{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:07:33.701346", "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-Sep-02_to_2025-Sep-05_128.5_-16.5"}, "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": 2025090000120}, "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": "September 02 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 05 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": 71475.22143804841}, "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": ["Australia"]}, "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": []}, "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": -16.5}, "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": 128.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "128.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 125.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 128.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -16.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -14.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[129.25, -16.5], [129.03, -17.03], [128.5, -17.25], [128.25, -17.15], [128.0, -17.25], [127.75, -17.15], [127.5, -17.25], [126.97, -17.03], [126.82, -16.68], [126.75, -16.65], [126.5, -16.75], [126.25, -16.65], [126.0, -16.75], [125.7, -16.62], [125.53, -17.03], [125.0, -17.25], [124.47, -17.03], [124.25, -16.5], [124.35, -16.25], [124.25, -16.0], [124.47, -15.47], [124.82, -15.32], [124.85, -15.25], [124.75, -15.0], [124.97, -14.47], [125.5, -14.25], [125.75, -14.35], [125.82, -14.32], [125.97, -13.97], [126.32, -13.82], [126.47, -13.47], [127.0, -13.25], [127.53, -13.47], [127.68, -13.82], [128.03, -13.97], [128.25, -14.5], [128.13, -14.8], [128.53, -14.97], [128.75, -15.5], [128.65, -15.75], [128.68, -15.82], [129.03, -15.97], [129.25, -16.5]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.Australia"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-09-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[127.97, -15.97], [128.5, -15.75], [129.03, -15.97], [129.25, -16.5], [129.03, -17.03], [128.5, -17.25], [127.97, -17.03], [127.75, -16.5], [127.97, -15.97]]]]}, "2025-09-03T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[124.25, -16.0], [124.47, -15.47], [124.82, -15.32], [124.85, -15.25], [124.75, -15.0], [124.97, -14.47], [125.5, -14.25], [125.75, -14.35], [125.82, -14.32], [125.97, -13.97], [126.32, -13.82], [126.47, -13.47], [127.0, -13.25], [127.53, -13.47], [127.68, -13.82], [128.03, -13.97], [128.25, -14.5], [128.13, -14.8], [128.53, -14.97], [128.75, -15.5], [128.65, -15.75], [128.68, -15.82], [129.03, -15.97], [129.25, -16.5], [129.03, -17.03], [128.5, -17.25], [128.25, -17.15], [128.0, -17.25], [127.75, -17.15], [127.5, -17.25], [126.97, -17.03], [126.82, -16.68], [126.75, -16.65], [126.5, -16.75], [126.25, -16.65], [126.0, -16.75], [125.7, -16.62], [125.53, -17.03], [125.0, -17.25], [124.47, -17.03], [124.25, -16.5], [124.35, -16.25], [124.25, -16.0]]]]}, "2025-09-04T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[124.25, -16.0], [124.47, -15.47], [124.82, -15.32], [124.85, -15.25], [124.75, -15.0], [124.97, -14.47], [125.5, -14.25], [125.75, -14.35], [125.82, -14.32], [125.97, -13.97], [126.32, -13.82], [126.47, -13.47], [127.0, -13.25], [127.53, -13.47], [127.68, -13.82], [128.03, -13.97], [128.25, -14.5], [128.13, -14.8], [128.53, -14.97], [128.75, -15.5], [128.65, -15.75], [128.68, -15.82], [129.03, -15.97], [129.25, -16.5], [129.03, -17.03], [128.5, -17.25], [128.25, -17.15], [128.0, -17.25], [127.75, -17.15], [127.5, -17.25], [126.97, -17.03], [126.82, -16.68], [126.75, -16.65], [126.5, -16.75], [126.25, -16.65], [126.0, -16.75], [125.7, -16.62], [125.53, -17.03], [125.0, -17.25], [124.47, -17.03], [124.25, -16.5], [124.35, -16.25], [124.25, -16.0]]]]}, "2025-09-05T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[124.25, -16.0], [124.47, -15.47], [124.82, -15.32], [124.85, -15.25], [124.75, -15.0], [124.97, -14.47], [125.5, -14.25], [125.75, -14.35], [125.82, -14.32], [125.97, -13.97], [126.32, -13.82], [126.47, -13.47], [127.0, -13.25], [127.53, -13.47], [127.68, -13.82], [128.03, -13.97], [128.25, -14.5], [128.13, -14.8], [128.53, -14.97], [128.75, -15.5], [128.65, -15.75], [128.68, -15.82], [129.03, -15.97], [129.25, -16.5], [129.03, -17.03], [128.5, -17.25], [128.25, -17.15], [128.0, -17.25], [127.75, -17.15], [127.5, -17.25], [126.97, -17.03], [126.82, -16.68], [126.75, -16.65], [126.5, -16.75], [126.25, -16.65], [126.0, -16.75], [125.7, -16.62], [125.53, -17.03], [125.0, -17.25], [124.47, -17.03], [124.25, -16.5], [124.35, -16.25], [124.25, -16.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -5.457534685549888}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.492174445286973}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [24.10340525309249, 22.019788784450952, 22.10537406073678, 23.719061364067954]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [24.10340525309249, 20.279700215657556, 20.562276458740257, 22.310732777913415]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.223258698127893, -3.8526845563787497, -4.006779064920555, -2.6282645373599087]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.223258698127893, -5.457534685549888, -4.946791017069074, -3.1713904314527213]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5163087176302954, -2.1837223928414526, -2.3866077517407054, -1.6678627703861872]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5163087176302954, -2.7813938952779758, -2.833886029909567, -2.018958408051907]}}