{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:10:21.341756", "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": "2026-Feb-26_to_2026-Mar-01_265.5_59.5"}, "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": 2026020000668}, "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 26 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "March 01 2026"}, "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": 61337.0187254945}, "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"]}, "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": 59.5}, "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": 265.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "265.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 265.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 269.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 55.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 60.25}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-93.5, 57.75], [-93.25, 57.65], [-93.18, 57.68], [-93.15, 57.75], [-93.18, 57.82], [-93.53, 57.97], [-93.68, 58.32], [-93.75, 58.35], [-94.0, 58.25], [-94.25, 58.35], [-94.5, 58.25], [-95.03, 58.47], [-95.25, 59.0], [-95.15, 59.25], [-95.25, 59.5], [-95.15, 59.75], [-95.25, 60.0], [-95.03, 60.53], [-94.5, 60.75], [-94.25, 60.65], [-94.0, 60.75], [-93.75, 60.65], [-93.5, 60.75], [-93.25, 60.65], [-93.0, 60.75], [-92.75, 60.65], [-92.5, 60.75], [-92.25, 60.65], [-92.0, 60.75], [-91.47, 60.53], [-91.32, 60.18], [-90.97, 60.03], [-90.75, 59.5], [-90.85, 59.25], [-90.75, 59.0], [-90.85, 58.75], [-90.75, 58.5], [-90.85, 58.25], [-90.75, 58.0], [-90.85, 57.75], [-90.75, 57.5], [-90.87, 57.2], [-90.47, 57.03], [-90.25, 56.5], [-90.47, 55.97], [-90.82, 55.82], [-90.97, 55.47], [-91.5, 55.25], [-92.03, 55.47], [-92.18, 55.82], [-92.53, 55.97], [-92.68, 56.32], [-92.75, 56.35], [-93.0, 56.25], [-93.25, 56.35], [-93.5, 56.25], [-94.03, 56.47], [-94.25, 57.0], [-94.03, 57.53], [-93.5, 57.75]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.E.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-02-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-94.02999999999997, 56.47], [-94.25, 57.0], [-94.02999999999997, 57.53], [-93.5, 57.75], [-93.25, 57.65], [-93.18, 57.68], [-93.02999999999997, 58.03], [-92.5, 58.25], [-91.97000000000003, 58.03], [-91.82, 57.68], [-91.47000000000003, 57.53], [-91.32, 57.18], [-91.25, 57.15], [-91.0, 57.25], [-90.47000000000003, 57.03], [-90.25, 56.5], [-90.47000000000003, 55.97], [-90.82, 55.82], [-90.97000000000003, 55.47], [-91.5, 55.25], [-92.02999999999997, 55.47], [-92.18, 55.82], [-92.52999999999997, 55.97], [-92.68, 56.32], [-92.75, 56.35], [-93.0, 56.25], [-93.25, 56.35], [-93.5, 56.25], [-94.02999999999997, 56.47]]], [[[-95.02999999999997, 60.53], [-94.5, 60.75], [-93.97000000000003, 60.53], [-93.75, 60.0], [-93.85000000000002, 59.75], [-93.75, 59.5], [-93.97000000000003, 58.97], [-94.5, 58.75], [-95.02999999999997, 58.97], [-95.25, 59.5], [-95.14999999999998, 59.75], [-95.25, 60.0], [-95.02999999999997, 60.53]]]]}, "2026-02-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-95.25, 59.5], [-95.14999999999998, 59.75], [-95.25, 60.0], [-95.02999999999997, 60.53], [-94.5, 60.75], [-94.25, 60.65], [-94.0, 60.75], [-93.75, 60.65], [-93.5, 60.75], [-93.25, 60.65], [-93.0, 60.75], [-92.75, 60.65], [-92.5, 60.75], [-92.25, 60.65], [-92.0, 60.75], [-91.47000000000003, 60.53], [-91.32, 60.18], [-90.97000000000003, 60.03], [-90.75, 59.5], [-90.85000000000002, 59.25], [-90.75, 59.0], [-90.85000000000002, 58.75], [-90.75, 58.5], [-90.85000000000002, 58.25], [-90.75, 58.0], [-90.85000000000002, 57.75], [-90.75, 57.5], [-90.87, 57.2], [-90.47000000000003, 57.03], [-90.25, 56.5], [-90.47000000000003, 55.97], [-90.82, 55.82], [-90.97000000000003, 