{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:05:47.863093", "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": "2025-Jun-20_to_2025-Jun-22_249.5_60.0"}, "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": 2025060000699}, "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 20 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "June 22 2025"}, "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": 51914.60661676667}, "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": 60.0}, "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": 249.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "249.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 245.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 253.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 59.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 61.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-115.25, 60.5], [-115.03, 61.03], [-114.5, 61.25], [-114.25, 61.15], [-114.18, 61.18], [-114.03, 61.53], [-113.5, 61.75], [-113.25, 61.65], [-113.0, 61.75], [-112.75, 61.65], [-112.5, 61.75], [-112.25, 61.65], [-112.0, 61.75], [-111.75, 61.65], [-111.5, 61.75], [-111.25, 61.65], [-111.18, 61.68], [-111.03, 62.03], [-110.5, 62.25], [-109.97, 62.03], [-109.75, 61.5], [-109.85, 61.25], [-109.82, 61.18], [-109.75, 61.15], [-109.5, 61.25], [-109.25, 61.15], [-109.0, 61.25], [-108.47, 61.03], [-108.32, 60.68], [-108.25, 60.65], [-108.0, 60.75], [-107.47, 60.53], [-107.32, 60.18], [-107.25, 60.15], [-107.0, 60.25], [-106.47, 60.03], [-106.25, 59.5], [-106.47, 58.97], [-107.0, 58.75], [-107.25, 58.85], [-107.5, 58.75], [-108.03, 58.97], [-108.18, 59.32], [-108.25, 59.35], [-108.5, 59.25], [-108.75, 59.35], [-109.0, 59.25], [-109.25, 59.35], [-109.5, 59.25], [-109.75, 59.35], [-110.0, 59.25], [-110.25, 59.35], [-110.5, 59.25], [-110.75, 59.35], [-111.0, 59.25], [-111.25, 59.35], [-111.5, 59.25], [-111.75, 59.35], [-112.0, 59.25], [-112.25, 59.35], [-112.5, 59.25], [-112.75, 59.35], [-113.0, 59.25], [-113.25, 59.35], [-113.5, 59.25], [-114.03, 59.47], [-114.18, 59.82], [-114.25, 59.85], [-114.5, 59.75], [-115.03, 59.97], [-115.25, 60.5]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.W.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-06-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-114.5, 59.75], [-115.03, 59.97], [-115.25, 60.5], [-115.03, 61.03], [-114.5, 61.25], [-114.25, 61.15], [-114.18, 61.18], [-114.03, 61.53], [-113.5, 61.75], [-113.25, 61.65], [-113.0, 61.75], [-112.75, 61.65], [-112.5, 61.75], [-112.25, 61.65], [-112.0, 61.75], [-111.75, 61.65], [-111.5, 61.75], [-111.25, 61.65], [-111.18, 61.68], [-111.03, 62.03], [-110.5, 62.25], [-109.97, 62.03], [-109.75, 61.5], [-109.85, 61.25], [-109.82, 61.18], [-109.75, 61.15], [-109.5, 61.25], [-109.25, 61.15], [-109.0, 61.25], [-108.47, 61.03], [-108.32, 60.68], [-108.25, 60.65], [-108.0, 60.75], [-107.47, 60.53], [-107.32, 60.18], [-107.25, 60.15], [-107.0, 60.25], [-106.47, 60.03], [-106.25, 59.5], [-106.47, 58.97], [-107.0, 58.75], [-107.25, 58.85], [-107.5, 58.75], [-108.03, 58.97], [-108.18, 59.32], [-108.25, 59.35], [-108.5, 59.25], [-108.75, 59.35], [-109.0, 59.25], [-109.25, 59.35], [-109.5, 59.25], [-109.75, 59.35], [-110.0, 59.25], [-110.25, 59.35], [-110.5, 59.25], [-110.75, 59.35], [-111.0, 59.25], [-111.25, 59.35], [-111.5, 59.25], [-111.75, 59.35], [-112.0, 59.25], [-112.25, 59.35], [-112.5, 59.25], [-112.75, 59.35], [-113.0, 59.25], [-113.25, 59.35], [-113.5, 59.25], [-114.03, 