{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 09:02:48.070452", "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-Apr-28_to_2015-May-03_294.0_42.0"}, "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": 2015040001052}, "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 28 2015"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 03 2015"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 6}, "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": 92196.64975317044}, "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": ["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": ["North Atlantic Ocean"]}, "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": 42.0}, "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": 294.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "294.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 290.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 295.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 39.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 43.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2015-04-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-66.53, 41.47], [-66.75, 42.0], [-66.53, 42.53], [-66.0, 42.75], [-65.75, 42.65], [-65.5, 42.75], [-64.97, 42.53], [-64.75, 42.0], [-64.97, 41.47], [-65.5, 41.25], [-65.75, 41.35], [-66.0, 41.25], [-66.53, 41.47]]]]}, "2015-04-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-66.53, 41.47], [-66.75, 42.0], [-66.53, 42.53], [-66.0, 42.75], [-65.75, 42.65], [-65.5, 42.75], [-64.97, 42.53], [-64.82, 42.18], [-64.47, 42.03], [-64.25, 41.5], [-64.47, 40.97], [-65.0, 40.75], [-65.53, 40.97], [-65.68, 41.32], [-65.75, 41.35], [-66.0, 41.25], [-66.53, 41.47]]]]}, "2015-04-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-68.03, 39.97], [-68.25, 40.5], [-68.03, 41.03], [-67.5, 41.25], [-66.97, 41.03], [-66.75, 40.5], [-66.97, 39.97], [-67.5, 39.75], [-68.03, 39.97]]], [[[-66.75, 42.0], [-66.53, 42.53], [-66.0, 42.75], [-65.75, 42.65], [-65.5, 42.75], [-64.97, 42.53], [-64.82, 42.18], [-64.47, 42.03], [-64.25, 41.5], [-64.47, 40.97], [-65.0, 40.75], [-65.53, 40.97], [-65.68, 41.32], [-65.75, 41.35], [-66.0, 41.25], [-66.53, 41.47], [-66.75, 42.0]]]]}, "2015-05-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-70.15, 41.75], [-70.25, 42.0], [-70.03, 42.53], [-69.5, 42.75], [-69.0, 42.54], [-68.68, 42.68], [-68.53, 43.03], [-68.18, 43.18], [-68.03, 43.53], [-67.5, 43.75], [-67.25, 43.65], [-67.18, 43.68], [-67.03, 44.03], [-66.5, 44.25], [-66.25, 44.15], [-66.0, 44.25], [-65.75, 44.15], [-65.5, 44.25], [-64.97, 44.03], [-64.75, 43.5], [-64.97, 42.97], [-65.32, 42.82], [-65.35, 42.75], [-65.32, 42.68], [-64.97, 42.53], [-64.82, 42.18], [-64.47, 42.03], [-64.25, 41.5], [-64.47, 40.97], [-65.0, 40.75], [-65.53, 40.97], [-65.68, 41.32], [-65.75, 41.35], [-65.82, 41.32], [-65.97, 40.97], [-66.32, 40.82], [-66.47, 40.47], [-66.82, 40.32], [-66.97, 39.97], [-67.5, 39.75], [-67.75, 39.85], [-68.0, 39.75], [-68.25, 39.85], [-68.32, 39.82], [-68.47, 39.47], [-69.0, 39.25], [-69.25, 39.35], [-69.5, 39.25], [-70.03, 39.47], [-70.25, 40.0], [-70.04, 40.5], [-70.25, 41.0], [-70.15, 41.25], [-70.25, 41.5], [-70.15, 41.75]]]]}, "2015-05-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-70.15, 41.75], [-70.25, 42.0], [-70.03, 42.53], [-69.5, 42.75], [-69.0, 42.54], [-68.68, 42.68], [-68.53, 43.03], [-68.18, 43.18], [-68.03, 43.53], [-67.5, 43.75], [-67.25, 43.65], [-67.18, 43.68], [-67.03, 44.03], [-66.5, 44.25], [-66.25, 44.15], [-66.0, 44.25], [-65.75, 44.15], [-65.5, 44.25], [-64.97, 44.03], [-64.75, 43.5], [-64.97, 42.97], [-65.32, 42.82], [-65.35, 42.75], [-65.32, 42.68], [-64.97, 42.53], [-64.75, 42.0], [-64.97, 41.47], [-65.5, 41.25], [-65.75, 41.35], [-65.82, 41.32], [-65.97, 40.97], [-66.32, 40.82], [-66.47, 40.47], [-66.82, 40.32], [-66.97, 39.97], [-67.5, 39.75], [-67.75, 39.85], [-68.0, 39.75], [-68.25, 39.85], [-68.32, 39.82], [-68.47, 39.47], [-69.0, 39.25], [-69.25, 39.35], [-69.5, 39.25], [-70.03, 39.47], [-70.25, 40.0], [-70.04, 40.5], [-70.25, 41.0], [-70.15, 41.25], [-70.25, 41.5], [-70.15, 41.75]]]]}, 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entire duration", "value": -3.6677689889472163}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.408794206715698}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [3.872526688080825, 4.353931615045894, 5.2006095733419215, 5.084535778155043, 5.356499428249322, 5.76757922684817]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [3.8418993478867947, 3.885708074999627, 4.070635179715509, 3.603127075910322, 3.497580707243401, 3.362995126033468]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.712191222742973, -2.9474553043894693, -2.743381025698639, -2.5405769113169185, -2.383520924865326, -2.202300133218542]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily 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