{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:53:09.118164", "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-May-09_to_2023-May-12_77.5_68.5"}, "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": 2023050000348}, "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": "May 09 2023"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 12 2023"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 4}, "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": 55583.03161894932}, "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": ["Russian Federation"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["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": 68.5}, "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": 77.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "77.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 73.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 83.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 68.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 71.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[73.5, 69.25], [73.75, 69.15], [73.82, 69.18], [73.97, 69.53], [74.5, 69.75], [74.75, 69.65], [75.0, 69.75], [75.25, 69.65], [75.5, 69.75], [75.75, 69.65], [76.0, 69.75], [76.25, 69.65], [76.5, 69.75], [76.75, 69.65], [76.82, 69.68], [76.97, 70.03], [77.5, 70.25], [77.75, 70.15], [78.0, 70.25], [78.25, 70.15], [78.5, 70.25], [78.75, 70.15], [79.0, 70.25], [79.25, 70.15], [79.32, 70.18], [79.47, 70.53], [80.0, 70.75], [80.25, 70.65], [80.5, 70.75], [80.75, 70.65], [81.0, 70.75], [81.25, 70.65], [81.5, 70.75], [81.75, 70.65], [81.88, 70.7], [81.75, 71.0], [81.97, 71.53], [82.5, 71.75], [82.75, 71.65], [82.82, 71.68], [82.97, 72.03], [83.5, 72.25], [84.03, 72.03], [84.25, 71.5], [84.04, 71.0], [84.25, 70.5], [84.04, 70.0], [84.25, 69.5], [84.03, 68.97], [83.5, 68.75], [83.25, 68.85], [83.18, 68.82], [83.03, 68.47], [82.5, 68.25], [82.25, 68.35], [82.0, 68.25], [81.75, 68.35], [81.5, 68.25], [81.25, 68.35], [81.0, 68.25], [80.75, 68.35], [80.5, 68.25], [80.25, 68.35], [80.0, 68.25], [79.75, 68.35], [79.5, 68.25], [79.25, 68.35], [79.18, 68.32], [79.03, 67.97], [78.5, 67.75], [78.25, 67.85], [78.0, 67.75], [77.75, 67.85], [77.5, 67.75], [77.25, 67.85], [77.0, 67.75], [76.75, 67.85], [76.5, 67.75], [75.97, 67.97], [75.82, 68.32], [75.75, 68.35], [75.5, 68.25], [75.25, 68.35], [75.18, 68.32], [75.03, 67.97], [74.68, 67.82], [74.53, 67.47], [74.0, 67.25], [73.47, 67.47], [73.32, 67.82], [72.97, 67.97], [72.75, 68.5], [72.97, 69.03], [73.5, 69.25]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Russian-Arctic"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2023-05-09T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[76.0, 68.25], [75.47, 68.47], [75.25, 69.0], [75.47, 69.53], [76.0, 69.75], [76.25, 69.65], [76.5, 69.75], [76.75, 69.65], [76.82, 69.68], [76.97, 70.03], [77.5, 70.25], [77.75, 70.15], [78.0, 70.25], [78.25, 70.15], [78.5, 70.25], [78.75, 70.15], [79.0, 70.25], [79.25, 70.15], [79.32, 