{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:27:14.904329", "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": "2021-Sep-15_to_2021-Sep-18_239.0_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": 2021090000470}, "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": "September 15 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 18 2021"}, "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": 56461.303652051945}, "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": ["N.Central-America", "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": ["North Pacific 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": 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": 239.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "239.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 238.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 241.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 32.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 35.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-09-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-122.25, 35.5], [-122.03, 36.03], [-121.5, 36.25], [-121.25, 36.15], [-121.0, 36.25], [-120.47, 36.03], [-120.32, 35.68], [-119.97, 35.53], [-119.75, 35.0], [-119.85, 34.75], [-119.82, 34.68], [-119.75, 34.65], [-119.5, 34.75], [-118.97, 34.53], [-118.75, 34.0], [-118.97, 33.47], [-119.32, 33.32], [-119.35, 33.25], [-119.25, 33.0], [-119.35, 32.75], [-119.25, 32.5], [-119.47, 31.97], [-120.0, 31.75], [-120.25, 31.85], [-120.5, 31.75], [-121.03, 31.97], [-121.18, 32.32], [-121.53, 32.47], [-121.75, 33.0], [-121.65, 33.25], [-121.75, 33.5], [-121.65, 33.75], [-121.75, 34.0], [-121.65, 34.25], [-121.75, 34.5], [-121.65, 34.75], [-121.68, 34.82], [-122.03, 34.97], [-122.25, 35.5]]]]}, "2021-09-16T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-122.25, 35.5], [-122.03, 36.03], [-121.5, 36.25], [-121.25, 36.15], [-121.0, 36.25], [-120.47, 36.03], [-120.32, 35.68], [-119.97, 35.53], [-119.82, 35.18], [-119.47, 35.03], [-119.32, 34.68], [-119.25, 34.65], [-119.0, 34.75], [-118.47, 34.53], [-118.25, 34.0], [-118.46, 33.5], [-118.25, 33.0], [-118.47, 32.47], [-119.0, 32.25], [-119.25, 32.35], [-119.32, 32.32], [-119.47, 31.97], [-120.0, 31.75], [-120.25, 31.85], [-120.5, 31.75], [-121.03, 31.97], [-121.18, 32.32], [-121.53, 32.47], [-121.75, 33.0], [-121.65, 33.25], [-121.75, 33.5], [-121.65, 33.75], [-121.75, 34.0], [-121.65, 34.25], [-121.75, 34.5], [-121.65, 34.75], [-121.68, 34.82], [-122.03, 34.97], [-122.25, 35.5]]]]}, "2021-09-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-122.25, 35.5], [-122.03, 36.03], [-121.5, 36.25], [-121.25, 36.15], [-121.0, 36.25], [-120.47, 36.03], [-120.32, 35.68], [-119.97, 35.53], [-119.82, 35.18], [-119.47, 35.03], [-119.32, 34.68], [-119.25, 34.65], [-119.0, 34.75], [-118.47, 34.53], [-118.25, 34.0], [-118.46, 33.5], [-118.25, 33.0], [-118.47, 32.47], [-119.0, 32.25], [-119.25, 32.35], [-119.32, 32.32], [-119.47, 31.97], [-120.0, 31.75], [-120.25, 31.85], [-120.5, 31.75], [-121.03, 31.97], [-121.18, 32.32], [-121.53, 32.47], [-121.75, 33.0], [-121.65, 33.25], [-121.75, 33.5], [-121.65, 33.75], [-121.75, 34.0], [-121.65, 34.25], [-121.75, 34.5], [-121.65, 34.75], [-121.68, 34.82], [-122.03, 34.97], [-122.25, 35.5]]]]}, "2021-09-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-122.03, 34.97], [-122.25, 35.5], [-122.03, 36.03], [-121.5, 36.25], [-121.25, 36.15], [-121.0, 36.25], [-120.47, 36.03], [-120.32, 35.68], [-119.97, 35.53], [-119.82, 35.18], [-119.47, 35.03], [-119.32, 34.68], [-119.25, 34.65], [-119.0, 34.75], [-118.47, 34.53], [-118.25, 34.0], [-118.46, 33.5], [-118.25, 33.0], [-118.47, 32.47], [-119.0, 32.25], [-119.25, 32.35], [-119.5, 32.25], [-120.03, 32.47], [-120.25, 33.0], [-120.04, 33.5], [-120.18, 33.82], [-120.25, 33.85], [-120.5, 33.75], [-121.03, 33.97], [-121.25, 34.5], [-121.15, 34.75], [-121.18, 34.82], [-121.25, 34.85], [-121.5, 34.75], [-122.03, 34.97]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -3.7149514256452676}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -1.9903017244879213}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [15.155529281706379, 15.050925208544356, 15.24990395688343, 15.695588510438483]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [13.484103926419891, 13.470657927817854, 13.575489812266994, 14.55149732706758]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-1.7783052051276576, -2.1402245282883117, -1.9484067048728817, -2.150226846310924]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-2.683747633053997, -3.7149514256452676, -3.376784506496392, -3.2690223099981495]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3161664465324519, -1.5590633299373986, -1.3997007678066278, -1.3444605869884936]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.594925374750958, -2.0115375133664943, -1.9597329782129802, -1.6785201063597794]}}