{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:07:00.933071", "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-23_to_2025-Aug-25_256.5_48.0"}, "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": 2025080000794}, "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 23 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 25 2025"}, "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": 108403.26532022136}, "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": ["Canada", "United States"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["America", "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": 48.0}, "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": 256.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "256.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 255.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 262.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 46.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 49.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-104.53, 49.03], [-104.0, 49.25], [-103.75, 49.15], [-103.5, 49.25], [-102.97, 49.03], [-102.82, 48.68], [-102.7, 48.62], [-102.65, 48.75], [-102.75, 49.0], [-102.53, 49.53], [-102.0, 49.75], [-101.75, 49.65], [-101.5, 49.75], [-101.25, 49.65], [-101.0, 49.75], [-100.75, 49.65], [-100.5, 49.75], [-99.97, 49.53], [-99.82, 49.18], [-99.47, 49.03], [-99.32, 48.68], [-99.25, 48.65], [-99.0, 48.75], [-98.47, 48.53], [-98.25, 48.0], [-98.35, 47.75], [-98.32, 47.68], [-98.25, 47.65], [-98.0, 47.75], [-97.47, 47.53], [-97.25, 47.0], [-97.47, 46.47], [-98.0, 46.25], [-98.25, 46.35], [-98.5, 46.25], [-98.75, 46.35], [-98.82, 46.32], [-98.97, 45.97], [-99.5, 45.75], [-99.75, 45.85], [-100.0, 45.75], [-100.25, 45.85], [-100.32, 45.82], [-100.47, 45.47], [-101.0, 45.25], [-101.53, 45.47], [-101.68, 45.82], [-101.75, 45.85], [-102.0, 45.75], [-102.53, 45.97], [-102.68, 46.32], [-102.75, 46.35], [-103.0, 46.25], [-103.25, 46.35], [-103.5, 46.25], [-104.03, 46.47], [-104.18, 46.82], [-104.25, 46.85], [-104.5, 46.75], [-105.03, 46.97], [-105.25, 47.5], [-105.03, 48.03], [-104.68, 48.18], [-104.65, 48.25], [-104.75, 48.5], [-104.53, 49.03]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.North-America", "C.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-08-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-104.65, 48.25], [-104.75, 48.5], [-104.53, 49.03], [-104.0, 49.25], [-103.75, 49.15], [-103.5, 49.25], [-102.97000000000003, 49.03], [-102.82, 48.68], [-102.69999999999999, 48.62], [-102.64999999999998, 48.75], [-102.75, 49.0], [-102.52999999999997, 49.53], [-102.0, 49.75], [-101.75, 49.65], [-101.5, 49.75], [-101.25, 49.65], [-101.0, 49.75], [-100.75, 49.65], [-100.5, 49.75], [-99.97000000000003, 49.53], [-99.82, 49.18], [-99.47000000000003, 49.03], [-99.32, 48.68], [-99.25, 48.65], [-99.0, 48.75], [-98.47000000000003, 48.53], [-98.25, 48.0], [-98.35000000000002, 47.75], [-98.32, 47.68], [-98.25, 47.65], [-98.0, 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"description": "The daily evolution of maximum t2m.", "value": [13.23273620605471, 11.94230422973635, 13.056762949625693]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.9357187760949, -6.386361354204585, -5.741170542786126]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.254309226902194, -7.452757592988803, -6.883855614752974]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4662002769555373, -1.8816504578149584, -1.6444289022567833]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.7606161061057732, -2.0499743562310333, -2.0203319044114805]}}