{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 08:48:23.411698", "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": "2011-Sep-19_to_2011-Sep-24_311.0_67.5"}, "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": 2011090000876}, "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": "September 19 2011"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "September 24 2011"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 6}, "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": 213529.05820789386}, "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": ["Greenland"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Greenland/Iceland"]}, "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": ["Davis Strait"]}, "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": 67.5}, "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": 311.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "311.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 306.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 317.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 62.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 71.75}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2011-09-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-48.5, 65.25], [-47.97, 65.03], [-47.75, 64.5], [-47.85, 64.25], [-47.75, 64.0], [-47.97, 63.47], [-48.5, 63.25], [-49.03, 63.47], [-49.25, 64.0], [-49.15, 64.25], [-49.25, 64.5], [-49.03, 65.03], [-48.5, 65.25]]], [[[-50.03, 68.53], [-49.5, 68.75], [-49.25, 68.65], [-49.0, 68.75], [-48.47, 68.53], [-48.25, 68.0], [-48.35, 67.75], [-48.25, 67.5], [-48.47, 66.97], [-49.0, 66.75], [-49.25, 66.85], [-49.5, 66.75], [-49.75, 66.85], [-50.0, 66.75], [-50.3, 66.88], [-50.47, 66.47], [-51.0, 66.25], [-51.53, 66.47], [-51.75, 67.0], [-51.53, 67.53], [-51.0, 67.75], [-50.7, 67.63], [-50.53, 68.03], [-50.18, 68.18], [-50.03, 68.53]]]]}, "2011-09-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-53.0, 69.25], [-52.75, 69.15], [-52.5, 69.25], [-52.25, 69.15], [-52.0, 69.25], [-51.75, 69.15], [-51.68, 69.18], [-51.53, 69.53], [-51.0, 69.75], [-50.75, 69.65], [-50.5, 69.75], [-50.25, 69.65], [-50.18, 69.68], [-50.15, 69.75], [-50.18, 69.82], [-50.53, 69.97], [-50.68, 70.32], [-51.03, 70.47], [-51.25, 71.0], [-51.03, 71.53], [-50.68, 71.68], [-50.53, 72.03], [-50.0, 72.25], [-49.75, 72.15], [-49.5, 72.25], [-48.97, 72.03], [-48.82, 71.68], [-48.47, 71.53], [-48.32, 71.18], [-48.25, 71.15], [-48.0, 71.25], [-47.47, 71.03], [-47.25, 70.5], [-47.35, 70.25], [-47.32, 70.18], [-46.97, 70.03], [-46.82, 69.68], [-46.47, 69.53], [-46.32, 69.18], [-46.25, 69.15], [-46.0, 69.25], [-45.47, 69.03], [-45.25, 68.5], [-45.35, 68.25], [-45.32, 68.18], [-44.97, 68.03], [-44.75, 67.5], [-44.85, 67.25], [-44.82, 67.18], [-44.47, 67.03], [-44.25, 66.5], [-44.35, 66.25], [-44.32, 66.18], [-43.97, 66.03], [-43.82, 