{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-03-19 18:21:53.984070", "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-Jan-26_to_2021-Jan-28_257.5_40.0"}, "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": 2021010001051}, "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": "January 26 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 28 2021"}, "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": 54733.219171630495}, "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": 40.0}, "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": 257.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "257.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 257.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 261.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 38.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 41.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "Polygon", "coordinates": [[[-103.03, 41.03], [-102.5, 41.25], [-102.25, 41.146], [-102.177, 41.177], [-102.03, 41.53], [-101.5, 41.75], [-101.25, 41.646], [-101.0, 41.75], [-100.47, 41.53], [-100.25, 41.0], [-100.354, 40.75], [-100.323, 40.677], [-99.97, 40.53], [-99.823, 40.177], [-99.75, 40.146], [-99.5, 40.25], [-98.97, 40.03], [-98.823, 39.677], [-98.47, 39.53], [-98.25, 39.0], [-98.354, 38.75], [-98.25, 38.5], [-98.47, 37.97], [-99.0, 37.75], [-99.25, 37.854], [-99.5, 37.75], [-99.75, 37.854], [-100.0, 37.75], [-100.53, 37.97], [-100.677, 38.323], [-100.75, 38.354], [-101.0, 38.25], [-101.25, 38.354], [-101.5, 38.25], [-102.03, 38.47], [-102.25, 39.0], [-102.125, 39.302], [-102.25, 39.354], [-102.5, 39.25], [-103.03, 39.47], [-103.25, 40.0], [-103.146, 40.25], [-103.25, 40.5], [-103.03, 41.03]]]}}, "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": {"2021-01-26T11:30:00.000000000": {"type": "Polygon", "coordinates": 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38.25], [-101.25, 38.35355339059328], [-101.5, 38.25], [-102.03033008588989, 38.46966991411009], [-102.25, 39.0], [-102.125, 39.30177669529663], [-102.25, 39.35355339059328], [-102.5, 39.25], [-103.03033008588989, 39.46966991411009], [-103.25, 40.0], [-103.14644660940672, 40.25]]]}, "2021-01-27T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[-103.14644660940672, 40.25], [-103.25, 40.5], [-103.03033008588989, 41.03033008588991], [-102.5, 41.25], [-102.25, 41.14644660940672], [-102.17677669529661, 41.17677669529664], [-102.03033008588989, 41.53033008588991], [-101.5, 41.75], [-101.25, 41.64644660940672], [-101.0, 41.75], [-100.46966991411011, 41.53033008588991], [-100.25, 41.0], [-100.35355339059328, 40.75], [-100.32322330470339, 40.67677669529664], [-99.96966991411011, 40.53033008588991], [-99.82322330470339, 40.17677669529664], [-99.75, 40.14644660940672], [-99.5, 40.25], [-98.96966991411011, 40.03033008588991], [-98.82322330470339, 39.67677669529664], [-98.46966991411011, 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"max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -11.529286721819574}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -8.857247156412988}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-8.492774042789563, -10.325420493602792, -8.76158282260576]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-9.545813969163987, -11.382336721365562, -10.771608226284513]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-8.120808051663598, -9.965726817863894, -8.485206599711475]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-9.825737432882534, -11.529286721819574, -10.209236158456633]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.6754267304362482, -1.9571530218193751, -1.5630503297465363]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.091718979403965, -2.3182723108397463, -1.8207589024491584]}}