{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:17:20.590720", "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-Feb-02_to_2022-Feb-04_253.0_40.5"}, "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": 2022020000210}, "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": "February 02 2022"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "February 04 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": 62909.67836030277}, "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": 40.5}, "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": 253.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "253.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 251.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 255.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 39.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 42.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-108.53, 42.03], [-108.12, 42.2], [-108.25, 42.5], [-108.03, 43.03], [-107.5, 43.25], [-107.25, 43.15], [-107.0, 43.25], [-106.75, 43.15], [-106.5, 43.25], [-106.25, 43.15], [-106.0, 43.25], [-105.47, 43.03], [-105.25, 42.5], [-105.37, 42.2], [-104.97, 42.03], [-104.75, 41.5], [-104.85, 41.25], [-104.82, 41.18], [-104.47, 41.03], [-104.25, 40.5], [-104.47, 39.97], [-105.0, 39.75], [-105.53, 39.97], [-105.68, 40.32], [-105.75, 40.35], [-105.82, 40.32], [-105.97, 39.97], [-106.5, 39.75], [-106.75, 39.85], [-106.82, 39.82], [-106.97, 39.47], [-107.32, 39.32], [-107.47, 38.97], [-108.0, 38.75], [-108.25, 38.85], [-108.5, 38.75], [-109.03, 38.97], [-109.25, 39.5], [-109.12, 39.8], [-109.53, 39.97], [-109.75, 40.5], [-109.53, 41.03], [-109.18, 41.18], [-109.03, 41.53], [-108.68, 41.68], [-108.53, 42.03]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.North-America", "C.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2022-02-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-109.03, 41.53], [-108.68, 41.68], [-108.53, 42.03], [-108.12, 42.2], [-108.25, 42.5], [-108.03, 43.03], [-107.5, 43.25], [-107.25, 43.15], [-107.0, 43.25], [-106.75, 43.15], [-106.5, 43.25], [-106.25, 43.15], [-106.0, 43.25], [-105.47, 43.03], [-105.25, 42.5], [-105.37, 42.2], [-104.97, 42.03], [-104.75, 41.5], [-104.85, 41.25], [-104.82, 41.18], [-104.47, 41.03], [-104.25, 40.5], [-104.47, 39.97], [-105.0, 39.75], [-105.53, 39.97], [-105.68, 40.32], [-105.75, 40.35], [-105.82, 40.32], [-105.97, 39.97], [-106.5, 39.75], [-106.75, 39.85], [-106.82, 39.82], [-106.97, 39.47], [-107.32, 39.32], [-107.47, 38.97], [-108.0, 38.75], [-108.25, 38.85], [-108.5, 38.75], [-109.03, 38.97], [-109.25, 39.5], [-109.12, 39.8], [-109.53, 39.97], [-109.75, 40.5], [-109.53, 41.03], [-109.18, 41.18], [-109.03, 41.53]]]]}, "2022-02-03T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-109.03, 41.53], [-108.68, 41.68], [-108.53, 42.03], [-108.12, 42.2], [-108.25, 42.5], [-108.03, 43.03], [-107.5, 43.25], [-107.25, 43.15], [-107.0, 43.25], [-106.75, 43.15], [-106.5, 43.25], [-106.25, 43.15], [-106.0, 43.25], [-105.47, 43.03], [-105.25, 42.5], [-105.37, 42.2], [-104.97, 42.03], [-104.75, 41.5], [-104.85, 41.25], [-104.82, 41.18], [-104.47, 41.03], [-104.25, 40.5], [-104.47, 39.97], [-105.0, 39.75], [-105.53, 39.97], [-105.68, 40.32], [-105.75, 40.35], [-105.82, 40.32], [-105.97, 39.97], [-106.5, 39.75], [-106.75, 39.85], [-106.82, 39.82], [-106.97, 39.47], [-107.32, 39.32], [-107.47, 38.97], [-108.0, 38.75], [-108.25, 38.85], [-108.5, 38.75], [-109.03, 38.97], [-109.25, 39.5], [-109.12, 39.8], [-109.53, 39.97], [-109.75, 40.5], [-109.53, 41.03], [-109.18, 41.18], [-109.03, 41.53]]]]}, "2022-02-04T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-109.03, 41.53], [-108.68, 41.68], [-108.53, 42.03], [-108.12, 42.2], [-108.25, 42.5], [-108.03, 43.03], [-107.5, 43.25], [-107.25, 43.15], [-107.0, 43.25], [-106.75, 43.15], [-106.5, 43.25], [-106.25, 43.15], [-106.0, 43.25], [-105.47, 43.03], [-105.25, 42.5], [-105.37, 42.2], [-104.97, 42.03], [-104.75, 41.5], [-104.85, 41.25], [-104.82, 41.18], [-104.47, 41.03], [-104.25, 40.5], [-104.47, 39.97], [-105.0, 39.75], [-105.53, 39.97], [-105.68, 40.32], [-105.75, 40.35], [-105.82, 40.32], [-105.97, 39.97], [-106.5, 39.75], [-106.75, 39.85], [-106.82, 39.82], [-106.97, 39.47], [-107.32, 39.32], [-107.47, 38.97], [-108.0, 38.75], [-108.25, 38.85], [-108.5, 38.75], [-109.03, 38.97], [-109.25, 39.5], [-109.12, 39.8], [-109.53, 39.97], [-109.75, 40.5], [-109.53, 41.03], [-109.18, 41.18], [-109.03, 41.53]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -16.41004438809381}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -10.26866948908701}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-16.81020348892025, -20.028878781775518, -14.421368020027387]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-19.809835506391067, -23.488009565440365, -16.64086644889028]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-9.847787546035969, -13.20615486717948, -7.752066054045564]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-12.352269786424216, -16.41004438809381, -10.27506296385718]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.765071908518033, -2.3196542382812146, -1.3642553289168189]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.0129245350949656, -2.501000459631667, -1.639764066706433]}}