{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:53:50.997405", "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": "2023-Jun-20_to_2023-Jun-23_277.5_35.0"}, "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": 2023060000745}, "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": "June 20 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "June 23 2023"}, "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": 110961.03973190431}, "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": 35.0}, "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": 277.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "277.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 273.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 279.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 34.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 37.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-86.62, 35.7], [-86.68, 35.82], [-87.03, 35.97], [-87.25, 36.5], [-87.03, 37.03], [-86.68, 37.18], [-86.53, 37.53], [-86.0, 37.75], [-85.75, 37.65], [-85.5, 37.75], [-85.25, 37.65], [-85.0, 37.75], [-84.75, 37.65], [-84.5, 37.75], [-83.97, 37.53], [-83.75, 37.0], [-83.85, 36.75], [-83.75, 36.5], [-83.85, 36.25], [-83.75, 36.0], [-83.85, 35.75], [-83.75, 35.5], [-83.93, 35.07], [-83.5, 35.25], [-83.25, 35.15], [-83.18, 35.18], [-83.03, 35.53], [-82.68, 35.68], [-82.53, 36.03], [-82.0, 36.25], [-81.75, 36.15], [-81.68, 36.18], [-81.53, 36.53], [-81.0, 36.75], [-80.75, 36.65], [-80.5, 36.75], [-79.97, 36.53], [-79.75, 36.0], [-79.85, 35.75], [-79.75, 35.5], [-79.97, 34.97], [-80.32, 34.82], [-80.35, 34.75], [-80.25, 34.5], [-80.47, 33.97], [-81.0, 33.75], [-81.25, 33.85], [-81.32, 33.82], [-81.47, 33.47], [-82.0, 33.25], [-82.25, 33.35], [-82.5, 33.25], [-82.75, 33.35], [-83.0, 33.25], [-83.25, 33.35], [-83.5, 33.25], [-83.75, 33.35], [-84.0, 33.25], [-84.25, 33.35], [-84.5, 33.25], [-85.03, 33.47], [-85.18, 33.82], [-85.25, 33.85], [-85.5, 33.75], [-85.75, 33.85], [-86.0, 33.75], [-86.53, 33.97], [-86.68, 34.32], [-87.03, 34.47], [-87.25, 35.0], [-87.03, 35.53], [-86.62, 35.7]], [[-84.32, 34.82], [-84.35, 34.75], [-84.32, 34.68], [-84.25, 34.65], [-84.18, 34.68], [-84.07, 34.93], [-84.32, 34.82]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2023-06-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-81.02999999999997, 36.03], [-80.5, 36.25], [-79.97000000000003, 36.03], [-79.75, 35.5], [-79.97000000000003, 34.97], [-80.5, 34.75], [-81.02999999999997, 34.97], [-81.25, 35.5], [-81.02999999999997, 36.03]]]]}, "2023-06-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-87.02999999999997, 34.47], [-87.25, 35.0], [-87.02999999999997, 35.53], [-86.62, 35.7], [-86.68, 35.82], [-87.02999999999997, 35.97], [-87.25, 36.5], [-87.02999999999997, 37.03], [-86.68, 37.18], [-86.52999999999997, 37.53], [-86.0, 37.75], [-85.75, 37.65], [-85.5, 37.75], [-85.25, 37.65], [-85.0, 37.75], [-84.75, 37.65], [-84.5, 37.75], [-83.97000000000003, 37.53], [-83.75, 37.0], [-83.85000000000002, 36.75], [-83.75, 36.5], [-83.85000000000002, 36.25], [-83.75, 36.0], [-83.85000000000002, 35.75], [-83.75, 35.5], [-83.93, 35.07], [-83.5, 35.25], [-83.25, 35.15], [-83.18, 35.18], [-83.02999999999997, 35.53], [-82.68, 35.68], [-82.52999999999997, 36.03], [-82.0, 36.25], [-81.75, 36.15], [-81.68, 36.18], [-81.52999999999997, 36.53], [-81.0, 36.75], [-80.75, 36.65], [-80.5, 36.75], [-79.97000000000003, 36.53], [-79.75, 36.0], [-79.85000000000002, 35.75], [-79.75, 35.5], [-79.97000000000003, 34.97], [-80.32, 34.82], [-80.35000000000002, 34.75], [-80.25, 34.5], [-80.47000000000003, 33.97], [-81.0, 33.75], [-81.25, 33.85], [-81.32, 33.82], [-81.47000000000003, 33.47], [-82.0, 33.25], [-82.25, 33.35], [-82.5, 33.25], [-82.75, 33.35], [-83.0, 33.25], [-83.25, 33.35], [-83.5, 33.25], [-83.75, 33.35], [-84.0, 33.25], [-84.25, 33.35], [-84.5, 33.25], [-85.02999999999997, 33.47], [-85.18, 33.82], [-85.25, 33.85], [-85.5, 33.75], [-85.75, 33.85], [-86.0, 33.75], [-86.52999999999997, 33.97], [-86.68, 34.32], [-87.02999999999997, 34.47]], [[-84.25, 34.65], [-84.18, 34.68], [-84.07, 34.93], [-84.32, 34.82], [-84.35000000000002, 34.75], [-84.32, 34.68], [-84.25, 