{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:10:45.721431", "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-Mar-13_to_2026-Mar-15_240.5_51.5"}, "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": 2026030000425}, "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 13 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "March 15 2026"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 3}, "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": 79511.20098801135}, "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": 51.5}, "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": 240.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "240.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 237.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 244.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 50.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 54.25}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-122.18, 54.18], [-122.03, 54.53], [-121.5, 54.75], [-120.97, 54.53], [-120.82, 54.18], [-120.75, 54.15], [-120.68, 54.18], [-120.53, 54.53], [-120.0, 54.75], [-119.47, 54.53], [-119.32, 54.18], [-119.25, 54.15], [-119.0, 54.25], [-118.47, 54.03], [-118.25, 53.5], [-118.46, 53.0], [-118.25, 52.5], [-118.35, 52.25], [-118.3, 52.13], [-118.0, 52.25], [-117.75, 52.15], [-117.5, 52.25], [-117.0, 52.04], [-116.5, 52.25], [-116.25, 52.15], [-116.0, 52.25], [-115.47, 52.03], [-115.25, 51.5], [-115.47, 50.97], [-115.87, 50.8], [-115.75, 50.5], [-115.97, 49.97], [-116.5, 49.75], [-116.75, 49.85], [-117.0, 49.75], [-117.5, 49.96], [-118.0, 49.75], [-118.53, 49.97], [-118.68, 50.32], [-118.75, 50.35], [-118.82, 50.32], [-118.97, 49.97], [-119.5, 49.75], [-120.03, 49.97], [-120.25, 50.5], [-120.12, 50.8], [-120.25, 50.85], [-120.5, 50.75], [-121.03, 50.97], [-121.18, 51.32], [-121.25, 51.35], [-121.5, 51.25], [-122.03, 51.47], [-122.25, 52.0], [-122.15, 52.25], [-122.18, 52.32], [-122.53, 52.47], [-122.75, 53.0], [-122.65, 53.25], [-122.75, 53.5], [-122.53, 54.03], [-122.18, 54.18]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.W.North-America", "W.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-03-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-122.75, 53.5], [-122.53, 54.03], [-122.18, 54.18], [-122.03, 54.53], [-121.5, 54.75], [-120.97, 54.53], [-120.82, 54.18], [-120.75, 54.15], [-120.68, 54.18], [-120.53, 54.53], [-120.0, 54.75], [-119.47, 54.53], [-119.32, 54.18], [-119.25, 54.15], [-119.0, 54.25], [-118.47, 54.03], [-118.25, 53.5], [-118.46000000000001, 53.0], [-118.25, 52.5], [-118.35, 52.25], [-118.30000000000001, 52.13], [-118.0, 52.25], [-117.75, 52.15], [-117.5, 52.25], [-117.0, 52.04], [-116.5, 52.25], [-116.25, 52.15], [-116.0, 52.25], [-115.47, 52.03], [-115.25, 51.5], [-115.47, 50.97], [-115.87, 50.8], [-115.75, 50.5], [-115.97, 49.97], [-116.5, 49.75], [-116.75, 49.85], [-117.0, 49.75], [-117.5, 49.96], [-118.0, 49.75], [-118.53, 49.97], [-118.68, 50.32], [-118.75, 50.35], [-118.82, 50.32], [-118.97, 49.97], [-119.5, 49.75], [-120.03, 49.97], [-120.25, 50.5], [-120.12, 50.8], [-120.25, 50.85], [-120.5, 50.75], [-121.03, 50.97], [-121.18, 51.32], [-121.25, 51.35], [-121.5, 51.25], [-122.03, 51.47], [-122.25, 52.0], [-122.15, 52.25], [-122.18, 