{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:04:29.216897", "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-Apr-26_to_2025-Apr-28_242.0_35.0"}, "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": 2025040000634}, "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 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 28 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": 58641.674234225764}, "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": ["Mexico", "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": 35.0}, "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": 242.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "242.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 241.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 245.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 32.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 35.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-119.0, 36.25], [-118.5, 36.04], [-118.0, 36.25], [-117.75, 36.15], [-117.5, 36.25], [-117.25, 36.15], [-117.0, 36.25], [-116.75, 36.15], [-116.5, 36.25], [-116.25, 36.15], [-116.0, 36.25], [-115.47, 36.03], [-115.25, 35.5], [-115.35, 35.25], [-115.25, 35.0], [-115.35, 34.75], [-115.32, 34.68], [-114.97, 34.53], [-114.75, 34.0], [-114.85, 33.75], [-114.82, 33.68], [-114.47, 33.53], [-114.25, 33.0], [-114.47, 32.47], [-114.87, 32.3], [-114.75, 32.0], [-114.97, 31.47], [-115.5, 31.25], [-116.03, 31.47], [-116.18, 31.82], [-116.53, 31.97], [-116.75, 32.5], [-116.65, 32.75], [-116.75, 33.0], [-116.65, 33.25], [-116.75, 33.5], [-116.62, 33.8], [-117.03, 33.97], [-117.18, 34.32], [-117.25, 34.35], [-117.5, 34.25], [-117.75, 34.35], [-118.0, 34.25], [-118.25, 34.35], [-118.5, 34.25], [-118.75, 34.35], [-119.0, 34.25], [-119.53, 34.47], [-119.75, 35.0], [-119.65, 35.25], [-119.75, 35.5], [-119.53, 36.03], [-119.0, 36.25]]]]}}, "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": {"2025-04-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-119.75, 35.5], [-119.53, 36.03], [-119.0, 36.25], [-118.5, 36.04], [-118.0, 36.25], [-117.75, 36.15], [-117.5, 36.25], [-117.25, 36.15], [-117.0, 36.25], [-116.75, 36.15], [-116.5, 36.25], [-116.25, 36.15], [-116.0, 36.25], [-115.47, 36.03], [-115.25, 35.5], [-115.35, 35.25], [-115.25, 35.0], [-115.35, 34.75], [-115.32, 34.68], [-114.97, 34.53], [-114.75, 34.0], [-114.85, 33.75], [-114.82, 33.68], [-114.47, 33.53], [-114.25, 33.0], [-114.47, 32.47], [-114.87, 32.3], [-114.75, 32.0], [-114.97, 31.47], [-115.5, 31.25], [-116.03, 31.47], [-116.18, 31.82], [-116.53, 31.97], [-116.75, 32.5], [-116.65, 32.75], [-116.75, 33.0], [-116.65, 33.25], [-116.75, 33.5], [-116.62, 33.8], [-117.03, 33.97], [-117.18, 34.32], [-117.25, 34.35], [-117.5, 34.25], [-117.75, 34.35], [-118.0, 34.25], [-118.25, 34.35], [-118.5, 34.25], [-118.75, 34.35], [-119.0, 34.25], [-119.53, 34.47], [-119.75, 35.0], [-119.65, 35.25], [-119.75, 35.5]]]]}, "2025-04-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-119.75, 35.5], [-119.53, 36.03], [-119.0, 36.25], [-118.5, 36.04], [-118.0, 36.25], [-117.75, 36.15], [-117.5, 36.25], [-117.25, 36.15], [-117.0, 36.25], [-116.75, 36.15], [-116.5, 36.25], [-116.25, 36.15], [-116.0, 36.25], [-115.47, 36.03], [-115.25, 35.5], [-115.35, 35.25], [-115.25, 35.0], [-115.35, 34.75], [-115.32, 34.68], [-114.97, 34.53], [-114.75, 34.0], [-114.85, 33.75], [-114.82, 33.68], [-114.47, 33.53], [-114.25, 33.0], [-114.47, 32.47], [-114.87, 32.3], [-114.75, 32.0], [-114.97, 31.47], [-115.5, 31.25], [-116.03, 31.47], [-116.18, 31.82], [-116.53, 31.97], [-116.75, 32.5], [-116.65, 32.75], [-116.75, 33.0], [-116.65, 33.25], [-116.75, 33.5], [-116.62, 33.8], [-117.03, 33.97], [-117.18, 34.32], [-117.25, 34.35], [-117.5, 34.25], [-117.75, 34.35], [-118.0, 34.25], [-118.25, 34.35], [-118.5, 34.25], [-118.75, 34.35], [-119.0, 34.25], [-119.53, 34.47], [-119.75, 35.0], [-119.65, 35.25], [-119.75, 35.5]]]]}, "2025-04-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-119.75, 35.5], [-119.53, 36.03], [-119.0, 36.25], [-118.5, 36.04], [-118.0, 36.25], [-117.75, 36.15], [-117.5, 36.25], [-117.25, 36.15], [-117.0, 36.25], [-116.75, 36.15], [-116.5, 36.25], [-116.25, 36.15], [-116.0, 36.25], [-115.47, 36.03], [-115.25, 35.5], [-115.35, 35.25], [-115.25, 35.0], [-115.35, 34.75], [-115.32, 34.68], [-114.97, 34.53], [-114.75, 34.0], [-114.85, 33.75], [-114.82, 33.68], [-114.47, 33.53], [-114.25, 33.0], [-114.47, 32.47], [-114.87, 32.3], [-114.75, 32.0], [-114.97, 31.47], [-115.5, 31.25], [-116.03, 31.47], [-116.18, 31.82], [-116.53, 31.97], [-116.75, 32.5], [-116.65, 32.75], [-116.75, 33.0], [-116.65, 33.25], [-116.75, 33.5], [-116.62, 33.8], [-117.03, 33.97], [-117.18, 34.32], [-117.25, 34.35], [-117.5, 34.25], [-117.75, 34.35], [-118.0, 34.25], [-118.25, 34.35], [-118.5, 34.25], [-118.75, 34.35], [-119.0, 34.25], [-119.53, 34.47], [-119.75, 35.0], [-119.65, 35.25], [-119.75, 35.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -8.917916500807848}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -6.429648135401808}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [14.1595935323964, 12.759945888795755, 14.87493745002189]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [7.13580220540365, 6.652435557047568, 8.427958424886071]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.977461167242391, -7.594901453387192, -5.7165817855758405]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-7.364942916232735, -8.917916500807848, -6.27922528510652]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5509879183204014, -1.946475363913464, -1.437540987379857]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.915540920773445, -2.149311781403199, -1.6179969103381215]}}