65.68], [-43.47, 65.53], [-43.25, 65.0], [-43.47, 64.47], [-43.82, 64.32], [-43.85, 64.25], [-43.82, 64.18], [-43.47, 64.03], [-43.25, 63.5], [-43.47, 62.97], [-44.0, 62.75], [-44.25, 62.85], [-44.5, 62.75], [-45.03, 62.97], [-45.18, 63.32], [-45.25, 63.35], [-45.5, 63.25], [-45.75, 63.35], [-45.82, 63.32], [-45.97, 62.97], [-46.5, 62.75], [-46.75, 62.85], [-47.0, 62.75], [-47.25, 62.85], [-47.5, 62.75], [-47.75, 62.85], [-48.0, 62.75], [-48.25, 62.85], [-48.5, 62.75], [-48.75, 62.85], [-49.0, 62.75], [-49.25, 62.85], [-49.5, 62.75], [-50.03, 62.97], [-50.18, 63.32], [-50.53, 63.47], [-50.75, 64.0], [-50.65, 64.25], [-50.75, 64.5], [-50.62, 64.8], [-51.03, 64.97], [-51.18, 65.32], [-51.25, 65.35], [-51.5, 65.25], [-52.03, 65.47], [-52.25, 66.0], [-52.12, 66.3], [-52.53, 66.47], [-52.75, 67.0], [-52.62, 67.3], [-52.75, 67.35], [-53.0, 67.25], [-53.25, 67.35], [-53.5, 67.25], [-54.03, 67.47], [-54.25, 68.0], [-54.03, 68.53], [-53.68, 68.68], [-53.53, 69.03], [-53.0, 69.25]]]]}, "2011-09-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-53.0, 69.25], [-52.75, 69.15], [-52.5, 69.25], [-52.25, 69.15], [-52.0, 69.25], [-51.75, 69.15], [-51.68, 69.18], [-51.53, 69.53], [-51.0, 69.75], [-50.75, 69.65], [-50.5, 69.75], [-50.25, 69.65], [-50.18, 69.68], [-50.15, 69.75], [-50.18, 69.82], [-50.53, 69.97], [-50.68, 70.32], [-51.03, 70.47], [-51.25, 71.0], [-51.03, 71.53], [-50.68, 71.68], [-50.53, 72.03], [-50.0, 72.25], [-49.75, 72.15], [-49.5, 72.25], [-48.97, 72.03], [-48.82, 71.68], [-48.47, 71.53], [-48.32, 71.18], [-48.25, 71.15], [-48.0, 71.25], [-47.47, 71.03], [-47.25, 70.5], [-47.35, 70.25], [-47.32, 70.18], [-46.97, 70.03], [-46.82, 69.68], [-46.47, 69.53], [-46.32, 69.18], [-46.25, 69.15], [-46.0, 69.25], [-45.47, 69.03], [-45.25, 68.5], [-45.35, 68.25], [-45.32, 68.18], [-44.97, 68.03], [-44.75, 67.5], [-44.85, 67.25], [-44.82, 67.18], [-44.47, 67.03], [-44.25, 66.5], [-44.35, 66.25], [-44.32, 66.18], [-43.97, 66.03], [-43.82, 65.68], [-43.47, 65.53], [-43.25, 65.0], [-43.47, 64.47], [-43.82, 64.32], [-43.85, 64.25], [-43.82, 64.18], [-43.47, 64.03], [-43.25, 63.5], [-43.47, 62.97], [-44.0, 62.75], [-44.25, 62.85], [-44.5, 62.75], [-45.03, 62.97], [-45.18, 63.32], [-45.25, 63.35], [-45.5, 63.25], [-45.75, 63.35], [-45.82, 63.32], [-45.97, 62.97], [-46.5, 62.75], [-46.75, 62.85], [-47.0, 62.75], [-47.25, 62.85], [-47.5, 62.75], [-47.75, 62.85], [-48.0, 62.75], [-48.25, 62.85], [-48.5, 62.75], [-48.75, 62.85], [-49.0, 62.75], [-49.25, 62.85], [-49.5, 62.75], [-50.03, 62.97], [-50.18, 63.32], [-50.53, 63.47], [-50.75, 64.0], [-50.65, 64.25], [-50.75, 64.5], [-50.62, 64.8], [-51.03, 64.97], [-51.18, 65.32], [-51.25, 65.35], [-51.5, 65.25], [-51.75, 65.35], [-52.0, 65.25], [-52.53, 65.47], [-52.75, 66.0], [-52.54, 66.5], [-52.75, 67.0], [-52.62, 67.3], [-52.75, 67.35], [-53.0, 67.25], [-53.25, 67.35], [-53.5, 67.25], [-54.03, 