{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:02:55.437167", "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-Jan-11_to_2025-Jan-15_184.0_-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": 2025010000318}, "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": "January 11 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 15 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 5}, "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": 68277.87666453657}, "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": ["Tonga"]}, "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", "Tonga Ridge"]}, "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": 184.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "184.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 183.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 186.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -25.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -21.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-173.47, -25.53], [-173.82, -25.68], [-173.97, -26.03], [-174.5, -26.25], [-175.03, -26.03], [-175.18, -25.68], [-175.53, -25.53], [-175.75, -25.0], [-175.53, -24.47], [-175.18, -24.32], [-175.15, -24.25], [-175.25, -24.0], [-175.15, -23.75], [-175.18, -23.68], [-175.53, -23.53], [-175.75, -23.0], [-175.65, -22.75], [-175.68, -22.68], [-175.75, -22.65], [-176.0, -22.75], [-176.53, -22.53], [-176.68, -22.18], [-177.03, -22.03], [-177.25, -21.5], [-177.03, -20.97], [-176.68, -20.82], [-176.53, -20.47], [-176.0, -20.25], [-175.5, -20.46], [-175.0, -20.25], [-174.75, -20.35], [-174.5, -20.25], [-173.97, -20.47], [-173.75, -21.0], [-173.97, -21.53], [-174.32, -21.68], [-174.37, -21.8], [-173.97, -21.97], [-173.82, -22.32], [-173.47, -22.47], [-173.25, -23.0], [-173.35, -23.25], [-173.25, -23.5], [-173.35, -23.75], [-173.25, -24.0], [-173.35, -24.25], [-173.25, -24.5], [-173.35, -24.75], [-173.25, -25.0], [-173.47, -25.53]]]]}}, "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": {"2025-01-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-175.75, -22.5], [-175.53, -21.97], [-175.0, -21.75], [-174.75, -21.85], [-174.5, -21.75], [-173.97, -21.97], [-173.82, -22.32], [-173.47, -22.47], [-173.25, -23.0], [-173.35, -23.25], [-173.25, -23.5], [-173.35, -23.75], [-173.25, -24.0], [-173.35, -24.25], [-173.25, -24.5], [-173.35, -24.75], [-173.25, -25.0], [-173.47, -25.53], [-173.82, -25.68], [-173.97, -26.03], [-174.5, -26.25], [-175.03, -26.03], [-175.18, -25.68], [-175.53, -25.53], [-175.75, -25.0], [-175.53, -24.47], [-175.18, -24.32], [-175.15, -24.25], [-175.25, -24.0], [-175.15, -23.75], [-175.18, -23.68], [-175.53, -23.53], [-175.75, -23.0], [-175.65, -22.75], [-175.75, -22.5]]]]}, "2025-01-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-176.0, -22.75], [-176.53, -22.53], [-176.75, -22.0], [-176.53, -21.47], [-176.0, -21.25], [-175.47, -21.47], [-175.3, -21.87], [-175.0, -21.75], [-174.75, -21.85], [-174.5, -21.75], [-173.97, -21.97], [-173.82, -22.32], [-173.47, -22.47], [-173.25, -23.0], [-173.35, -23.25], [-173.25, -23.5], [-173.35, -23.75], [-173.25, -24.0], [-173.35, -24.25], [-173.25, -24.5], [-173.35, -24.75], [-173.25, -25.0], [-173.47, -25.53], [-173.82, -25.68], [-173.97, -26.03], [-174.5, -26.25], [-175.03, -26.03], [-175.18, -25.68], [-175.53, -25.53], [-175.75, -25.0], [-175.53, -24.47], [-175.18, -24.32], [-175.15, -24.25], [-175.25, -