{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:51:42.557251", "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": "2023-Mar-11_to_2023-Mar-14_223.5_57.0"}, "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": 2023030000402}, "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": "March 11 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "March 14 2023"}, "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": 77420.3774677489}, "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": ["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": 57.0}, "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": 223.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "223.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 220.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 226.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 55.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 57.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-139.0, 57.75], [-138.75, 57.65], [-138.68, 57.68], [-138.53, 58.03], [-138.0, 58.25], [-137.75, 58.15], [-137.5, 58.25], [-136.97, 58.03], [-136.82, 57.68], [-136.75, 57.65], [-136.5, 57.75], [-136.25, 57.65], [-136.0, 57.75], [-135.47, 57.53], [-135.32, 57.18], [-135.25, 57.15], [-135.0, 57.25], [-134.47, 57.03], [-134.32, 56.68], [-134.25, 56.65], [-134.0, 56.75], [-133.47, 56.53], [-133.32, 56.18], [-132.97, 56.03], [-132.75, 55.5], [-132.97, 54.97], [-133.5, 54.75], [-133.75, 54.85], [-134.0, 54.75], [-134.25, 54.85], [-134.5, 54.75], [-134.75, 54.85], [-135.0, 54.75], [-135.25, 54.85], [-135.5, 54.75], [-135.75, 54.85], [-136.0, 54.75], [-136.25, 54.85], [-136.5, 54.75], [-136.75, 54.85], [-137.0, 54.75], [-137.25, 54.85], [-137.5, 54.75], [-137.75, 54.85], [-138.0, 54.75], [-138.25, 54.85], [-138.32, 54.82], [-138.47, 54.47], [-139.0, 54.25], [-139.53, 54.47], [-139.75, 55.0], [-139.65, 55.25], [-139.68, 55.32], [-139.75, 55.35], [-140.0, 55.25], [-140.53, 55.47], [-140.75, 56.0], [-140.53, 56.53], [-140.18, 56.68], [-140.03, 57.03], [-139.68, 57.18], [-139.53, 57.53], [-139.0, 57.75]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.W.North-America", "N.Pacific-Ocean"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2023-03-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-137.0, 56.25], [-137.53, 56.47], [-137.75, 57.0], [-137.53, 57.53], [-137.0, 57.75], [-136.75, 57.65], [-136.5, 57.75], [-136.25, 57.65], [-136.0, 57.75], [-135.47, 57.53], [-135.25, 57.0], [-135.47, 56.47], [-136.0, 56.25], [-136.25, 56.35], [-136.5, 56.25], [-136.75, 56.35], [-137.0, 56.25]]]]}, "2023-03-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-140.03, 57.03], [-139.68, 57.18], [-139.53, 57.53], [-139.0, 57.75], [-138.75, 57.65], [-138.68, 57.68], [-138.53, 58.03], [-138.0, 58.25], [-137.75, 58.15], [-137.5, 58.25], [-136.97, 58.03], [-136.82, 57.68], [-136.75, 57.65], [-136.5, 57.75], [-136.25, 57.65], [-136.0, 57.75], [-135.47, 57.53], [-135.32, 57.18], [-135.25, 57.15], [-135.0, 57.25], [-134.47, 57.03], [-134.32, 56.68], [-134.25, 56.65], [-134.0, 56.75], [-133.47, 56.53], [-133.32, 56.18], [-132.97, 56.03], [-132.75, 55.5], [-132.97, 54.97], [-133.5, 54.75], [-133.75, 54.85], [-134.0, 54.75], [-134.25, 54.85], [-134.5, 54.75], [-134.75, 54.85], [-135.0, 54.75], [-135.25, 54.85], [-135.5, 54.75], [-135.75, 54.85], [-136.0, 54.75], [-136.25, 54.85], [-136.5, 54.75], [-136.75, 54.85], [-137.0, 54.75], [-137.25, 54.85], [-137.5, 54.75], [-137.75, 54.85], [-138.0, 54.75], [-138.25, 54.85], [-138.32, 54.82], [-138.47, 54.47], [-139.0, 54.25], [-139.53, 54.47], [-139.75, 55.0], [-139.65, 55.25], [-139.68, 55.32], [-139.75, 55.35], [-140.0, 55.25], [-140.53, 55.47], [-140.75, 56.0], [-140.53, 56.53], [-140.18, 56.68], [-140.03, 57.03]]]]}, "2023-03-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-140.03, 57.03], [-139.68, 57.18], [-139.53, 57.53], [-139.0, 57.75], 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56.53], [-140.18, 56.68], [-140.03, 57.03]]]]}, "2023-03-14T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-140.03, 57.03], [-139.68, 57.18], [-139.53, 57.53], [-139.0, 57.75], [-138.75, 57.65], [-138.68, 57.68], [-138.53, 58.03], [-138.0, 58.25], [-137.75, 58.15], [-137.5, 58.25], [-136.97, 58.03], [-136.82, 57.68], [-136.75, 57.65], [-136.5, 57.75], [-135.97, 57.53], [-135.82, 57.18], [-135.75, 57.15], [-135.5, 57.25], [-135.25, 57.15], [-135.0, 57.25], [-134.47, 57.03], [-134.32, 56.68], [-134.25, 56.65], [-134.0, 56.75], [-133.47, 56.53], [-133.32, 56.18], [-132.97, 56.03], [-132.75, 55.5], [-132.97, 54.97], [-133.5, 54.75], [-133.75, 54.85], [-134.0, 54.75], [-134.25, 54.85], [-134.5, 54.75], [-134.75, 54.85], [-135.0, 54.75], [-135.25, 54.85], [-135.5, 54.75], [-135.75, 54.85], [-136.0, 54.75], [-136.25, 54.85], [-136.5, 54.75], [-136.75, 54.85], [-137.0, 54.75], [-137.25, 54.85], [-137.5, 54.75], [-137.75, 54.85], [-138.0, 54.75], [-138.25, 54.85], [-138.32, 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"The daily evolution of mean t2m anomalies.", "value": [-4.462622676756969, -3.814397666599138, -4.001624865205348, -3.1268609785793093]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.954693540674441, -5.89557351446922, -5.388762898686025, -3.6324565094594163]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5856050272020055, -1.6287597024219458, -1.7602094918629525, -1.411774678023394]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.6969304502245282, -2.049068137111507, -2.020436379256509, -1.688566764500698]}}