67.47], [-54.25, 68.0], [-54.03, 68.53], [-53.68, 68.68], [-53.53, 69.03], [-53.0, 69.25]]]]}, "2011-09-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-53.0, 69.25], [-52.75, 69.15], [-52.5, 69.25], [-52.25, 69.15], [-52.0, 69.25], [-51.75, 69.15], [-51.68, 69.18], [-51.53, 69.53], [-51.0, 69.75], [-50.75, 69.65], [-50.5, 69.75], [-50.25, 69.65], [-50.18, 69.68], [-50.15, 69.75], [-50.18, 69.82], [-50.53, 69.97], [-50.68, 70.32], [-51.03, 70.47], [-51.25, 71.0], [-51.03, 71.53], [-50.68, 71.68], [-50.53, 72.03], [-50.0, 72.25], [-49.75, 72.15], [-49.5, 72.25], [-48.97, 72.03], [-48.82, 71.68], [-48.47, 71.53], [-48.32, 71.18], [-48.25, 71.15], [-48.0, 71.25], [-47.47, 71.03], [-47.25, 70.5], [-47.35, 70.25], [-47.32, 70.18], [-46.97, 70.03], [-46.82, 69.68], [-46.47, 69.53], [-46.32, 69.18], [-46.25, 69.15], [-46.0, 69.25], [-45.47, 69.03], [-45.25, 68.5], [-45.35, 68.25], [-45.32, 68.18], [-44.97, 68.03], [-44.75, 67.5], [-44.85, 67.25], [-44.82, 67.18], [-44.47, 67.03], [-44.25, 66.5], [-44.35, 66.25], [-44.32, 66.18], [-43.97, 66.03], [-43.82, 65.68], [-43.47, 65.53], [-43.25, 65.0], [-43.47, 64.47], [-43.82, 64.32], [-43.85, 64.25], [-43.82, 64.18], [-43.47, 64.03], [-43.32, 63.68], [-43.25, 63.65], [-43.0, 63.75], [-42.47, 63.53], [-42.25, 63.0], [-42.47, 62.47], [-43.0, 62.25], [-43.25, 62.35], [-43.5, 62.25], [-44.03, 62.47], [-44.18, 62.82], [-44.25, 62.85], [-44.5, 62.75], [-45.0, 62.96], [-45.5, 62.75], [-45.75, 62.85], [-46.0, 62.75], [-46.25, 62.85], [-46.5, 62.75], [-46.75, 62.85], [-47.0, 62.75], [-47.25, 62.85], [-47.5, 62.75], [-47.75, 62.85], [-48.0, 62.75], [-48.25, 62.85], [-48.5, 62.75], [-48.75, 62.85], [-49.0, 62.75], [-49.25, 62.85], [-49.5, 62.75], [-50.03, 62.97], [-50.18, 63.32], [-50.53, 63.47], [-50.75, 64.0], [-50.65, 64.25], [-50.75, 64.5], [-50.62, 64.8], [-51.03, 64.97], [-51.18, 65.32], [-51.25, 65.35], [-51.5, 65.25], [-51.75, 65.35], [-52.0, 65.25], [-52.53, 65.47], [-52.75, 66.0], [-52.54, 66.5], [-52.75, 67.0], [-52.62, 67.3], [-52.75, 67.35], [-53.0, 67.25], [-53.25, 67.35], [-53.5, 67.25], [-54.03, 67.47], [-54.25, 68.0], [-54.03, 68.53], [-53.68, 68.68], [-53.53, 69.03], [-53.0, 69.25]]]]}, "2011-09-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-52.53, 65.47], [-52.75, 66.0], [-52.53, 66.53], [-52.0, 66.75], [-51.75, 66.65], [-51.5, 66.75], [-51.25, 66.65], [-51.0, 66.75], [-50.75, 66.65], [-50.68, 66.68], [-50.65, 66.75], [-50.75, 67.0], [-50.54, 67.5], [-50.68, 67.82], [-50.75, 67.85], [-51.0, 67.75], [-51.53, 67.97], [-51.75, 68.5], [-51.53, 69.03], [-51.0, 69.25], [-50.75, 69.15], [-50.68, 69.18], [-50.53, 69.53], [-50.18, 69.68], [-50.15, 69.75], [-50.25, 70.0], [-50.03, 70.53], [-49.5, 70.75], [-48.97, 70.53], [-48.82, 70.18], [-48.75, 70.15], [-48.5, 70.25], [-47.97, 70.03], [-47.82, 69.68], [-47.75, 69.65], [-47.5, 69.75], [-46.97, 69.53], [-46.82, 69.18], [-46.47, 69.03], [-46.32, 