{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:04:20.154694", "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-Apr-02_to_2025-Apr-06_253.5_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": 2025040000138}, "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": "April 02 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 06 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": 104923.039250498}, "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": 253.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "253.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 251.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 255.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 37.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 41.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-104.35, 39.25], [-104.25, 39.0], [-104.47, 38.47], [-105.0, 38.25], [-105.25, 38.35], [-105.32, 38.32], [-105.47, 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"value": ["W.North-America", "C.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-04-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-108.75, 38.0], [-108.53, 38.53], [-108.18, 38.68], [-108.15, 38.75], [-108.25, 39.0], [-108.15, 39.25], [-108.18, 39.32], [-108.25, 39.35], [-108.5, 39.25], [-109.03, 39.47], [-109.25, 40.0], [-109.03, 40.53], [-108.5, 40.75], [-108.25, 40.65], [-108.18, 40.68], [-108.03, 41.03], [-107.68, 41.18], [-107.53, 41.53], [-107.18, 41.68], [-107.03, 42.03], [-106.5, 42.25], [-105.97, 42.03], [-105.75, 41.5], [-105.85, 41.25], [-105.82, 41.18], [-105.47, 41.03], [-105.25, 40.5], [-105.35, 40.25], [-105.25, 40.0], [-105.35, 39.75], [-105.25, 39.5], [-105.47, 38.97], [-105.82, 38.82], [-105.85, 38.75], [-105.75, 38.5], [-105.96000000000001, 38.0], [-105.75, 37.5], [-105.85, 37.25], [-105.75, 37.0], [-105.97, 36.47], [-106.5, 36.25], [-107.03, 36.47], [-107.18, 36.82], [-107.25, 36.85], [-107.5, 36.75], [-107.75, 36.85], [-108.0, 36.75], [-108.53, 36.97], [-108.75, 37.5], [-108.65, 37.75], [-108.75, 38.0]]]]}, "2025-04-03T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-108.75, 38.0], [-108.53, 38.53], [-108.18, 38.68], [-108.15, 38.75], [-108.25, 39.0], [-108.15, 39.25], [-108.18, 39.32], [-108.25, 39.35], [-108.5, 39.25], [-109.03, 39.47], [-109.25, 40.0], [-109.03, 40.53], [-108.5, 40.75], [-108.25, 40.65], [-108.18, 40.68], [-108.03999999999999, 41.0], [-108.25, 41.5], [-108.03, 42.03], [-107.5, 42.25], [-107.25, 42.15], [-107.0, 42.25], [-106.75, 42.15], [-106.5, 42.25], [-106.25, 42.15], [-106.0, 42.25], [-105.47, 42.03], [-105.25, 41.5], [-105.35, 41.25], [-105.32, 41.18], [-105.25, 41.15], [-105.0, 41.25], [-104.47, 41.03], [-104.25, 40.5], [-104.47, 39.97], [-104.82, 39.82], [-104.85, 39.75], [-104.75, 39.5], [-104.97, 38.97], [-105.5, 38.75], [-105.75, 38.85], [-105.82, 38.82], [-105.85, 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-6.5868207526929154, -6.104111776044249, -5.503900909423805]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-11.305148824055948, -10.52848409016923, -11.21702168782548, -10.04262771606443, -7.43763707478837]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-6.853396985097955, -6.15038818465392, -6.371562347110703, -6.248952330227872, -5.860802107014564]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-9.053519317148414, -8.15214735040496, -7.573649118110893, -8.186022343729803, -7.052296300097225]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-2.060222508261143, -1.7882480545376522, -1.8446408264197793, -1.7162482277869144, -1.6589596311313153]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.672118461018095, -2.250495733558127, -2.419087298038897, -2.1402414260692124, -2.041225381625435]}}