{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:10:17.269980", "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": "2026-Feb-19_to_2026-Feb-22_253.0_37.0"}, "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": 2026020000478}, "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 19 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "February 22 2026"}, "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": 62783.960238626074}, "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"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["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": 37.0}, "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": 253.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "253.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 251.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 254.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 36.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 40.75}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-105.5, 37.75], [-104.97, 37.53], [-104.75, 37.0], [-104.97, 36.47], [-105.5, 36.25], [-105.75, 36.35], [-106.0, 36.25], [-106.25, 36.35], [-106.5, 36.25], [-106.75, 36.35], [-107.0, 36.25], [-107.53, 36.47], [-107.68, 36.82], [-107.75, 36.85], [-108.0, 36.75], [-108.53, 36.97], [-108.75, 37.5], [-108.53, 38.03], [-108.18, 38.18], [-108.15, 38.25], [-108.25, 38.5], [-108.15, 38.75], [-108.18, 38.82], [-108.53, 38.97], [-108.75, 39.5], [-108.53, 40.03], [-108.18, 40.18], [-108.03, 40.53], [-107.5, 40.75], [-107.25, 40.65], [-107.0, 40.75], [-106.75, 40.65], [-106.68, 40.68], [-106.53, 41.03], [-106.0, 41.25], [-105.47, 41.03], [-105.25, 40.5], [-105.35, 40.25], [-105.25, 40.0], [-105.35, 39.75], [-105.25, 39.5], [-105.47, 38.97], [-105.82, 38.82], [-105.85, 38.75], [-105.75, 38.5], [-105.85, 38.25], [-105.75, 38.0], [-105.85, 37.75], [-105.82, 37.68], [-105.75, 37.65], [-105.5, 37.75]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.North-America", "C.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-02-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-108.15, 38.25], [-108.25, 38.5], [-108.15, 38.75], [-108.18, 38.82], [-108.53, 38.97], [-108.75, 39.5], [-108.53, 40.03], [-108.18, 40.18], [-108.03, 40.53], [-107.5, 40.75], [-107.25, 40.65], [-107.0, 40.75], [-106.75, 40.65], [-106.68, 40.68], [-106.53, 41.03], [-106.0, 41.25], [-105.47, 41.03], [-105.25, 40.5], [-105.35, 40.25], [-105.25, 40.0], [-105.35, 39.75], [-105.25, 39.5], [-105.47, 38.97], [-105.82, 38.82], [-105.85, 38.75], [-105.75, 38.5], [-105.85, 38.25], [-105.75, 38.0], [-105.85, 37.75], [-105.82, 37.68], [-105.75, 37.65], [-105.5, 37.75], [-104.97, 37.53], [-104.75, 37.0], [-104.97, 36.47], [-105.5, 36.25], [-105.75, 36.35], [-106.0, 36.25], [-106.25, 36.35], [-106.5, 36.25], [-106.75, 36.35], [-107.0, 36.25], [-107.53, 36.47], [-107.68, 36.82], [-107.75, 36.85], [-108.0, 36.75], [-108.53, 36.97], [-108.75, 37.5], [-108.53, 38.03], [-108.18, 38.18], [-108.15, 38.25]]]]}, "2026-02-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-108.15, 38.25], [-108.25, 38.5], [-108.15, 38.75], [-108.18, 38.82], [-108.53, 38.97], [-108.75, 39.5], [-108.53, 40.03], [-108.18, 40.18], [-108.03, 40.53], [-107.5, 40.75], [-107.25, 40.65], [-107.0, 40.75], [-106.75, 40.65], [-106.68, 40.68], [-106.53, 41.03], [-106.0, 41.25], [-105.47, 41.03], [-105.25, 40.5], [-105.35, 40.25], [-105.25, 40.0], [-105.35, 39.75], [-105.25, 39.5], [-105.47, 38.97], [-105.82, 38.82], [-105.85, 38.75], [-105.75, 38.5], [-105.85, 38.25], [-105.75, 38.0], [-105.85, 37.75], [-105.82, 37.68], [-105.75, 37.65], [-105.5, 37.75], [-104.97, 37.53], [-104.75, 37.0], [-104.97, 36.47], [-105.5, 36.25], [-105.75, 36.35], [-106.0, 36.25], [-106.25, 36.35], [-106.5, 36.25], [-106.75, 36.35], [-107.0, 36.25], [-107.53, 36.47], [-107.68, 36.82], [-107.75, 36.85], [-108.0, 36.75], [-108.53, 36.97], [-108.75, 37.5], [-108.53, 38.03], [-108.18, 38.18], [-108.15, 38.25]]]]}, "2026-02-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-108.15, 38.25], [-108.25, 38.5], [-108.15, 38.75], [-108.18, 38.82], [-108.53, 38.97], [-108.75, 39.5], [-108.53, 40.03], [-108.18, 40.18], [-108.03, 40.53], [-107.5, 40.75], [-107.25, 40.65], [-107.0, 40.75], [-106.75, 40.65], [-106.68, 40.68], [-106.53, 41.03], [-106.0, 41.25], [-105.47, 41.03], [-105.25, 40.5], [-105.35, 40.25], [-105.25, 40.0], [-105.35, 39.75], [-105.25, 39.5], [-105.47, 38.97], [-105.82, 38.82], [-105.85, 38.75], [-105.75, 38.5], [-105.85, 38.25], [-105.75, 38.0], [-105.85, 37.75], [-105.82, 37.68], [-105.75, 37.65], [-105.5, 37.75], [-104.97, 37.53], [-104.75, 37.0], [-104.97, 36.47], [-105.5, 36.25], [-105.75, 36.35], [-106.0, 36.25], [-106.25, 36.35], [-106.5, 36.25], [-106.75, 36.35], [-107.0, 36.25], [-107.53, 36.47], [-107.68, 36.82], [-107.75, 36.85], [-108.0, 36.75], [-108.53, 36.97], [-108.75, 37.5], [-108.53, 38.03], [-108.18, 38.18], [-108.15, 38.25]]]]}, "2026-02-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-107.53, 36.47], [-107.75, 37.0], [-107.53, 37.53], [-107.0, 37.75], [-106.75, 37.65], [-106.5, 37.75], [-106.25, 37.65], [-106.0, 37.75], [-105.47, 37.53], [-105.25, 37.0], [-105.47, 36.47], [-106.0, 36.25], [-106.25, 36.35], [-106.5, 36.25], [-106.75, 36.35], [-107.0, 36.25], [-107.53, 36.47]]], [[[-108.53, 38.97], [-108.75, 39.5], [-108.53, 40.03], [-108.0, 40.25], [-107.75, 40.15], [-107.5, 40.25], [-106.97, 40.03], [-106.75, 39.5], [-106.97, 38.97], [-107.5, 38.75], [-107.75, 38.85], [-108.0, 38.75], [-108.53, 38.97]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -9.709802965914974}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.960052974719467}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-11.351720262185097, -12.431524878281778, -11.90433161319828, -9.055469258626317]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-14.587496821085608, -18.09397989908851, -15.336496734619118, -10.346712493896462]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.466140335512626, -6.567953576681875, -5.922831912650423, -5.560865091149537]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-8.481392503647328, -9.709802965914974, -8.596592709113793, -6.599615022131786]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5465235940792115, -1.7993141168810785, -1.6399851393098053, -1.6004373457726822]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.523772402516735, -2.5146504813862114, -2.521358949388288, -1.9152076988163156]}}