{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:34:34.160260", "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-21_to_2023-Mar-24_175.5_-38.0"}, "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": 2023030000716}, "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 21 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "March 24 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": 50695.43630635874}, "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": ["New Zealand"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["New-Zealand"]}, "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": -38.0}, "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": 175.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "175.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 173.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 176.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -40.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -36.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2023-03-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[174.32, -38.32], [174.35, -38.25], [174.25, -38.0], [174.35, -37.75], [174.25, -37.5], [174.35, -37.25], [174.25, -37.0], [174.47, -36.47], [175.0, -36.25], [175.53, -36.47], [175.68, -36.82], [176.03, -36.97], [176.18, -37.32], [176.25, -37.35], [176.5, -37.25], [177.03, -37.47], [177.25, -38.0], [177.15, -38.25], [177.25, -38.5], [177.03, -39.03], [176.68, -39.18], [176.65, -39.25], [176.75, -39.5], [176.65, -39.75], [176.75, -40.0], [176.53, -40.53], [176.0, -40.75], [175.47, -40.53], [175.32, -40.18], [175.25, -40.15], [175.0, -40.25], [174.75, -40.15], [174.5, -40.25], [174.25, -40.15], [174.0, -40.25], [173.47, -40.03], [173.25, -39.5], [173.47, -38.97], [173.82, -38.82], [173.97, -38.47], [174.32, -38.32]]]]}, "2023-03-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[174.32, -38.32], [174.35, -38.25], [174.25, -38.0], [174.35, -37.75], [174.25, -37.5], [174.35, -37.25], [174.25, -37.0], [174.47, -36.47], [175.0, -36.25], [175.53, -36.47], [175.68, -36.82], [176.03, -36.97], [176.18, -37.32], [176.25, -37.35], [176.5, -37.25], [177.03, -37.47], [177.25, -38.0], [177.15, -38.25], [177.25, -38.5], [177.03, -39.03], [176.68, -39.18], [176.65, -39.25], [176.75, -39.5], [176.65, -39.75], [176.75, -40.0], [176.53, -40.53], [176.0, -40.75], [175.47, -40.53], [175.32, -40.18], [175.25, -40.15], [175.0, -40.25], [174.75, -40.15], [174.5, -40.25], [174.25, -40.15], [174.0, -40.25], [173.47, -40.03], [173.25, -39.5], [173.47, -38.97], [173.82, -38.82], [173.97, -38.47], [174.32, -38.32]]]]}, "2023-03-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[174.32, -38.32], [174.35, -38.25], [174.25, -38.0], [174.35, -37.75], [174.25, -37.5], [174.35, -37.25], [174.25, -37.0], [174.47, -36.47], [175.0, -36.25], [175.53, -36.47], [175.68, -36.82], [176.03, -36.97], [176.18, -37.32], [176.25, -37.35], [176.5, -37.25], [177.03, -37.47], [177.25, -38.0], [177.15, -38.25], [177.25, -38.5], [177.03, -39.03], [176.68, -39.18], [176.65, -39.25], [176.75, -39.5], [176.65, -39.75], [176.75, -40.0], [176.53, -40.53], [176.0, -40.75], [175.47, -40.53], [175.32, -40.18], [175.25, -40.15], [175.0, -40.25], [174.75, -40.15], [174.5, -40.25], [174.25, -40.15], [174.0, -40.25], [173.47, -40.03], [173.25, -39.5], [173.47, -38.97], [173.82, -38.82], [173.97, -38.47], [174.32, -38.32]]]]}, "2023-03-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[174.25, -37.5], [174.47, -36.97], [175.0, -36.75], [175.25, -36.85], [175.5, -36.75], [176.03, -36.97], [176.25, -37.5], [176.15, -37.75], [176.18, -37.82], [176.53, -37.97], [176.75, -38.5], [176.53, -39.03], [176.0, -39.25], [175.75, -39.15], [175.5, -39.25], [174.97, -39.03], [174.75, -38.5], [174.85, -38.25], [174.82, -38.18], [174.47, -38.03], [174.25, -37.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -5.451512747078311}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.803554283699494}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [12.114151956954288, 10.955119489030665, 11.572987853032089, 13.404590687729922]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [8.340567963066576, 6.61402140245076, 6.879099553376534, 11.655271090092981]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.3294070853302227, -4.475832828969614, -3.8179218724248636, -2.9110587540693813]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.8595850691564806, -5.451512747078311, -5.26853618824282, -3.1836954864151608]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.61277785324679, -2.157875124671129, -1.799184487039381, -1.437178608744532]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.8711851778230595, -2.5036589295741267, -2.096752926842749, -1.5142572637476643]}}