{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-05-20 10:52:28.749062", "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_106.5_35.0"}, "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": 2026040000571}, "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": 55312.917690000046}, "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": ["China"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["E.Asia"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Asia"]}, "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": 35.0}, "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": 106.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "106.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 105.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 108.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 34.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 36.75}, "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": [[[[104.85, 35.25], [104.75, 35.5], [104.85, 35.75], [104.75, 36.0], [104.97, 36.53], [105.32, 36.68], [105.47, 37.03], [106.0, 37.25], [106.25, 37.15], [106.5, 37.25], [106.75, 37.15], [107.0, 37.25], [107.53, 37.03], [107.68, 36.68], [107.75, 36.65], [108.0, 36.75], [108.53, 36.53], [108.75, 36.0], [108.65, 35.75], [108.75, 35.5], [108.53, 34.97], [108.18, 34.82], [108.03, 34.47], [107.5, 34.25], [107.25, 34.35], [107.0, 34.25], [106.75, 34.35], [106.68, 34.32], [106.53, 33.97], [106.0, 33.75], [105.75, 33.85], [105.5, 33.75], [104.97, 33.97], [104.75, 34.5], [104.85, 34.75], [104.75, 35.0], [104.85, 35.25]]]]}, "2026-04-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[104.85, 35.25], [104.75, 35.5], [104.85, 35.75], [104.75, 36.0], [104.97, 36.53], [105.32, 36.68], [105.47, 37.03], [106.0, 37.25], [106.25, 37.15], [106.5, 37.25], [106.75, 37.15], [107.0, 37.25], [107.53, 37.03], [107.68, 36.68], [107.75, 36.65], [108.0, 36.75], [108.53, 36.53], [108.75, 36.0], [108.65, 35.75], [108.75, 35.5], [108.53, 34.97], [108.18, 34.82], [108.03, 34.47], [107.5, 34.25], [107.25, 34.35], [107.0, 34.25], [106.75, 34.35], [106.68, 34.32], [106.53, 33.97], [106.0, 33.75], [105.75, 33.85], [105.5, 33.75], [104.97, 33.97], [104.75, 34.5], [104.85, 34.75], [104.75, 35.0], [104.85, 35.25]]]]}, "2026-04-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[104.85, 35.25], [104.75, 35.5], [104.85, 35.75], [104.75, 36.0], [104.97, 36.53], [105.32, 36.68], [105.47, 37.03], [106.0, 37.25], [106.25, 37.15], [106.5, 37.25], [106.75, 37.15], [107.0, 37.25], [107.53, 37.03], [107.68, 36.68], [107.75, 36.65], [108.0, 36.75], [108.53, 36.53], [108.75, 36.0], [108.65, 35.75], [108.75, 35.5], [108.53, 34.97], [108.18, 34.82], [108.03, 34.47], [107.5, 34.25], [107.25, 34.35], [107.0, 34.25], [106.75, 34.35], [106.68, 34.32], [106.53, 33.97], [106.0, 33.75], [105.75, 33.85], [105.5, 33.75], [104.97, 33.97], [104.75, 34.5], [104.85, 34.75], [104.75, 35.0], [104.85, 35.25]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -9.195090260782024}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -6.194952936387284}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [6.4889622543797145, 6.199700812137451, 4.576941079804385]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [3.2819864908854584, 3.829579925537132, 1.974879201253259]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.501918699502638, -5.763551593761907, -7.319388515897308]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.5212980265726515, -6.873790691728402, -9.195090260782024]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.62737274807776, -1.6689908925673926, -2.088356623269674]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.0629952058810703, -2.302511831485631, -2.4049801792882644]}}