{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:10:47.327817", "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-Mar-17_to_2026-Mar-19_274.5_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": 2026030000527}, "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 17 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "March 19 2026"}, "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": 125252.83836504133}, "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": 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": 274.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "274.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 272.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 279.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 27.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 32.75}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-86.75, 31.65], [-86.5, 31.75], [-86.0, 31.54], [-85.5, 31.75], [-85.25, 31.65], [-85.18, 31.68], [-85.03, 32.03], 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[-88.03, 29.97], [-88.25, 30.5], [-88.03, 31.03], [-87.68, 31.18], [-87.53, 31.53], [-87.0, 31.75], [-86.75, 31.65]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-03-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-87.52999999999997, 31.53], [-87.0, 31.75], [-86.75, 31.65], [-86.5, 31.75], [-86.0, 31.54], [-85.5, 31.75], [-85.25, 31.65], [-85.18, 31.68], [-85.02999999999997, 32.03], [-84.5, 32.25], [-84.25, 32.15], [-84.18, 32.18], [-84.02999999999997, 32.53], [-83.5, 32.75], [-83.25, 32.65], [-83.0, 32.75], [-82.47000000000003, 32.53], [-82.32, 32.18], [-82.25, 32.15], [-82.18, 32.18], [-82.14999999999998, 32.25], [-82.25, 32.5], [-82.02999999999997, 33.03], [-81.5, 33.25], [-80.97000000000003, 33.03], [-80.75, 32.5], [-80.85000000000002, 32.25], 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31.53]]]]}, "2026-03-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-87.52999999999997, 31.53], [-87.0, 31.75], [-86.75, 31.65], [-86.5, 31.75], [-86.0, 31.54], [-85.5, 31.75], [-85.25, 31.65], [-85.18, 31.68], [-85.02999999999997, 32.03], [-84.5, 32.25], [-84.25, 32.15], [-84.18, 32.18], [-84.02999999999997, 32.53], [-83.5, 32.75], [-83.25, 32.65], [-83.0, 32.75], [-82.47000000000003, 32.53], [-82.32, 32.18], [-82.25, 32.15], [-82.18, 32.18], [-82.14999999999998, 32.25], [-82.25, 32.5], [-82.02999999999997, 33.03], [-81.5, 33.25], [-80.97000000000003, 33.03], [-80.75, 32.5], [-80.85000000000002, 32.25], [-80.75, 32.0], [-80.95999999999998, 31.5], [-80.75, 31.0], [-80.85000000000002, 30.75], [-80.75, 30.5], [-80.85000000000002, 30.25], [-80.75, 30.0], [-80.85000000000002, 29.75], [-80.75, 29.5], [-80.85000000000002, 29.25], [-80.82, 29.18], [-80.47000000000003, 29.03], [-80.25, 28.5], [-80.47000000000003, 27.97], [-80.82, 27.82], [-80.97000000000003, 27.47], 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"The daily evolution of mean t2m anomalies.", "value": [-8.904722861297943, -8.524675054312922, -5.671196068216615]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-10.52870337893637, -9.802800371200078, -6.597301186596894]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-2.3106813320392012, -2.3056936359192233, -1.549557728655655]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.85992160656694, -2.664668322521587, -1.7489203678286325]}}