{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 09:18:29.248525", "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-Nov-06_to_2018-Nov-09_253.5_48.0"}, "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": 2018110000256}, "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": "November 06 2018"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "November 09 2018"}, "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": 60499.8485447132}, "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": ["Canada", "United States"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.W.North-America", "W.North-America"]}, "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": []}, "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": 48.0}, "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": 253.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "253.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 248.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 253.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 46.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 51.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2018-11-06T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-107.03, 47.47], [-107.25, 48.0], [-107.03, 48.53], [-106.5, 48.75], [-105.97, 48.53], [-105.75, 48.0], [-105.97, 47.47], [-106.5, 47.25], [-107.03, 47.47]]], [[[-111.53, 51.03], [-111.18, 51.18], [-111.03, 51.53], [-110.5, 51.75], [-110.0, 51.54], [-109.5, 51.75], [-108.97, 51.53], [-108.82, 51.18], [-108.47, 51.03], [-108.32, 50.68], [-107.97, 50.53], [-107.82, 50.18], [-107.47, 50.03], [-107.25, 49.5], [-107.35, 49.25], [-107.25, 49.0], [-107.47, 48.47], [-108.0, 48.25], [-108.53, 48.47], [-108.68, 48.82], [-108.75, 48.85], [-109.0, 48.75], [-109.25, 48.85], [-109.5, 48.75], [-109.75, 48.85], [-110.0, 48.75], [-110.25, 48.85], [-110.5, 48.75], [-111.03, 48.97], [-111.25, 49.5], [-111.15, 49.75], [-111.18, 49.82], [-111.53, 49.97], [-111.75, 50.5], [-111.53, 51.03]]]]}, "2018-11-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-111.75, 50.5], [-111.53, 51.03], [-111.18, 51.18], [-111.03, 51.53], [-110.5, 51.75], [-110.25, 51.65], [-110.0, 51.75], [-109.75, 51.65], [-109.5, 51.75], [-108.97, 51.53], [-108.82, 51.18], [-108.47, 51.03], [-108.32, 50.68], [-107.97, 50.53], [-107.82, 50.18], [-107.47, 50.03], [-107.25, 49.5], [-107.35, 49.25], [-107.32, 49.18], [-107.25, 49.15], [-107.0, 49.25], [-106.47, 49.03], [-106.32, 48.68], [-105.97, 48.53], [-105.75, 48.0], [-105.97, 47.47], [-106.5, 47.25], [-106.93, 47.43], [-106.75, 47.0], [-106.97, 46.47], [-107.5, 46.25], [-108.03, 46.47], [-108.18, 46.82], [-108.25, 46.85], [-108.5, 46.75], [-109.03, 46.97], [-109.25, 47.5], [-109.15, 47.75], [-109.25, 48.0], [-109.15, 48.25], [-109.25, 48.5], [-109.15, 48.75], [-109.18, 48.82], [-109.25, 48.85], [-109.5, 48.75], [-109.75, 48.85], [-110.0, 48.75], [-110.25, 48.85], [-110.5, 48.75], [-111.03, 48.97], [-111.25, 49.5], [-111.15, 49.75], [-111.18, 49.82], [-111.53, 49.97], [-111.75, 50.5]]]]}, "2018-11-08T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-111.75, 50.5], [-111.53, 51.03], [-111.18, 51.18], [-111.03, 51.53], [-110.5, 51.75], [-110.25, 51.65], [-110.0, 51.75], [-109.75, 51.65], [-109.5, 51.75], [-108.97, 51.53], [-108.82, 51.18], [-108.47, 51.03], [-108.32, 50.68], [-107.97, 50.53], [-107.82, 50.18], [-107.47, 50.03], [-107.25, 49.5], [-107.35, 49.25], [-107.32, 49.18], [-107.25, 49.15], [-107.0, 49.25], [-106.47, 49.03], [-106.32, 48.68], [-105.97, 48.53], [-105.75, 48.0], [-105.97, 47.47], [-106.5, 47.25], [-106.93, 47.43], [-106.75, 47.0], [-106.97, 46.47], [-107.5, 46.25], [-108.03, 46.47], [-108.18, 46.82], [-108.25, 46.85], [-108.5, 46.75], [-109.03, 46.97], [-109.25, 47.5], [-109.15, 47.75], [-109.25, 48.0], [-109.15, 48.25], [-109.25, 48.5], [-109.15, 48.75], [-109.18, 48.82], [-109.25, 48.85], [-109.5, 48.75], [-109.75, 48.85], [-110.0, 48.75], [-110.25, 48.85], [-110.5, 48.75], [-111.03, 48.97], [-111.25, 49.5], [-111.15, 49.75], [-111.18, 49.82], [-111.53, 49.97], [-111.75, 50.5]]]]}, "2018-11-09T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-111.15, 50.25], [-111.25, 50.5], [-111.15, 50.75], [-111.25, 51.0], [-111.03, 51.53], 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duration", "value": -13.404724392049502}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -10.81928910894891}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-10.195216465181602, -10.242347845950633, -10.825312694064507, -12.900967263180632]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-11.194085898750643, -12.05710500443837, -12.996681730255546, -15.460818940815898]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-10.035371238546773, -10.414986023566598, -10.401781082197733, -12.128976597253786]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-10.942672477342285, -11.200899247886582, -11.655836871071017, -13.404724392049502]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.6085196251506235, -1.656737701658702, -1.6022937824169188, -1.8629943396155135]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.667485863755609, -1.9925788564373201, -1.7262344388425905, -2.170602725249757]}}