{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:04:57.883917", "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-May-05_to_2025-May-07_248.0_33.5"}, "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": 2025050000175}, "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": "May 05 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 07 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": 53443.49702702646}, "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": ["United States"]}, "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": 33.5}, "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": 248.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "248.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 245.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 248.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 33.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 36.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-115.53, 35.53], [-115.18, 35.68], [-115.15, 35.75], [-115.25, 36.0], [-115.15, 36.25], [-115.25, 36.5], [-115.03, 37.03], [-114.5, 37.25], [-113.97, 37.03], [-113.82, 36.68], [-113.47, 36.53], [-113.25, 36.0], [-113.35, 35.75], [-113.25, 35.5], [-113.35, 35.25], [-113.32, 35.18], [-113.25, 35.15], [-113.0, 35.25], [-112.47, 35.03], [-112.32, 34.68], [-111.97, 34.53], [-111.82, 34.18], [-111.47, 34.03], [-111.25, 33.5], [-111.35, 33.25], [-111.25, 33.0], [-111.47, 32.47], [-112.0, 32.25], [-112.53, 32.47], [-112.68, 32.82], [-113.0, 32.96], [-113.5, 32.75], [-114.03, 32.97], [-114.18, 33.32], [-114.25, 33.35], [-114.5, 33.25], [-115.03, 33.47], [-115.25, 34.0], [-115.15, 34.25], [-115.18, 34.32], [-115.53, 34.47], [-115.75, 35.0], [-115.53, 35.53]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.North-America", "N.Central-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-05-05T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-115.53, 34.47], [-115.75, 35.0], [-115.53, 35.53], [-115.18, 35.68], [-115.15, 35.75], [-115.25, 36.0], [-115.15, 36.25], [-115.25, 36.5], [-115.03, 37.03], [-114.5, 37.25], [-113.97, 37.03], [-113.82, 36.68], [-113.47, 36.53], [-113.25, 36.0], [-113.35, 35.75], [-113.25, 35.5], [-113.35, 35.25], [-113.32, 35.18], [-113.25, 35.15], [-113.0, 35.25], [-112.47, 35.03], [-112.32, 34.68], [-111.97, 34.53], [-111.82, 34.18], [-111.47, 34.03], [-111.25, 33.5], [-111.35, 33.25], [-111.25, 33.0], [-111.47, 32.47], [-112.0, 32.25], [-112.53, 32.47], [-112.68, 32.82], [-113.0, 32.96], [-113.5, 32.75], [-114.03, 32.97], [-114.18, 33.32], [-114.25, 33.35], [-114.5, 33.25], [-115.03, 33.47], [-115.25, 34.0], [-115.15, 34.25], [-115.18, 34.32], [-115.53, 34.47]]]]}, "2025-05-06T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-115.53, 34.47], [-115.75, 35.0], [-115.53, 35.53], [-115.18, 35.68], [-115.15, 35.75], [-115.25, 36.0], [-115.15, 36.25], [-115.25, 36.5], [-115.03, 37.03], [-114.5, 37.25], [-113.97, 37.03], [-113.82, 36.68], [-113.47, 36.53], [-113.25, 36.0], [-113.35, 35.75], [-113.25, 35.5], [-113.35, 35.25], [-113.32, 35.18], [-113.25, 35.15], [-113.0, 35.25], [-112.47, 35.03], [-112.32, 34.68], [-111.97, 34.53], [-111.82, 34.18], [-111.47, 34.03], [-111.25, 33.5], [-111.35, 33.25], [-111.25, 33.0], [-111.47, 32.47], [-112.0, 32.25], [-112.53, 32.47], [-112.68, 32.82], [-113.0, 32.96], [-113.5, 32.75], [-114.03, 32.97], [-114.18, 33.32], [-114.25, 33.35], [-114.5, 33.25], [-115.03, 33.47], [-115.25, 34.0], [-115.15, 34.25], [-115.18, 34.32], [-115.53, 34.47]]]]}, "2025-05-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-115.53, 34.47], [-115.75, 35.0], [-115.53, 35.53], [-115.18, 35.68], [-115.15, 35.75], [-115.25, 36.0], [-115.15, 36.25], [-115.25, 36.5], [-115.03, 37.03], [-114.5, 37.25], [-113.97, 37.03], [-113.82, 36.68], [-113.47, 36.53], [-113.25, 36.0], [-113.35, 35.75], [-113.25, 35.5], [-113.35, 35.25], [-113.32, 35.18], [-113.25, 35.15], [-113.0, 35.25], [-112.47, 35.03], [-112.32, 34.68], [-111.97, 34.53], [-111.82, 34.18], [-111.47, 34.03], [-111.25, 33.5], [-111.35, 33.25], [-111.25, 33.0], [-111.47, 32.47], [-112.0, 32.25], [-112.53, 32.47], [-112.68, 32.82], [-113.0, 32.96], [-113.5, 32.75], [-114.03, 32.97], [-114.18, 33.32], [-114.25, 33.35], [-114.5, 33.25], [-115.03, 33.47], [-115.25, 34.0], [-115.15, 34.25], [-115.18, 34.32], [-115.53, 34.47]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -7.943745915570162}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -6.7261115939728375}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [15.840109822106797, 16.346438707624202, 17.93636329287574]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [11.912127431233728, 12.331034596761071, 13.795831298828148]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-7.4931068430420495, -7.094152991537702, -5.59107494733876]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-7.943745915570162, -7.784367825597769, -6.3136857351993285]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-2.0693294686525485, -1.9151595683088412, -1.44727978678872]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.3766553094643017, -2.2603724048861493, -1.5854524538333588]}}