{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:07:02.842900", "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-Aug-26_to_2025-Aug-30_246.5_37.0"}, "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": 2025080000870}, "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": "August 26 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 30 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 5}, "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": 128613.07717913018}, "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": ["United States"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["America"]}, "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": 37.0}, "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": 246.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "246.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 240.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 246.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 36.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 39.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-112.97, 36.47], [-113.32, 36.32], [-113.35, 36.25], [-113.25, 36.0], [-113.47, 35.47], [-114.0, 35.25], [-114.25, 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40.03], [-113.25, 39.5], [-113.35, 39.25], [-113.32, 39.18], [-112.97, 39.03], [-112.75, 38.5], [-112.85, 38.25], [-112.75, 38.0], [-112.85, 37.75], [-112.75, 37.5], [-112.85, 37.25], [-112.75, 37.0], [-112.97, 36.47]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-08-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-120.25, 39.0], [-120.03, 39.53], [-119.5, 39.75], [-119.25, 39.65], [-119.0, 39.75], [-118.75, 39.65], [-118.68, 39.68], [-118.53, 40.03], [-118.0, 40.25], [-117.75, 40.15], [-117.5, 40.25], [-117.25, 40.15], [-117.0, 40.25], [-116.5, 40.04], [-116.0, 40.25], [-115.75, 40.15], [-115.5, 40.25], [-115.25, 40.15], [-115.0, 40.25], [-114.75, 40.15], [-114.5, 40.25], [-113.97, 40.03], [-113.75, 39.5], [-113.96000000000001, 39.0], [-113.82, 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"value": [19.602893078234786, 18.063724724151825, 18.720301036714773, 20.154131135486466, 17.985922386532764]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [13.311667378743493, 12.84009958902999, 12.121996815999353, 15.588517761230491, 16.155135091145837]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.212360041710707, -5.543680401326169, -4.78095794817974, -4.058675038047137, -4.135779303372731]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.091648650956756, -6.96198555636829, -6.205236917939601, -5.770581218363986, -4.291689202493217]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.6958886170710643, 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