{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:56:55.541640", "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": "2024-Jan-04_to_2024-Jan-12_240.5_37.5"}, "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": 2024010000163}, "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 2024"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 12 2024"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 9}, "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": 54102.62345104199}, "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": 37.5}, "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": 240.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "240.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 239.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 242.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 35.0}, "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": [[[[-119.25, 35.5], [-119.15, 35.75], [-119.18, 35.82], [-119.53, 35.97], [-119.68, 36.32], [-120.03, 36.47], [-120.18, 36.82], [-120.53, 36.97], [-120.68, 37.32], [-121.03, 37.47], [-121.25, 38.0], [-121.15, 38.25], [-121.25, 38.5], [-121.04, 39.0], [-121.25, 39.5], [-121.03, 40.03], [-120.5, 40.25], [-119.97, 40.03], [-119.82, 39.68], [-119.47, 39.53], [-119.32, 39.18], [-118.97, 39.03], [-118.82, 38.68], [-118.47, 38.53], [-118.25, 38.0], [-118.35, 37.75], [-118.32, 37.68], [-117.97, 37.53], [-117.75, 37.0], [-117.85, 36.75], [-117.75, 36.5], [-117.85, 36.25], [-117.82, 36.18], [-117.75, 36.15], [-117.5, 36.25], [-116.97, 36.03], [-116.75, 35.5], [-116.97, 34.97], [-117.32, 34.82], [-117.47, 34.47], [-118.0, 34.25], [-118.53, 34.47], [-118.68, 34.82], [-119.03, 34.97], [-119.25, 35.5]]]]}}, "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": {"2024-01-04T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-120.03, 38.03], [-119.5, 38.25], [-118.97, 38.03], [-118.75, 37.5], [-118.97, 36.97], [-119.5, 36.75], [-120.03, 36.97], [-120.25, 37.5], [-120.03, 38.03]]]]}, "2024-01-05T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-120.03, 38.03], [-119.5, 38.25], [-118.97, 38.03], [-118.75, 37.5], [-118.97, 36.97], [-119.5, 36.75], [-120.03, 36.97], [-120.25, 37.5], [-120.03, 38.03]]]]}, "2024-01-06T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-121.03, 38.97], [-121.25, 39.5], [-121.03, 40.03], [-120.5, 40.25], [-119.97, 40.03], [-119.82, 39.68], [-119.47, 39.53], [-119.32, 39.18], [-118.97, 39.03], [-118.82, 38.68], [-118.47, 38.53], [-118.25, 38.0], [-118.35, 37.75], [-118.32, 37.68], [-117.97, 37.53], [-117.75, 37.0], [-117.85, 36.75], [-117.75, 36.5], [-117.97, 35.97], [-118.5, 35.75], [-119.03, 35.97], [-119.18, 36.32], [-119.25, 36.35], [-119.5, 36.25], [-120.03, 36.47], [-120.25, 37.0], [-120.15, 37.25], [-120.18, 37.32], [-120.53, 37.47], [-120.75, 38.0], [-120.65, 38.25], [-120.75, 38.5], [-120.65, 38.75], [-120.68, 38.82], [-121.03, 38.97]]]]}, "2024-01-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-121.25, 38.5], [-121.03999999999999, 39.0], [-121.25, 39.5], [-121.03, 40.03], [-120.5, 40.25], [-119.97, 40.03], [-119.82, 39.68], [-119.47, 39.53], [-119.32, 39.18], [-118.97, 39.03], [-118.82, 38.68], [-118.47, 38.53], [-118.25, 38.0], [-118.35, 37.75], [-118.32, 37.68], [-117.97, 37.53], [-117.75, 37.0], [-117.85, 36.75], [-117.75, 36.5], [-117.97, 35.97], [-118.5, 35.75], [-118.75, 35.85], [-119.0, 35.75], [-119.53, 35.97], [-119.68, 36.32], [-120.03, 36.47], [-120.18, 36.82], [-120.53, 36.97], [-120.68, 37.32], [-121.03, 37.47], [-121.25, 38.0], [-121.15, 38.25], [-121.25, 38.5]]]]}, "2024-01-08T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-121.25, 38.5], [-121.03999999999999, 39.0], [-121.25, 39.5], [-121.03, 40.03], [-120.5, 40.25], [-119.97, 40.03], [-119.82, 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