{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:06:54.340969", "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-12_to_2025-Aug-19_284.5_62.0"}, "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": 2025080000476}, "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 12 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 19 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 8}, "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": 76162.98492472085}, "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"]}, "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": 62.0}, "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": 284.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "284.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 282.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 288.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 60.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 62.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-77.5, 62.75], [-77.25, 62.65], [-77.0, 62.75], [-76.75, 62.65], [-76.5, 62.75], [-76.25, 62.65], [-76.0, 62.75], 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"polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-08-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-76.0, 61.25], [-76.52999999999997, 61.47], [-76.75, 62.0], [-76.52999999999997, 62.53], [-76.0, 62.75], [-75.75, 62.65], [-75.5, 62.75], [-74.97000000000003, 62.53], [-74.75, 62.0], [-74.97000000000003, 61.47], [-75.5, 61.25], [-75.75, 61.35], [-76.0, 61.25]]]]}, "2025-08-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-77.02999999999997, 62.03], [-76.68, 62.18], [-76.52999999999997, 62.53], [-76.0, 62.75], [-75.75, 62.65], [-75.5, 62.75], [-74.97000000000003, 62.53], [-74.82, 62.18], [-74.75, 62.15], [-74.5, 62.25], [-74.25, 62.15], [-74.0, 62.25], [-73.75, 62.15], [-73.5, 62.25], [-73.25, 62.15], [-73.0, 62.25], [-72.47000000000003, 62.03], [-72.32, 61.68], [-71.97000000000003, 61.53], [-71.75, 61.0], [-71.97000000000003, 60.47], [-72.5, 60.25], [-72.75, 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"max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -6.043706129020734}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.023337885595134}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [5.104258473714253, 5.048448689778638, 5.738260795956592, 5.924656578802342, 5.064639213996202, 4.079326534894619, 4.65683435178272, 5.148785897188418]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [4.915863291422568, 3.433918253580771, 3.5740587870280365, 4.467449442545615, 2.9600934346516965, 1.3677459716797102, 2.1317357381184934, 3.101307169596396]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.9046708060120636, -4.11710233772628, 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