{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 09:10:22.406234", "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": "2018-Mar-21_to_2018-Mar-27_283.0_34.5"}, "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": 2018030000877}, "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 21 2018"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "March 27 2018"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 7}, "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": 186390.62690882478}, "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"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.North-America", "N.Atlantic-Ocean"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["North 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": ["North Atlantic Ocean"]}, "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": 34.5}, "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": 283.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "283.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 281.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 291.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 31.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 36.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2018-03-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-78.03, 33.97], [-78.25, 34.5], [-78.03, 35.03], [-77.5, 35.25], [-77.25, 35.15], [-77.0, 35.25], [-76.75, 35.15], [-76.5, 35.25], [-75.97, 35.03], [-75.75, 34.5], [-75.97, 33.97], [-76.5, 33.75], [-76.75, 33.85], [-77.0, 33.75], [-77.25, 33.85], [-77.5, 33.75], [-78.03, 33.97]]]]}, "2018-03-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-78.03, 33.97], [-78.25, 34.5], [-78.03, 35.03], [-77.5, 35.25], [-77.25, 35.15], [-77.0, 35.25], [-76.75, 35.15], [-76.68, 35.18], [-76.53, 35.53], [-76.18, 35.68], [-76.15, 35.75], [-76.25, 36.0], [-76.15, 36.25], [-76.25, 36.5], [-76.03, 37.03], [-75.5, 37.25], [-75.25, 37.15], [-75.0, 37.25], [-74.75, 37.15], [-74.5, 37.25], [-73.97, 37.03], [-73.75, 36.5], [-73.85, 36.25], [-73.82, 36.18], [-73.75, 36.15], [-73.5, 36.25], [-73.25, 36.15], [-73.0, 36.25], [-72.47, 36.03], [-72.25, 35.5], [-72.35, 35.25], [-72.32, 35.18], [-72.25, 35.15], [-72.0, 35.25], [-71.75, 35.15], [-71.5, 35.25], [-70.97, 35.03], [-70.75, 34.5], [-70.85, 34.25], [-70.75, 34.0], [-70.97, 33.47], [-71.32, 33.32], [-71.35, 33.25], [-71.25, 33.0], [-71.47, 32.47], [-71.82, 32.32], [-71.97, 31.97], [-72.32, 31.82], [-72.47, 31.47], [-73.0, 31.25], [-73.25, 31.35], [-73.5, 31.25], [-74.03, 31.47], [-74.18, 31.82], [-74.53, 31.97], [-74.75, 32.5], [-74.65, 32.75], [-74.68, 32.82], [-75.03, 32.97], [-75.2, 33.38], [-75.5, 33.25], [-76.03, 33.47], [-76.18, 33.82], [-76.25, 33.85], [-76.5, 33.75], [-76.75, 33.85], [-77.0, 33.75], [-77.25, 33.85], [-77.5, 33.75], [-78.03, 33.97]]]]}, "2018-03-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-77.5, 35.75], [-76.97, 35.53], [-76.82, 35.18], [-76.75, 35.15], [-76.68, 35.18], [-76.53, 35.53], [-76.18, 35.68], [-76.15, 35.75], [-76.25, 36.0], [-76.15, 36.25], [-76.25, 