{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:22:51.412157", "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": "2021-Jan-04_to_2021-Jan-11_77.0_40.0"}, "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": 2021010000274}, "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 04 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 11 2021"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 8}, "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": 96402.17500301215}, "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": ["E.C.Asia", "Tibetan-Plateau", "W.C.Asia"]}, "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": 40.0}, "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": 77.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "77.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 74.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 82.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 36.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 41.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-01-04T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[77.47, 36.97], [77.25, 37.5], [77.47, 38.03], [78.0, 38.25], [78.53, 38.03], [78.75, 37.5], [78.53, 36.97], [78.0, 36.75], [77.47, 36.97]]], [[[74.97, 40.03], [75.5, 40.25], [75.8, 40.13], [75.97, 40.53], [76.5, 40.75], [76.75, 40.65], [77.0, 40.75], [77.53, 40.53], [77.75, 40.0], [77.53, 39.47], [77.0, 39.25], [76.75, 39.35], [76.63, 39.3], [76.75, 39.0], [76.53, 38.47], [76.0, 38.25], [75.47, 38.47], [75.32, 38.82], [74.97, 38.97], [74.75, 39.5], [74.97, 40.03]]]]}, "2021-01-05T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[74.75, 39.5], [74.97, 40.03], [75.32, 40.18], [75.47, 40.53], [76.0, 40.75], [76.25, 40.65], [76.5, 40.75], [76.75, 40.65], [77.0, 40.75], [77.25, 40.65], [77.5, 40.75], [77.75, 40.65], [78.0, 40.75], [78.53, 40.53], [78.75, 40.0], [78.53, 39.47], [78.0, 39.25], [77.75, 39.35], [77.5, 39.25], [77.25, 39.35], [77.0, 39.25], [76.75, 39.35], [76.63, 39.3], [76.68, 39.18], [77.03, 39.03], [77.18, 38.68], [77.53, 38.53], [77.68, 38.18], [77.75, 38.15], [78.0, 38.25], [78.25, 38.15], [78.5, 38.25], [78.75, 38.15], [79.0, 38.25], [79.53, 38.03], [79.68, 37.68], [79.75, 37.65], [80.0, 37.75], [80.25, 37.65], [80.5, 37.75], [81.03, 37.53], [81.18, 37.18], [81.25, 37.15], [81.32, 37.18], [81.47, 37.53], [82.0, 37.75], [82.53, 37.53], [82.75, 37.0], [82.53, 36.47], [82.18, 36.32], [82.03, 35.97], [81.5, 35.75], [81.25, 35.85], [81.0, 35.75], [80.47, 35.97], [80.32, 36.32], [80.25, 36.35], [80.0, 36.25], [79.75, 36.35], [79.5, 36.25], [79.25, 36.35], [79.0, 36.25], [78.47, 36.47], [78.32, 36.82], [78.25, 36.85], [78.0, 36.75], [77.75, 36.85], [77.5, 36.75], [77.25, 36.85], [77.0, 36.75], [76.47, 36.97], [76.25, 37.5], [76.35, 37.75], [76.32, 37.82], [75.97, 37.97], [75.82, 38.32], [75.47, 38.47], [75.32, 38.82], [74.97, 38.97], [74.75, 39.5]]]]}, "2021-01-06T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[74.75, 39.5], [74.97, 40.03], [75.32, 40.18], [75.47, 40.53], [76.0, 40.75], [76.25, 40.65], [76.5, 40.75], [76.75, 40.65], [77.0, 40.75], [77.25, 40.65], [77.5, 40.75], [77.75, 40.65], [78.0, 40.75], [78.25, 40.65], [78.5, 40.75], [79.03, 40.53], [79.25, 40.0], [79.03, 39.47], [78.5, 39.25], [78.25, 39.35], [78.0, 39.25], [77.75, 39.35], [77.5, 39.25], [77.25, 39.35], [77.0, 39.25], [76.75, 39.35], [76.63, 39.3], [76.68, 39.18], [77.03, 39.03], [77.18, 38.68], [77.53, 38.53], [77.68, 38.18], [77.75, 38.15], [78.0, 38.25], [78.25, 38.15], [78.5, 38.25], [78.75, 38.15], [79.0, 38.25], [79.53, 38.03], [79.68, 37.68], [79.75, 37.65], [80.0, 37.75], [80.25, 37.65], [80.5, 37.75], [81.03, 37.53], [81.18, 37.18], [81.25, 37.15], [81.32, 37.18], [81.47, 37.53], [82.0, 37.75], [82.53, 37.53], [82.75, 37.0], [82.53, 36.47], [82.18, 