{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:06:23.111613", "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-Jul-15_to_2025-Jul-19_284.0_58.0"}, "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": 2025070000658}, "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": "July 15 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "July 19 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": 63233.72534889619}, "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": 58.0}, "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": 284.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "284.0\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": 286.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 58.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 61.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-75.0, 57.25], [-75.25, 57.35], [-75.5, 57.25], [-75.75, 57.35], [-76.0, 57.25], [-76.25, 57.35], [-76.5, 57.25], [-76.75, 57.35], [-77.0, 57.25], [-77.53, 57.47], [-77.68, 57.82], [-78.03, 57.97], [-78.25, 58.5], [-78.03, 59.03], [-77.5, 59.25], [-77.25, 59.15], [-77.18, 59.18], [-77.15, 59.25], [-77.18, 59.32], [-77.53, 59.47], [-77.75, 60.0], [-77.65, 60.25], [-77.68, 60.32], [-78.03, 60.47], [-78.25, 61.0], [-78.03, 61.53], [-77.5, 61.75], [-77.25, 61.65], [-77.0, 61.75], [-76.47, 61.53], [-76.32, 61.18], [-76.25, 61.15], [-76.0, 61.25], [-75.75, 61.15], [-75.5, 61.25], [-74.97, 61.03], [-74.82, 60.68], [-74.75, 60.65], [-74.5, 60.75], [-73.97, 60.53], [-73.82, 60.18], [-73.75, 60.15], [-73.5, 60.25], [-72.97, 60.03], [-72.75, 59.5], [-72.85, 59.25], [-72.75, 59.0], [-72.97, 58.47], [-73.32, 58.32], [-73.47, 57.97], [-73.82, 57.82], [-73.97, 57.47], [-74.5, 57.25], [-74.75, 57.35], [-75.0, 57.25]]]]}}, "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": {"2025-07-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-78.02999999999997, 60.47], [-78.25, 61.0], [-78.02999999999997, 61.53], [-77.5, 61.75], [-77.25, 61.65], [-77.0, 61.75], [-76.47000000000003, 61.53], [-76.32, 61.18], [-76.25, 61.15], [-76.0, 61.25], [-75.75, 61.15], [-75.5, 61.25], [-74.97000000000003, 61.03], [-74.82, 60.68], [-74.75, 60.65], [-74.5, 60.75], [-73.97000000000003, 60.53], [-73.82, 60.18], [-73.75, 60.15], [-73.5, 60.25], [-72.97000000000003, 60.03], [-72.75, 59.5], [-72.85000000000002, 59.25], [-72.75, 59.0], [-72.97000000000003, 58.47], [-73.32, 58.32], [-73.47000000000003, 57.97], [-73.82, 57.82], [-73.97000000000003, 57.47], [-74.5, 57.25], [-74.75, 57.35], [-75.0, 57.25], [-75.25, 57.35], [-75.5, 57.25], [-75.75, 57.35], [-76.0, 57.25], [-76.52999999999997, 57.47], [-76.75, 58.0], [-76.64999999999998, 58.25], [-76.68, 58.32], [-77.02999999999997, 58.47], [-77.25, 59.0], [-77.14999999999998, 59.25], [-77.18, 59.32], [-77.52999999999997, 59.47], [-77.75, 60.0], [-77.64999999999998, 60.25], [-77.68, 60.32], [-78.02999999999997, 60.47]]]]}, "2025-07-16T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-78.02999999999997, 57.97], [-78.25, 58.5], [-78.02999999999997, 59.03], [-77.5, 59.25], [-77.25, 59.15], [-77.18, 59.18], [-77.14999999999998, 59.25], [-77.18, 59.32], [-77.52999999999997, 59.47], [-77.75, 60.0], [-77.64999999999998, 60.25], [-77.68, 60.32], [-78.02999999999997, 60.47], [-78.25, 61.0], [-78.02999999999997, 61.53], [-77.5, 61.75], [-77.25, 61.65], [-77.0, 61.75], [-76.47000000000003, 61.53], [-76.32, 61.18], [-76.25, 61.15], [-76.0, 61.25], [-75.75, 61.15], [-75.5, 61.25], [-74.97000000000003, 61.03], [-74.82, 60.68], [-74.75, 60.65], [-74.5, 60.75], [-73.97000000000003, 60.53], [-73.82, 60.18], [-73.75, 60.15], [-73.5, 60.25], [-72.97000000000003, 60.03], [-72.75, 59.5], [-72.85000000000002, 59.25], [-72.75, 59.0], 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t2m anomaly recorded over entire duration", "value": -6.6716812546974325}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.294654723277917}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [6.627535502115904, 6.840305582682333, 6.6851282755534385, 5.9396506415473596, 6.030720011393271]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [4.983883158365927, 4.968347167968773, 5.4005294799804915, 4.382478332519554, 5.503874715169275]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.570505982347654, -5.132885904049404, -5.057735032853249, -5.636428795822311, -5.440421627093009]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.278872233885863, -6.240956553352419, -6.022416661416344, -6.6716812546974325, -6.202924703217491]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5162527091826583, -1.394087254128681, -1.3889746261741256, -1.5406007795094085, -1.4983297280030436]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.7546596938058345, -1.5550392112221323, -1.6252943009662097, -1.7598852761115034, -1.6621279501703292]}}