{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:08:47.861934", "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-Nov-17_to_2025-Nov-20_109.0_31.5"}, "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": 2025110000478}, "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": "November 17 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "November 20 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": 107578.89060369866}, "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"]}, "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": 31.5}, "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": 109.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "109.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 105.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 110.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 30.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 34.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[110.03, 29.97], [109.5, 29.75], [109.25, 29.85], [109.0, 29.75], [108.75, 29.85], [108.5, 29.75], [108.25, 29.85], [108.0, 29.75], [107.75, 29.85], [107.5, 29.75], [107.25, 29.85], [107.18, 29.82], [107.03, 29.47], [106.5, 29.25], [106.25, 29.35], [106.0, 29.25], [105.47, 29.47], [105.25, 30.0], [105.35, 30.25], [105.25, 30.5], [105.47, 31.03], [105.82, 31.18], [105.97, 31.53], [106.32, 31.68], [106.35, 31.75], [106.25, 32.0], [106.38, 32.3], [106.25, 32.35], [106.0, 32.25], [105.75, 32.35], [105.5, 32.25], [104.97, 32.47], [104.75, 33.0], [104.85, 33.25], [104.75, 33.5], [104.85, 33.75], [104.75, 34.0], [104.97, 34.53], [105.5, 34.75], [105.75, 34.65], [106.0, 34.75], [106.5, 34.54], [107.0, 34.75], [107.53, 34.53], [107.68, 34.18], [107.75, 34.15], [108.0, 34.25], [108.25, 34.15], [108.5, 34.25], [109.03, 34.03], [109.25, 33.5], [109.15, 33.25], [109.25, 33.0], [109.13, 32.7], [109.53, 32.53], [109.7, 32.13], [110.0, 32.25], [110.53, 32.03], [110.75, 31.5], [110.53, 30.97], [110.18, 30.82], [110.15, 30.75], [110.25, 30.5], [110.03, 29.97]], [[108.38, 32.3], [108.2, 32.38], [108.13, 32.2], [108.25, 32.15], [108.32, 32.18], [108.38, 32.3]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Asia"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-11-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[104.75, 33.5], [104.85, 33.75], [104.75, 34.0], [104.97, 34.53], [105.5, 34.75], [105.75, 34.65], [106.0, 34.75], [106.5, 34.54], [107.0, 34.75], [107.53, 34.53], [107.68, 34.18], [107.75, 34.15], [108.0, 34.25], [108.25, 34.15], [108.5, 34.25], [109.03, 34.03], [109.25, 33.5], [109.15, 33.25], [109.25, 33.0], [109.13, 32.7], [109.53, 32.53], [109.7, 32.13], [110.0, 32.25], [110.53, 32.03], [110.75, 31.5], [110.53, 30.97], [110.18, 30.82], [110.15, 30.75], [110.25, 30.5], [110.03, 29.97], [109.5, 29.75], [108.97, 29.97], [108.82, 30.32], [108.75, 30.35], [108.68, 30.32], [108.53, 29.97], [108.0, 29.75], [107.75, 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32.18], [108.38, 32.3]]]]}, "2025-11-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[107.75, 31.0], [107.85, 31.25], [107.75, 31.5], [107.97, 32.03], [108.5, 32.25], [108.75, 32.15], [109.0, 32.25], [109.53, 32.03], [109.75, 31.5], [109.63, 31.2], [110.03, 31.03], [110.25, 30.5], [110.03, 29.97], [109.5, 29.75], [109.25, 29.85], [109.0, 29.75], [108.75, 29.85], [108.5, 29.75], [107.97, 29.97], [107.75, 30.5], [107.85, 30.75], [107.75, 31.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -10.403885802707691}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.958531979816172}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [4.116004024407857, 2.5729384445562573, 4.45497687114937, 5.274708896213156]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-6.3039929707844635, -7.808016204833962, -2.280315144856729, 0.9350957234700559]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.849533700231652, -6.156850353705196, -4.065110427743897, -3.583559181367813]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-9.151453704033145, -10.403885802707691, -6.206528641501109, -5.186329806062531]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.7997687297168785, -2.21102352707274, -1.4588865490752063, -1.3402319920547325]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.6526363982767807, -3.174715256412501, -2.0462019676639422, -1.7578263254295472]}}