36.32], [82.03, 35.97], [81.5, 35.75], [81.25, 35.85], [81.0, 35.75], [80.47, 35.97], [80.32, 36.32], [80.25, 36.35], [80.0, 36.25], [79.75, 36.35], [79.5, 36.25], [79.25, 36.35], [79.0, 36.25], [78.47, 36.47], [78.32, 36.82], [78.25, 36.85], [78.0, 36.75], [77.75, 36.85], [77.5, 36.75], [77.25, 36.85], [77.0, 36.75], [76.47, 36.97], [76.25, 37.5], [76.35, 37.75], [76.32, 37.82], [75.97, 37.97], [75.82, 38.32], [75.47, 38.47], [75.32, 38.82], [74.97, 38.97], [74.75, 39.5]]]]}, "2021-01-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[74.25, 39.5], [74.47, 40.03], [75.0, 40.25], [75.25, 40.15], [75.32, 40.18], [75.47, 40.53], [76.0, 40.75], [76.25, 40.65], [76.5, 40.75], [76.75, 40.65], [77.0, 40.75], [77.25, 40.65], [77.5, 40.75], [77.75, 40.65], [78.0, 40.75], [78.25, 40.65], [78.38, 40.7], [78.25, 41.0], [78.47, 41.53], [79.0, 41.75], [79.53, 41.53], [79.75, 41.0], [79.53, 40.47], [79.13, 40.3], [79.25, 40.0], [79.03, 39.47], [78.5, 39.25], [78.25, 39.35], [78.0, 39.25], [77.75, 39.35], [77.5, 39.25], [77.25, 39.35], [77.0, 39.25], [76.75, 39.35], [76.68, 39.32], [76.65, 39.25], [76.68, 39.18], [77.03, 39.03], [77.18, 38.68], [77.53, 38.53], [77.68, 38.18], [77.75, 38.15], [78.0, 38.25], [78.25, 38.15], [78.5, 38.25], [78.75, 38.15], [79.0, 38.25], [79.53, 38.03], [79.68, 37.68], [79.75, 37.65], [80.0, 37.75], [80.25, 37.65], [80.5, 37.75], [81.03, 37.53], [81.18, 37.18], [81.25, 37.15], [81.32, 37.18], [81.47, 37.53], [82.0, 37.75], [82.53, 37.53], [82.75, 37.0], [82.53, 36.47], [82.18, 36.32], [82.03, 35.97], [81.5, 35.75], [81.25, 35.85], [81.0, 35.75], [80.47, 35.97], [80.32, 36.32], [80.25, 36.35], [80.0, 36.25], [79.75, 36.35], [79.5, 36.25], [79.25, 36.35], [79.0, 36.25], [78.47, 36.47], [78.32, 36.82], [78.25, 36.85], [78.0, 36.75], [77.75, 36.85], [77.5, 36.75], [77.25, 36.85], [77.0, 36.75], [76.75, 36.85], [76.5, 36.75], [75.97, 36.97], [75.82, 37.32], [75.47, 37.47], [75.25, 38.0], [75.38, 38.3], [74.97, 38.47], [74.82, 38.82], [74.47, 38.97], [74.25, 39.5]]]]}, "2021-01-08T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[73.97, 38.97], [73.75, 39.5], [73.97, 40.03], [74.5, 40.25], [74.75, 40.15], [74.82, 40.18], [74.97, 40.53], [75.5, 40.75], [75.75, 40.65], [76.0, 40.75], [76.25, 40.65], [76.32, 40.68], [76.47, 41.03], [77.0, 41.25], [77.25, 41.15], [77.5, 41.25], [77.75, 41.15], [78.0, 41.25], [78.25, 41.15], [78.32, 41.18], [78.47, 41.53], [79.0, 41.75], [79.53, 41.53], [79.75, 41.0], [79.53, 40.47], [79.18, 40.32], [79.15, 40.25], [79.25, 40.0], [79.03, 39.47], [78.5, 39.25], [78.25, 39.35], [78.0, 39.25], [77.75, 39.35], [77.63, 39.3], [77.75, 39.0], [77.65, 38.75], [77.75, 38.5], [77.65, 38.25], [77.68, 38.18], [77.75, 38.15], [78.0, 38.25], [78.25, 38.15], [78.5, 38.25], [78.75, 38.15], [79.0, 38.25], [79.53, 38.03], [79.68, 37.68], [80.0, 37.54], [80.5, 37.75], [81.03, 37.53], [81.18, 37.18], [81.25, 37.15], [81.32, 37.18], [81.47, 37.53], [82.0, 37.75], [82.53, 37.53], [82.75, 37.0], [82.53, 36.47], [82.18, 36.32], [82.03, 35.97], [81.5, 35.75], [81.25, 35.85], [81.0, 35.75], [80.47, 35.97], [80.32, 36.32], [80.0, 36.46], [79.5, 36.25], [79.25, 36.35], [79.0, 36.25], [78.47, 36.47], [78.32, 36.82], [78.25, 36.85], [78.0, 36.75], [77.75, 36.85], [77.5, 36.75], [77.25, 36.85], [77.0, 36.75], [76.75, 36.85], [76.5, 36.75], [75.97, 36.97], [75.82, 37.32], [75.47, 37.47], [75.25, 38.0], [75.38, 38.3], [74.97, 38.47], [74.82, 38.82], [74.75, 38.85], [74.5, 38.75], [73.97, 38.97]]]]}, "2021-01-09T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[73.97, 38.97], [73.75, 39.5], [73.97, 40.03], [74.5, 40.25], [74.75, 40.15], [74.82, 40.18], [74.97, 40.53], [75.5, 40.75], [75.75, 40.65], [76.0, 40.75], [76.25, 40.65], [76.32, 40.68], [76.47, 41.03], [77.0, 41.25], [77.25, 41.15], [77.5, 41.25], [77.75, 41.15], [78.0, 41.25], [78.25, 