70.18], [79.47, 70.53], [80.0, 70.75], [80.25, 70.65], [80.5, 70.75], [80.75, 70.65], [81.0, 70.75], [81.25, 70.65], [81.5, 70.75], [81.75, 70.65], [81.88, 70.7], [81.75, 71.0], [81.97, 71.53], [82.5, 71.75], [82.75, 71.65], [82.82, 71.68], [82.97, 72.03], [83.5, 72.25], [84.03, 72.03], [84.25, 71.5], [84.04, 71.0], [84.25, 70.5], [84.04, 70.0], [84.25, 69.5], [84.03, 68.97], [83.5, 68.75], [83.25, 68.85], [83.18, 68.82], [83.03, 68.47], [82.5, 68.25], [82.25, 68.35], [82.0, 68.25], [81.75, 68.35], [81.5, 68.25], [81.25, 68.35], [81.0, 68.25], [80.75, 68.35], [80.5, 68.25], [80.25, 68.35], [80.0, 68.25], [79.75, 68.35], [79.5, 68.25], [79.25, 68.35], [79.18, 68.32], [79.03, 67.97], [78.5, 67.75], [78.25, 67.85], [78.0, 67.75], [77.75, 67.85], [77.5, 67.75], [77.25, 67.85], [77.0, 67.75], [76.47, 67.97], [76.32, 68.32], [76.25, 68.35], [76.0, 68.25]]]]}, "2023-05-10T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[72.97, 67.97], [72.75, 68.5], [72.97, 69.03], [73.5, 69.25], [73.75, 69.15], [73.82, 69.18], [73.97, 69.53], [74.5, 69.75], [74.75, 69.65], [75.0, 69.75], [75.25, 69.65], [75.5, 69.75], [75.75, 69.65], [76.0, 69.75], [76.25, 69.65], [76.5, 69.75], [76.75, 69.65], [76.82, 69.68], [76.97, 70.03], [77.5, 70.25], [77.75, 70.15], [78.0, 70.25], [78.25, 70.15], [78.5, 70.25], [78.75, 70.15], [79.0, 70.25], [79.25, 70.15], [79.32, 70.18], [79.47, 70.53], [80.0, 70.75], [80.25, 70.65], [80.5, 70.75], [80.75, 70.65], [81.0, 70.75], [81.25, 70.65], [81.5, 70.75], [81.75, 70.65], [81.88, 70.7], [81.75, 71.0], [81.97, 71.53], [82.5, 71.75], [82.75, 71.65], [82.82, 71.68], [82.97, 72.03], [83.5, 72.25], [84.03, 72.03], [84.25, 71.5], [84.04, 71.0], [84.25, 70.5], [84.04, 70.0], [84.25, 69.5], [84.03, 68.97], [83.5, 68.75], [83.25, 68.85], [83.18, 68.82], [83.03, 68.47], [82.5, 68.25], [82.25, 68.35], [82.0, 68.25], [81.75, 68.35], [81.5, 68.25], [81.25, 68.35], [81.0, 68.25], [80.75, 68.35], [80.5, 68.25], [80.25, 68.35], [80.0, 68.25], [79.75, 68.35], [79.5, 68.25], [79.25, 68.35], [79.18, 68.32], [79.03, 67.97], [78.5, 67.75], [78.25, 67.85], [78.0, 67.75], [77.75, 67.85], [77.5, 67.75], [77.25, 67.85], [77.0, 67.75], [76.75, 67.85], [76.5, 67.75], [75.97, 67.97], [75.82, 68.32], [75.75, 68.35], [75.5, 68.25], [75.25, 68.35], [75.18, 68.32], [75.03, 67.97], [74.68, 67.82], [74.53, 67.47], [74.0, 67.25], [73.47, 67.47], [73.32, 67.82], [72.97, 67.97]]]]}, "2023-05-11T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[72.97, 67.97], [72.75, 68.5], [72.97, 69.03], [73.5, 69.25], [73.75, 69.15], [73.82, 69.18], [73.97, 69.53], [74.5, 69.75], [74.75, 69.65], [75.0, 69.75], [75.25, 69.65], [75.5, 69.75], [75.75, 69.65], [76.0, 69.75], [76.25, 69.65], [76.5, 69.75], [76.75, 69.65], [76.82, 69.68], [76.97, 70.03], [77.5, 70.25], [77.75, 70.15], [78.0, 70.25], [78.25, 70.15], [78.5, 70.25], [78.75, 70.15], [79.0, 70.25], [79.25, 70.15], [79.32, 70.18], [79.47, 70.53], [80.0, 70.75], [80.25, 70.65], [80.5, 70.75], [80.75, 70.65], [81.0, 70.75], [81.25, 70.65], [81.5, 70.75], [81.75, 