{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:09:13.124397", "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": "2025-Dec-08_to_2025-Dec-11_209.5_-22.0"}, "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": 2025120000336}, "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": "December 08 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 11 2025"}, "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": 57611.93350471718}, "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": -22.0}, "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": 209.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "209.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 206.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 210.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -23.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -20.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-149.47, -21.97], [-149.25, -22.5], [-149.35, -22.75], [-149.25, -23.0], [-149.47, -23.53], [-150.0, -23.75], [-150.25, -23.65], [-150.5, -23.75], [-151.03, -23.53], [-151.25, -23.0], [-151.04, -22.5], [-151.18, -22.18], [-151.25, -22.15], [-151.5, -22.25], [-151.75, -22.15], [-152.0, -22.25], [-152.53, -22.03], [-152.68, -21.68], [-152.75, -21.65], [-152.82, -21.68], [-152.97, -22.03], [-153.5, -22.25], [-154.03, -22.03], [-154.25, -21.5], [-154.15, -21.25], [-154.25, -21.0], [-154.15, -20.75], [-154.25, -20.5], [-154.03, -19.97], [-153.68, -19.82], [-153.53, -19.47], [-153.0, -19.25], [-152.75, -19.35], [-152.5, -19.25], [-151.97, -19.47], [-151.82, -19.82], [-151.47, -19.97], [-151.32, -20.32], [-150.97, -20.47], [-150.82, -20.82], [-150.75, -20.85], [-150.5, -20.75], [-149.97, -20.97], [-149.75, -21.5], [-149.85, -21.75], [-149.82, -21.82], [-149.47, -21.97]]]]}}, "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": {"2025-12-08T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-151.25, -22.0], [-151.03, -21.47], [-150.5, -21.25], [-149.97, -21.47], [-149.82, -21.82], [-149.47, -21.97], [-149.25, -22.5], [-149.35, -22.75], [-149.25, -23.0], [-149.47, -23.53], [-150.0, -23.75], [-150.25, -23.65], [-150.5, -23.75], [-151.03, -23.53], [-151.25, -23.0], [-151.04, -22.5], [-151.25, -22.0]]]]}, "2025-12-09T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-154.25, -21.0], [-154.15, -20.75], [-154.25, -20.5], [-154.03, -19.97], [-153.68, -19.82], [-153.53, -19.47], [-153.0, -19.25], [-152.75, -19.35], [-152.5, -19.25], [-151.97, -19.47], [-151.82, -19.82], [-151.47, -19.97], [-151.32, -20.32], [-150.97, -20.47], [-150.82, -20.82], [-150.75, -20.85], [-150.5, -20.75], [-149.97, -20.97], [-149.75, -21.5], [-149.85, -21.75], [-149.82, -21.82], [-149.47, -21.97], [-149.25, -22.5], [-149.35, -22.75], [-149.25, -23.0], [-149.47, -23.53], [-150.0, -23.75], [-150.25, -23.65], [-150.5, -23.75], [-151.03, -23.53], [-151.25, -23.0], [-151.04, -22.5], [-151.18, -22.18], [-151.25, -22.15], [-151.5, -22.25], [-151.75, -22.15], [-152.0, -22.25], [-152.53, -22.03], [-152.68, -21.68], [-152.75, -21.65], [-152.82, -21.68], [-152.97, -22.03], [-153.5, -22.25], [-154.03, -22.03], [-154.25, -21.5], [-154.15, -21.25], [-154.25, -21.0]]]]}, "2025-12-10T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-154.25, -21.0], [-154.15, -20.75], [-154.25, -20.5], [-154.03, -19.97], [-153.68, -19.82], [-153.53, -19.47], [-153.0, -19.25], [-152.75, -19.35], [-152.5, -19.25], [-151.97, -19.47], [-151.82, -19.82], [-151.47, -19.97], [-151.32, -20.32], [-150.97, -20.47], [-150.82, -20.82], [-150.75, -20.85], [-150.5, -20.75], [-149.97, -20.97], [-149.75, -21.5], [-149.85, -21.75], [-149.82, -21.82], [-149.47, -21.97], [-149.25, -22.5], [-149.35, -22.75], [-149.25, -23.0], [-149.47, -23.53], [-150.0, -23.75], [-150.25, -23.65], [-150.5, -23.75], [-151.03, -23.53], [-151.25, -23.0], [-151.04, -22.5], [-151.18, -22.18], [-151.25, -22.15], [-151.5, -22.25], [-151.75, -22.15], [-152.0, -22.25], [-152.53, -22.03], [-152.68, -21.68], [-152.75, -21.65], [-152.82, -21.68], [-152.97, -22.03], [-153.5, -22.25], [-154.03, -22.03], [-154.25, -21.5], [-154.15, -21.25], [-154.25, -21.0]]]]}, "2025-12-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-154.25, -21.0], [-154.15, -20.75], [-154.25, -20.5], [-154.03, -19.97], [-153.68, -19.82], [-153.53, -19.47], [-153.0, -19.25], [-152.75, -19.35], [-152.5, -19.25], [-151.97, -19.47], [-151.82, -19.82], [-151.47, -19.97], [-151.32, -20.32], [-150.97, -20.47], [-150.82, -20.82], [-150.75, -20.85], [-150.5, -20.75], [-149.97, -20.97], [-149.75, -21.5], [-149.97, -22.03], [-150.5, -22.25], [-150.75, -22.15], [-151.0, -22.25], [-151.25, -22.15], [-151.5, -22.25], [-151.75, -22.15], [-152.0, -22.25], [-152.53, -22.03], [-152.68, -21.68], [-152.75, -21.65], [-152.82, -21.68], [-152.97, -22.03], [-153.5, -22.25], [-154.03, -22.03], [-154.25, -21.5], [-154.15, -21.25], [-154.25, -21.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -1.8452968139989139}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -1.3847969376171723}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [23.184387461344386, 23.61188837687172, 23.491405487060547, 24.150491333007892]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [22.91074651082357, 22.4542060852051, 22.640701548258505, 23.768579101562523]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-1.2635795646577748, -1.4285029288231699, -1.5850059003719281, -1.1102075884060802]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-1.3656843762819335, -1.8382867810352082, -1.8452968139989139, -1.2591188046607726]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4307299255630879, -1.7191632799992713, -1.9099707268438373, -1.3943171264918828]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.4859567661774877, -2.0656830005179123, -2.1945608008610296, -1.4872134137390456]}}