55.47], [-91.5, 55.25], [-92.02999999999997, 55.47], [-92.18, 55.82], [-92.52999999999997, 55.97], [-92.68, 56.32], [-92.75, 56.35], [-93.0, 56.25], [-93.25, 56.35], [-93.5, 56.25], [-94.02999999999997, 56.47], [-94.25, 57.0], [-94.02999999999997, 57.53], [-93.5, 57.75], [-93.25, 57.65], [-93.18, 57.68], [-93.14999999999998, 57.75], [-93.18, 57.82], [-93.52999999999997, 57.97], [-93.68, 58.32], [-93.75, 58.35], [-94.0, 58.25], [-94.25, 58.35], [-94.5, 58.25], [-95.02999999999997, 58.47], [-95.25, 59.0], [-95.14999999999998, 59.25], [-95.25, 59.5]]]]}, "2026-02-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-95.25, 59.5], [-95.14999999999998, 59.75], [-95.25, 60.0], [-95.02999999999997, 60.53], [-94.5, 60.75], [-94.25, 60.65], [-94.0, 60.75], [-93.75, 60.65], [-93.5, 60.75], [-93.25, 60.65], [-93.0, 60.75], [-92.75, 60.65], [-92.5, 60.75], [-92.25, 60.65], [-92.0, 60.75], [-91.47000000000003, 60.53], [-91.32, 60.18], [-90.97000000000003, 60.03], [-90.75, 59.5], [-90.85000000000002, 59.25], [-90.75, 59.0], [-90.85000000000002, 58.75], [-90.75, 58.5], [-90.85000000000002, 58.25], [-90.75, 58.0], [-90.85000000000002, 57.75], [-90.75, 57.5], [-90.87, 57.2], [-90.47000000000003, 57.03], [-90.25, 56.5], [-90.47000000000003, 55.97], [-90.82, 55.82], [-90.97000000000003, 55.47], [-91.5, 55.25], [-92.02999999999997, 55.47], [-92.18, 55.82], [-92.52999999999997, 55.97], [-92.68, 56.32], [-92.75, 56.35], [-93.0, 56.25], [-93.25, 56.35], [-93.5, 56.25], [-94.02999999999997, 56.47], [-94.25, 57.0], [-94.02999999999997, 57.53], [-93.5, 57.75], [-93.25, 57.65], [-93.18, 57.68], [-93.14999999999998, 57.75], [-93.18, 57.82], [-93.52999999999997, 57.97], [-93.68, 58.32], [-93.75, 58.35], [-94.0, 58.25], [-94.25, 58.35], [-94.5, 58.25], [-95.02999999999997, 58.47], [-95.25, 59.0], [-95.14999999999998, 59.25], [-95.25, 59.5]]]]}, "2026-03-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-95.25, 59.5], [-95.14999999999998, 59.75], [-95.25, 60.0], [-95.02999999999997, 60.53], [-94.5, 60.75], [-94.25, 60.65], [-94.0, 60.75], [-93.75, 60.65], [-93.5, 60.75], [-93.25, 60.65], [-93.0, 60.75], [-92.75, 60.65], [-92.5, 60.75], [-92.25, 60.65], [-92.0, 60.75], [-91.47000000000003, 60.53], [-91.32, 60.18], [-90.97000000000003, 60.03], [-90.75, 59.5], [-90.85000000000002, 59.25], [-90.75, 59.0], [-90.85000000000002, 58.75], [-90.75, 58.5], [-90.85000000000002, 58.25], [-90.75, 58.0], [-90.85000000000002, 57.75], [-90.75, 57.5], [-90.97000000000003, 56.97], [-91.5, 56.75], [-91.75, 56.85], [-92.0, 56.75], [-92.52999999999997, 56.97], [-92.68, 57.32], [-93.02999999999997, 57.47], [-93.18, 57.82], [-93.52999999999997, 57.97], [-93.68, 58.32], [-93.75, 58.35], [-94.0, 58.25], [-94.25, 58.35], [-94.5, 58.25], [-95.02999999999997, 58.47], [-95.25, 59.0], [-95.14999999999998, 59.25], [-95.25, 59.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -12.689513189413134}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -9.017842205283262}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-30.976343247384733, -30.881913817556267, -30.33344347100507, -29.429690994613452]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-32.241043472290016, -35.138064448038705, -33.03018226623533, -31.22345390319822]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-9.42557887593017, -9.497849221575096, -9.061727148057045, -8.176704349365684]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-10.60189179767724, -12.689513189413134, -12.436669913384748, -9.11487263139233]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.2358661799663913, -1.5245995406605857, -1.4307133210865695, -1.3899374143584609]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.3336471071462526, -1.9606637142004888, -1.6156915981173807, -1.4809757347562484]}}