{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 08:47:13.727968", "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": "2011-Apr-30_to_2011-May-02_257.0_47.5"}, "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": 2011040001544}, "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 30 2011"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 02 2011"}, "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": 61228.12084765178}, "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": ["C.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": []}, "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": 47.5}, "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": 257.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "257.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 255.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 260.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 46.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 51.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2011-04-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-104.75, 47.5], [-104.53, 48.03], [-104.18, 48.18], [-104.15, 48.25], [-104.25, 48.5], [-104.15, 48.75], [-104.25, 49.0], [-104.03, 49.53], [-103.5, 49.75], [-103.25, 49.65], [-103.0, 49.75], [-102.75, 49.65], [-102.62, 49.7], [-102.75, 50.0], [-102.53, 50.53], [-102.0, 50.75], [-101.75, 50.65], [-101.62, 50.7], [-101.75, 51.0], [-101.53, 51.53], [-101.0, 51.75], [-100.75, 51.65], [-100.5, 51.75], [-99.97, 51.53], [-99.82, 51.18], [-99.47, 51.03], [-99.25, 50.5], [-99.47, 49.97], [-99.82, 49.82], [-99.97, 49.47], [-100.32, 49.32], [-100.47, 48.97], [-100.82, 48.82], [-100.97, 48.47], [-101.32, 48.32], [-101.47, 47.97], [-101.82, 47.82], [-101.85, 47.75], [-101.75, 47.5], [-101.85, 47.25], [-101.75, 47.0], [-101.97, 46.47], [-102.32, 46.32], [-102.47, 45.97], [-103.0, 45.75], [-103.25, 45.85], [-103.5, 45.75], [-104.03, 45.97], [-104.25, 46.5], [-104.15, 46.75], [-104.18, 46.82], [-104.53, 46.97], [-104.75, 47.5]]]]}, "2011-05-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-104.75, 47.5], [-104.53, 48.03], [-104.18, 48.18], [-104.15, 48.25], [-104.25, 48.5], [-104.15, 48.75], [-104.25, 49.0], [-104.03, 49.53], [-103.5, 49.75], [-103.25, 49.65], [-103.0, 49.75], [-102.75, 49.65], [-102.62, 49.7], [-102.75, 50.0], [-102.53, 50.53], [-102.0, 50.75], [-101.75, 50.65], [-101.62, 50.7], [-101.75, 51.0], [-101.53, 51.53], [-101.0, 51.75], [-100.75, 51.65], [-100.5, 51.75], [-99.97, 51.53], [-99.82, 51.18], [-99.47, 51.03], [-99.25, 50.5], [-99.47, 49.97], [-99.82, 49.82], [-99.97, 49.47], [-100.32, 49.32], [-100.47, 48.97], [-100.82, 48.82], [-100.97, 48.47], [-101.32, 48.32], [-101.47, 47.97], [-101.82, 47.82], [-101.85, 47.75], [-101.75, 47.5], [-101.85, 47.25], [-101.75, 47.0], [-101.97, 46.47], [-102.32, 46.32], [-102.47, 45.97], [-103.0, 45.75], [-103.25, 45.85], [-103.5, 45.75], [-104.03, 45.97], [-104.25, 46.5], [-104.15, 46.75], [-104.18, 46.82], [-104.53, 46.97], [-104.75, 47.5]]]]}, "2011-05-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-104.75, 47.5], [-104.53, 48.03], [-104.18, 48.18], [-104.15, 48.25], [-104.25, 48.5], [-104.15, 48.75], [-104.25, 49.0], [-104.03, 49.53], [-103.5, 49.75], [-103.25, 49.65], [-103.0, 49.75], [-102.75, 49.65], [-102.62, 49.7], [-102.75, 50.0], [-102.53, 50.53], [-102.0, 50.75], [-101.75, 50.65], [-101.62, 50.7], [-101.75, 51.0], [-101.53, 51.53], [-101.0, 51.75], [-100.75, 51.65], [-100.5, 51.75], [-99.97, 51.53], [-99.82, 51.18], [-99.47, 51.03], [-99.25, 50.5], [-99.47, 49.97], [-99.82, 49.82], [-99.97, 49.47], [-100.32, 49.32], [-100.47, 48.97], [-100.82, 48.82], [-100.97, 48.47], [-101.32, 48.32], [-101.47, 47.97], [-101.82, 47.82], [-101.85, 47.75], [-101.75, 47.5], [-101.85, 47.25], [-101.75, 47.0], [-101.97, 46.47], [-102.32, 46.32], [-102.47, 45.97], [-103.0, 45.75], [-103.25, 45.85], [-103.5, 45.75], [-104.03, 45.97], [-104.25, 46.5], [-104.15, 46.75], [-104.18, 46.82], [-104.53, 46.97], [-104.75, 47.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -11.447349504703993}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -8.290566028125}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-0.45826067876771504, -0.8820160215779538, 0.46952970546084316]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-3.032800068078984, -5.494213780640337, -1.378046723034572]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-8.091437207089077, -8.916872759162095, -7.863388118123832]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-9.06434211468985, -11.447349504703993, -9.996976854709601]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.7056507842200879, -1.874245387253729, -1.6793444108789208]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.8476077595663984, -2.3204565238848542, -2.148596185058031]}}