{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:08:16.854141", "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-Oct-13_to_2025-Oct-16_238.5_44.5"}, "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": 2025100000414}, "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": "October 13 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "October 16 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": 68953.61827037336}, "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": ["United States"]}, "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": 44.5}, "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": 238.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "238.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 238.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 242.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 44.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 48.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-122.15, 45.25], [-122.25, 45.5], [-122.03, 46.03], [-121.68, 46.18], [-121.65, 46.25], [-121.75, 46.5], [-121.53, 47.03], [-121.18, 47.18], [-121.03, 47.53], [-120.5, 47.75], [-120.07, 47.57], [-120.25, 48.0], [-120.03, 48.53], [-119.5, 48.75], [-118.97, 48.53], [-118.82, 48.18], [-118.47, 48.03], [-118.32, 47.68], [-118.25, 47.65], [-118.0, 47.75], [-117.47, 47.53], [-117.25, 47.0], [-117.47, 46.47], [-117.82, 46.32], [-117.85, 46.25], [-117.75, 46.0], [-117.85, 45.75], [-117.75, 45.5], [-117.97, 44.97], [-118.5, 44.75], [-118.75, 44.85], [-119.0, 44.75], [-119.25, 44.85], [-119.32, 44.82], [-119.47, 44.47], [-120.0, 44.25], [-120.25, 44.35], [-120.32, 44.32], [-120.47, 43.97], [-120.82, 43.82], [-120.97, 43.47], [-121.5, 43.25], [-121.75, 43.35], [-122.0, 43.25], [-122.53, 43.47], [-122.75, 44.0], [-122.65, 44.25], [-122.75, 44.5], [-122.53, 45.03], [-122.18, 45.18], [-122.15, 45.25]], [[-119.8, 47.13], [-119.68, 47.18], [-119.65, 47.25], [-119.68, 47.32], [-119.93, 47.43], [-119.8, 47.13]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-10-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-122.75, 44.5], [-122.53, 45.03], [-122.18, 45.18], [-122.15, 45.25], [-122.25, 45.5], [-122.03, 46.03], [-121.68, 46.18], [-121.65, 46.25], [-121.75, 46.5], [-121.53, 47.03], [-121.18, 47.18], [-121.03, 47.53], [-120.5, 47.75], [-120.07, 47.57], [-120.25, 48.0], [-120.03, 48.53], [-119.5, 48.75], [-118.97, 48.53], [-118.75, 48.0], [-118.97, 47.47], [-119.5, 47.25], [-119.93, 47.43], [-119.75, 47.0], [-119.87, 46.7], [-119.47, 46.53], [-119.32, 46.18], [-118.97, 46.03], [-118.75, 45.5], [-118.97, 44.97], [-119.32, 44.82], [-119.47, 44.47], [-120.0, 44.25], [-120.25, 44.35], [-120.5, 44.25], [-120.75, 44.35], [-120.82, 44.32], [-120.85, 44.25], [-120.75, 44.0], [-120.97, 43.47], [-121.5, 43.25], [-121.75, 43.35], [-122.0, 43.25], [-122.53, 43.47], [-122.75, 44.0], [-122.65, 44.25], [-122.75, 44.5]]]]}, "2025-10-14T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-122.75, 44.5], [-122.53, 45.03], [-122.18, 45.18], [-122.15, 45.25], [-122.25, 45.5], [-122.03, 46.03], [-121.68, 46.18], [-121.65, 46.25], [-121.75, 46.5], [-121.53, 47.03], [-121.18, 47.18], [-121.03, 47.53], [-120.5, 47.75], [-120.07, 47.57], [-120.25, 48.0], [-120.03, 48.53], [-119.5, 48.75], [-118.97, 48.53], [-118.82, 48.18], [-118.47, 48.03], [-118.32, 47.68], [-118.25, 47.65], [-118.0, 47.75], [-117.47, 47.53], [-117.25, 47.0], [-117.47, 