{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:52:28.412855", "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-Apr-22_to_2023-Apr-25_207.0_-25.0"}, "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": 2023040000778}, "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 22 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 25 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": 164239.79955539326}, "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": ["French Polynesia"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Oceania"]}, "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": -25.0}, "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": 207.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "207.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 206.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 211.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -26.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -21.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-154.53, -24.97], [-154.18, -24.82], [-154.15, -24.75], [-154.25, -24.5], [-154.03, -23.97], [-153.68, -23.82], [-153.53, -23.47], [-153.18, -23.32], [-153.15, -23.25], [-153.25, -23.0], [-153.03, -22.47], [-152.68, -22.32], [-152.65, -22.25], [-152.75, -22.0], [-152.53, -21.47], [-152.18, -21.32], [-152.03, -20.97], [-151.5, -20.75], [-151.25, -20.85], [-151.0, -20.75], [-150.75, -20.85], [-150.5, -20.75], [-149.97, -20.97], [-149.82, -21.32], [-149.75, -21.35], [-149.68, -21.32], [-149.53, -20.97], [-149.0, -20.75], [-148.47, -20.97], [-148.25, -21.5], [-148.35, -21.75], [-148.25, -22.0], [-148.35, -22.25], [-148.25, -22.5], [-148.47, -23.03], [-148.82, -23.18], [-148.85, -23.25], [-148.75, -23.5], [-148.97, -24.03], [-149.32, -24.18], [-149.47, -24.53], [-149.82, -24.68], [-149.97, -25.03], [-150.5, -25.25], [-150.75, -25.15], [-151.0, -25.25], [-151.25, -25.15], [-151.32, -25.18], [-151.47, -25.53], [-151.82, -25.68], [-151.97, -26.03], [-152.32, -26.18], [-152.47, -26.53], [-153.0, -26.75], [-153.25, -26.65], [-153.32, -26.68], [-153.47, -27.03], [-154.0, -27.25], [-154.53, -27.03], [-154.75, -26.5], [-154.65, -26.25], [-154.75, -26.0], [-154.65, -25.75], [-154.75, -25.5], [-154.53, -24.97]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["S.Pacific-Ocean"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2023-04-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-154.75, -26.0], [-154.65, -25.75], [-154.75, -25.5], [-154.53, -24.97], [-154.18, -24.82], [-154.15, -24.75], [-154.25, -24.5], [-154.03, -23.97], [-153.5, -23.75], [-153.25, -23.85], [-153.0, -23.75], [-152.47, -23.97], [-152.32, -24.32], [-152.25, -24.35], [-152.0, -24.25], [-151.47, -24.47], [-151.25, -25.0], [-151.47, -25.53], [-151.82, -25.68], [-151.97, -26.03], [-152.32, -26.18], [-152.47, -26.53], [-153.0, -26.75], [-153.25, -26.65], [-153.32, -26.68], [-153.47, -27.03], [-154.0, -27.25], [-154.53, -27.03], [-154.75, -26.5], [-154.65, -26.25], [-154.75, -26.0]]]]}, "2023-04-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-154.75, -26.0], [-154.65, -25.75], [-154.75, -25.5], [-154.53, -24.97], [-154.18, -24.82], [-154.15, -24.75], [-154.25, -24.5], [-154.03, -23.97], [-153.68, -23.82], [-153.53, -23.47], [-153.18, -23.32], [-153.15, -23.25], [-153.25, -23.0], [-153.03, -22.47], [-152.68, -22.32], [-152.65, -22.25], [-152.75, -22.0], [-152.53, -21.47], [-152.18, -21.32], [-152.03, -20.97], [-151.5, -20.75], [-151.25, -20.85], [-151.0, -20.75], [-150.75, -20.85], [-150.5, -20.75], [-149.97, -20.97], [-149.82, -21.32], [-149.75, -21.35], [-149.68, -21.32], [-149.53, -20.97], [-149.0, -20.75], [-148.47, -20.97], [-148.25, -21.5], [-148.35, -21.75], [-148.25, -22.0], [-148.35, -22.25], [-148.25, -22.5], [-148.47, -23.03], [-148.82, -23.18], [-148.85, -23.25], [-148.75, -23.5], [-148.97, -24.03], [-149.32, -24.18], [-149.47, -24.53], [-149.82, -24.68], [-149.97, -25.03], [-150.5, -25.25], [-150.75, -25.15], [-151.0, -25.25], [-151.25, -25.15], [-151.32, -25.18], [-151.47, -25.53], [-151.82, -25.68], [-151.97, -26.03], [-152.32, -26.18], [-152.47, -26.53], [-153.0, -26.75], [-153.25, -26.65], [-153.32, -26.68], [-153.47, -27.03], [-154.0, -27.25], [-154.53, -27.03], [-154.75, -26.5], [-154.65, -26.25], [-154.75, -26.0]]]]}, "2023-04-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-154.75, -26.0], [-154.65, -25.75], [-154.75, -25.5], [-154.53, -24.97], [-154.18, -24.82], [-154.15, -24.75], [-154.25, -24.5], [-154.03, -23.97], [-153.68, -23.82], [-153.53, -23.47], [-153.18, -23.32], [-153.15, -23.25], [-153.25, -23.0], [-153.03, -22.47], [-152.68, -22.32], [-152.65, -22.25], [-152.75, -22.0], [-152.53, -21.47], [-152.18, -21.32], [-152.03, -20.97], [-151.5, -20.75], [-151.25, -20.85], [-151.0, -20.75], [-150.75, -20.85], [-150.5, -20.75], [-149.97, -20.97], [-149.82, -21.32], [-149.75, -21.35], [-149.68, -21.32], [-149.53, -20.97], [-149.0, -20.75], [-148.47, -20.97], [-148.25, -21.5], [-148.35, -21.75], [-148.25, -22.0], [-148.35, -22.25], [-148.25, -22.5], [-148.47, -23.03], [-148.82, -23.18], [-148.85, -23.25], [-148.75, -23.5], [-148.97, -24.03], [-149.32, -24.18], [-149.47, -24.53], [-149.82, -24.68], [-149.97, -25.03], [-150.5, -25.25], [-150.75, -25.15], [-151.0, -25.25], [-151.25, -25.15], [-151.32, -25.18], [-151.47, -25.53], [-151.82, -25.68], [-151.97, -26.03], [-152.32, -26.18], [-152.47, -26.53], [-153.0, -26.75], [-153.25, -26.65], [-153.32, -26.68], [-153.47, -27.03], [-154.0, -27.25], [-154.53, -27.03], [-154.75, -26.5], [-154.65, -26.25], [-154.75, -26.0]]]]}, "2023-04-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-154.25, -25.0], [-154.15, -24.75], [-154.25, -24.5], [-154.03, -23.97], [-153.68, -23.82], [-153.53, -23.47], [-153.18, -23.32], [-153.15, -23.25], [-153.25, -23.0], [-153.03, -22.47], [-152.68, -22.32], [-152.65, -22.25], [-152.75, -22.0], [-152.53, -21.47], [-152.18, -21.32], [-152.03, -20.97], [-151.5, -20.75], [-151.25, -20.85], [-151.0, -20.75], [-150.75, -20.85], [-150.5, -20.75], [-149.97, -20.97], [-149.82, -21.32], [-149.75, -21.35], [-149.68, -21.32], [-149.53, -20.97], [-149.0, -20.75], [-148.47, -20.97], [-148.25, -21.5], [-148.35, -21.75], [-148.25, -22.0], [-148.35, -22.25], [-148.25, -22.5], [-148.47, -23.03], [-148.82, -23.18], [-148.85, -23.25], [-148.75, -23.5], [-148.97, -24.03], [-149.32, -24.18], [-149.47, -24.53], [-149.82, -24.68], [-149.97, -25.03], [-150.5, -25.25], [-150.75, -25.15], [-151.0, -25.25], [-151.25, -25.15], [-151.32, -25.18], [-151.47, -25.53], [-151.82, -25.68], [-151.97, -26.03], [-152.32, -26.18], [-152.47, -26.53], [-153.0, -26.75], [-153.53, -26.53], [-153.68, -26.18], [-154.03, -26.03], [-154.25, -25.5], [-154.15, -25.25], [-154.25, -25.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -2.040805819606362}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -1.5499502869424655}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [21.88219322154646, 22.842912839993232, 22.731661731670954, 22.668547349766243]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [21.27793354497601, 21.129283452484685, 21.20759019763642, 21.405864056123107]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-1.4574647848279645, -1.4898446643768073, -1.5404659906633091, -1.6486727373610255]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-1.5882516886340454, -1.6616869503949374, -1.8107946765350675, -2.040805819606362]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3995780343193154, -1.5747829248435639, -1.6442878554474085, -1.7817924194212742]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5222219307066254, -1.9210891070092366, -1.9693009777209178, -2.1199192238335214]}}