{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-05-20 10:52:28.761706", "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": "2026-Apr-19_to_2026-Apr-21_259.5_27.5"}, "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": 2026040000569}, "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 19 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 21 2026"}, "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": 337099.84657981707}, "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"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["C.North-America", "N.Central-America"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["North 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": 27.5}, "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": 259.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "259.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 256.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 263.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 25.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 32.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-04-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-103.18, 30.68], [-103.03, 31.03], [-102.68, 31.18], [-102.53, 31.53], [-102.0, 31.75], [-101.75, 31.65], [-101.5, 31.75], [-101.25, 31.65], [-101.18, 31.68], [-101.03, 32.03], [-100.68, 32.18], [-100.53, 32.53], [-100.0, 32.75], [-99.75, 32.65], [-99.68, 32.68], [-99.53, 33.03], [-99.0, 33.25], [-98.75, 33.15], [-98.5, 33.25], [-98.25, 33.15], [-98.0, 33.25], [-97.75, 33.15], [-97.5, 33.25], [-96.97, 33.03], [-96.75, 32.5], [-96.85, 32.25], [-96.75, 32.0], [-96.85, 31.75], [-96.75, 31.5], [-96.85, 31.25], [-96.82, 31.18], [-96.47, 31.03], [-96.32, 30.68], [-95.97, 30.53], [-95.75, 30.0], [-95.85, 29.75], [-95.75, 29.5], [-95.97, 28.97], [-96.5, 28.75], [-96.75, 28.85], [-97.0, 28.75], [-97.25, 28.85], [-97.32, 28.82], [-97.35, 28.75], [-97.25, 28.5], [-97.47, 27.97], [-98.0, 27.75], [-98.25, 27.85], [-98.37, 27.8], [-98.25, 27.5], [-98.35, 27.25], [-98.25, 27.0], [-98.35, 26.75], [-98.25, 26.5], [-98.35, 26.25], [-98.25, 26.0], [-98.47, 25.47], [-98.82, 25.32], [-98.97, 24.97], [-99.5, 24.75], [-99.75, 24.85], [-100.0, 24.75], [-100.53, 24.97], [-100.68, 25.32], [-100.75, 25.35], [-100.82, 25.32], [-100.97, 24.97], [-101.5, 24.75], [-102.03, 24.97], [-102.25, 25.5], [-102.15, 25.75], [-102.18, 25.82], [-102.53, 25.97], [-102.75, 26.5], [-102.65, 26.75], [-102.75, 27.0], [-102.65, 27.25], [-102.68, 27.32], [-102.75, 27.35], [-103.0, 27.25], [-103.53, 27.47], [-103.75, 28.0], [-103.65, 28.25], [-103.75, 28.5], [-103.62, 28.8], [-104.03, 28.97], [-104.25, 29.5], [-104.03, 30.03], [-103.68, 30.18], [-103.53, 30.53], [-103.18, 30.68]]]]}, "2026-04-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-103.18, 30.68], [-103.03, 31.03], [-102.68, 31.18], [-102.53, 31.53], [-102.0, 31.75], [-101.75, 31.65], [-101.5, 31.75], [-101.25, 31.65], [-101.18, 31.68], [-101.03, 32.03], [-100.68, 32.18], [-100.53, 32.53], [-100.0, 32.75], [-99.75, 32.65], [-99.68, 32.68], [-99.53, 33.03], [-99.0, 33.25], [-98.75, 33.15], [-98.5, 33.25], [-98.25, 33.15], [-98.0, 33.25], [-97.75, 33.15], [-97.5, 33.25], [-96.97, 33.03], [-96.75, 32.5], [-96.85, 32.25], [-96.75, 32.0], [-96.85, 31.75], [-96.75, 31.5], [-96.85, 31.25], [-96.82, 31.18], [-96.47, 31.03], [-96.32, 30.68], [-95.97, 30.53], [-95.75, 30.0], [-95.85, 