{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:19:29.372041", "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": "2022-Apr-26_to_2022-Apr-29_235.5_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": 2022040000880}, "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": "April 26 2022"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 29 2022"}, "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": 267582.7009482318}, "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"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["America", "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": ["Pacific Ocean"]}, "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": 235.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "235.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 229.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 238.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 47.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 54.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-131.0, 54.25], [-130.75, 54.15], [-130.5, 54.25], [-130.25, 54.15], [-130.18, 54.18], [-130.03, 54.53], [-129.5, 54.75], [-129.0, 54.54], [-128.5, 54.75], [-128.2, 54.63], [-128.03, 55.03], [-127.5, 55.25], [-127.25, 55.15], [-127.0, 55.25], [-126.47, 55.03], [-126.25, 54.5], [-126.46, 54.0], [-126.32, 53.68], [-126.25, 53.65], [-126.0, 53.75], [-125.47, 53.53], [-125.32, 53.18], [-125.25, 53.15], [-125.0, 53.25], [-124.47, 53.03], [-124.32, 52.68], [-124.0, 52.54], [-123.5, 52.75], [-122.97, 52.53], [-122.75, 52.0], [-122.85, 51.75], [-122.82, 51.68], [-122.75, 51.65], [-122.5, 51.75], [-121.97, 51.53], [-121.82, 51.18], [-121.47, 51.03], [-121.25, 50.5], [-121.47, 49.97], [-122.0, 49.75], [-122.3, 49.88], [-122.35, 49.75], [-122.25, 49.5], [-122.47, 48.97], [-123.0, 48.75], [-123.5, 48.96], [-123.82, 48.82], [-123.85, 48.75], [-123.82, 48.68], [-123.47, 48.53], [-123.25, 48.0], [-123.35, 47.75], [-123.25, 47.5], [-123.47, 46.97], [-124.0, 46.75], [-124.25, 46.85], [-124.5, 46.75], [-124.75, 46.85], [-125.0, 46.75], [-125.25, 46.85], [-125.5, 46.75], [-125.75, 46.85], [-126.0, 46.75], [-126.25, 46.85], [-126.5, 46.75], [-126.75, 46.85], [-127.0, 46.75], [-127.53, 46.97], [-127.68, 47.32], [-128.03, 47.47], [-128.18, 47.82], [-128.25, 47.85], [-128.5, 47.75], [-129.03, 47.97], [-129.25, 48.5], [-129.12, 48.8], [-129.53, 48.97], [-129.68, 49.32], [-130.03, 49.47], [-130.18, 49.82], [-130.53, 49.97], [-130.75, 50.5], [-130.65, 50.75], [-130.68, 50.82], [-131.03, 50.97], [-131.25, 51.5], [-131.15, 51.75], [-131.25, 52.0], [-131.15, 52.25], [-131.25, 52.5], [-131.15, 52.75], [-131.18, 52.82], [-131.53, 52.97], [-131.75, 53.5], [-131.53, 54.03], [-131.0, 54.25]], [[-125.0, 50.25], [-124.75, 50.15], [-124.63, 50.2], [-124.68, 50.32], [-124.75, 50.35], [-125.0, 50.25]], [[-125.25, 50.35], [-125.37, 50.3], [-125.3, 50.13], [-125.0, 50.25], [-125.25, 50.35]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.W.North-America", "W.North-America", "N.Pacific-Ocean"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2022-04-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-131.53, 52.97], [-131.75, 53.5], [-131.53, 54.03], [-131.0, 54.25], [-130.75, 54.15], [-130.5, 54.25], [-130.25, 54.15], [-130.18, 54.18], [-130.03, 54.53], [-129.5, 54.75], [-129.0, 54.54], [-128.5, 54.75], [-128.2, 54.63], [-128.03, 55.03], [-127.5, 55.25], [-127.25, 55.15], [-127.0, 55.25], [-126.47, 55.03], [-126.25, 54.5], [-126.46000000000001, 54.0], [-126.32, 53.68], [-126.25, 53.65], [-126.0, 53.75], [-125.47, 53.53], [-125.32, 53.18], [-124.97, 