46.47], [-117.82, 46.32], [-117.85, 46.25], [-117.75, 46.0], [-117.85, 45.75], [-117.75, 45.5], [-117.97, 44.97], [-118.5, 44.75], [-118.75, 44.85], [-119.0, 44.75], [-119.25, 44.85], [-119.32, 44.82], [-119.47, 44.47], [-120.0, 44.25], [-120.25, 44.35], [-120.32, 44.32], [-120.47, 43.97], [-120.82, 43.82], [-120.97, 43.47], [-121.5, 43.25], [-121.75, 43.35], [-122.0, 43.25], [-122.53, 43.47], [-122.75, 44.0], [-122.65, 44.25], [-122.75, 44.5]], [[-119.68, 47.18], [-119.65, 47.25], [-119.68, 47.32], [-119.93, 47.43], [-119.80000000000001, 47.13], [-119.68, 47.18]]]]}, "2025-10-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-122.75, 44.5], [-122.53, 45.03], [-122.18, 45.18], [-122.15, 45.25], [-122.25, 45.5], [-122.03, 46.03], [-121.68, 46.18], [-121.65, 46.25], [-121.75, 46.5], [-121.53, 47.03], [-121.18, 47.18], [-121.03, 47.53], [-120.5, 47.75], [-120.07, 47.57], [-120.25, 48.0], [-120.03, 48.53], [-119.5, 48.75], [-118.97, 48.53], [-118.82, 48.18], [-118.47, 48.03], [-118.32, 47.68], [-118.25, 47.65], [-118.0, 47.75], [-117.47, 47.53], [-117.25, 47.0], [-117.47, 46.47], [-117.82, 46.32], [-117.85, 46.25], [-117.75, 46.0], [-117.85, 45.75], [-117.75, 45.5], [-117.97, 44.97], [-118.5, 44.75], [-118.75, 44.85], [-119.0, 44.75], [-119.25, 44.85], [-119.32, 44.82], [-119.47, 44.47], [-120.0, 44.25], [-120.25, 44.35], [-120.32, 44.32], [-120.47, 43.97], [-120.82, 43.82], [-120.97, 43.47], [-121.5, 43.25], [-121.75, 43.35], [-122.0, 43.25], [-122.53, 43.47], [-122.75, 44.0], [-122.65, 44.25], [-122.75, 44.5]], [[-119.68, 47.18], [-119.65, 47.25], [-119.68, 47.32], [-119.93, 47.43], [-119.80000000000001, 47.13], [-119.68, 47.18]]]]}, "2025-10-16T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-121.5, 43.75], [-122.03, 43.97], [-122.25, 44.5], [-122.03, 45.03], [-121.5, 45.25], [-121.25, 45.15], [-121.0, 45.25], [-120.57, 45.07], [-120.75, 45.5], [-120.65, 45.75], [-120.75, 46.0], [-120.53, 46.53], [-120.18, 46.68], [-120.03, 47.03], [-119.68, 47.18], [-119.65, 47.25], [-119.75, 47.5], [-119.53, 48.03], [-119.0, 48.25], [-118.47, 48.03], [-118.32, 47.68], [-118.25, 47.65], [-118.0, 47.75], [-117.47, 47.53], [-117.25, 47.0], [-117.47, 46.47], [-117.82, 46.32], [-117.85, 46.25], [-117.75, 46.0], [-117.85, 45.75], [-117.75, 45.5], [-117.97, 44.97], [-118.5, 44.75], [-118.75, 44.85], [-119.0, 44.75], [-119.25, 44.85], [-119.5, 44.75], [-119.75, 44.85], [-120.0, 44.75], [-120.43, 44.93], [-120.25, 44.5], [-120.47, 43.97], [-121.0, 43.75], [-121.25, 43.85], [-121.5, 43.75]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -6.420264603212388}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.716313456430991}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [5.0918589006390675, 5.57011439005538, 5.529133097330771, 7.461697851442864]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [1.9112462361653684, 1.1893923441569427, 1.918422953287802, 4.2627184549967865]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.716140596531967, -4.878821279199151, -4.877424657263367, -4.107341431893597]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.808494199128802, -6.420264603212388, -5.889569032957809, -4.682191111940426]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5091088427815627, -1.6098456617956205, -1.6749164816541824, -1.4594320157066638]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.676694648201168, -2.029023077243329, -1.98244089227258, -1.6740358638087696]}}