29.75], [-95.75, 29.5], [-95.97, 28.97], [-96.5, 28.75], [-96.75, 28.85], [-97.0, 28.75], [-97.25, 28.85], [-97.32, 28.82], [-97.35, 28.75], [-97.25, 28.5], [-97.47, 27.97], [-98.0, 27.75], [-98.25, 27.85], [-98.37, 27.8], [-98.25, 27.5], [-98.35, 27.25], [-98.25, 27.0], [-98.35, 26.75], [-98.25, 26.5], [-98.35, 26.25], [-98.25, 26.0], [-98.47, 25.47], [-98.82, 25.32], [-98.97, 24.97], [-99.5, 24.75], [-99.75, 24.85], [-100.0, 24.75], [-100.53, 24.97], [-100.68, 25.32], [-100.75, 25.35], [-100.82, 25.32], [-100.97, 24.97], [-101.5, 24.75], [-102.03, 24.97], [-102.25, 25.5], [-102.15, 25.75], [-102.18, 25.82], [-102.53, 25.97], [-102.75, 26.5], [-102.65, 26.75], [-102.75, 27.0], [-102.65, 27.25], [-102.68, 27.32], [-102.75, 27.35], [-103.0, 27.25], [-103.53, 27.47], [-103.75, 28.0], [-103.65, 28.25], [-103.75, 28.5], [-103.62, 28.8], [-104.03, 28.97], [-104.25, 29.5], [-104.03, 30.03], [-103.68, 30.18], [-103.53, 30.53], [-103.18, 30.68]]]]}, "2026-04-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-103.18, 30.68], [-103.03, 31.03], [-102.68, 31.18], [-102.53, 31.53], [-102.0, 31.75], [-101.75, 31.65], [-101.5, 31.75], [-101.25, 31.65], [-101.18, 31.68], [-101.03, 32.03], [-100.68, 32.18], [-100.53, 32.53], [-100.0, 32.75], [-99.75, 32.65], [-99.68, 32.68], [-99.53, 33.03], [-99.0, 33.25], [-98.75, 33.15], [-98.5, 33.25], [-98.25, 33.15], [-98.0, 33.25], [-97.75, 33.15], [-97.5, 33.25], [-96.97, 33.03], [-96.75, 32.5], [-96.85, 32.25], [-96.75, 32.0], [-96.85, 31.75], [-96.75, 31.5], [-96.85, 31.25], [-96.82, 31.18], [-96.47, 31.03], [-96.32, 30.68], [-95.97, 30.53], [-95.75, 30.0], [-95.85, 29.75], [-95.75, 29.5], [-95.97, 28.97], [-96.5, 28.75], [-96.75, 28.85], [-97.0, 28.75], [-97.25, 28.85], [-97.32, 28.82], [-97.35, 28.75], [-97.25, 28.5], [-97.47, 27.97], [-98.0, 27.75], [-98.25, 27.85], [-98.37, 27.8], [-98.25, 27.5], [-98.35, 27.25], [-98.25, 27.0], [-98.35, 26.75], [-98.25, 26.5], [-98.35, 26.25], [-98.25, 26.0], [-98.47, 25.47], [-98.82, 25.32], [-98.97, 24.97], [-99.5, 24.75], [-99.75, 24.85], [-100.0, 24.75], [-100.53, 24.97], [-100.68, 25.32], [-100.75, 25.35], [-100.82, 25.32], [-100.97, 24.97], [-101.5, 24.75], [-102.03, 24.97], [-102.25, 25.5], [-102.15, 25.75], [-102.18, 25.82], [-102.53, 25.97], [-102.75, 26.5], [-102.65, 26.75], [-102.75, 27.0], [-102.65, 27.25], [-102.68, 27.32], [-102.75, 27.35], [-103.0, 27.25], [-103.53, 27.47], [-103.75, 28.0], [-103.65, 28.25], [-103.75, 28.5], [-103.62, 28.8], [-104.03, 28.97], [-104.25, 29.5], [-104.03, 30.03], [-103.68, 30.18], [-103.53, 30.53], [-103.18, 30.68]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -13.790344143111213}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -7.898258639921903}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [12.880254069010448, 13.158870290120376, 16.738319956461567]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [9.575606282552087, 10.192210133870446, 14.048121388753259]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-9.015925953236458, -9.041560129806596, -5.637289836722657]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-13.117331988123738, -13.790344143111213, -7.812705099652817]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-2.7716852061627075, -2.9149418295668967, -1.8059654163210608]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-3.7425853580530988, -4.159547011948868, -2.4952036413609635]}}