{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:06:25.690769", "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-Jul-21_to_2025-Jul-23_246.5_49.5"}, "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": 2025070000817}, "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": "July 21 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "July 23 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": 58356.39557331591}, "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": []}, "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": 49.5}, "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": 246.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "246.5\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": 250.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 48.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 50.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-115.03, 50.53], [-114.5, 50.75], [-114.25, 50.65], [-114.0, 50.75], [-113.7, 50.63], [-113.53, 51.03], [-113.0, 51.25], [-112.75, 51.15], [-112.5, 51.25], [-111.97, 51.03], [-111.82, 50.68], [-111.75, 50.65], [-111.5, 50.75], [-111.25, 50.65], [-111.18, 50.68], [-111.03, 51.03], [-110.5, 51.25], [-109.97, 51.03], [-109.75, 50.5], [-109.85, 50.25], [-109.75, 50.0], [-109.97, 49.47], [-110.32, 49.32], [-110.35, 49.25], [-110.32, 49.18], [-110.25, 49.15], [-110.0, 49.25], [-109.47, 49.03], [-109.25, 48.5], [-109.47, 47.97], [-109.82, 47.82], [-109.97, 47.47], [-110.5, 47.25], [-110.75, 47.35], [-111.0, 47.25], [-111.53, 47.47], [-111.75, 48.0], [-111.65, 48.25], [-111.68, 48.32], [-111.75, 48.35], [-111.82, 48.32], [-111.97, 47.97], [-112.5, 47.75], [-113.03, 47.97], [-113.18, 48.32], [-113.25, 48.35], [-113.5, 48.25], [-114.03, 48.47], [-114.18, 48.82], [-114.53, 48.97], [-114.68, 49.32], [-115.03, 49.47], [-115.25, 50.0], [-115.03, 50.53]]]]}}, "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": {"2025-07-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-115.03, 49.47], [-115.25, 50.0], [-115.03, 50.53], [-114.5, 50.75], [-114.25, 50.65], [-114.0, 50.75], [-113.69999999999999, 50.63], [-113.53, 51.03], [-113.0, 51.25], [-112.75, 51.15], [-112.5, 51.25], [-111.97, 51.03], [-111.82, 50.68], [-111.75, 50.65], [-111.5, 50.75], [-111.25, 50.65], [-111.18, 50.68], [-111.03, 51.03], [-110.5, 51.25], [-109.97, 51.03], [-109.75, 50.5], [-109.85, 50.25], [-109.75, 50.0], [-109.97, 49.47], [-110.32, 49.32], [-110.35, 49.25], [-110.32, 49.18], [-110.25, 49.15], [-110.0, 49.25], [-109.47, 49.03], [-109.25, 48.5], [-109.47, 47.97], [-109.82, 47.82], [-109.97, 47.47], [-110.5, 47.25], [-110.75, 47.35], [-111.0, 47.25], [-111.53, 47.47], [-111.75, 48.0], [-111.65, 48.25], [-111.68, 48.32], [-111.75, 48.35], [-111.82, 48.32], [-111.97, 47.97], [-112.5, 47.75], [-113.03, 47.97], [-113.18, 48.32], [-113.25, 48.35], [-113.5, 48.25], [-114.03, 48.47], [-114.18, 48.82], [-114.53, 48.97], [-114.68, 49.32], [-115.03, 49.47]]]]}, "2025-07-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-115.03, 49.47], [-115.25, 50.0], [-115.03, 50.53], [-114.5, 50.75], [-114.25, 50.65], [-114.0, 50.75], [-113.69999999999999, 50.63], [-113.53, 51.03], [-113.0, 51.25], [-112.75, 51.15], [-112.5, 51.25], [-111.97, 51.03], [-111.82, 50.68], [-111.75, 50.65], [-111.5, 50.75], [-111.25, 50.65], [-111.18, 50.68], [-111.03, 51.03], [-110.5, 51.25], [-109.97, 51.03], [-109.75, 50.5], [-109.85, 50.25], [-109.75, 50.0], [-109.97, 49.47], [-110.32, 49.32], [-110.35, 49.25], [-110.32, 49.18], [-110.25, 49.15], [-110.0, 49.25], [-109.47, 49.03], [-109.25, 48.5], [-109.47, 47.97], [-109.82, 47.82], [-109.97, 47.47], [-110.5, 47.25], [-110.75, 47.35], [-111.0, 47.25], [-111.53, 47.47], [-111.75, 48.0], [-111.65, 48.25], [-111.68, 48.32], [-111.75, 48.35], [-111.82, 48.32], [-111.97, 47.97], [-112.5, 47.75], [-113.03, 47.97], [-113.18, 48.32], [-113.25, 48.35], [-113.5, 48.25], [-114.03, 48.47], [-114.18, 48.82], [-114.53, 48.97], [-114.68, 49.32], [-115.03, 49.47]]]]}, "2025-07-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-115.03, 49.47], [-115.25, 50.0], [-115.03, 50.53], [-114.5, 50.75], [-114.25, 50.65], [-114.0, 50.75], [-113.69999999999999, 50.63], [-113.53, 51.03], [-113.0, 51.25], [-112.75, 51.15], [-112.5, 51.25], [-111.97, 51.03], [-111.82, 50.68], [-111.75, 50.65], [-111.5, 50.75], [-111.25, 50.65], [-111.18, 50.68], [-111.03, 51.03], [-110.5, 51.25], [-109.97, 51.03], [-109.75, 50.5], [-109.85, 50.25], [-109.75, 50.0], [-109.97, 49.47], [-110.32, 49.32], [-110.35, 49.25], [-110.32, 49.18], [-110.25, 49.15], [-110.0, 49.25], [-109.47, 49.03], [-109.25, 48.5], [-109.47, 47.97], [-109.82, 47.82], [-109.97, 47.47], [-110.5, 47.25], [-110.75, 47.35], [-111.0, 47.25], [-111.53, 47.47], [-111.75, 48.0], [-111.65, 48.25], [-111.68, 48.32], [-111.75, 48.35], [-111.82, 48.32], [-111.97, 47.97], [-112.5, 47.75], [-113.03, 47.97], [-113.18, 48.32], [-113.25, 48.35], [-113.5, 48.25], [-114.03, 48.47], [-114.18, 48.82], [-114.53, 48.97], [-114.68, 49.32], [-115.03, 49.47]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -7.72574558163933}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.318598990641653}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [15.51710737381859, 13.397611806584564, 13.341042915432013]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [9.622825876871786, 7.69324645996096, 9.466017659505212]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.970636454641451, -5.987859008485322, -5.997301508798185]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.925590475919876, -7.270242230509211, -7.72574558163933]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3023085567124597, -2.0274143403212053, -2.0485553821342113]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5063109025848775, -2.635869621357145, -2.36812141052019]}}