{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:13:34.626086", "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-Sep-25_to_2021-Sep-30_99.5_51.0"}, "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": 2021090000876}, "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": "September 25 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 30 2021"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 6}, "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": 54653.70983075576}, "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": ["Mongolia", "Russian Federation"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Asia", "Europe"]}, "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": 51.0}, "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": 99.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "99.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 97.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 103.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 49.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 52.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[96.75, 51.5], [96.85, 51.75], [96.75, 52.0], [96.97, 52.53], [97.5, 52.75], [98.03, 52.53], [98.25, 52.0], [98.15, 51.75], [98.18, 51.68], [98.25, 51.65], [98.5, 51.75], [98.75, 51.65], [98.82, 51.68], [98.97, 52.03], [99.5, 52.25], [100.0, 52.04], [100.5, 52.25], [100.75, 52.15], [101.0, 52.25], [101.25, 52.15], [101.5, 52.25], [102.03, 52.03], [102.18, 51.68], [102.25, 51.65], [102.5, 51.75], [102.75, 51.65], [103.0, 51.75], [103.25, 51.65], [103.5, 51.75], [104.03, 51.53], [104.25, 51.0], [104.03, 50.47], [103.5, 50.25], [103.25, 50.35], [103.18, 50.32], [103.03, 49.97], [102.5, 49.75], [101.97, 49.97], [101.82, 50.32], [101.75, 50.35], [101.5, 50.25], [101.0, 50.46], [100.68, 50.32], [100.53, 49.97], [100.0, 49.75], [99.75, 49.85], [99.68, 49.82], [99.53, 49.47], [99.0, 49.25], [98.75, 49.35], [98.68, 49.32], [98.53, 48.97], [98.0, 48.75], [97.47, 48.97], [97.25, 49.5], [97.35, 49.75], [97.32, 49.82], [96.97, 49.97], [96.75, 50.5], [96.96, 51.0], [96.75, 51.5]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Siberia"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-09-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[96.97, 49.97], [96.75, 50.5], [96.97, 51.03], [97.5, 51.25], [98.03, 51.03], [98.18, 50.68], [98.25, 50.65], [98.5, 50.75], [99.03, 50.53], [99.25, 50.0], [99.03, 49.47], [98.68, 49.32], [98.53, 48.97], [98.0, 48.75], [97.47, 48.97], [97.25, 49.5], [97.35, 49.75], [97.32, 49.82], [96.97, 49.97]]]]}, "2021-09-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[96.97, 49.97], [96.75, 50.5], [96.97, 51.03], [97.5, 51.25], [98.03, 51.03], [98.18, 50.68], [98.25, 50.65], [98.32, 50.68], [98.35, 50.75], [98.25, 51.0], [98.47, 51.53], [99.0, 51.75], [99.25, 51.65], [99.5, 51.75], [100.03, 51.53], [100.18, 51.18], [100.43, 51.07], [100.25, 51.5], [100.47, 52.03], [101.0, 52.25], [101.53, 52.03], [101.75, 51.5], [101.53, 50.97], [101.0, 50.75], [100.57, 50.93], [100.75, 50.5], [100.53, 49.97], [100.0, 49.75], [99.5, 49.96], [99.18, 49.82], [99.03, 49.47], [98.68, 49.32], [98.53, 48.97], [98.0, 48.75], [97.47, 48.97], [97.25, 49.5], [97.35, 49.75], [97.32, 49.82], [96.97, 49.97]]]]}, "2021-09-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[96.75, 52.0], [96.97, 52.53], [97.5, 52.75], [98.03, 52.53], [98.25, 52.0], [98.15, 51.75], [98.18, 51.68], [98.25, 51.65], [98.5, 51.75], [98.75, 51.65], [99.0, 51.75], [99.25, 51.65], [99.5, 51.75], [99.8, 51.63], [99.97, 52.03], [100.5, 52.25], [100.75, 52.15], [101.0, 52.25], [101.53, 52.03], [101.75, 51.5], [101.53, 50.97], [101.18, 50.82], [101.03, 50.47], [100.68, 50.32], [100.53, 49.97], [100.0, 49.75], [99.75, 49.85], [99.68, 49.82], [99.53, 49.47], [99.0, 49.25], [98.75, 49.35], [98.68, 49.32], [98.53, 48.97], [98.0, 48.75], [97.47, 48.97], [97.25, 49.5], [97.35, 49.75], [97.32, 49.82], [96.97, 49.97], [96.75, 50.5], [96.96, 51.0], [96.75, 51.5], [96.85, 51.75], [96.75, 