{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:06:20.981875", "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-12_to_2025-Jul-15_260.0_31.5"}, "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": 2025070000566}, "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 12 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "July 15 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": 94982.66592317489}, "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": 31.5}, "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": 260.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "260.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 258.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 262.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 29.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 32.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-102.15, 31.25], [-102.25, 31.5], [-102.15, 31.75], [-102.25, 32.0], [-102.15, 32.25], [-102.25, 32.5], [-102.03, 33.03], [-101.5, 33.25], [-101.25, 33.15], [-101.0, 33.25], [-100.75, 33.15], [-100.5, 33.25], [-100.25, 33.15], [-100.0, 33.25], [-99.75, 33.15], [-99.5, 33.25], [-99.25, 33.15], [-99.0, 33.25], [-98.75, 33.15], [-98.5, 33.25], [-97.97, 33.03], [-97.82, 32.68], [-97.47, 32.53], [-97.25, 32.0], [-97.35, 31.75], [-97.25, 31.5], [-97.47, 30.97], [-98.0, 30.75], [-98.25, 30.85], [-98.5, 30.75], [-98.75, 30.85], [-98.82, 30.82], [-98.97, 30.47], [-99.32, 30.32], [-99.35, 30.25], [-99.25, 30.0], [-99.35, 29.75], [-99.25, 29.5], [-99.47, 28.97], [-100.0, 28.75], [-100.53, 28.97], [-100.68, 29.32], [-100.75, 29.35], [-101.0, 29.25], [-101.25, 29.35], [-101.5, 29.25], [-102.03, 29.47], [-102.25, 30.0], [-102.15, 30.25], [-102.25, 30.5], [-102.15, 30.75], [-102.25, 31.0], [-102.15, 31.25]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["C.North-America", "N.Central-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-07-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-102.25, 32.5], [-102.02999999999997, 33.03], [-101.5, 33.25], [-101.25, 33.15], [-101.0, 33.25], [-100.75, 33.15], [-100.5, 33.25], [-100.25, 33.15], [-100.0, 33.25], [-99.75, 33.15], [-99.5, 33.25], [-99.25, 33.15], [-99.0, 33.25], [-98.75, 33.15], [-98.5, 33.25], [-97.97000000000003, 33.03], [-97.82, 32.68], [-97.47000000000003, 32.53], [-97.25, 32.0], [-97.35000000000002, 31.75], [-97.25, 31.5], [-97.47000000000003, 30.97], [-98.0, 30.75], [-98.25, 30.85], [-98.5, 30.75], [-98.75, 30.85], [-98.82, 30.82], [-98.97000000000003, 30.47], [-99.5, 30.25], [-100.02999999999997, 30.47], [-100.18, 30.82], [-100.25, 30.85], [-100.5, 30.75], [-100.75, 30.85], [-101.0, 30.75], [-101.52999999999997, 30.97], [-101.68, 31.32], [-102.02999999999997, 31.47], [-102.25, 32.0], [-102.14999999999998, 32.25], [-102.25, 32.5]]]]}, "2025-07-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-102.25, 30.5], [-102.14999999999998, 30.75], [-102.25, 31.0], [-102.14999999999998, 31.25], [-102.25, 31.5], [-102.14999999999998, 31.75], [-102.25, 32.0], [-102.14999999999998, 32.25], [-102.25, 32.5], [-102.02999999999997, 33.03], [-101.5, 33.25], [-101.25, 33.15], [-101.0, 33.25], [-100.75, 33.15], [-100.5, 33.25], [-100.25, 33.15], [-100.0, 33.25], [-99.75, 33.15], [-99.5, 33.25], [-99.25, 33.15], [-99.0, 33.25], [-98.75, 33.15], [-98.5, 33.25], [-97.97000000000003, 33.03], [-97.82, 32.68], [-97.47000000000003, 32.53], [-97.25, 32.0], [-97.35000000000002, 31.75], [-97.25, 31.5], [-97.47000000000003, 30.97], [-98.0, 30.75], [-98.25, 30.85], [-98.5, 30.75], [-98.75, 30.85], [-98.82, 30.82], [-98.97000000000003, 30.47], [-99.32, 30.32], [-99.35000000000002, 30.25], [-99.25, 30.0], [-99.35000000000002, 29.75], [-99.25, 29.5], [-99.47000000000003, 28.97], [-100.0, 28.75], [-100.52999999999997, 28.97], [-100.68, 29.32], [-100.75, 29.35], [-101.0, 29.25], [-101.25, 29.35], [-101.5, 29.25], [-102.02999999999997, 29.47], [-102.25, 30.0], [-102.14999999999998, 30.25], [-102.25, 30.5]]]]}, "2025-07-14T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-102.25, 30.5], [-102.14999999999998, 30.75], [-102.25, 31.0], [-102.14999999999998, 31.25], [-102.25, 31.5], [-102.14999999999998, 31.75], [-102.25, 32.0], [-102.14999999999998, 32.25], [-102.25, 32.5], [-102.02999999999997, 33.03], [-101.5, 33.25], [-101.25, 33.15], [-101.0, 33.25], [-100.75, 33.15], [-100.5, 33.25], [-100.25, 33.15], [-100.0, 33.25], [-99.75, 33.15], [-99.5, 33.25], [-99.25, 33.15], [-99.0, 33.25], [-98.75, 33.15], [-98.5, 33.25], [-97.97000000000003, 33.03], [-97.82, 32.68], [-97.47000000000003, 32.53], [-97.25, 32.0], [-97.35000000000002, 31.75], [-97.25, 31.5], [-97.47000000000003, 30.97], [-98.0, 30.75], [-98.25, 30.85], [-98.5, 30.75], [-98.75, 30.85], [-98.82, 30.82], [-98.97000000000003, 30.47], [-99.32, 30.32], [-99.35000000000002, 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[-99.35000000000002, 30.25], [-99.25, 30.0], [-99.35000000000002, 29.75], [-99.25, 29.5], [-99.47000000000003, 28.97], [-100.0, 28.75], [-100.52999999999997, 28.97], [-100.68, 29.32], [-100.75, 29.35], [-101.0, 29.25], [-101.25, 29.35], [-101.5, 29.25], [-102.02999999999997, 29.47], [-102.25, 30.0], [-102.14999999999998, 30.25], [-102.25, 30.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -5.278240709217016}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.6928540473293974}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [26.292763588645244, 24.60505758214879, 25.156573938440374, 24.93897380339797]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [25.453792826334677, 23.766255950927757, 23.893080647786462, 23.833411153157556]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.7623818891624903, -4.211679056056779, -3.677914247039777, -3.7824894310183415]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.4589136067868935, -5.278240709217016, -4.555451026193396, -4.608913203269992]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3128727850403705, -1.9847822298139508, -1.709871434853368, -1.7289922920585896]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5991382045391336, -2.4589636506513233, -2.1618023847970465, -2.2704793593198427]}}