53.03], [-124.75, 52.5], [-124.85, 52.25], [-124.82, 52.18], [-124.75, 52.15], [-124.5, 52.25], [-124.25, 52.15], [-124.18, 52.18], [-124.03, 52.53], [-123.5, 52.75], [-122.97, 52.53], [-122.75, 52.0], [-122.85, 51.75], [-122.82, 51.68], [-122.47, 51.53], [-122.25, 51.0], [-122.46000000000001, 50.5], [-122.25, 50.0], [-122.35, 49.75], [-122.25, 49.5], [-122.47, 48.97], [-123.0, 48.75], [-123.5, 48.96], [-123.82, 48.82], [-123.85, 48.75], [-123.82, 48.68], [-123.47, 48.53], [-123.25, 48.0], [-123.35, 47.75], [-123.25, 47.5], [-123.47, 46.97], [-124.0, 46.75], [-124.25, 46.85], [-124.5, 46.75], [-124.75, 46.85], [-125.0, 46.75], [-125.25, 46.85], [-125.5, 46.75], [-125.75, 46.85], [-126.0, 46.75], [-126.25, 46.85], [-126.5, 46.75], [-126.75, 46.85], [-127.0, 46.75], [-127.53, 46.97], [-127.68, 47.32], [-128.03, 47.47], [-128.18, 47.82], [-128.25, 47.85], [-128.5, 47.75], [-129.03, 47.97], [-129.25, 48.5], [-129.12, 48.8], [-129.53, 48.97], [-129.68, 49.32], [-130.03, 49.47], [-130.18, 49.82], [-130.53, 49.97], [-130.75, 50.5], [-130.65, 50.75], [-130.68, 50.82], [-131.03, 50.97], [-131.25, 51.5], [-131.15, 51.75], [-131.25, 52.0], [-131.15, 52.25], [-131.25, 52.5], [-131.15, 52.75], [-131.18, 52.82], [-131.53, 52.97]], [[-124.62, 50.2], [-124.68, 50.32], [-124.75, 50.35], [-125.0, 50.25], [-124.75, 50.15], [-124.62, 50.2]], [[-125.25, 50.35], [-125.37, 50.3], [-125.30000000000001, 50.13], [-125.0, 50.25], [-125.25, 50.35]]]]}, "2022-04-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-131.53, 52.97], [-131.75, 53.5], [-131.53, 54.03], [-131.0, 54.25], [-130.75, 54.15], [-130.5, 54.25], [-130.25, 54.15], [-130.18, 54.18], [-130.03, 54.53], [-129.5, 54.75], [-129.0, 54.54], [-128.5, 54.75], [-128.2, 54.63], [-128.03, 55.03], [-127.5, 55.25], [-127.25, 55.15], [-127.0, 55.25], [-126.47, 55.03], [-126.25, 54.5], [-126.46000000000001, 54.0], [-126.32, 53.68], [-126.25, 53.65], [-126.0, 53.75], [-125.47, 53.53], [-125.32, 53.18], [-125.25, 53.15], [-125.0, 53.25], [-124.47, 53.03], [-124.32, 52.68], [-124.0, 52.54], [-123.5, 52.75], [-122.97, 52.53], [-122.75, 52.0], [-122.85, 51.75], [-122.82, 51.68], [-122.75, 51.65], [-122.5, 51.75], [-121.97, 51.53], [-121.82, 51.18], [-121.47, 51.03], [-121.25, 50.5], [-121.47, 49.97], [-122.0, 49.75], [-122.30000000000001, 49.88], [-122.35, 49.75], [-122.25, 49.5], [-122.47, 48.97], [-123.0, 48.75], [-123.5, 48.96], [-123.82, 48.82], [-123.85, 48.75], [-123.82, 48.68], [-123.47, 48.53], [-123.25, 48.0], [-123.35, 47.75], [-123.25, 47.5], [-123.47, 46.97], [-124.0, 46.75], [-124.25, 46.85], [-124.5, 46.75], [-124.75, 46.85], [-125.0, 46.75], [-125.25, 46.85], [-125.5, 46.75], [-125.75, 46.85], [-126.0, 46.75], [-126.25, 46.85], [-126.5, 46.75], [-126.75, 46.85], [-127.0, 46.75], [-127.53, 46.97], [-127.68, 47.32], [-128.03, 47.47], [-128.18, 47.82], [-128.25, 47.85], [-128.5, 47.75], [-129.03, 47.97], [-129.25, 48.5], [-129.12, 48.8], [-129.53, 48.97], [-129.68, 49.32], [-130.03, 49.47], [-130.18, 49.82], [-130.53, 49.97], [-130.75, 50.5], [-130.65, 50.75], [-130.68, 50.82], [-131.03, 50.97], [-131.25, 51.5], [-131.15, 51.75], [-131.25, 52.0], [-131.15, 52.25], [-131.25, 52.5], [-131.15, 52.75], [-131.18, 52.82], [-131.53, 52.97]], [[-124.62, 50.2], [-124.68, 50.32], [-124.75, 50.35], [-125.0, 50.25], [-124.75, 50.15], [-124.62, 50.2]], [[-125.25, 50.35], [-125.37, 50.3], [-125.30000000000001, 50.13], [-125.0, 50.25], [-125.25, 50.35]]]]}, "2022-04-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-131.53, 52.97], [-131.75, 53.5], [-131.53, 54.03], [-131.0, 54.25], [-130.75, 54.15], [-130.5, 54.25], [-130.25, 