34.65]]]]}, "2023-06-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-87.02999999999997, 34.47], [-87.25, 35.0], [-87.02999999999997, 35.53], [-86.62, 35.7], [-86.68, 35.82], [-87.02999999999997, 35.97], [-87.25, 36.5], [-87.02999999999997, 37.03], [-86.68, 37.18], [-86.52999999999997, 37.53], [-86.0, 37.75], [-85.75, 37.65], [-85.5, 37.75], [-85.25, 37.65], [-85.0, 37.75], [-84.75, 37.65], [-84.5, 37.75], [-83.97000000000003, 37.53], [-83.75, 37.0], [-83.85000000000002, 36.75], [-83.75, 36.5], [-83.85000000000002, 36.25], [-83.75, 36.0], [-83.85000000000002, 35.75], [-83.75, 35.5], [-83.93, 35.07], [-83.5, 35.25], [-83.25, 35.15], [-83.18, 35.18], [-83.02999999999997, 35.53], [-82.68, 35.68], [-82.52999999999997, 36.03], [-82.0, 36.25], [-81.75, 36.15], [-81.68, 36.18], [-81.52999999999997, 36.53], [-81.0, 36.75], [-80.75, 36.65], [-80.5, 36.75], [-79.97000000000003, 36.53], [-79.75, 36.0], [-79.85000000000002, 35.75], [-79.75, 35.5], [-79.97000000000003, 34.97], [-80.32, 34.82], [-80.35000000000002, 34.75], [-80.25, 34.5], [-80.47000000000003, 33.97], [-81.0, 33.75], [-81.25, 33.85], [-81.32, 33.82], [-81.47000000000003, 33.47], [-82.0, 33.25], [-82.25, 33.35], [-82.5, 33.25], [-82.75, 33.35], [-83.0, 33.25], [-83.25, 33.35], [-83.5, 33.25], [-83.75, 33.35], [-84.0, 33.25], [-84.25, 33.35], [-84.5, 33.25], [-85.02999999999997, 33.47], [-85.18, 33.82], [-85.25, 33.85], [-85.5, 33.75], [-85.75, 33.85], [-86.0, 33.75], [-86.52999999999997, 33.97], [-86.68, 34.32], [-87.02999999999997, 34.47]], [[-84.25, 34.65], [-84.18, 34.68], [-84.07, 34.93], [-84.32, 34.82], [-84.35000000000002, 34.75], [-84.32, 34.68], [-84.25, 34.65]]]]}, "2023-06-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-87.02999999999997, 34.47], [-87.25, 35.0], [-87.02999999999997, 35.53], [-86.62, 35.7], [-86.68, 35.82], [-87.02999999999997, 35.97], [-87.25, 36.5], [-87.02999999999997, 37.03], [-86.68, 37.18], [-86.52999999999997, 37.53], [-86.0, 37.75], [-85.75, 37.65], [-85.5, 37.75], [-85.25, 37.65], [-85.0, 37.75], [-84.75, 37.65], [-84.5, 37.75], [-83.97000000000003, 37.53], [-83.75, 37.0], [-83.85000000000002, 36.75], [-83.75, 36.5], [-83.85000000000002, 36.25], [-83.75, 36.0], [-83.85000000000002, 35.75], [-83.75, 35.5], [-83.93, 35.07], [-83.5, 35.25], [-83.25, 35.15], [-83.18, 35.18], [-83.02999999999997, 35.53], [-82.68, 35.68], [-82.52999999999997, 36.03], [-82.0, 36.25], [-81.75, 36.15], [-81.68, 36.18], [-81.52999999999997, 36.53], [-81.0, 36.75], [-80.75, 36.65], [-80.5, 36.75], [-79.97000000000003, 36.53], [-79.75, 36.0], [-79.97000000000003, 35.47], [-80.32, 35.32], [-80.35000000000002, 35.25], [-80.25, 35.0], [-80.35000000000002, 34.75], [-80.25, 34.5], [-80.47000000000003, 33.97], [-81.0, 33.75], [-81.25, 33.85], [-81.32, 33.82], [-81.47000000000003, 33.47], [-82.0, 33.25], [-82.25, 33.35], [-82.5, 33.25], [-82.75, 33.35], [-83.0, 33.25], [-83.25, 33.35], [-83.5, 33.25], [-83.75, 33.35], [-84.0, 33.25], [-84.25, 33.35], [-84.5, 33.25], [-85.02999999999997, 33.47], [-85.18, 33.82], [-85.25, 33.85], [-85.5, 33.75], [-85.75, 33.85], [-86.0, 33.75], [-86.52999999999997, 33.97], [-86.68, 34.32], [-87.02999999999997, 34.47]], [[-84.25, 34.65], [-84.18, 34.68], [-84.07, 34.93], [-84.32, 34.82], [-84.35000000000002, 34.75], [-84.32, 34.68], [-84.25, 34.65]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -7.3312578138334175}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.261657982722862}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [21.729604297076946, 20.837863102234394, 19.423510376782417, 21.64167620767722]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [21.729604297076946, 18.531383521022804, 16.597564171376064, 19.58633567068813]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.2200291828929153, -3.9944524710795677, -5.466694816389631, -3.3262405555320957]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.2200291828929153, -5.45849941779727, -7.3312578138334175, -4.270120867149728]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.2280537841553536, -1.8030201740692429, -2.513740390921759, -1.5220152795475363]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.2280537841553536, -2.234098147058887, -3.209878291918192, -2.0390373490174163]}}