{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 08:50:09.589629", "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-Apr-12_to_2012-Apr-15_241.5_36.0"}, "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": 2012040000759}, "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 12 2012"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 15 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": 54491.42471196845}, "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": 36.0}, "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": 241.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "241.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 238.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 243.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 34.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 39.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2012-04-12T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-121.75, 39.0], [-121.53, 39.53], [-121.0, 39.75], [-120.75, 39.65], [-120.5, 39.75], [-119.97, 39.53], [-119.75, 39.0], [-119.85, 38.75], [-119.82, 38.68], [-119.47, 38.53], [-119.32, 38.18], [-119.25, 38.15], [-119.0, 38.25], [-118.47, 38.03], [-118.25, 37.5], [-118.35, 37.25], [-118.32, 37.18], [-117.97, 37.03], [-117.8, 36.63], [-117.5, 36.75], [-117.25, 36.65], [-117.0, 36.75], [-116.47, 36.53], [-116.25, 36.0], [-116.47, 35.47], [-117.0, 35.25], [-117.25, 35.35], [-117.5, 35.25], [-118.0, 35.46], [-118.5, 35.25], [-119.03, 35.47], [-119.25, 36.0], [-119.15, 36.25], [-119.18, 36.32], [-119.25, 36.35], [-119.5, 36.25], [-120.0, 36.46], [-120.5, 36.25], [-121.03, 36.47], [-121.25, 37.0], [-121.04, 37.5], [-121.25, 38.0], [-121.15, 38.25], [-121.18, 38.32], [-121.53, 38.47], [-121.75, 39.0]]]]}, "2012-04-13T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-121.75, 39.0], [-121.53, 39.53], [-121.0, 39.75], [-120.75, 39.65], [-120.5, 39.75], [-119.97, 39.53], [-119.75, 39.0], [-119.85, 38.75], [-119.82, 38.68], [-119.47, 38.53], [-119.32, 38.18], [-119.25, 38.15], [-119.0, 38.25], [-118.47, 38.03], [-118.25, 37.5], [-118.35, 37.25], [-118.32, 37.18], [-117.97, 37.03], [-117.82, 36.68], [-117.75, 36.65], [-117.5, 36.75], [-117.25, 36.65], [-117.0, 36.75], [-116.47, 36.53], [-116.25, 36.0], [-116.35, 35.75], [-116.25, 35.5], [-116.35, 35.25], [-116.25, 35.0], [-116.47, 34.47], [-117.0, 34.25], [-117.25, 34.35], [-117.5, 34.25], [-117.75, 34.35], [-118.0, 34.25], [-118.53, 34.47], [-118.75, 35.0], [-118.65, 35.25], [-118.68, 35.32], [-119.03, 35.47], [-119.25, 36.0], [-119.15, 36.25], [-119.18, 36.32], [-119.25, 36.35], [-119.5, 36.25], [-120.0, 36.46], [-120.5, 36.25], [-121.03, 36.47], [-121.25, 37.0], [-121.04, 37.5], [-121.25, 38.0], [-121.15, 38.25], [-121.18, 38.32], [-121.53, 38.47], [-121.75, 39.0]]]]}, "2012-04-14T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-121.75, 39.0], [-121.53, 39.53], [-121.0, 39.75], [-120.75, 39.65], [-120.5, 39.75], [-119.97, 39.53], [-119.75, 39.0], [-119.85, 38.75], [-119.82, 38.68], [-119.47, 38.53], [-119.32, 38.18], [-119.25, 38.15], [-119.0, 38.25], [-118.47, 38.03], [-118.25, 37.5], [-118.35, 37.25], [-118.32, 37.18], [-117.97, 37.03], [-117.82, 36.68], [-117.75, 36.65], [-117.5, 36.75], [-117.25, 36.65], [-117.0, 36.75], [-116.47, 36.53], [-116.25, 36.0], [-116.35, 35.75], [-116.25, 35.5], [-116.35, 35.25], [-116.25, 35.0], [-116.47, 34.47], [-117.0, 34.25], [-117.25, 34.35], [-117.5, 34.25], [-117.75, 34.35], [-118.0, 34.25], [-118.53, 34.47], [-118.75, 35.0], [-118.65, 35.25], [-118.68, 35.32], [-119.03, 35.47], [-119.25, 36.0], [-119.15, 36.25], [-119.18, 36.32], [-119.25, 36.35], [-119.5, 36.25], [-120.0, 36.46], [-120.5, 36.25], [-121.03, 36.47], [-121.25, 37.0], [-121.04, 37.5], [-121.25, 38.0], [-121.15, 38.25], [-121.18, 38.32], [-121.53, 38.47], [-121.75, 39.0]]]]}, "2012-04-15T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-119.25, 36.0], [-119.03, 36.53], [-118.5, 36.75], [-118.25, 36.65], [-118.0, 36.75], [-117.47, 36.53], [-117.32, 36.18], [-117.25, 36.15], [-117.0, 36.25], [-116.47, 36.03], [-116.25, 35.5], [-116.35, 35.25], [-116.25, 35.0], [-116.47, 34.47], [-117.0, 34.25], [-117.25, 34.35], [-117.5, 34.25], [-117.75, 34.35], [-118.0, 34.25], [-118.53, 34.47], [-118.75, 35.0], [-118.65, 35.25], [-118.68, 35.32], [-119.03, 35.47], [-119.25, 36.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -10.743207944387734}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -6.066748108005991}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [3.733132723854794, 5.0953373769944506, 3.4297590143441425, 7.739618100472171]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-5.9548569074148645, -6.22636072291732, -7.052222663383759, 0.30902668887148366]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.971673831566863, -5.528261666887937, -7.34644336538712, -6.081688131605894]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.324010119993034, -6.6500414431601484, -10.743207944387734, -6.425422518127334]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4676224917587009, -1.5827573798604797, -2.0454740179175386, -1.5827461391945923]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.6961497884147914, -1.7710416538600915, -2.6049630289720582, -1.7211895561850474]}}