36.5], [-76.03, 37.03], [-75.5, 37.25], [-75.25, 37.15], [-75.0, 37.25], [-74.75, 37.15], [-74.5, 37.25], [-73.97, 37.03], [-73.75, 36.5], [-73.85, 36.25], [-73.82, 36.18], [-73.75, 36.15], [-73.5, 36.25], [-73.25, 36.15], [-73.0, 36.25], [-72.47, 36.03], [-72.25, 35.5], [-72.35, 35.25], [-72.32, 35.18], [-72.25, 35.15], [-72.0, 35.25], [-71.75, 35.15], [-71.5, 35.25], [-71.25, 35.15], [-71.0, 35.25], [-70.75, 35.15], [-70.5, 35.25], [-70.25, 35.15], [-70.0, 35.25], [-69.75, 35.15], [-69.5, 35.25], [-69.25, 35.15], [-69.0, 35.25], [-68.47, 35.03], [-68.25, 34.5], [-68.35, 34.25], [-68.25, 34.0], [-68.35, 33.75], [-68.25, 33.5], [-68.47, 32.97], [-69.0, 32.75], [-69.25, 32.85], [-69.5, 32.75], [-69.75, 32.85], [-70.0, 32.75], [-70.53, 32.97], [-70.68, 33.32], [-70.75, 33.35], [-71.0, 33.25], [-71.25, 33.35], [-71.32, 33.32], [-71.35, 33.25], [-71.25, 33.0], [-71.47, 32.47], [-71.82, 32.32], [-71.97, 31.97], [-72.32, 31.82], [-72.47, 31.47], [-73.0, 31.25], [-73.25, 31.35], [-73.5, 31.25], [-74.03, 31.47], [-74.18, 31.82], [-74.53, 31.97], [-74.75, 32.5], [-74.65, 32.75], [-74.68, 32.82], [-75.03, 32.97], [-75.2, 33.38], [-75.5, 33.25], [-76.03, 33.47], [-76.18, 33.82], [-76.25, 33.85], [-76.5, 33.75], [-76.75, 33.85], [-77.0, 33.75], [-77.25, 33.85], [-77.5, 33.75], [-77.75, 33.85], [-78.0, 33.75], [-78.53, 33.97], [-78.75, 34.5], [-78.53, 35.03], [-78.18, 35.18], [-78.03, 35.53], [-77.5, 35.75]]]]}, "2018-03-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-77.5, 35.75], [-77.0, 35.54], [-76.5, 35.75], [-76.25, 35.65], [-76.18, 35.68], [-76.15, 35.75], [-76.25, 36.0], [-76.15, 36.25], [-76.25, 36.5], [-76.03, 37.03], [-75.5, 37.25], [-75.25, 37.15], [-75.0, 37.25], [-74.75, 37.15], [-74.5, 37.25], [-73.97, 37.03], [-73.75, 36.5], [-73.85, 36.25], [-73.82, 36.18], [-73.75, 36.15], [-73.5, 36.25], [-73.25, 36.15], [-73.0, 36.25], [-72.47, 36.03], [-72.25, 35.5], [-72.35, 35.25], [-72.32, 35.18], [-72.25, 35.15], [-72.0, 35.25], [-71.75, 35.15], [-71.5, 35.25], [-71.25, 35.15], [-71.0, 35.25], [-70.75, 35.15], [-70.5, 35.25], [-70.25, 35.15], [-70.0, 35.25], [-69.75, 35.15], [-69.5, 35.25], [-69.25, 35.15], [-69.0, 35.25], [-68.47, 35.03], [-68.25, 34.5], [-68.35, 34.25], [-68.25, 34.0], [-68.35, 33.75], [-68.25, 33.5], [-68.47, 32.97], [-69.0, 32.75], [-69.25, 32.85], [-69.5, 32.75], [-69.75, 32.85], [-70.0, 32.75], [-70.53, 32.97], [-70.68, 33.32], [-70.75, 33.35], [-71.0, 33.25], [-71.25, 33.35], [-71.32, 33.32], [-71.35, 33.25], [-71.25, 33.0], [-71.47, 32.47], [-71.82, 32.32], [-71.97, 31.97], [-72.32, 31.82], [-72.47, 31.47], [-73.0, 31.25], [-73.25, 31.35], [-73.5, 31.25], [-74.03, 31.47], [-74.18, 31.82], [-74.53, 31.97], [-74.75, 32.5], [-74.65, 32.75], [-74.68, 32.82], [-75.03, 32.97], [-75.2, 33.38], [-75.5, 33.25], [-76.03, 33.47], [-76.18, 33.82], [-76.25, 33.85], [-76.5, 33.75], [-76.75, 33.85], [-77.0, 33.75], [-77.25, 33.85], [-77.5, 33.75], [-77.75, 33.85], [-78.0, 33.75], [-78.53, 33.97], [-78.75, 34.5], [-78.53, 35.03], [-78.18, 35.18], [-78.03, 35.53], [-77.5, 