{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 08:46:46.703697", "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-Feb-20_to_2011-Feb-23_246.5_35.5"}, "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": 2011020001016}, "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": "February 20 2011"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "February 23 2011"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 4}, "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": 75407.04233129264}, "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": ["United States"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.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": 35.5}, "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": 246.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "246.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 244.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 248.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 33.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 37.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2011-02-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-114.68, 35.68], [-114.65, 35.75], [-114.75, 36.0], [-114.65, 36.25], [-114.75, 36.5], [-114.53, 37.03], [-114.0, 37.25], [-113.47, 37.03], [-113.32, 36.68], [-112.97, 36.53], [-112.75, 36.0], [-112.85, 35.75], [-112.75, 35.5], [-112.85, 35.25], [-112.82, 35.18], [-112.75, 35.15], [-112.5, 35.25], [-111.97, 35.03], [-111.75, 34.5], [-111.97, 33.97], [-112.32, 33.82], [-112.47, 33.47], [-113.0, 33.25], [-113.25, 33.35], [-113.5, 33.25], [-114.03, 33.47], [-114.25, 34.0], [-114.15, 34.25], [-114.18, 34.32], [-114.25, 34.35], [-114.32, 34.32], [-114.47, 33.97], [-115.0, 33.75], [-115.53, 33.97], [-115.75, 34.5], [-115.53, 35.03], [-115.18, 35.18], [-115.03, 35.53], [-114.68, 35.68]]]]}, "2011-02-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-114.68, 35.68], [-114.65, 35.75], [-114.75, 36.0], [-114.65, 36.25], [-114.75, 36.5], [-114.53, 37.03], [-114.0, 37.25], [-113.75, 37.15], [-113.68, 37.18], [-113.53, 37.53], [-113.0, 37.75], [-112.75, 37.65], [-112.68, 37.68], [-112.53, 38.03], [-112.0, 38.25], [-111.47, 38.03], [-111.25, 37.5], [-111.46, 37.0], [-111.25, 36.5], [-111.35, 36.25], [-111.25, 36.0], [-111.35, 35.75], [-111.32, 35.68], [-110.97, 35.53], [-110.75, 35.0], [-110.97, 34.47], [-111.5, 34.25], [-111.8, 34.38], [-111.97, 33.97], [-112.32, 33.82], [-112.47, 33.47], [-113.0, 33.25], [-113.25, 33.35], [-113.5, 33.25], [-114.03, 33.47], [-114.25, 34.0], [-114.15, 34.25], [-114.18, 34.32], [-114.25, 34.35], [-114.32, 34.32], [-114.47, 33.97], [-115.0, 33.75], [-115.53, 33.97], [-115.75, 34.5], [-115.53, 35.03], [-115.18, 35.18], [-115.03, 35.53], [-114.68, 35.68]]]]}, "2011-02-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-114.68, 35.68], [-114.65, 35.75], [-114.75, 36.0], [-114.65, 36.25], [-114.75, 36.5], [-114.53, 37.03], [-114.0, 37.25], [-113.75, 37.15], [-113.68, 37.18], [-113.53, 37.53], [-113.0, 37.75], [-112.75, 37.65], [-112.68, 37.68], [-112.53, 38.03], [-112.0, 38.25], [-111.47, 38.03], [-111.25, 37.5], [-111.46, 37.0], [-111.25, 36.5], [-111.35, 36.25], [-111.25, 36.0], [-111.35, 35.75], [-111.32, 35.68], [-110.97, 35.53], [-110.75, 35.0], [-110.97, 34.47], [-111.5, 34.25], [-111.8, 34.38], [-111.97, 33.97], [-112.32, 33.82], [-112.47, 33.47], [-113.0, 33.25], [-113.25, 33.35], [-113.5, 33.25], [-114.03, 33.47], [-114.25, 34.0], [-114.15, 34.25], [-114.18, 34.32], [-114.25, 34.35], [-114.32, 34.32], [-114.47, 33.97], [-115.0, 33.75], [-115.53, 33.97], [-115.75, 34.5], [-115.53, 35.03], [-115.18, 35.18], [-115.03, 35.53], [-114.68, 35.68]]]]}, "2011-02-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-114.04, 36.0], [-114.25, 36.5], [-114.03, 37.03], [-113.68, 37.18], [-113.53, 37.53], [-113.0, 37.75], [-112.75, 37.65], [-112.68, 37.68], [-112.53, 38.03], [-112.0, 38.25], [-111.47, 38.03], [-111.25, 37.5], [-111.46, 37.0], [-111.25, 36.5], [-111.35, 36.25], [-111.25, 36.0], [-111.35, 35.75], [-111.32, 35.68], [-110.97, 35.53], [-110.75, 35.0], [-110.97, 34.47], [-111.5, 34.25], [-112.0, 34.46], [-112.32, 34.32], [-112.47, 33.97], [-113.0, 33.75], [-113.53, 33.97], [-113.68, 34.32], [-114.03, 34.47], [-114.25, 35.0], [-114.15, 35.25], [-114.25, 35.5], [-114.04, 36.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -11.116015256414983}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -6.978628617660277}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [4.766577767348906, -1.5829056843260787, -1.07584877721996, -3.531152624004733]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [0.8778687006990822, -11.55729945704951, -7.427706627959708, -8.942993940227268]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.134469965711214, -7.745635169436946, -7.037405543650501, -7.033613712096068]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.235950450319876, -11.116015256414983, -10.199637090103238, -9.783205695040351]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4818995435504068, -2.0478595185750317, -1.8631642363986167, -1.8196951771878]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.7582571944171828, -2.694084763027536, -2.665468886210998, -2.3668643952486756]}}