{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 08:52:01.529813", "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": "2012-Dec-20_to_2012-Dec-23_251.0_37.0"}, "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": 2012120000824}, "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 20 2012"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 23 2012"}, "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": 151034.92023691183}, "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"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.North-America"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["North 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": 37.0}, "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": 251.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "251.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 246.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 252.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 35.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 41.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2012-12-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-114.25, 36.5], [-114.03, 37.03], [-113.68, 37.18], [-113.53, 37.53], [-113.0, 37.75], [-112.75, 37.65], [-112.68, 37.68], [-112.53, 38.03], [-112.0, 38.25], [-111.75, 38.15], [-111.68, 38.18], [-111.65, 38.25], [-111.75, 38.5], [-111.53, 39.03], [-111.18, 39.18], [-111.15, 39.25], [-111.25, 39.5], [-111.15, 39.75], [-111.25, 40.0], [-111.03, 40.53], [-110.5, 40.75], [-110.25, 40.65], [-110.18, 40.68], [-110.03, 41.03], [-109.5, 41.25], [-109.2, 41.13], [-109.03, 41.53], [-108.5, 41.75], [-108.25, 41.65], [-108.0, 41.75], [-107.47, 41.53], [-107.25, 41.0], [-107.35, 40.75], [-107.25, 40.5], [-107.37, 40.2], [-106.97, 40.03], [-106.75, 39.5], [-106.97, 38.97], [-107.5, 38.75], [-107.75, 38.85], [-107.82, 38.82], [-107.97, 38.47], [-108.5, 38.25], [-108.75, 38.35], [-108.82, 38.32], [-108.85, 38.25], [-108.82, 38.18], [-108.47, 38.03], [-108.32, 37.68], [-107.97, 37.53], [-107.82, 37.18], [-107.75, 37.15], [-107.5, 37.25], [-106.97, 37.03], [-106.75, 36.5], [-106.97, 35.97], [-107.5, 35.75], [-107.75, 35.85], [-107.82, 35.82], [-107.97, 35.47], [-108.5, 35.25], [-109.03, 35.47], [-109.25, 36.0], [-109.15, 36.25], [-109.18, 36.32], [-109.25, 36.35], [-109.5, 36.25], [-109.75, 36.35], [-109.87, 36.3], [-109.75, 36.0], [-109.97, 35.47], [-110.5, 35.25], [-111.0, 35.46], [-111.5, 35.25], [-111.75, 35.35], [-112.0, 35.25], [-112.25, 35.35], [-112.32, 35.32], [-112.47, 34.97], [-113.0, 34.75], [-113.53, 34.97], [-113.75, 35.5], [-113.65, 35.75], [-113.68, 35.82], [-114.03, 35.97], [-114.25, 36.5]]]]}, "2012-12-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-114.25, 36.5], [-114.03, 37.03], [-113.68, 37.18], [-113.53, 37.53], [-113.0, 37.75], [-112.75, 37.65], [-112.68, 37.68], [-112.53, 38.03], [-112.0, 38.25], [-111.75, 38.15], [-111.68, 38.18], [-111.65, 38.25], [-111.75, 38.5], [-111.53, 39.03], [-111.18, 39.18], [-111.15, 39.25], [-111.25, 39.5], [-111.15, 39.75], [-111.25, 40.0], [-111.03, 40.53], [-110.5, 40.75], [-110.25, 40.65], [-110.18, 40.68], [-110.03, 41.03], [-109.5, 41.25], [-109.2, 41.13], [-109.03, 41.53], [-108.5, 41.75], [-108.25, 41.65], [-108.0, 41.75], [-107.47, 41.53], [-107.25, 41.0], [-107.35, 40.75], [-107.25, 40.5], [-107.37, 40.2], [-106.97, 40.03], [-106.75, 39.5], [-106.97, 38.97], [-107.5, 38.75], [-107.75, 38.85], [-107.82, 38.82], [-107.97, 38.47], [-108.5, 38.25], [-108.75, 38.35], [-108.82, 38.32], [-108.85, 38.25], [-108.82, 38.18], [-108.47, 38.03], [-108.32, 37.68], [-107.97, 37.53], [-107.82, 37.18], [-107.75, 37.15], [-107.5, 37.25], [-106.97, 37.03], [-106.75, 36.5], [-106.97, 35.97], [-107.5, 35.75], [-107.75, 35.85], [-107.82, 35.82], [-107.97, 35.47], [-108.5, 35.25], [-109.03, 