{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:22:50.203810", "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": "2022-Sep-07_to_2022-Sep-09_268.5_27.5"}, "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": 2022090000360}, "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": "September 07 2022"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 09 2022"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 3}, "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": 68503.63317444004}, "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": 27.5}, "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": 268.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "268.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 267.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 270.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 26.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 28.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-93.0, 28.75], [-92.75, 28.65], [-92.68, 28.68], [-92.53, 29.03], [-92.0, 29.25], [-91.75, 29.15], [-91.5, 29.25], [-91.25, 29.15], [-91.0, 29.25], [-90.75, 29.15], [-90.5, 29.25], [-89.97, 29.03], [-89.82, 28.68], [-89.47, 28.53], [-89.25, 28.0], [-89.47, 27.47], [-89.82, 27.32], [-89.97, 26.97], [-90.32, 26.82], [-90.35, 26.75], [-90.25, 26.5], [-90.47, 25.97], [-91.0, 25.75], [-91.25, 25.85], [-91.5, 25.75], [-91.75, 25.85], [-92.0, 25.75], [-92.25, 25.85], [-92.5, 25.75], [-93.03, 25.97], [-93.25, 26.5], [-93.15, 26.75], [-93.18, 26.82], [-93.53, 26.97], [-93.75, 27.5], [-93.65, 27.75], [-93.75, 28.0], [-93.53, 28.53], [-93.0, 28.75]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["C.North-America", "E.North-America", "N.Central-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2022-09-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-93.75, 28.0], [-93.52999999999997, 28.53], [-93.0, 28.75], [-92.75, 28.65], [-92.68, 28.68], [-92.52999999999997, 29.03], [-92.0, 29.25], [-91.75, 29.15], [-91.5, 29.25], [-91.25, 29.15], [-91.0, 29.25], [-90.75, 29.15], [-90.5, 29.25], [-89.97000000000003, 29.03], [-89.82, 28.68], [-89.47000000000003, 28.53], [-89.25, 28.0], [-89.47000000000003, 27.47], [-89.82, 27.32], [-89.97000000000003, 26.97], [-90.32, 26.82], [-90.35000000000002, 26.75], [-90.25, 26.5], [-90.47000000000003, 25.97], [-91.0, 25.75], [-91.25, 25.85], [-91.5, 25.75], [-91.75, 25.85], [-92.0, 25.75], [-92.25, 25.85], [-92.5, 25.75], [-93.02999999999997, 25.97], [-93.25, 26.5], [-93.14999999999998, 26.75], [-93.18, 26.82], [-93.52999999999997, 26.97], [-93.75, 27.5], [-93.64999999999998, 27.75], [-93.75, 28.0]]]]}, "2022-09-08T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-93.75, 28.0], [-93.52999999999997, 28.53], [-93.0, 28.75], [-92.75, 28.65], [-92.68, 28.68], [-92.52999999999997, 29.03], [-92.0, 29.25], [-91.75, 29.15], [-91.5, 29.25], [-91.25, 29.15], [-91.0, 29.25], [-90.75, 29.15], [-90.5, 29.25], [-89.97000000000003, 29.03], [-89.82, 28.68], [-89.47000000000003, 28.53], [-89.25, 28.0], [-89.47000000000003, 27.47], [-89.82, 27.32], [-89.97000000000003, 26.97], [-90.32, 26.82], [-90.35000000000002, 26.75], [-90.25, 26.5], [-90.47000000000003, 25.97], [-91.0, 25.75], [-91.25, 25.85], [-91.5, 25.75], [-91.75, 25.85], [-92.0, 25.75], [-92.25, 25.85], [-92.5, 25.75], [-93.02999999999997, 25.97], [-93.25, 26.5], [-93.14999999999998, 26.75], [-93.18, 26.82], [-93.52999999999997, 26.97], [-93.75, 27.5], [-93.64999999999998, 27.75], [-93.75, 28.0]]]]}, "2022-09-09T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-93.75, 28.0], [-93.52999999999997, 28.53], [-93.0, 28.75], [-92.75, 28.65], [-92.68, 28.68], [-92.52999999999997, 29.03], [-92.0, 29.25], [-91.75, 29.15], [-91.5, 29.25], [-91.25, 29.15], [-91.0, 29.25], [-90.75, 29.15], [-90.5, 29.25], [-89.97000000000003, 29.03], [-89.82, 28.68], [-89.47000000000003, 28.53], [-89.25, 28.0], [-89.47000000000003, 27.47], [-89.82, 27.32], [-89.97000000000003, 26.97], [-90.32, 26.82], [-90.35000000000002, 26.75], [-90.25, 26.5], [-90.47000000000003, 25.97], [-91.0, 25.75], [-91.25, 25.85], [-91.5, 25.75], [-91.75, 25.85], [-92.0, 25.75], [-92.25, 25.85], [-92.5, 25.75], [-93.02999999999997, 25.97], [-93.25, 26.5], [-93.14999999999998, 26.75], [-93.18, 26.82], [-93.52999999999997, 26.97], [-93.75, 27.5], [-93.64999999999998, 27.75], [-93.75, 28.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -2.533969623183623}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -1.66453700052841}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [26.40739170528684, 25.80908864478124, 25.756651473619627]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [25.975607282869362, 25.40763318975138, 25.027622921009026]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-1.2884761998845284, -1.8330059972951631, -1.8721288044055382]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-1.713342026988471, -2.1235569627908717, -2.533969623183623]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5004072530396124, -2.146648533352409, -2.2136672238729402]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.9152635466696641, -2.5468491647229263, -2.6647268092493657]}}