{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:26:06.281465", "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": "2021-Jun-30_to_2021-Jul-05_265.0_74.5"}, "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": 2021060001244}, "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 30 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "July 05 2021"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 6}, "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": 69373.51240442999}, "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"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.E.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": ["The Northwestern Passages"]}, "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": 74.5}, "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": 265.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "265.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 259.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 267.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 70.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 74.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-06-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-98.03, 73.97], [-98.25, 74.5], [-98.03, 75.03], [-97.5, 75.25], [-96.97, 75.03], [-96.75, 74.5], [-96.97, 73.97], [-97.5, 73.75], [-98.03, 73.97]]], [[[-95.75, 75.15], [-95.5, 75.25], [-95.25, 75.15], [-95.0, 75.25], [-94.47, 75.03], [-94.25, 74.5], [-94.47, 73.97], [-95.0, 73.75], [-95.25, 73.85], [-95.5, 73.75], [-95.75, 73.85], [-96.0, 73.75], [-96.53, 73.97], [-96.75, 74.5], [-96.53, 75.03], [-96.0, 75.25], [-95.75, 75.15]]]]}, "2021-07-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-101.25, 73.5], [-101.03, 74.03], [-100.5, 74.25], [-100.25, 74.15], [-100.0, 74.25], [-99.75, 74.15], [-99.68, 74.18], [-99.53, 74.53], [-99.18, 74.68], [-99.03, 75.03], [-98.5, 75.25], [-98.25, 75.15], [-98.0, 75.25], [-97.75, 75.15], [-97.5, 75.25], [-96.97, 75.03], [-96.82, 74.68], [-96.75, 74.65], [-96.68, 74.68], [-96.53, 75.03], [-96.0, 75.25], [-95.75, 75.15], [-95.5, 75.25], [-95.25, 75.15], [-95.0, 75.25], [-94.75, 75.15], [-94.5, 75.25], [-93.97, 75.03], [-93.82, 74.68], [-93.47, 74.53], [-93.25, 74.0], [-93.47, 73.47], [-94.0, 73.25], [-94.25, 73.35], [-94.5, 73.25], [-94.75, 73.35], [-95.0, 73.25], [-95.25, 73.35], [-95.5, 73.25], [-95.75, 73.35], [-96.0, 73.25], [-96.25, 73.35], [-96.5, 73.25], [-96.75, 73.35], [-96.87, 73.3], [-96.75, 73.0], [-96.97, 72.47], [-97.5, 72.25], [-97.75, 72.35], [-98.0, 72.25], [-98.25, 72.35], [-98.5, 72.25], [-98.75, 72.35], [-99.0, 72.25], [-99.25, 72.35], [-99.5, 72.25], [-99.75, 72.35], [-100.0, 72.25], [-100.53, 72.47], [-100.68, 72.82], [-101.03, 72.97], [-101.25, 73.5]]]]}, "2021-07-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-101.15, 72.75], [-101.25, 73.0], [-101.15, 73.25], [-101.25, 73.5], [-101.03, 74.03], [-100.5, 74.25], [-100.25, 74.15], [-100.0, 74.25], [-99.75, 74.15], [-99.68, 