35.47], [-109.25, 36.0], [-109.15, 36.25], [-109.18, 36.32], [-109.25, 36.35], [-109.5, 36.25], [-109.75, 36.35], [-109.87, 36.3], [-109.75, 36.0], [-109.97, 35.47], [-110.5, 35.25], [-111.0, 35.46], [-111.5, 35.25], [-111.75, 35.35], [-112.0, 35.25], [-112.25, 35.35], [-112.32, 35.32], [-112.47, 34.97], [-113.0, 34.75], [-113.53, 34.97], [-113.75, 35.5], [-113.65, 35.75], [-113.68, 35.82], [-114.03, 35.97], [-114.25, 36.5]]]]}, "2012-12-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-114.25, 36.5], [-114.03, 37.03], [-113.68, 37.18], [-113.53, 37.53], [-113.0, 37.75], [-112.75, 37.65], [-112.68, 37.68], [-112.53, 38.03], [-112.0, 38.25], [-111.75, 38.15], [-111.68, 38.18], [-111.65, 38.25], [-111.75, 38.5], [-111.53, 39.03], [-111.18, 39.18], [-111.15, 39.25], [-111.25, 39.5], [-111.15, 39.75], [-111.25, 40.0], [-111.03, 40.53], [-110.5, 40.75], [-110.25, 40.65], [-110.18, 40.68], [-110.03, 41.03], [-109.5, 41.25], [-109.2, 41.13], [-109.03, 41.53], [-108.5, 41.75], [-108.25, 41.65], [-108.0, 41.75], [-107.47, 41.53], [-107.25, 41.0], [-107.35, 40.75], [-107.25, 40.5], [-107.37, 40.2], [-106.97, 40.03], [-106.75, 39.5], [-106.97, 38.97], [-107.5, 38.75], [-107.75, 38.85], [-107.82, 38.82], [-107.97, 38.47], [-108.5, 38.25], [-108.75, 38.35], [-108.82, 38.32], [-108.85, 38.25], [-108.82, 38.18], [-108.47, 38.03], [-108.32, 37.68], [-107.97, 37.53], [-107.82, 37.18], [-107.75, 37.15], [-107.5, 37.25], [-106.97, 37.03], [-106.75, 36.5], [-106.97, 35.97], [-107.5, 35.75], [-107.75, 35.85], [-107.82, 35.82], [-107.97, 35.47], [-108.5, 35.25], [-109.03, 35.47], [-109.25, 36.0], [-109.15, 36.25], [-109.18, 36.32], [-109.25, 36.35], [-109.5, 36.25], [-109.75, 36.35], [-109.87, 36.3], [-109.75, 36.0], [-109.97, 35.47], [-110.5, 35.25], [-111.0, 35.46], [-111.5, 35.25], [-111.75, 35.35], [-112.0, 35.25], [-112.25, 35.35], [-112.32, 35.32], [-112.47, 34.97], [-113.0, 34.75], [-113.53, 34.97], [-113.75, 35.5], [-113.65, 35.75], [-113.68, 35.82], [-114.03, 35.97], [-114.25, 36.5]]]]}, "2012-12-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-110.25, 37.0], [-110.03, 37.53], [-109.5, 37.75], [-109.25, 37.65], [-109.0, 37.75], [-108.47, 37.53], [-108.32, 37.18], [-107.97, 37.03], [-107.75, 36.5], [-107.97, 35.97], [-108.5, 35.75], [-109.03, 35.97], [-109.18, 36.32], [-109.25, 36.35], [-109.5, 36.25], [-110.03, 36.47], [-110.25, 37.0]]], [[[-111.18, 39.18], [-111.03, 39.53], [-110.62, 39.7], [-110.75, 40.0], [-110.53, 40.53], [-110.0, 40.75], [-109.75, 40.65], [-109.5, 40.75], [-108.97, 40.53], [-108.75, 40.0], [-108.96, 39.5], [-108.75, 39.0], [-108.97, 38.47], [-109.5, 38.25], [-109.8, 38.38], [-109.97, 37.97], [-110.5, 37.75], [-110.75, 37.85], [-110.87, 37.8], [-110.75, 37.5], [-110.97, 36.97], [-111.5, 36.75], [-112.03, 36.97], [-112.25, 37.5], [-112.03, 38.03], [-111.62, 38.2], [-111.75, 38.5], [-111.53, 39.03], [-111.18, 39.18]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -14.686539219363198}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -9.21898810923765}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-13.580028688092, -12.191807187042286, -10.47576946157227, -9.080408999858037]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-21.958264115520507, -19.873649744564347, -18.95840889313783, -12.202098413125611]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-10.995035307142858, -9.501692749968774, -7.580885666760849, -6.610961853048536]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-14.686539219363198, -14.26305474151485, -12.284501138186044, -7.998659198460928]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-2.7787779324453585, -2.2909089848826625, -1.7719249854749806, -1.492631656089965]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-3.8015194692297616, -3.514173957846868, -2.367720894443408, -1.729707917659958]}}