52.0]]]]}, "2021-09-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[96.75, 52.0], [96.97, 52.53], [97.5, 52.75], [98.03, 52.53], [98.25, 52.0], [98.15, 51.75], [98.18, 51.68], [98.25, 51.65], [98.5, 51.75], [98.75, 51.65], [98.82, 51.68], [98.97, 52.03], [99.5, 52.25], [100.0, 52.04], [100.5, 52.25], [100.75, 52.15], [101.0, 52.25], [101.25, 52.15], [101.5, 52.25], [102.03, 52.03], [102.18, 51.68], [102.25, 51.65], [102.5, 51.75], [102.75, 51.65], [103.0, 51.75], [103.25, 51.65], [103.5, 51.75], [104.03, 51.53], [104.25, 51.0], [104.03, 50.47], [103.5, 50.25], [103.25, 50.35], [103.18, 50.32], [103.03, 49.97], [102.5, 49.75], [101.97, 49.97], [101.82, 50.32], [101.75, 50.35], [101.5, 50.25], [101.0, 50.46], [100.68, 50.32], [100.53, 49.97], [100.0, 49.75], [99.75, 49.85], [99.68, 49.82], [99.53, 49.47], [99.0, 49.25], [98.75, 49.35], [98.68, 49.32], [98.53, 48.97], [98.0, 48.75], [97.47, 48.97], [97.25, 49.5], [97.35, 49.75], [97.32, 49.82], [96.97, 49.97], [96.75, 50.5], [96.96, 51.0], [96.75, 51.5], [96.85, 51.75], [96.75, 52.0]]]]}, "2021-09-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[96.75, 52.0], [96.97, 52.53], [97.5, 52.75], [98.03, 52.53], [98.25, 52.0], [98.15, 51.75], [98.18, 51.68], [98.25, 51.65], [98.5, 51.75], [98.75, 51.65], [98.82, 51.68], [98.97, 52.03], [99.5, 52.25], [100.0, 52.04], [100.5, 52.25], [100.75, 52.15], [101.0, 52.25], [101.25, 52.15], [101.5, 52.25], [102.03, 52.03], [102.18, 51.68], [102.25, 51.65], [102.5, 51.75], [102.75, 51.65], [103.0, 51.75], [103.25, 51.65], [103.5, 51.75], [104.03, 51.53], [104.25, 51.0], [104.03, 50.47], [103.5, 50.25], [103.25, 50.35], [103.18, 50.32], [103.03, 49.97], [102.5, 49.75], [101.97, 49.97], [101.82, 50.32], [101.75, 50.35], [101.5, 50.25], [101.0, 50.46], [100.68, 50.32], [100.53, 49.97], [100.0, 49.75], [99.75, 49.85], [99.68, 49.82], [99.53, 49.47], [99.0, 49.25], [98.75, 49.35], [98.68, 49.32], [98.53, 48.97], [98.0, 48.75], [97.47, 48.97], [97.25, 49.5], [97.35, 49.75], [97.32, 49.82], [96.97, 49.97], [96.75, 50.5], [96.96, 51.0], [96.75, 51.5], [96.85, 51.75], [96.75, 52.0]]]]}, "2021-09-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[98.97, 52.03], [99.5, 52.25], [100.03, 52.03], [100.18, 51.68], [100.3, 51.63], [100.47, 52.03], [101.0, 52.25], [101.25, 52.15], [101.5, 52.25], [102.03, 52.03], [102.18, 51.68], [102.25, 51.65], [102.5, 51.75], [102.75, 51.65], [103.0, 51.75], [103.25, 51.65], [103.5, 51.75], [104.03, 51.53], [104.25, 51.0], [104.03, 50.47], [103.5, 50.25], [103.25, 50.35], [103.18, 50.32], [103.03, 49.97], [102.5, 49.75], [101.97, 49.97], [101.82, 50.32], [101.75, 50.35], [101.5, 50.25], [100.97, 50.47], [100.82, 50.82], [100.7, 50.88], [100.53, 50.47], [100.0, 50.25], [99.75, 50.35], [99.5, 50.25], [99.25, 50.35], [99.0, 50.25], [98.47, 50.47], [98.25, 51.0], [98.47, 51.53], [98.82, 51.68], [98.97, 52.03]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -14.39299606070881}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -7.767457221550655}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-5.683655670766143, -4.926056601280266, -5.773927571264039, -8.76353200751879, -8.73507652210526, -7.983677117672414]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-7.637136470563803, -6.873997875491057, -8.64707167951127, -12.155851919343888, -14.740923324984749, -10.24566019934764]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-7.929998429385719, -6.207405152339492, -6.369128628308632, -8.759955476645425, -8.462397294036633, -7.159980045792153]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-8.433046058479533, -7.9684695260562535, -8.597264841768151, -12.116955930452605, -14.39299606070881, -8.797520461433578]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-2.0844991322030695, -1.6079355874885601, -1.6722044889479915, -2.2151412139309463, -2.1678871312671175, -1.8175685565451023]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.153720234958219, -2.0331548484533153, -2.355291256163991, -3.2564531716460206, -4.015874545507346, -2.5408110684418994]}}