35.75]]]]}, "2018-03-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-73.0, 35.75], [-72.47, 35.53], [-72.32, 35.18], [-72.25, 35.15], [-72.0, 35.25], [-71.75, 35.15], [-71.5, 35.25], [-71.25, 35.15], [-71.0, 35.25], [-70.75, 35.15], [-70.5, 35.25], [-70.25, 35.15], [-70.0, 35.25], [-69.75, 35.15], [-69.5, 35.25], [-69.25, 35.15], [-69.0, 35.25], [-68.47, 35.03], [-68.25, 34.5], [-68.35, 34.25], [-68.25, 34.0], [-68.35, 33.75], [-68.25, 33.5], [-68.47, 32.97], [-69.0, 32.75], [-69.25, 32.85], [-69.5, 32.75], [-69.75, 32.85], [-70.0, 32.75], [-70.53, 32.97], [-70.68, 33.32], [-70.75, 33.35], [-71.0, 33.25], [-71.25, 33.35], [-71.5, 33.25], [-72.03, 33.47], [-72.18, 33.82], [-72.25, 33.85], [-72.5, 33.75], [-72.75, 33.85], [-73.0, 33.75], [-73.53, 33.97], [-73.75, 34.5], [-73.65, 34.75], [-73.75, 35.0], [-73.53, 35.53], [-73.0, 35.75]]], [[[-77.0, 35.54], [-76.5, 35.75], [-76.2, 35.62], [-76.15, 35.75], [-76.25, 36.0], [-76.03, 36.53], [-75.5, 36.75], [-74.97, 36.53], [-74.75, 36.0], [-74.85, 35.75], [-74.75, 35.5], [-74.97, 34.97], [-75.5, 34.75], [-75.8, 34.88], [-75.97, 34.47], [-76.32, 34.32], [-76.47, 33.97], [-77.0, 33.75], [-77.25, 33.85], [-77.5, 33.75], [-77.75, 33.85], [-78.0, 33.75], [-78.53, 33.97], [-78.75, 34.5], [-78.53, 35.03], [-78.18, 35.18], [-78.03, 35.53], [-77.5, 35.75], [-77.0, 35.54]]]]}, "2018-03-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-76.5, 35.75], [-75.97, 35.53], [-75.75, 35.0], [-75.97, 34.47], [-76.32, 34.32], [-76.47, 33.97], [-77.0, 33.75], [-77.53, 33.97], [-77.75, 34.5], [-77.53, 35.03], [-77.18, 35.18], [-77.03, 35.53], [-76.5, 35.75]]]]}, "2018-03-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-76.5, 35.75], [-75.97, 35.53], [-75.75, 35.0], [-75.97, 34.47], [-76.5, 34.25], [-77.03, 34.47], [-77.25, 35.0], [-77.03, 35.53], [-76.5, 35.75]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -6.98200712099765}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.732099137840451}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [8.773375122337768, 10.684452824871755, 11.212822695947239, 10.871143847201324, 10.733376346900684, 8.07396803550057, 8.008526506099429]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [7.980414049206047, 4.608840832978501, 5.687860982245468, 5.348447546993555, 5.944360462356201, 7.825617609350104, 8.008526506099429]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.026584280735847, -4.924754907346823, -4.486226326050011, -4.817450502755543, -4.611172230726232, -5.635489021752193, -5.6767774745465545]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.1932765040684785, -6.27410095849973, -6.430671106689545, -6.741503896386007, -6.98200712099765, -5.711231748498108, -5.6767774745465545]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5149171288982766, -1.7171051423616064, -1.5906038645350637, -1.6664141646380781, -1.6048229062670791, -1.544669408818098, -1.5544257709312932]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5333436380413052, -1.9490548573097148, -1.9212622717745769, -1.988813057489353, -1.820811405956207, -1.599622811042973, -1.5544257709312932]}}