{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:55:39.155442", "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": "2023-Oct-28_to_2023-Nov-01_276.0_51.0"}, "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": 2023100000636}, "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": "October 28 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "November 01 2023"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 5}, "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": 80793.28406597525}, "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": 51.0}, "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": 276.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "276.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 273.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 279.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 50.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 52.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-81.25, 52.65], [-81.0, 52.75], [-80.47, 52.53], [-80.25, 52.0], [-80.35, 51.75], [-80.25, 51.5], [-80.47, 50.97], 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"value": ["N.E.North-America", "E.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2023-10-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-87.25, 52.0], [-87.02999999999997, 52.53], [-86.5, 52.75], [-86.25, 52.65], [-86.0, 52.75], [-85.75, 52.65], [-85.5, 52.75], [-84.97000000000003, 52.53], [-84.82, 52.18], [-84.75, 52.15], [-84.5, 52.25], [-84.25, 52.15], [-84.0, 52.25], [-83.75, 52.15], [-83.5, 52.25], [-83.25, 52.15], [-83.0, 52.25], [-82.75, 52.15], [-82.5, 52.25], [-81.97000000000003, 52.03], [-81.75, 51.5], [-81.97000000000003, 50.97], [-82.32, 50.82], [-82.47000000000003, 50.47], [-83.0, 50.25], [-83.25, 50.35], [-83.5, 50.25], [-83.75, 50.35], [-84.0, 50.25], [-84.25, 50.35], [-84.5, 50.25], [-84.75, 50.35], [-85.0, 50.25], [-85.25, 50.35], [-85.5, 50.25], [-85.75, 50.35], [-86.0, 50.25], [-86.52999999999997, 50.47], [-86.68, 50.82], [-87.02999999999997, 50.97], [-87.25, 51.5], [-87.14999999999998, 51.75], [-87.25, 52.0]]]]}, "2023-10-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-87.52999999999997, 51.47], [-87.75, 52.0], [-87.52999999999997, 52.53], [-87.0, 52.75], [-86.75, 52.65], [-86.5, 52.75], [-86.25, 52.65], [-86.0, 52.75], [-85.75, 52.65], [-85.5, 52.75], [-85.25, 52.65], [-85.0, 52.75], [-84.75, 52.65], [-84.5, 52.75], [-84.25, 52.65], [-84.0, 52.75], [-83.75, 52.65], [-83.68, 52.68], [-83.52999999999997, 53.03], [-83.0, 53.25], [-82.75, 53.15], [-82.5, 53.25], [-82.25, 53.15], [-82.0, 53.25], [-81.47000000000003, 53.03], [-81.32, 52.68], [-80.97000000000003, 52.53], [-80.82, 52.18], [-80.47000000000003, 52.03], [-80.25, 51.5], [-80.47000000000003, 50.97], [-80.82, 50.82], [-80.97000000000003, 50.47], [-81.5, 50.25], [-81.75, 50.35], [-82.0, 50.25], [-82.25, 50.35], [-82.5, 50.25], [-82.75, 50.35], [-83.0, 50.25], [-83.25, 50.35], [-83.5, 50.25], [-83.75, 50.35], [-83.82, 50.32], [-83.97000000000003, 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-10.036105076112051}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -6.5580324760340165}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-4.834254080481344, -5.967144550954686, -7.5906844275251615, -8.236920450587036, -5.698501623590914]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-5.518876186793477, -7.521181750817902, -9.305667126786602, -10.153878253181233, -6.569700833202376]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.831463345423587, -5.9011564159899415, -7.449254848915493, -7.825576885064258, -5.12750634225056]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.493256943724077, 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