54.15], [-130.18, 54.18], [-130.03, 54.53], [-129.5, 54.75], [-129.0, 54.54], [-128.5, 54.75], [-128.2, 54.63], [-128.03, 55.03], [-127.5, 55.25], [-127.25, 55.15], [-127.0, 55.25], [-126.47, 55.03], [-126.25, 54.5], [-126.46000000000001, 54.0], [-126.32, 53.68], [-126.25, 53.65], [-126.0, 53.75], [-125.47, 53.53], [-125.32, 53.18], [-125.25, 53.15], [-125.0, 53.25], [-124.47, 53.03], [-124.32, 52.68], [-124.0, 52.54], [-123.5, 52.75], [-122.97, 52.53], [-122.75, 52.0], [-122.85, 51.75], [-122.82, 51.68], [-122.75, 51.65], [-122.5, 51.75], [-121.97, 51.53], [-121.82, 51.18], [-121.47, 51.03], [-121.25, 50.5], [-121.47, 49.97], [-122.0, 49.75], [-122.30000000000001, 49.88], [-122.35, 49.75], [-122.25, 49.5], [-122.47, 48.97], [-123.0, 48.75], [-123.5, 48.96], [-123.82, 48.82], [-123.85, 48.75], [-123.82, 48.68], [-123.47, 48.53], [-123.25, 48.0], [-123.35, 47.75], [-123.25, 47.5], [-123.47, 46.97], [-124.0, 46.75], [-124.25, 46.85], [-124.5, 46.75], [-124.75, 46.85], [-125.0, 46.75], [-125.25, 46.85], [-125.5, 46.75], [-125.75, 46.85], [-126.0, 46.75], [-126.25, 46.85], [-126.5, 46.75], [-126.75, 46.85], [-127.0, 46.75], [-127.53, 46.97], [-127.68, 47.32], [-128.03, 47.47], [-128.18, 47.82], [-128.25, 47.85], [-128.5, 47.75], [-129.03, 47.97], [-129.25, 48.5], [-129.12, 48.8], [-129.53, 48.97], [-129.68, 49.32], [-130.03, 49.47], [-130.18, 49.82], [-130.53, 49.97], [-130.75, 50.5], [-130.65, 50.75], [-130.68, 50.82], [-131.03, 50.97], [-131.25, 51.5], [-131.15, 51.75], [-131.25, 52.0], [-131.15, 52.25], [-131.25, 52.5], [-131.15, 52.75], [-131.18, 52.82], [-131.53, 52.97]], [[-124.62, 50.2], [-124.68, 50.32], [-124.75, 50.35], [-125.0, 50.25], [-124.75, 50.15], [-124.62, 50.2]], [[-125.25, 50.35], [-125.37, 50.3], [-125.30000000000001, 50.13], [-125.0, 50.25], [-125.25, 50.35]]]]}, "2022-04-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-126.53, 52.47], [-126.75, 53.0], [-126.53, 53.53], [-126.0, 53.75], [-125.47, 53.53], [-125.32, 53.18], [-125.25, 53.15], [-125.0, 53.25], [-124.47, 53.03], [-124.32, 52.68], [-123.97, 52.53], [-123.82, 52.18], [-123.75, 52.15], [-123.5, 52.25], [-122.97, 52.03], [-122.82, 51.68], [-122.75, 51.65], [-122.5, 51.75], [-121.97, 51.53], [-121.82, 51.18], [-121.47, 51.03], [-121.25, 50.5], [-121.47, 49.97], [-122.0, 49.75], [-122.53, 49.97], [-122.68, 50.32], [-122.75, 50.35], [-122.82, 50.32], [-122.97, 49.97], [-123.5, 49.75], [-123.75, 49.85], [-124.0, 49.75], [-124.53, 49.97], [-124.68, 50.32], [-125.03, 50.47], [-125.18, 50.82], [-125.25, 50.85], [-125.5, 50.75], [-125.75, 50.85], [-126.0, 50.75], [-126.53, 50.97], [-126.75, 51.5], [-126.53, 52.03], [-126.12, 52.2], [-126.18, 52.32], [-126.53, 52.47]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.947587206621108}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.4682022924178924}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [3.962595980250171, 3.567633999197085, 3.861247269047851, -2.3552515931274343]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-6.440646943402783, -6.823654527004351, -6.537397855873621, -5.815339417767802]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.338657532551876, -2.5780069963015833, -2.3502426157060747, -3.420180967149523]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.483859446691326, -4.947587206621108, -4.932251011447249, -4.2144499068915025]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5029262388704603, -1.5919402402400658, -1.3975724485839787, -1.4205401928921946]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.00380070989461, -2.0192667340972035, -2.0651122289030606, -1.8295869850822666]}}