{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:16:10.337151", "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": "2021-Dec-15_to_2021-Dec-21_242.5_37.5"}, "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": 2021120000590}, "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": "December 15 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 21 2021"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 7}, "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": 112060.48220025716}, "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": 37.5}, "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": 242.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "242.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 241.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 247.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 36.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 40.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-117.75, 39.15], [-117.5, 39.25], [-116.97, 39.03], [-116.82, 38.68], [-116.75, 38.65], [-116.68, 38.68], [-116.65, 38.75], [-116.75, 39.0], [-116.53, 39.53], [-116.0, 39.75], [-115.75, 39.65], [-115.5, 39.75], [-114.97, 39.53], [-114.8, 39.13], [-114.68, 39.18], [-114.54, 39.5], [-114.68, 39.82], [-115.03, 39.97], [-115.25, 40.5], [-115.03, 41.03], [-114.5, 41.25], [-114.25, 41.15], [-114.0, 41.25], [-113.47, 41.03], [-113.25, 40.5], [-113.35, 40.25], [-113.32, 40.18], [-112.97, 40.03], [-112.82, 39.68], [-112.47, 39.53], [-112.25, 39.0], [-112.35, 38.75], [-112.25, 38.5], [-112.35, 38.25], [-112.25, 38.0], [-112.47, 37.47], [-113.0, 37.25], [-113.25, 37.35], [-113.5, 37.25], [-114.0, 37.46], [-114.5, 37.25], [-114.75, 37.35], [-114.82, 37.32], [-114.85, 37.25], [-114.75, 37.0], [-114.97, 36.47], [-115.5, 36.25], [-115.75, 36.35], [-115.87, 36.3], [-115.75, 36.0], [-115.97, 35.47], [-116.5, 35.25], [-116.75, 35.35], [-117.0, 35.25], [-117.25, 35.35], [-117.5, 35.25], [-117.75, 35.35], [-118.0, 35.25], [-118.53, 35.47], [-118.75, 36.0], [-118.53, 36.53], [-118.18, 36.68], [-118.15, 36.75], [-118.18, 36.82], [-118.53, 36.97], [-118.68, 37.32], [-119.03, 37.47], [-119.25, 38.0], [-119.15, 38.25], [-119.25, 38.5], [-119.03, 39.03], [-118.5, 39.25], [-118.25, 39.15], [-118.0, 39.25], [-117.75, 39.15]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-12-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-118.75, 38.0], [-118.65, 38.25], [-118.75, 38.5], [-118.53, 39.03], [-118.0, 39.25], [-117.75, 39.15], [-117.5, 39.25], [-116.97, 39.03], [-116.82, 38.68], [-116.75, 38.65], [-116.68, 38.68], [-116.65, 38.75], [-116.75, 39.0], [-116.53, 39.53], [-116.0, 39.75], [-115.47, 39.53], [-115.25, 39.0], [-115.35, 38.75], [-115.32, 38.68], [-114.97, 38.53], [-114.75, 38.0], [-114.85, 37.75], [-114.75, 37.5], [-114.97, 36.97], [-115.32, 36.82], [-115.47, 36.47], [-115.87, 36.3], [-115.75, 36.0], [-115.97, 35.47], [-116.5, 35.25], [-116.75, 35.35], [-117.0, 35.25], [-117.25, 35.35], [-117.5, 35.25], [-117.75, 35.35], [-118.0, 35.25], [-118.53, 35.47], [-118.75, 36.0], [-118.53, 36.53], [-118.18, 36.68], [-118.15, 36.75], [-118.18, 36.82], [-118.53, 36.97], [-118.75, 37.5], [-118.65, 37.75], [-118.75, 38.0]]]]}, "2021-12-16T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-118.75, 38.0], [-118.65, 38.25], [-118.75, 38.5], [-118.53, 39.03], [-118.0, 39.25], [-117.75, 39.15], [-117.5, 39.25], [-116.97, 39.03], [-116.82, 38.68], [-116.75, 38.65], [-116.68, 38.68], [-116.65, 38.75], [-116.75, 39.0], [-116.53, 39.53], [-116.0, 39.75], [-115.75, 39.65], [-115.5, 39.75], [-114.97, 39.53], [-114.80000000000001, 39.13], [-114.68, 39.18], [-114.53, 39.53], [-114.18, 39.68], [-114.03, 