{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:52:28.571036", "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": "2023-Apr-22_to_2023-Apr-26_261.0_36.5"}, "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": 2023040000798}, "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 22 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 26 2023"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 5}, "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": 65253.39621984718}, "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": 36.5}, "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": 261.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "261.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 258.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 263.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 35.0}, "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": [[[[-101.53, 37.03], [-101.0, 37.25], [-100.75, 37.15], [-100.5, 37.25], [-100.25, 37.15], [-100.0, 37.25], [-99.75, 37.15], [-99.5, 37.25], [-99.25, 37.15], [-99.0, 37.25], [-98.47, 37.03], [-98.32, 36.68], [-97.97, 36.53], [-97.82, 36.18], [-97.47, 36.03], [-97.32, 35.68], [-97.25, 35.65], [-97.0, 35.75], [-96.47, 35.53], [-96.25, 35.0], [-96.47, 34.47], [-97.0, 34.25], [-97.25, 34.35], [-97.5, 34.25], [-98.03, 34.47], [-98.18, 34.82], [-98.25, 34.85], [-98.32, 34.82], [-98.47, 34.47], [-99.0, 34.25], [-99.25, 34.35], [-99.5, 34.25], [-99.75, 34.35], [-100.0, 34.25], [-100.25, 34.35], [-100.5, 34.25], [-101.03, 34.47], [-101.18, 34.82], [-101.25, 34.85], [-101.5, 34.75], [-102.03, 34.97], [-102.25, 35.5], [-102.15, 35.75], [-102.25, 36.0], [-102.03, 36.53], [-101.68, 36.68], [-101.53, 37.03]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["C.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2023-04-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-102.25, 36.0], [-102.02999999999997, 36.53], [-101.68, 36.68], [-101.52999999999997, 37.03], [-101.0, 37.25], [-100.75, 37.15], [-100.5, 37.25], [-100.25, 37.15], [-100.0, 37.25], [-99.75, 37.15], [-99.5, 37.25], [-99.25, 37.15], [-99.0, 37.25], [-98.47000000000003, 37.03], [-98.32, 36.68], [-97.97000000000003, 36.53], [-97.82, 36.18], [-97.47000000000003, 36.03], [-97.32, 35.68], [-97.25, 35.65], [-97.0, 35.75], [-96.47000000000003, 35.53], [-96.25, 35.0], [-96.47000000000003, 34.47], [-97.0, 34.25], [-97.25, 34.35], [-97.5, 34.25], [-98.02999999999997, 34.47], [-98.18, 34.82], [-98.25, 34.85], [-98.32, 34.82], [-98.47000000000003, 34.47], [-99.0, 34.25], [-99.25, 34.35], [-99.5, 34.25], [-99.75, 34.35], [-100.0, 34.25], [-100.25, 34.35], [-100.5, 34.25], [-101.02999999999997, 34.47], [-101.18, 34.82], [-101.25, 34.85], [-101.5, 34.75], [-102.02999999999997, 34.97], [-102.25, 35.5], [-102.14999999999998, 35.75], [-102.25, 36.0]]]]}, "2023-04-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-102.25, 36.0], [-102.02999999999997, 36.53], [-101.68, 36.68], [-101.52999999999997, 37.03], [-101.0, 37.25], [-100.75, 37.15], [-100.5, 37.25], [-100.25, 37.15], [-100.0, 37.25], [-99.75, 37.15], [-99.5, 37.25], [-99.25, 37.15], [-99.0, 37.25], [-98.47000000000003, 37.03], [-98.32, 36.68], [-97.97000000000003, 36.53], [-97.82, 36.18], [-97.47000000000003, 36.03], [-97.32, 35.68], [-97.25, 35.65], [-97.0, 35.75], [-96.47000000000003, 35.53], [-96.25, 35.0], [-96.47000000000003, 34.47], [-97.0, 34.25], [-97.25, 34.35], [-97.5, 34.25], [-98.02999999999997, 34.47], [-98.18, 34.82], [-98.25, 34.85], [-98.32, 34.82], [-98.47000000000003, 34.47], [-99.0, 34.25], [-99.25, 34.35], [-99.5, 34.25], [-99.75, 34.35], [-100.0, 34.25], [-100.25, 34.35], [-100.5, 34.25], [-101.02999999999997, 34.47], [-101.18, 34.82], [-101.25, 34.85], [-101.5, 34.75], [-102.02999999999997, 34.97], [-102.25, 35.5], [-102.14999999999998, 35.75], [-102.25, 36.0]]]]}, 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35.75], [-102.25, 36.0]]]]}, "2023-04-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-99.5, 35.75], [-100.02999999999997, 35.97], [-100.25, 36.5], [-100.02999999999997, 37.03], [-99.5, 37.25], [-99.25, 37.15], [-99.0, 37.25], [-98.47000000000003, 37.03], [-98.32, 36.68], [-97.97000000000003, 36.53], [-97.75, 36.0], [-97.97000000000003, 35.47], [-98.5, 35.25], [-99.02999999999997, 35.47], [-99.18, 35.82], [-99.25, 35.85], [-99.5, 35.75]]]]}, "2023-04-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-99.5, 35.75], [-100.02999999999997, 35.97], [-100.25, 36.5], [-100.02999999999997, 37.03], [-99.5, 37.25], [-99.25, 37.15], [-99.0, 37.25], [-98.47000000000003, 37.03], [-98.32, 36.68], [-97.97000000000003, 36.53], [-97.75, 36.0], [-97.97000000000003, 35.47], [-98.5, 35.25], [-99.02999999999997, 35.47], [-99.18, 35.82], [-99.25, 35.85], [-99.5, 35.75]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -8.631964262747317}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -6.610173846094052}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [10.020096775493869, 8.194249605783398, 9.266429803007725, 10.295154464379664, 9.102070339096713]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [8.578378619402258, 6.486438255280461, 7.248933595782489, 9.90480050126024, 8.42928611592157]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.814069637644311, -7.657804113967479, -6.502215510497461, -5.3846540018560445, -6.591440083830643]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.63703684870012, -8.631964262747317, -7.843718271483226, -5.638284981413733, -6.8337172573397424]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3868987093412566, -1.8228002973326782, -1.5573938845230644, -1.2769939872810327, -1.539134129909705]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.568779658066278, -2.038963165953023, -1.9044070508102657, -1.3316813615177046, -1.5871499041508168]}}