59.47], [-114.18, 59.82], [-114.25, 59.85], [-114.5, 59.75]]]]}, "2025-06-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-114.5, 59.75], [-115.03, 59.97], [-115.25, 60.5], [-115.03, 61.03], [-114.5, 61.25], [-114.25, 61.15], [-114.18, 61.18], [-114.03, 61.53], [-113.5, 61.75], [-113.25, 61.65], [-113.0, 61.75], [-112.75, 61.65], [-112.5, 61.75], [-112.25, 61.65], [-112.0, 61.75], [-111.75, 61.65], [-111.5, 61.75], [-111.25, 61.65], [-111.18, 61.68], [-111.03, 62.03], [-110.5, 62.25], [-109.97, 62.03], [-109.75, 61.5], [-109.85, 61.25], [-109.82, 61.18], [-109.75, 61.15], [-109.5, 61.25], [-109.25, 61.15], [-109.0, 61.25], [-108.47, 61.03], [-108.32, 60.68], [-108.25, 60.65], [-108.0, 60.75], [-107.47, 60.53], [-107.32, 60.18], [-107.25, 60.15], [-107.0, 60.25], [-106.47, 60.03], [-106.25, 59.5], [-106.47, 58.97], [-107.0, 58.75], [-107.25, 58.85], [-107.5, 58.75], [-108.03, 58.97], [-108.18, 59.32], [-108.25, 59.35], [-108.5, 59.25], [-108.75, 59.35], [-109.0, 59.25], [-109.25, 59.35], [-109.5, 59.25], [-109.75, 59.35], [-110.0, 59.25], [-110.25, 59.35], [-110.5, 59.25], [-110.75, 59.35], [-111.0, 59.25], [-111.25, 59.35], [-111.5, 59.25], [-111.75, 59.35], [-112.0, 59.25], [-112.25, 59.35], [-112.5, 59.25], [-112.75, 59.35], [-113.0, 59.25], [-113.25, 59.35], [-113.5, 59.25], [-114.03, 59.47], [-114.18, 59.82], [-114.25, 59.85], [-114.5, 59.75]]]]}, "2025-06-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-114.5, 59.75], [-115.03, 59.97], [-115.25, 60.5], [-115.03, 61.03], [-114.5, 61.25], [-114.25, 61.15], [-114.18, 61.18], [-114.03, 61.53], [-113.5, 61.75], [-113.25, 61.65], [-113.0, 61.75], [-112.75, 61.65], [-112.5, 61.75], [-112.25, 61.65], [-112.0, 61.75], [-111.75, 61.65], [-111.5, 61.75], [-111.25, 61.65], [-111.18, 61.68], [-111.03, 62.03], [-110.5, 62.25], [-109.97, 62.03], [-109.75, 61.5], [-109.85, 61.25], [-109.82, 61.18], [-109.75, 61.15], [-109.5, 61.25], [-109.25, 61.15], [-109.0, 61.25], [-108.47, 61.03], [-108.32, 60.68], [-108.25, 60.65], [-108.0, 60.75], [-107.47, 60.53], [-107.32, 60.18], [-107.25, 60.15], [-107.0, 60.25], [-106.47, 60.03], [-106.25, 59.5], [-106.47, 58.97], [-107.0, 58.75], [-107.25, 58.85], [-107.5, 58.75], [-108.03, 58.97], [-108.18, 59.32], [-108.25, 59.35], [-108.5, 59.25], [-108.75, 59.35], [-109.0, 59.25], [-109.25, 59.35], [-109.5, 59.25], [-109.75, 59.35], [-110.0, 59.25], [-110.25, 59.35], [-110.5, 59.25], [-110.75, 59.35], [-111.0, 59.25], [-111.25, 59.35], [-111.5, 59.25], [-111.75, 59.35], [-112.0, 59.25], [-112.25, 59.35], [-112.5, 59.25], [-112.75, 59.35], [-113.0, 59.25], [-113.25, 59.35], [-113.5, 59.25], [-114.03, 59.47], [-114.18, 59.82], [-114.25, 59.85], [-114.5, 59.75]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -8.614983111355514}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -6.497559697632125}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [9.525910426121186, 7.670416768391931, 9.324767797133575]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [6.2146837870280365, 6.146613057454431, 7.133454895019554]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.749001491831266, -7.660282106022506, -6.083395495042605]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-7.057594953522084, -8.614983111355514, -7.236594910644158]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4679503083156544, -1.9445456869220885, -1.5533477141287868]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.7271927859947922, -2.149920979580379, -1.8206684819156393]}}