24.0], [-175.15, -23.75], [-175.18, -23.68], [-175.53, -23.53], [-175.75, -23.0], [-175.65, -22.75], [-175.7, -22.62], [-176.0, -22.75]]]]}, "2025-01-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-177.03, -22.03], [-177.25, -21.5], [-177.03, -20.97], [-176.68, -20.82], [-176.53, -20.47], [-176.0, -20.25], [-175.5, -20.46], [-175.0, -20.25], [-174.75, -20.35], [-174.5, -20.25], [-173.97, -20.47], [-173.75, -21.0], [-173.97, -21.53], [-174.32, -21.68], [-174.37, -21.8], [-173.97, -21.97], [-173.82, -22.32], [-173.47, -22.47], [-173.25, -23.0], [-173.35, -23.25], [-173.25, -23.5], [-173.35, -23.75], [-173.25, -24.0], [-173.35, -24.25], [-173.25, -24.5], [-173.35, -24.75], [-173.25, -25.0], [-173.47, -25.53], [-173.82, -25.68], [-173.97, -26.03], [-174.5, -26.25], [-175.03, -26.03], [-175.18, -25.68], [-175.53, -25.53], [-175.75, -25.0], [-175.53, -24.47], [-175.18, -24.32], [-175.15, -24.25], [-175.25, -24.0], [-175.15, -23.75], [-175.18, -23.68], [-175.53, -23.53], [-175.75, -23.0], [-175.65, -22.75], [-175.68, -22.68], [-175.75, -22.65], [-176.0, -22.75], [-176.53, -22.53], [-176.68, -22.18], [-177.03, -22.03]]]]}, "2025-01-14T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-175.03, -25.53], [-175.25, -25.0], [-175.03, -24.47], [-174.5, -24.25], [-174.25, -24.35], [-174.0, -24.25], [-173.47, -24.47], [-173.25, -25.0], [-173.47, -25.53], [-174.0, -25.75], [-174.25, -25.65], [-174.5, -25.75], [-175.03, -25.53]]], [[[-177.25, -21.5], [-177.03, -20.97], [-176.68, -20.82], [-176.53, -20.47], [-176.0, -20.25], [-175.5, -20.46], [-175.0, -20.25], [-174.75, -20.35], [-174.5, -20.25], [-173.97, -20.47], [-173.75, -21.0], [-173.97, -21.53], [-174.32, -21.68], [-174.47, -22.03], [-174.82, -22.18], [-174.97, -22.53], [-175.5, -22.75], [-175.75, -22.65], [-176.0, -22.75], [-176.53, -22.53], [-176.68, -22.18], [-177.03, -22.03], [-177.25, -21.5]]]]}, "2025-01-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-177.03, -22.03], [-177.25, -21.5], [-177.03, -20.97], [-176.68, -20.82], [-176.53, -20.47], [-176.0, -20.25], [-175.5, -20.46], [-175.0, -20.25], [-174.75, -20.35], [-174.5, -20.25], [-173.97, -20.47], [-173.75, -21.0], [-173.97, -21.53], [-174.32, -21.68], [-174.47, -22.03], [-174.82, -22.18], [-174.97, -22.53], [-175.5, -22.75], [-175.75, -22.65], [-176.0, -22.75], [-176.53, -22.53], [-176.68, -22.18], [-177.03, -22.03]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -2.374267840918378}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -1.7390098132520748}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [22.74991582234702, 22.87649307250979, 23.286669667561853, 23.693651858243072, 24.53754097267432]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [22.25484746297201, 21.99111709594729, 22.100349680582724, 22.54618352254232, 24.224534606933616]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-1.863618263806264, -1.8120788607607068, -1.782579005486923, -1.7781647530561289, -1.237387983259642]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-2.374267840918378, -2.0767463829155304, -2.1256555238190913, -2.211738152028204, -1.3610796376901817]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.9154597205743669, -1.8721746158061814, -1.9484361003158084, -2.1226805538055404, -1.573842913917871]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.431137729425968, -2.115139381089795, -2.57642604032069, -2.8025033036456044, -1.7702718275332057]}}