{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-08-31 16:20:14.807399", "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": "2026-Jul-30_to_2026-Aug-02_86.0_30.5"}, "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": 2026070000989}, "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": "July 30 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 02 2026"}, "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": 206741.1885060931}, "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"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Tibetan-Plateau"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Asia"]}, "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": 30.5}, "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": 86.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "86.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 79.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 88.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 30.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 35.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-07-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[81.25, 34.0], [81.47, 34.53], [81.82, 34.68], [81.97, 35.03], [82.5, 35.25], [82.75, 35.15], [82.82, 35.18], [82.97, 35.53], [83.32, 35.68], [83.47, 36.03], [84.0, 36.25], [84.25, 36.15], [84.5, 36.25], [84.75, 36.15], [85.0, 36.25], [85.25, 36.15], [85.5, 36.25], [86.03, 36.03], [86.18, 35.68], [86.53, 35.53], [86.75, 35.0], [86.53, 34.47], [86.18, 34.32], [86.15, 34.25], [86.18, 34.18], [86.53, 34.03], [86.75, 33.5], [86.53, 32.97], [86.0, 32.75], [85.75, 32.85], [85.5, 32.75], [85.25, 32.85], [85.0, 32.75], [84.75, 32.85], [84.68, 32.82], [84.53, 32.47], [84.0, 32.25], [83.75, 32.35], [83.5, 32.25], [82.97, 32.47], [82.82, 32.82], [82.75, 32.85], [82.5, 32.75], [81.97, 32.97], [81.82, 33.32], [81.47, 33.47], [81.25, 34.0]]]]}, "2026-07-31T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[78.97, 34.03], [79.32, 34.18], [79.35, 34.25], [79.25, 34.5], [79.47, 35.03], [80.0, 35.25], [80.25, 35.15], [80.5, 35.25], [81.03, 35.03], [81.25, 34.5], [81.13, 34.2], [81.3, 34.13], [81.47, 34.53], [81.82, 34.68], [81.97, 35.03], [82.5, 35.25], [82.75, 35.15], [82.82, 35.18], [82.97, 35.53], [83.32, 35.68], [83.47, 36.03], [84.0, 36.25], [84.25, 36.15], [84.5, 36.25], [84.75, 36.15], [85.0, 36.25], [85.25, 36.15], [85.5, 36.25], [86.03, 36.03], [86.18, 35.68], [86.53, 35.53], [86.75, 35.0], [86.53, 34.47], [86.18, 34.32], [86.15, 34.25], [86.18, 34.18], [86.53, 34.03], [86.75, 33.5], [86.63, 33.2], [86.75, 33.15], [86.82, 33.18], [86.97, 33.53], [87.5, 33.75], [88.03, 33.53], [88.18, 33.18], [88.25, 33.15], [88.5, 33.25], [89.03, 33.03], [89.25, 32.5], [89.03, 31.97], [88.5, 31.75], [88.25, 31.85], [88.0, 31.75], [87.75, 31.85], [87.68, 31.82], [87.53, 31.47], [87.18, 31.32], [87.04, 31.0], [87.25, 30.5], [87.03, 29.97], [86.5, 29.75], [86.25, 29.85], [86.0, 29.75], [85.47, 29.97], [85.32, 30.32], [84.97, 30.47], [84.75, 31.0], [84.85, 31.25], [84.82, 31.32], [84.75, 31.35], [84.5, 31.25], [84.25, 31.35], [84.0, 31.25], [83.75, 31.35], [83.5, 31.25], [83.25, 31.35], [83.0, 31.25], [82.75, 31.35], [82.5, 31.25], [82.25, 31.35], [82.0, 31.25], [81.47, 31.47], [81.32, 31.82], [80.97, 31.97], [80.82, 32.32], [80.75, 32.35], [80.5, 32.25], [80.25, 32.35], [80.0, 32.25], [79.75, 32.35], [79.5, 32.25], [78.97, 32.47], [78.75, 33.0], [78.85, 33.25], [78.75, 33.5], [78.97, 34.03]], [[85.0, 32.75], [84.75, 32.85], [84.68, 32.82], [84.65, 32.75], [84.68, 32.68], [84.75, 32.65], [85.0, 32.75]], [[85.25, 32.65], [85.5, 32.75], [85.25, 32.85], [85.0, 32.75], [85.25, 32.65]], [[85.75, 32.65], [85.82, 32.68], [85.88, 32.8], [85.75, 32.85], [85.5, 32.75], [85.75, 32.65]]]]}, "2026-08-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[78.97, 34.03], [79.32, 34.18], [79.35, 34.25], [79.25, 34.5], [79.47, 35.03], [80.0, 35.25], [80.25, 35.15], [80.5, 35.25], [81.03, 35.03], [81.25, 34.5], [81.13, 34.2], [81.3, 