{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:09:09.851385", "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-Dec-06_to_2025-Dec-09_299.5_51.0"}, "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": 2025120000300}, "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": "December 06 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 09 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 4}, "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": 62474.06695073116}, "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": 51.0}, "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": 299.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "299.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 299.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 303.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 51.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 54.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-61.03, 50.47], [-61.25, 51.0], [-61.15, 51.25], [-61.25, 51.5], [-61.03, 52.03], [-60.5, 52.25], [-60.25, 52.15], [-60.18, 52.18], [-60.15, 52.25], [-60.25, 52.5], [-60.15, 52.75], [-60.18, 52.82], [-60.53, 52.97], [-60.75, 53.5], [-60.65, 53.75], [-60.75, 54.0], [-60.53, 54.53], [-60.0, 54.75], [-59.75, 54.65], [-59.5, 54.75], [-58.97, 54.53], [-58.8, 54.12], [-58.5, 54.25], [-58.0, 54.04], [-57.5, 54.25], [-56.97, 54.03], [-56.75, 53.5], [-56.85, 53.25], [-56.75, 53.0], [-56.85, 52.75], [-56.82, 52.68], [-56.47, 52.53], [-56.25, 52.0], [-56.47, 51.47], [-56.82, 51.32], [-56.97, 50.97], [-57.5, 50.75], [-57.75, 50.85], [-57.82, 50.82], [-57.97, 50.47], [-58.5, 50.25], [-58.75, 50.35], [-59.0, 50.25], [-59.25, 50.35], [-59.5, 50.25], [-59.75, 50.35], [-60.0, 50.25], [-60.25, 50.35], [-60.5, 50.25], [-61.03, 50.47]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.E.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-12-06T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-61.02999999999997, 51.53], [-60.5, 51.75], [-59.97000000000003, 51.53], [-59.75, 51.0], [-59.97000000000003, 50.47], [-60.5, 50.25], [-61.02999999999997, 50.47], [-61.25, 51.0], [-61.02999999999997, 51.53]]]]}, "2025-12-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-61.25, 51.5], [-61.02999999999997, 52.03], [-60.5, 52.25], [-60.25, 52.15], [-60.18000000000001, 52.18], [-60.14999999999998, 52.25], [-60.25, 52.5], [-60.14999999999998, 52.75], [-60.18000000000001, 52.82], [-60.52999999999997, 52.97], [-60.75, 53.5], [-60.64999999999998, 53.75], [-60.75, 54.0], [-60.52999999999997, 54.53], [-60.0, 54.75], [-59.75, 54.65], [-59.5, 54.75], [-58.97000000000003, 54.53], [-58.80000000000001, 54.12], [-58.5, 54.25], [-58.0, 54.04], [-57.5, 54.25], [-56.97000000000003, 54.03], [-56.75, 53.5], [-56.85000000000002, 53.25], [-56.75, 53.0], [-56.85000000000002, 52.75], [-56.81999999999999, 52.68], [-56.47000000000003, 52.53], [-56.25, 52.0], [-56.47000000000003, 51.47], [-56.81999999999999, 51.32], [-56.97000000000003, 50.97], [-57.5, 50.75], [-57.75, 50.85], [-57.81999999999999, 50.82], [-57.97000000000003, 50.47], [-58.5, 50.25], [-58.75, 50.35], [-59.0, 50.25], [-59.25, 50.35], [-59.5, 50.25], [-59.75, 50.35], [-60.0, 50.25], [-60.25, 50.35], [-60.5, 50.25], [-61.02999999999997, 50.47], [-61.25, 51.0], [-61.14999999999998, 51.25], [-61.25, 51.5]]]]}, "2025-12-08T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-61.25, 51.5], [-61.02999999999997, 52.03], [-60.5, 52.25], [-60.25, 52.15], [-60.18000000000001, 52.18], [-60.14999999999998, 52.25], [-60.25, 52.5], [-60.14999999999998, 52.75], [-60.18000000000001, 52.82], [-60.52999999999997, 52.97], [-60.75, 53.5], [-60.64999999999998, 53.75], [-60.75, 54.0], [-60.52999999999997, 54.53], [-60.0, 54.75], [-59.75, 54.65], [-59.5, 54.75], [-58.97000000000003, 54.53], [-58.80000000000001, 54.12], [-58.5, 54.25], [-58.0, 54.04], [-57.5, 54.25], [-56.97000000000003, 54.03], [-56.75, 53.5], [-56.85000000000002, 53.25], [-56.75, 53.0], [-56.85000000000002, 52.75], [-56.81999999999999, 52.68], [-56.47000000000003, 52.53], [-56.25, 52.0], [-56.47000000000003, 51.47], [-56.81999999999999, 51.32], [-56.97000000000003, 50.97], [-57.5, 50.75], [-57.75, 50.85], [-57.81999999999999, 50.82], [-57.97000000000003, 50.47], [-58.5, 50.25], [-58.75, 50.35], [-59.0, 50.25], [-59.25, 50.35], [-59.5, 50.25], [-59.75, 50.35], [-60.0, 50.25], [-60.25, 50.35], [-60.5, 50.25], [-61.02999999999997, 50.47], [-61.25, 51.0], [-61.14999999999998, 51.25], [-61.25, 51.5]]]]}, "2025-12-09T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-61.25, 51.5], [-61.02999999999997, 52.03], [-60.5, 52.25], [-60.25, 52.15], [-60.18000000000001, 52.18], [-60.14999999999998, 52.25], [-60.25, 52.5], [-60.14999999999998, 52.75], [-60.18000000000001, 52.82], [-60.52999999999997, 52.97], [-60.75, 53.5], [-60.64999999999998, 53.75], 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amplitude", "description": "Mean t2m anomaly over entire duration", "value": -8.823916325795148}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-16.668640518188454, -17.511613071326025, -18.037525635536298, -19.570613529706236]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-16.668640518188454, -20.215807978312142, -20.2000933329264, -22.29083162943519]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-8.310321306750723, -8.334027785247278, -8.4451653921271, -9.708119285436654]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-8.310321306750723, -9.957998648481663, -9.520870762725309, -12.108731979875785]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.422784098874072, -1.4642430017347297, -1.5006632155034867, -1.662015114250207]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.422784098874072, -1.687593042220051, -1.6526198568400259, -1.9486195373214517]}}