41.15], [78.32, 41.18], [78.47, 41.53], [79.0, 41.75], [79.53, 41.53], [79.75, 41.0], [79.53, 40.47], [79.18, 40.32], [79.15, 40.25], [79.25, 40.0], [79.03, 39.47], [78.5, 39.25], [78.25, 39.35], [78.0, 39.25], [77.75, 39.35], [77.68, 39.32], [77.65, 39.25], [77.75, 39.0], [77.65, 38.75], [77.75, 38.5], [77.65, 38.25], [77.7, 38.13], [78.0, 38.25], [78.53, 38.03], [78.75, 37.5], [78.53, 36.97], [78.0, 36.75], [77.47, 36.97], [77.3, 37.38], [77.18, 37.32], [77.03, 36.97], [76.5, 36.75], [75.97, 36.97], [75.82, 37.32], [75.47, 37.47], [75.25, 38.0], [75.38, 38.3], [74.97, 38.47], [74.82, 38.82], [74.75, 38.85], [74.5, 38.75], [73.97, 38.97]]]]}, "2021-01-10T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[73.97, 38.97], [73.75, 39.5], [73.97, 40.03], [74.5, 40.25], [74.75, 40.15], [74.82, 40.18], [74.97, 40.53], [75.5, 40.75], [75.75, 40.65], [76.0, 40.75], [76.25, 40.65], [76.32, 40.68], [76.47, 41.03], [77.0, 41.25], [77.25, 41.15], [77.5, 41.25], [77.75, 41.15], [78.0, 41.25], [78.25, 41.15], [78.32, 41.18], [78.47, 41.53], [79.0, 41.75], [79.53, 41.53], [79.75, 41.0], [79.53, 40.47], [79.18, 40.32], [79.15, 40.25], [79.25, 40.0], [79.03, 39.47], [78.5, 39.25], [78.25, 39.35], [78.0, 39.25], [77.75, 39.35], [77.68, 39.32], [77.65, 39.25], [77.75, 39.0], [77.65, 38.75], [77.75, 38.5], [77.65, 38.25], [77.7, 38.13], [78.0, 38.25], [78.53, 38.03], [78.75, 37.5], [78.53, 36.97], [78.0, 36.75], [77.47, 36.97], [77.3, 37.38], [77.0, 37.25], [76.75, 37.35], [76.5, 37.25], [76.25, 37.35], [76.0, 37.25], [75.47, 37.47], [75.25, 38.0], [75.38, 38.3], [74.97, 38.47], [74.82, 38.82], [74.75, 38.85], [74.5, 38.75], [73.97, 38.97]]]]}, "2021-01-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[74.25, 39.5], [74.47, 40.03], [75.0, 40.25], [75.25, 40.15], [75.32, 40.18], [75.47, 40.53], [76.0, 40.75], [76.5, 40.54], [76.82, 40.68], [76.97, 41.03], [77.5, 41.25], [78.03, 41.03], [78.18, 40.68], [78.53, 40.53], [78.75, 40.0], [78.53, 39.47], [78.0, 39.25], [77.75, 39.35], [77.68, 39.32], [77.65, 39.25], [77.75, 39.0], [77.65, 38.75], [77.75, 38.5], [77.65, 38.25], [77.7, 38.13], [78.0, 38.25], [78.53, 38.03], [78.75, 37.5], [78.53, 36.97], [78.0, 36.75], [77.47, 36.97], [77.3, 37.38], [77.0, 37.25], [76.75, 37.35], [76.5, 37.25], [76.25, 37.35], [76.0, 37.25], [75.47, 37.47], [75.25, 38.0], [75.38, 38.3], [74.97, 38.47], [74.82, 38.82], [74.47, 38.97], [74.25, 39.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -8.968922341924241}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.667659461843754}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-11.57299746922672, -11.693695445575543, -11.321846555196373, -13.141420147792076, -13.834033939039102, -14.625330455603319, -13.997900481338831, -12.609844869272536]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-13.178584851808125, -14.158600647939068, -13.984214977998874, -21.87425433982409, -22.65689006658326, -23.044972191120593, -23.692464187089087, -19.499979330258498]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.164801549229867, -5.5794893659079134, -5.18104142244195, -6.008630472249448, -5.905541893081049, -6.056003661245691, -5.527891880186283, -5.077937212345468]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.910264443380697, -7.525268289242433, -7.049897691967374, -8.762312871532174, -8.505734533674627, -8.968922341924241, -7.436710212148455, -7.325007087546339]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.411920782129913, -1.570185016137461, -1.480183600533183, -1.7335331425577536, -1.7407879970566247, -1.7853829075941856, -1.6634789175224702, -1.5821781345947208]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5995857404712321, -2.098042056327527, -1.9536235543565013, -2.4897625717220886, -2.437959567883181, -2.3571075491318596, -2.1791153347263927, -2.048688917234675]}}