34.13], [81.47, 34.53], [81.82, 34.68], [81.97, 35.03], [82.5, 35.25], [82.75, 35.15], [82.82, 35.18], [82.97, 35.53], [83.32, 35.68], [83.47, 36.03], [84.0, 36.25], [84.25, 36.15], [84.5, 36.25], [84.75, 36.15], [85.0, 36.25], [85.25, 36.15], [85.5, 36.25], [86.03, 36.03], [86.18, 35.68], [86.53, 35.53], [86.75, 35.0], [86.53, 34.47], [86.18, 34.32], [86.15, 34.25], [86.18, 34.18], [86.53, 34.03], [86.75, 33.5], [86.63, 33.2], [86.75, 33.15], [86.82, 33.18], [86.97, 33.53], [87.5, 33.75], [88.03, 33.53], [88.18, 33.18], [88.25, 33.15], [88.5, 33.25], [89.03, 33.03], [89.25, 32.5], [89.03, 31.97], [88.5, 31.75], [88.25, 31.85], [88.0, 31.75], [87.75, 31.85], [87.68, 31.82], [87.53, 31.47], [87.18, 31.32], [87.04, 31.0], [87.25, 30.5], [87.03, 29.97], [86.5, 29.75], [86.25, 29.85], [86.0, 29.75], [85.47, 29.97], [85.32, 30.32], [84.97, 30.47], [84.75, 31.0], [84.85, 31.25], [84.82, 31.32], [84.75, 31.35], [84.5, 31.25], [84.25, 31.35], [84.0, 31.25], [83.75, 31.35], [83.5, 31.25], [83.25, 31.35], [83.0, 31.25], [82.75, 31.35], [82.5, 31.25], [82.25, 31.35], [82.0, 31.25], [81.47, 31.47], [81.32, 31.82], [80.97, 31.97], [80.82, 32.32], [80.75, 32.35], [80.5, 32.25], [80.25, 32.35], [80.0, 32.25], [79.75, 32.35], [79.5, 32.25], [78.97, 32.47], [78.75, 33.0], [78.85, 33.25], [78.75, 33.5], [78.97, 34.03]], [[85.0, 32.75], [84.75, 32.85], [84.68, 32.82], [84.65, 32.75], [84.68, 32.68], [84.75, 32.65], [85.0, 32.75]], [[85.25, 32.65], [85.5, 32.75], [85.25, 32.85], [85.0, 32.75], [85.25, 32.65]], [[85.75, 32.65], [85.82, 32.68], [85.88, 32.8], [85.75, 32.85], [85.5, 32.75], [85.75, 32.65]]]]}, "2026-08-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[78.97, 34.03], [79.32, 34.18], [79.35, 34.25], [79.25, 34.5], [79.47, 35.03], [80.0, 35.25], [80.25, 35.15], [80.5, 35.25], [81.03, 35.03], [81.25, 34.5], [81.13, 34.2], [81.53, 34.03], [81.68, 33.68], [81.75, 33.65], [82.0, 33.75], [82.25, 33.65], [82.5, 33.75], [82.75, 33.65], [83.0, 33.75], [83.53, 33.53], [83.68, 33.18], [83.75, 33.15], [84.0, 33.25], [84.53, 33.03], [84.68, 32.68], [84.75, 32.65], [85.0, 32.75], [85.25, 32.65], [85.5, 32.75], [85.75, 32.65], [85.82, 32.68], [85.97, 33.03], [86.5, 33.25], [86.75, 33.15], [86.82, 33.18], [86.97, 33.53], [87.5, 33.75], [88.03, 33.53], [88.18, 33.18], [88.25, 33.15], [88.5, 33.25], [89.03, 33.03], [89.25, 32.5], [89.03, 31.97], [88.5, 31.75], [88.25, 31.85], [88.0, 31.75], [87.75, 31.85], [87.68, 31.82], [87.53, 31.47], [87.18, 31.32], [87.04, 31.0], [87.25, 30.5], [87.03, 29.97], [86.5, 29.75], [86.25, 29.85], [86.0, 29.75], [85.47, 29.97], [85.32, 30.32], [84.97, 30.47], [84.75, 31.0], [84.85, 31.25], [84.82, 31.32], [84.75, 31.35], [84.5, 31.25], [84.25, 31.35], [84.0, 31.25], [83.75, 31.35], [83.5, 31.25], [83.25, 31.35], [83.0, 31.25], [82.75, 31.35], [82.5, 31.25], [82.25, 31.35], [82.0, 31.25], [81.47, 31.47], [81.32, 31.82], [80.97, 31.97], [80.82, 32.32], [80.75, 32.35], [80.5, 32.25], [80.25, 32.35], [80.0, 32.25], [79.75, 32.35], [79.5, 32.25], [78.97, 32.47], [78.75, 33.0], [78.85, 33.25], [78.75, 33.5], [78.97, 34.03]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.920031945197138}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.772811213426514}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [3.0589911687941935, 4.520851135253963, 4.9046508789062955, 6.7108007077818]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [1.0423942565918196, 0.6819981892903684, 0.5197438557942746, 1.4522377014160384]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.8164807003765775, -3.13750771262374, -2.6924156621950055, -2.2334221494151976]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.7945466544482542, -4.920031945197138, -4.310956373290537, -4.537748452670826]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.683430538011962, -1.9063609187553694, -1.658250838452382, -1.4208700816012858]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.36229016008809, -2.9746080917267546, -3.1024169735981713, -2.2132287591823827]}}