11.969019872491181, -10.79743474572679, -5.134299598545169]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-13.44655277920964, -11.961164558461832, -15.728750949141045, -14.630615378417332, -5.134299598545169]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.8045177133787307, -1.6835813572844118, -2.08242110711382, -1.8522974131950503, -1.4346983743151802]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.0541722592302336, -2.1582317097339314, -2.620581063698062, -2.3392817581483043, -1.4346983743151802]}}