{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:03:58.760510", "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-Mar-28_to_2025-Mar-30_122.5_51.0"}, "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": 2025030000745}, "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 28 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "March 30 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 3}, "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": 50700.63636947318}, "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": ["China", "Russian Federation"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Asia", "Europe"]}, "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": 51.0}, "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": 122.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "122.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 122.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 127.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 50.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 51.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[122.5, 52.25], [122.75, 52.15], [123.0, 52.25], [123.25, 52.15], [123.5, 52.25], [123.75, 52.15], [124.0, 52.25], [124.25, 52.15], [124.5, 52.25], [124.75, 52.15], [125.0, 52.25], [125.53, 52.03], [125.68, 51.68], [125.75, 51.65], [126.0, 51.75], [126.25, 51.65], [126.32, 51.68], [126.47, 52.03], [127.0, 52.25], [127.25, 52.15], [127.5, 52.25], [128.03, 52.03], [128.25, 51.5], [128.15, 51.25], [128.25, 51.0], [128.15, 50.75], [128.25, 50.5], [128.15, 50.25], [128.25, 50.0], [128.03, 49.47], [127.5, 49.25], [127.25, 49.35], [127.0, 49.25], [126.75, 49.35], [126.5, 49.25], [126.25, 49.35], [126.0, 49.25], [125.75, 49.35], [125.5, 49.25], [124.97, 49.47], [124.75, 50.0], [124.85, 50.25], [124.82, 50.32], [124.75, 50.35], [124.5, 50.25], [124.25, 50.35], [124.18, 50.32], [124.03, 49.97], [123.5, 49.75], [122.97, 49.97], [122.8, 50.38], [122.5, 50.25], [121.97, 50.47], [121.75, 51.0], [121.85, 51.25], [121.75, 51.5], [121.97, 52.03], [122.5, 52.25]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Siberia"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-03-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[121.75, 51.5], [121.97, 52.03], [122.5, 52.25], [122.75, 52.15], [123.0, 52.25], [123.25, 52.15], [123.5, 52.25], [123.75, 52.15], [124.0, 52.25], [124.25, 52.15], [124.5, 52.25], [124.75, 52.15], [125.0, 52.25], [125.53, 52.03], [125.68, 51.68], [125.75, 51.65], [126.0, 51.75], [126.25, 51.65], [126.32, 51.68], [126.47, 52.03], [127.0, 52.25], [127.25, 52.15], [127.5, 52.25], [128.03, 52.03], [128.25, 51.5], [128.15, 51.25], [128.25, 51.0], [128.15, 50.75], [128.25, 50.5], [128.15, 50.25], [128.25, 50.0], [128.03, 49.47], [127.5, 49.25], [127.25, 49.35], [127.0, 49.25], [126.75, 49.35], [126.5, 49.25], [126.25, 49.35], [126.0, 49.25], [125.75, 49.35], [125.5, 49.25], [124.97, 49.47], [124.75, 50.0], [124.85, 50.25], [124.82, 50.32], [124.75, 50.35], [124.5, 50.25], [124.25, 50.35], [124.18, 50.32], [124.03, 49.97], [123.5, 49.75], [122.97, 49.97], [122.8, 50.38], [122.5, 50.25], [121.97, 50.47], [121.75, 51.0], [121.85, 51.25], [121.75, 51.5]]]]}, "2025-03-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[121.75, 51.5], [121.97, 52.03], [122.5, 52.25], [122.75, 52.15], [123.0, 52.25], [123.25, 52.15], [123.5, 52.25], [123.75, 52.15], [124.0, 52.25], [124.25, 52.15], [124.5, 52.25], [124.75, 52.15], [125.0, 52.25], [125.53, 52.03], [125.68, 51.68], [125.75, 51.65], [126.0, 51.75], [126.25, 51.65], [126.32, 51.68], [126.47, 52.03], [127.0, 52.25], [127.25, 52.15], [127.5, 52.25], [128.03, 52.03], [128.25, 51.5], [128.15, 51.25], [128.25, 51.0], [128.15, 50.75], [128.25, 50.5], [128.15, 50.25], [128.25, 50.0], [128.03, 49.47], [127.5, 49.25], [127.25, 49.35], [127.0, 49.25], [126.75, 49.35], [126.5, 49.25], [126.25, 49.35], [126.0, 49.25], [125.75, 49.35], [125.5, 49.25], [124.97, 49.47], [124.75, 50.0], [124.85, 50.25], [124.82, 50.32], [124.75, 50.35], [124.5, 50.25], 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50.32], [124.75, 50.35], [124.5, 50.25], [124.25, 50.35], [124.18, 50.32], [124.03, 49.97], [123.5, 49.75], [122.97, 49.97], [122.8, 50.38], [122.5, 50.25], [121.97, 50.47], [121.75, 51.0], [121.85, 51.25], [121.75, 51.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -12.507601580963069}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -8.275492422718699}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-12.26386695274931, -13.778558745750956, -10.845396814590856]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-16.488809967040993, -18.941626612345345, -14.20169614156083]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-7.802135075173727, -9.72956878326377, -7.2947734097186]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-9.916291944693114, -12.507601580963069, -8.328536948368424]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5775749405463377, -1.9752469165177473, -1.5776642877870348]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.8976434617905042, -2.3887376519865846, -1.9760688836683677]}}