74.18], [-99.53, 74.53], [-99.18, 74.68], [-99.03, 75.03], [-98.5, 75.25], [-98.25, 75.15], [-98.0, 75.25], [-97.75, 75.15], [-97.5, 75.25], [-96.97, 75.03], [-96.82, 74.68], [-96.75, 74.65], [-96.68, 74.68], [-96.53, 75.03], [-96.0, 75.25], [-95.75, 75.15], [-95.5, 75.25], [-95.25, 75.15], [-95.0, 75.25], [-94.75, 75.15], [-94.5, 75.25], [-93.97, 75.03], [-93.82, 74.68], [-93.75, 74.65], [-93.5, 74.75], [-93.25, 74.65], [-93.0, 74.75], [-92.47, 74.53], [-92.25, 74.0], [-92.47, 73.47], [-93.0, 73.25], [-93.25, 73.35], [-93.32, 73.32], [-93.35, 73.25], [-93.25, 73.0], [-93.35, 72.75], [-93.25, 72.5], [-93.47, 71.97], [-93.82, 71.82], [-93.97, 71.47], [-94.5, 71.25], [-94.75, 71.35], [-94.82, 71.32], [-94.97, 70.97], [-95.5, 70.75], [-95.75, 70.85], [-95.82, 70.82], [-95.97, 70.47], [-96.5, 70.25], [-97.03, 70.47], [-97.25, 71.0], [-97.07, 71.43], [-97.5, 71.25], [-97.75, 71.35], [-97.82, 71.32], [-97.97, 70.97], [-98.5, 70.75], [-98.75, 70.85], [-99.0, 70.75], [-99.25, 70.85], [-99.5, 70.75], [-100.03, 70.97], [-100.18, 71.32], [-100.25, 71.35], [-100.5, 71.25], [-101.03, 71.47], [-101.25, 72.0], [-101.15, 72.25], [-101.25, 72.5], [-101.15, 72.75]], [[-96.75, 71.85], [-96.82, 71.82], [-96.93, 71.57], [-96.68, 71.68], [-96.62, 71.8], [-96.75, 71.85]]]]}, "2021-07-03T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-101.15, 72.75], [-101.25, 73.0], [-101.15, 73.25], [-101.25, 73.5], [-101.03, 74.03], [-100.5, 74.25], [-100.25, 74.15], [-100.0, 74.25], [-99.75, 74.15], [-99.68, 74.18], [-99.53, 74.53], [-99.18, 74.68], [-99.03, 75.03], [-98.5, 75.25], [-98.25, 75.15], [-98.0, 75.25], [-97.75, 75.15], [-97.5, 75.25], [-96.97, 75.03], [-96.82, 74.68], [-96.75, 74.65], [-96.5, 74.75], [-96.25, 74.65], [-96.18, 74.68], [-96.03, 75.03], [-95.5, 75.25], [-95.25, 75.15], [-95.0, 75.25], [-94.75, 75.15], [-94.5, 75.25], [-93.97, 75.03], [-93.82, 74.68], [-93.75, 74.65], [-93.5, 74.75], [-93.25, 74.65], [-93.0, 74.75], [-92.47, 74.53], [-92.25, 74.0], [-92.47, 73.47], [-93.0, 73.25], [-93.25, 73.35], [-93.32, 73.32], [-93.35, 73.25], [-93.25, 73.0], [-93.35, 72.75], [-93.25, 72.5], [-93.47, 71.97], [-93.82, 71.82], [-93.97, 71.47], [-94.5, 71.25], [-94.75, 71.35], [-94.82, 71.32], [-94.97, 70.97], [-95.5, 70.75], [-95.75, 70.85], [-95.82, 70.82], [-95.97, 70.47], [-96.5, 70.25], [-97.03, 70.47], [-97.25, 71.0], [-97.07, 71.43], [-97.5, 71.25], [-97.75, 71.35], [-97.82, 71.32], [-97.97, 70.97], [-98.5, 70.75], [-98.75, 70.85], [-99.0, 70.75], [-99.25, 70.85], [-99.5, 70.75], [-100.03, 70.97], [-100.18, 71.32], [-100.25, 71.35], [-100.5, 71.25], [-101.03, 71.47], [-101.25, 72.0], [-101.15, 72.25], [-101.25, 72.5], [-101.15, 72.75]], [[-96.75, 71.85], [-96.82, 71.82], [-96.93, 71.57], [-96.68, 71.68], [-96.62, 71.8], [-96.75, 71.85]]]]}, "2021-07-04T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-101.15, 72.75], [-101.25, 73.0], [-101.03, 73.53], [-100.5, 73.75], [-100.25, 73.65], [-100.0, 73.75], [-99.75, 73.65], [-99.68, 73.68], [-99.65, 