40.03], [-113.5, 40.25], [-112.97, 40.03], [-112.82, 39.68], [-112.47, 39.53], [-112.25, 39.0], [-112.46000000000001, 38.5], [-112.25, 38.0], [-112.47, 37.47], [-113.0, 37.25], [-113.25, 37.35], [-113.5, 37.25], [-114.0, 37.46], [-114.5, 37.25], [-114.80000000000001, 37.38], [-114.85, 37.25], [-114.75, 37.0], [-114.97, 36.47], [-115.5, 36.25], [-115.75, 36.35], [-115.87, 36.3], [-115.75, 36.0], [-115.97, 35.47], [-116.5, 35.25], [-116.75, 35.35], [-117.0, 35.25], [-117.25, 35.35], [-117.5, 35.25], [-117.75, 35.35], [-118.0, 35.25], [-118.53, 35.47], [-118.75, 36.0], [-118.53, 36.53], [-118.18, 36.68], [-118.15, 36.75], [-118.18, 36.82], [-118.53, 36.97], [-118.75, 37.5], [-118.65, 37.75], [-118.75, 38.0]]]]}, "2021-12-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-119.25, 38.5], [-119.03, 39.03], [-118.5, 39.25], [-118.25, 39.15], [-118.0, 39.25], [-117.75, 39.15], [-117.5, 39.25], [-116.97, 39.03], [-116.82, 38.68], [-116.75, 38.65], [-116.68, 38.68], [-116.65, 38.75], [-116.75, 39.0], [-116.53, 39.53], [-116.0, 39.75], [-115.75, 39.65], [-115.5, 39.75], [-114.97, 39.53], [-114.80000000000001, 39.13], [-114.68, 39.18], [-114.53999999999999, 39.5], [-114.68, 39.82], [-115.03, 39.97], [-115.25, 40.5], [-115.03, 41.03], [-114.5, 41.25], [-114.25, 41.15], [-114.0, 41.25], [-113.47, 41.03], [-113.25, 40.5], [-113.35, 40.25], [-113.32, 40.18], [-112.97, 40.03], [-112.82, 39.68], [-112.47, 39.53], [-112.25, 39.0], [-112.35, 38.75], [-112.25, 38.5], [-112.35, 38.25], [-112.25, 38.0], [-112.47, 37.47], [-113.0, 37.25], [-113.25, 37.35], [-113.5, 37.25], [-114.0, 37.46], [-114.5, 37.25], [-114.75, 37.35], [-114.82, 37.32], [-114.85, 37.25], [-114.75, 37.0], [-114.97, 36.47], [-115.5, 36.25], [-115.75, 36.35], [-115.87, 36.3], [-115.75, 36.0], [-115.97, 35.47], [-116.5, 35.25], [-116.75, 35.35], [-117.0, 35.25], [-117.25, 35.35], [-117.5, 35.25], [-117.75, 35.35], [-118.0, 35.25], [-118.53, 35.47], [-118.75, 36.0], [-118.53, 36.53], [-118.18, 36.68], [-118.15, 36.75], [-118.18, 36.82], [-118.53, 36.97], [-118.68, 37.32], [-119.03, 37.47], [-119.25, 38.0], [-119.15, 38.25], [-119.25, 38.5]]]]}, "2021-12-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-119.25, 38.5], [-119.03, 39.03], [-118.5, 39.25], [-118.25, 39.15], [-118.0, 39.25], [-117.75, 39.15], [-117.5, 39.25], [-116.97, 39.03], [-116.82, 38.68], [-116.75, 38.65], [-116.68, 38.68], [-116.65, 38.75], [-116.75, 39.0], [-116.53, 39.53], [-116.0, 39.75], [-115.75, 39.65], [-115.5, 39.75], [-114.97, 39.53], [-114.80000000000001, 39.13], [-114.68, 39.18], [-114.53999999999999, 39.5], [-114.68, 39.82], [-115.03, 39.97], [-115.25, 40.5], [-115.03, 41.03], [-114.5, 41.25], [-114.25, 41.15], [-114.0, 41.25], [-113.47, 41.03], [-113.25, 40.5], [-113.35, 40.25], [-113.32, 40.18], [-112.97, 40.03], [-112.82, 39.68], [-112.47, 39.53], [-112.25, 39.0], [-112.35, 38.75], [-112.25, 38.5], [-112.35, 38.25], [-112.25, 38.0], [-112.47, 37.47], [-113.0, 37.25], [-113.25, 37.35], [-113.5, 37.25], [-114.0, 37.46], [-114.5, 37.25], [-114.75, 37.35], [-114.82, 37.32], [-114.85, 37.25], [-114.75, 37.0], [-114.97, 36.47], [-115.5, 36.25], [-115.75, 36.35], [-116.0, 36.25], [-116.25, 36.35], [-116.32, 36.32], [-116.47, 35.97], [-117.0, 35.75], [-117.30000000000001, 35.88], [-117.47, 35.47], [-118.0, 35.25], [-118.53, 35.47], [-118.75, 36.0], [-118.53, 36.53], [-118.12, 36.7], [-118.18, 36.82], [-118.53, 36.97], [-118.68, 37.32], [-119.03, 37.47], [-119.25, 38.0], [-119.15, 38.25], [-119.25, 38.5]]]]}, "2021-12-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-119.25, 38.5], [-119.03, 39.03], [-118.5, 39.25], [-118.25, 39.15], [-118.0, 39.25], [-117.47, 39.03], [-117.32, 38.68], [-117.25, 