{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:06:26.828826", "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-25_to_2025-Jul-28_238.0_57.0"}, "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": 2025070000956}, "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 25 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "July 28 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": 97032.95238680326}, "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": 57.0}, "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": 238.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "238.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 236.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 246.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 54.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 58.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-118.5, 56.75], [-118.25, 56.65], [-118.0, 56.75], [-117.75, 56.65], [-117.5, 56.75], [-116.97, 56.53], [-116.8, 56.13], 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56.32], [-123.25, 56.35], [-123.5, 56.25], [-124.03, 56.47], [-124.25, 57.0], [-124.15, 57.25], [-124.25, 57.5], [-124.03, 58.03], [-123.5, 58.25], [-122.97, 58.03], [-122.82, 57.68], [-122.5, 57.54], [-122.0, 57.75], [-121.75, 57.65], [-121.5, 57.75], [-121.25, 57.65], [-121.18, 57.68], [-121.15, 57.75], [-121.25, 58.0], [-121.03, 58.53], [-120.5, 58.75], [-119.97, 58.53], [-119.75, 58.0], [-119.85, 57.75], [-119.82, 57.68], [-119.75, 57.65], [-119.5, 57.75], [-118.97, 57.53], [-118.75, 57.0], [-118.85, 56.75], [-118.82, 56.68], [-118.75, 56.65], [-118.5, 56.75]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.W.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-07-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-124.25, 57.5], [-124.03, 58.03], [-123.5, 58.25], [-122.97, 58.03], [-122.82, 57.68], 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t2m anomaly recorded over entire duration", "value": -5.367889995771975}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.8510988258578527}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [11.663296169704893, 12.660193561372296, 12.333198983328714, 12.546362813313806]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [7.476485188802087, 8.143743133544945, 7.580562845865927, 10.719588216145837]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.19774095597759, -3.578424169455026, -3.841974605835038, -4.019269862615486]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.3143782509536095, -4.580055316577955, -4.758197257389554, -5.367889995771975]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.6111251152057293, -1.3600282310246068, -1.4116056555649066, -1.4797467691148785]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.0103225053422533, -1.729050224129037, -1.7739160594715209, -2.0102426731009158]}}