{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:10:46.663263", "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": "2026-Mar-16_to_2026-Mar-18_269.0_41.5"}, "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": 2026030000502}, "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": "March 16 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "March 18 2026"}, "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": 72885.93348651075}, "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": 41.5}, "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": 269.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "269.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 268.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 271.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 41.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 43.75}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-92.25, 43.0], [-92.03, 43.53], [-91.68, 43.68], [-91.53, 44.03], [-91.0, 44.25], [-90.75, 44.15], [-90.5, 44.25], [-90.25, 44.15], [-90.0, 44.25], [-89.75, 44.15], [-89.5, 44.25], [-89.25, 44.15], [-89.0, 44.25], [-88.75, 44.15], [-88.5, 44.25], [-87.97, 44.03], [-87.75, 43.5], [-87.85, 43.25], [-87.75, 43.0], [-87.85, 42.75], [-87.75, 42.5], [-87.85, 42.25], [-87.75, 42.0], [-87.97, 41.47], [-88.32, 41.32], [-88.47, 40.97], [-89.0, 40.75], [-89.25, 40.85], [-89.5, 40.75], [-89.75, 40.85], [-90.0, 40.75], [-90.25, 40.85], [-90.5, 40.75], [-90.75, 40.85], [-91.0, 40.75], [-91.53, 40.97], [-91.68, 41.32], [-92.03, 41.47], [-92.25, 42.0], [-92.15, 42.25], [-92.25, 42.5], [-92.15, 42.75], [-92.25, 43.0]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["C.North-America", "E.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-03-16T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-92.25, 42.5], [-92.14999999999998, 42.75], [-92.25, 43.0], [-92.02999999999997, 43.53], [-91.68, 43.68], [-91.52999999999997, 44.03], [-91.0, 44.25], [-90.75, 44.15], [-90.5, 44.25], [-90.25, 44.15], [-90.0, 44.25], [-89.75, 44.15], [-89.5, 44.25], [-89.25, 44.15], [-89.0, 44.25], [-88.75, 44.15], [-88.5, 44.25], [-87.97000000000003, 44.03], [-87.75, 43.5], [-87.85000000000002, 43.25], [-87.75, 43.0], [-87.85000000000002, 42.75], [-87.75, 42.5], [-87.85000000000002, 42.25], [-87.75, 42.0], [-87.97000000000003, 41.47], [-88.32, 41.32], [-88.47000000000003, 40.97], [-89.0, 40.75], [-89.25, 40.85], [-89.5, 40.75], [-89.75, 40.85], [-90.0, 40.75], [-90.25, 40.85], [-90.5, 40.75], [-90.75, 40.85], [-91.0, 40.75], [-91.52999999999997, 40.97], [-91.68, 41.32], [-92.02999999999997, 41.47], [-92.25, 42.0], [-92.14999999999998, 42.25], [-92.25, 42.5]]]]}, "2026-03-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-92.25, 42.5], [-92.14999999999998, 42.75], [-92.25, 43.0], [-92.02999999999997, 43.53], [-91.68, 43.68], [-91.52999999999997, 44.03], [-91.0, 44.25], [-90.75, 44.15], [-90.5, 44.25], [-90.25, 44.15], [-90.0, 44.25], [-89.75, 44.15], [-89.5, 44.25], [-89.25, 44.15], [-89.0, 44.25], [-88.75, 44.15], [-88.5, 44.25], [-87.97000000000003, 44.03], [-87.75, 43.5], [-87.85000000000002, 43.25], [-87.75, 43.0], [-87.85000000000002, 42.75], [-87.75, 42.5], [-87.85000000000002, 42.25], [-87.75, 42.0], [-87.97000000000003, 41.47], [-88.32, 41.32], [-88.47000000000003, 40.97], [-89.0, 40.75], [-89.25, 40.85], [-89.5, 40.75], [-89.75, 40.85], [-90.0, 40.75], [-90.25, 40.85], [-90.5, 40.75], [-90.75, 40.85], [-91.0, 40.75], [-91.52999999999997, 40.97], [-91.68, 41.32], [-92.02999999999997, 41.47], [-92.25, 42.0], [-92.14999999999998, 42.25], [-92.25, 42.5]]]]}, "2026-03-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-92.25, 42.5], [-92.14999999999998, 42.75], [-92.25, 43.0], [-92.02999999999997, 43.53], [-91.68, 43.68], [-91.52999999999997, 44.03], [-91.0, 44.25], [-90.75, 44.15], [-90.5, 44.25], [-90.25, 44.15], [-90.0, 44.25], [-89.75, 44.15], [-89.5, 44.25], [-89.25, 44.15], [-89.0, 44.25], [-88.75, 44.15], [-88.5, 44.25], [-87.97000000000003, 44.03], [-87.75, 43.5], [-87.85000000000002, 43.25], [-87.75, 43.0], [-87.85000000000002, 42.75], [-87.75, 42.5], [-87.85000000000002, 42.25], [-87.75, 42.0], [-87.97000000000003, 41.47], [-88.32, 41.32], [-88.47000000000003, 40.97], [-89.0, 40.75], [-89.25, 40.85], [-89.5, 40.75], [-89.75, 40.85], [-90.0, 40.75], [-90.25, 40.85], [-90.5, 40.75], [-90.75, 40.85], [-91.0, 40.75], [-91.52999999999997, 40.97], [-91.68, 41.32], [-92.02999999999997, 41.47], [-92.25, 42.0], [-92.14999999999998, 42.25], [-92.25, 42.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -15.835940451723786}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -9.592804754287263}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-4.961842600504497, -10.69881668090818, -3.0984596252441747]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-6.829228464762366, -11.510273996988929, -5.361729685465491]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-7.99159226749652, -14.045526836296391, -6.7412951590688674]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-10.218362835765674, -15.835940451723786, -8.015499711211817]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4359751518563602, -2.6248344484131385, -1.2901467741110373]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.8428851875466274, -2.921792421624641, -1.522473416052705]}}