70.65], [81.88, 70.7], [81.75, 71.0], [81.97, 71.53], [82.5, 71.75], [82.75, 71.65], [82.82, 71.68], [82.97, 72.03], [83.5, 72.25], [84.03, 72.03], [84.25, 71.5], [84.04, 71.0], [84.25, 70.5], [84.04, 70.0], [84.25, 69.5], [84.03, 68.97], [83.5, 68.75], [83.25, 68.85], [83.18, 68.82], [83.03, 68.47], [82.5, 68.25], [82.25, 68.35], [82.0, 68.25], [81.75, 68.35], [81.5, 68.25], [81.25, 68.35], [81.0, 68.25], [80.75, 68.35], [80.5, 68.25], [80.25, 68.35], [80.0, 68.25], [79.75, 68.35], [79.5, 68.25], [79.25, 68.35], [79.18, 68.32], [79.03, 67.97], [78.5, 67.75], [78.25, 67.85], [78.0, 67.75], [77.75, 67.85], [77.5, 67.75], [77.25, 67.85], [77.0, 67.75], [76.75, 67.85], [76.5, 67.75], [75.97, 67.97], [75.82, 68.32], [75.75, 68.35], [75.5, 68.25], [75.25, 68.35], [75.18, 68.32], [75.03, 67.97], [74.68, 67.82], [74.53, 67.47], [74.0, 67.25], [73.47, 67.47], [73.32, 67.82], [72.97, 67.97]]]]}, "2023-05-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[72.97, 67.97], [72.75, 68.5], [72.97, 69.03], [73.5, 69.25], [73.75, 69.15], [73.82, 69.18], [73.97, 69.53], [74.5, 69.75], [74.75, 69.65], [75.0, 69.75], [75.25, 69.65], [75.5, 69.75], [75.75, 69.65], [76.0, 69.75], [76.25, 69.65], [76.5, 69.75], [76.75, 69.65], [76.82, 69.68], [76.97, 70.03], [77.5, 70.25], [77.75, 70.15], [78.0, 70.25], [78.25, 70.15], [78.5, 70.25], [78.75, 70.15], [79.0, 70.25], [79.25, 70.15], [79.5, 70.25], [79.75, 70.15], [80.0, 70.25], [80.25, 70.15], [80.5, 70.25], [80.75, 70.15], [81.0, 70.25], [81.53, 70.03], [81.68, 69.68], [82.03, 69.53], [82.25, 69.0], [82.03, 68.47], [81.5, 68.25], [81.25, 68.35], [81.0, 68.25], [80.75, 68.35], [80.5, 68.25], [80.25, 68.35], [80.0, 68.25], [79.75, 68.35], [79.5, 68.25], [79.25, 68.35], [79.18, 68.32], [79.03, 67.97], [78.5, 67.75], [78.25, 67.85], [78.0, 67.75], [77.75, 67.85], [77.5, 67.75], [77.25, 67.85], [77.0, 67.75], [76.75, 67.85], [76.5, 67.75], [75.97, 67.97], [75.82, 68.32], [75.75, 68.35], [75.5, 68.25], [75.25, 68.35], [75.18, 68.32], [75.03, 67.97], [74.68, 67.82], [74.53, 67.47], [74.0, 67.25], [73.47, 67.47], [73.32, 67.82], [72.97, 67.97]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -9.0526761105927}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.9834200398979585}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-11.898214903989015, -11.465436051413462, -11.847551346228443, -12.192318973020576]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-12.617000473064593, -12.726153974859187, -13.104920566646058, -14.16698019854789]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.665084466117324, -5.564922485988133, -6.097891222465026, -6.895725496493204]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.298807624033657, -6.422855822769407, -7.295586048053394, -9.0526761105927]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3689944987573879, -1.3729728944139612, -1.4808098231702453, -1.680013494589242]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.4813053013767126, -1.7449668847286093, -1.773763914880425, -2.2132952786745776]}}