73.75], [-99.75, 74.0], [-99.53, 74.53], [-99.18, 74.68], [-99.03, 75.03], [-98.5, 75.25], [-98.25, 75.15], [-98.0, 75.25], [-97.75, 75.15], [-97.5, 75.25], [-96.97, 75.03], [-96.82, 74.68], [-96.75, 74.65], [-96.5, 74.75], [-96.25, 74.65], [-96.18, 74.68], [-96.03, 75.03], [-95.5, 75.25], [-95.25, 75.15], [-95.0, 75.25], [-94.75, 75.15], [-94.5, 75.25], [-93.97, 75.03], [-93.82, 74.68], [-93.75, 74.65], [-93.5, 74.75], [-93.25, 74.65], [-93.0, 74.75], [-92.47, 74.53], [-92.25, 74.0], [-92.47, 73.47], [-93.0, 73.25], [-93.25, 73.35], [-93.32, 73.32], [-93.35, 73.25], [-93.25, 73.0], [-93.35, 72.75], [-93.25, 72.5], [-93.47, 71.97], [-93.82, 71.82], [-93.97, 71.47], [-94.5, 71.25], [-94.75, 71.35], [-94.82, 71.32], [-94.97, 70.97], [-95.5, 70.75], [-95.75, 70.85], [-95.82, 70.82], [-95.97, 70.47], [-96.5, 70.25], [-97.03, 70.47], [-97.25, 71.0], [-97.07, 71.43], [-97.5, 71.25], [-97.75, 71.35], [-97.82, 71.32], [-97.97, 70.97], [-98.5, 70.75], [-98.75, 70.85], [-99.0, 70.75], [-99.25, 70.85], [-99.5, 70.75], [-100.03, 70.97], [-100.18, 71.32], [-100.25, 71.35], [-100.5, 71.25], [-101.03, 71.47], [-101.25, 72.0], [-101.15, 72.25], [-101.25, 72.5], [-101.15, 72.75]], [[-96.75, 71.85], [-96.82, 71.82], [-96.93, 71.57], [-96.68, 71.68], [-96.62, 71.8], [-96.75, 71.85]]]]}, "2021-07-05T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-99.03, 73.97], [-99.25, 74.5], [-99.03, 75.03], [-98.5, 75.25], [-98.25, 75.15], [-98.0, 75.25], [-97.47, 75.03], [-97.3, 74.63], [-97.0, 74.75], [-96.75, 74.65], [-96.5, 74.75], [-96.25, 74.65], [-96.0, 74.75], [-95.47, 74.53], [-95.25, 74.0], [-95.47, 73.47], [-96.0, 73.25], [-96.25, 73.35], [-96.5, 73.25], [-96.75, 73.35], [-97.0, 73.25], [-97.53, 73.47], [-97.7, 73.88], [-98.0, 73.75], [-98.25, 73.85], [-98.5, 73.75], [-99.03, 73.97]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -7.259273225704817}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.2931537890015425}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [0.6757451313196157, 1.175815765645325, 1.5769468728335596, 1.7604584591594516, 1.9339737148646918, 0.8197563334143183]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [0.6057100603147774, 0.12031413103005661, 0.036234474633261016, -0.014440342385000804, -0.2096802773931472, 0.6997097188905741]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-1.0161110664212316, -3.563838705358166, -4.475887641511054, -4.553676605283535, -4.466986345119597, -1.5758524745072464]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-1.1313553321228937, -5.626120775618801, -6.543920291721804, -6.825382446339404, -7.259273225704817, -1.8537546629253825]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.1570085426415537, -1.4282037089266144, -1.4329281085140104, -1.4000113121514879, -1.3779258563666914, -1.2486724513664142]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.1645197952254522, -1.793260075617556, -1.7035197498742303, -1.6032581212980004, -1.562471588185299, -1.3496076831748374]}}