38.65], [-117.0, 38.75], [-116.75, 38.65], [-116.68, 38.68], [-116.53, 39.03], [-116.0, 39.25], [-115.75, 39.15], [-115.5, 39.25], [-114.97, 39.03], [-114.82, 38.68], [-114.69999999999999, 38.63], [-114.53, 39.03], [-114.18, 39.18], [-114.15, 39.25], [-114.18, 39.32], [-114.53, 39.47], [-114.68, 39.82], [-115.03, 39.97], [-115.25, 40.5], [-115.03, 41.03], [-114.5, 41.25], [-114.25, 41.15], [-114.0, 41.25], [-113.47, 41.03], [-113.25, 40.5], [-113.35, 40.25], [-113.32, 40.18], [-112.97, 40.03], [-112.82, 39.68], [-112.47, 39.53], [-112.25, 39.0], [-112.35, 38.75], [-112.25, 38.5], [-112.35, 38.25], [-112.25, 38.0], [-112.47, 37.47], [-113.0, 37.25], [-113.53, 37.47], [-113.68, 37.82], [-113.75, 37.85], [-114.0, 37.75], [-114.30000000000001, 37.88], [-114.47, 37.47], [-114.82, 37.32], [-114.85, 37.25], [-114.75, 37.0], [-114.97, 36.47], [-115.5, 36.25], [-115.75, 36.35], [-116.0, 36.25], [-116.25, 36.35], [-116.5, 36.25], [-116.75, 36.35], [-117.0, 36.25], [-117.53, 36.47], [-117.68, 36.82], [-118.03, 36.97], [-118.19999999999999, 37.38], [-118.5, 37.25], [-119.03, 37.47], [-119.25, 38.0], [-119.15, 38.25], [-119.25, 38.5]]]]}, "2021-12-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-119.03, 39.03], [-118.5, 39.25], [-118.25, 39.15], [-118.0, 39.25], [-117.47, 39.03], [-117.32, 38.68], [-117.25, 38.65], [-117.0, 38.75], [-116.75, 38.65], [-116.68, 38.68], [-116.53, 39.03], [-116.0, 39.25], [-115.75, 39.15], [-115.5, 39.25], [-114.97, 39.03], [-114.75, 38.5], [-114.85, 38.25], [-114.75, 38.0], [-114.85, 37.75], [-114.75, 37.5], [-114.97, 36.97], [-115.32, 36.82], [-115.47, 36.47], [-116.0, 36.25], [-116.25, 36.35], [-116.5, 36.25], [-116.75, 36.35], [-117.0, 36.25], [-117.53, 36.47], [-117.68, 36.82], [-118.03, 36.97], [-118.19999999999999, 37.38], [-118.5, 37.25], [-119.03, 37.47], [-119.25, 38.0], [-119.15, 38.25], [-119.25, 38.5], [-119.03, 39.03]]], [[[-114.18, 39.18], [-114.03, 39.53], [-113.5, 39.75], [-112.97, 39.53], [-112.75, 39.0], [-112.85, 38.75], [-112.75, 38.5], [-112.97, 37.97], [-113.5, 37.75], [-113.75, 37.85], [-114.0, 37.75], [-114.53, 37.97], [-114.75, 38.5], [-114.53, 39.03], [-114.18, 39.18]]]]}, "2021-12-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-118.03, 38.03], [-117.5, 38.25], [-116.97, 38.03], [-116.75, 37.5], [-116.97, 36.97], [-117.5, 36.75], [-118.03, 36.97], [-118.25, 37.5], [-118.03, 38.03]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -12.568114554278225}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -7.591669247806093}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-3.809421555994618, -6.60704064164247, -8.492067816552947, -9.789672978708268, -7.9378281452390524, -7.7704841242047, -7.456447594719123]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-9.17789537437767, -12.416203693653813, -12.967752539331457, -14.768889478121991, -11.69778669341764, -11.440635647310785, -7.456447594719123]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.865939054047988, -7.3854268169801225, -8.514549518621523, -8.826355776663535, -6.806151388898963, -6.800046040277788, -6.384405543515925]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-7.725786531042445, -10.016443105277858, -12.568114554278225, -12.444131695806732, -11.396838613376815, -9.316429416332937, -6.384405543515925]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.664875625324679, -2.0085076585956987, -2.188311985327014, -2.1652417220838798, -1.6161454895967184, -1.587628826208299, -1.5238078801427182]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.1802681354982956, -2.58643355416415, -3.10154798107974, -3.0414937209651556, -2.527355460623688, -2.0458050160341745, -1.5238078801427182]}}