52.32], [-122.53, 52.47], [-122.75, 53.0], [-122.65, 53.25], [-122.75, 53.5]]]]}, "2026-03-14T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-122.75, 53.5], [-122.53, 54.03], [-122.18, 54.18], [-122.03, 54.53], [-121.5, 54.75], [-120.97, 54.53], [-120.82, 54.18], [-120.75, 54.15], [-120.68, 54.18], [-120.53, 54.53], [-120.0, 54.75], [-119.47, 54.53], [-119.32, 54.18], [-119.25, 54.15], [-119.0, 54.25], [-118.47, 54.03], [-118.25, 53.5], [-118.46000000000001, 53.0], [-118.25, 52.5], [-118.35, 52.25], [-118.30000000000001, 52.13], [-118.0, 52.25], [-117.75, 52.15], [-117.5, 52.25], [-117.0, 52.04], [-116.5, 52.25], [-116.25, 52.15], [-116.0, 52.25], [-115.47, 52.03], [-115.25, 51.5], [-115.47, 50.97], [-115.87, 50.8], [-115.75, 50.5], [-115.97, 49.97], [-116.5, 49.75], [-116.75, 49.85], [-117.0, 49.75], [-117.5, 49.96], [-118.0, 49.75], [-118.53, 49.97], [-118.68, 50.32], [-118.75, 50.35], [-118.82, 50.32], [-118.97, 49.97], [-119.5, 49.75], [-120.03, 49.97], [-120.25, 50.5], [-120.12, 50.8], [-120.25, 50.85], [-120.5, 50.75], [-121.03, 50.97], [-121.18, 51.32], [-121.25, 51.35], [-121.5, 51.25], [-122.03, 51.47], [-122.25, 52.0], [-122.15, 52.25], [-122.18, 52.32], [-122.53, 52.47], [-122.75, 53.0], [-122.65, 53.25], [-122.75, 53.5]]]]}, "2026-03-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-122.75, 53.5], [-122.53, 54.03], [-122.18, 54.18], [-122.03, 54.53], [-121.5, 54.75], [-120.97, 54.53], [-120.82, 54.18], [-120.75, 54.15], [-120.68, 54.18], [-120.53, 54.53], [-120.0, 54.75], [-119.47, 54.53], [-119.32, 54.18], [-119.25, 54.15], [-119.0, 54.25], [-118.47, 54.03], [-118.25, 53.5], [-118.46000000000001, 53.0], [-118.25, 52.5], [-118.35, 52.25], [-118.30000000000001, 52.13], [-118.0, 52.25], [-117.75, 52.15], [-117.5, 52.25], [-117.0, 52.04], [-116.5, 52.25], [-116.25, 52.15], [-116.0, 52.25], [-115.47, 52.03], [-115.25, 51.5], [-115.47, 50.97], [-115.87, 50.8], [-115.75, 50.5], [-115.97, 49.97], [-116.5, 49.75], [-116.75, 49.85], [-117.0, 49.75], [-117.5, 49.96], [-118.0, 49.75], [-118.53, 49.97], [-118.68, 50.32], [-118.75, 50.35], [-118.82, 50.32], [-118.97, 49.97], [-119.5, 49.75], [-120.03, 49.97], [-120.25, 50.5], [-120.12, 50.8], [-120.25, 50.85], [-120.5, 50.75], [-121.03, 50.97], [-121.18, 51.32], [-121.25, 51.35], [-121.5, 51.25], [-122.03, 51.47], [-122.25, 52.0], [-122.15, 52.25], [-122.18, 52.32], [-122.53, 52.47], [-122.75, 53.0], [-122.65, 53.25], [-122.75, 53.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -9.204934013509899}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -7.0763006575246346}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-10.140198135375954, -10.273894358438213, -10.610191257416204]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-15.418638610839821, -17.07268371582029, -17.676264190673805]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-6.722721276258837, -7.036253087132091, -7.4699276091829665]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-8.63258309022416, -8.805047800149964, -9.204934013509899]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5158413565078772, -1.6401082915055458, -1.8182436918264502]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.9905121412495752, -2.0134473419985257, -2.2021695074307805]}}