68.68], [-45.97, 68.53], [-45.82, 68.18], [-45.47, 68.03], [-45.25, 67.5], [-45.35, 67.25], [-45.32, 67.18], [-45.25, 67.15], [-45.0, 67.25], [-44.47, 67.03], [-44.25, 66.5], [-44.35, 66.25], [-44.32, 66.18], [-43.97, 66.03], [-43.82, 65.68], [-43.47, 65.53], [-43.25, 65.0], [-43.47, 64.47], [-43.82, 64.32], [-43.85, 64.25], [-43.82, 64.18], [-43.47, 64.03], [-43.32, 63.68], [-43.25, 63.65], [-43.0, 63.75], [-42.47, 63.53], [-42.25, 63.0], [-42.47, 62.47], [-43.0, 62.25], [-43.25, 62.35], [-43.5, 62.25], [-44.03, 62.47], [-44.18, 62.82], [-44.25, 62.85], [-44.5, 62.75], [-45.0, 62.96], [-45.5, 62.75], [-45.75, 62.85], [-46.0, 62.75], [-46.25, 62.85], [-46.5, 62.75], [-46.75, 62.85], [-47.0, 62.75], [-47.25, 62.85], [-47.5, 62.75], [-47.75, 62.85], [-48.0, 62.75], [-48.25, 62.85], [-48.5, 62.75], [-48.75, 62.85], [-49.0, 62.75], [-49.25, 62.85], [-49.5, 62.75], [-50.03, 62.97], [-50.18, 63.32], [-50.53, 63.47], [-50.75, 64.0], [-50.53, 64.53], [-50.18, 64.68], [-50.15, 64.75], [-50.18, 64.82], [-50.53, 64.97], [-50.68, 65.32], [-50.75, 65.35], [-51.0, 65.25], [-51.25, 65.35], [-51.5, 65.25], [-51.75, 65.35], [-52.0, 65.25], [-52.53, 65.47]]]]}, "2011-09-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-50.53, 63.47], [-50.75, 64.0], [-50.53, 64.53], [-50.0, 64.75], [-49.47, 64.53], [-49.25, 64.0], [-49.47, 63.47], [-50.0, 63.25], [-50.53, 63.47]]], [[[-47.25, 64.5], [-47.03, 65.03], [-46.68, 65.18], [-46.53, 65.53], [-46.18, 65.68], [-46.03, 66.03], [-45.5, 66.25], [-44.97, 66.03], [-44.82, 65.68], [-44.75, 65.65], [-44.5, 65.75], [-44.25, 65.65], [-44.0, 65.75], [-43.47, 65.53], [-43.25, 65.0], [-43.47, 64.47], [-43.82, 64.32], [-43.85, 64.25], [-43.82, 64.18], [-43.47, 64.03], [-43.32, 63.68], [-43.25, 63.65], [-43.0, 63.75], [-42.47, 63.53], [-42.25, 63.0], [-42.47, 62.47], [-43.0, 62.25], [-43.25, 62.35], [-43.5, 62.25], [-44.03, 62.47], [-44.18, 62.82], [-44.25, 62.85], [-44.5, 62.75], [-45.0, 62.96], [-45.5, 62.75], [-45.75, 62.85], [-46.0, 62.75], [-46.25, 62.85], [-46.5, 62.75], [-47.03, 62.97], [-47.25, 63.5], [-47.15, 63.75], [-47.25, 64.0], [-47.15, 64.25], [-47.25, 64.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -12.203305927525292}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -8.294418719789377}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-9.507128364902655, -16.274556034477598, -17.184652706097893, -16.961540966123835, -17.897733647116723, -21.513949999163287]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-13.759916018291449, -25.156661592627046, -24.5755277638236, -25.81968067492778, -24.795800667425482, -25.132614675573024]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.015398824983322, -7.896364306365549, -8.745901234016571, -8.520014465968456, -8.230180324490467, -7.661425612161831]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.613875173732936, -10.783589895283484, -12.203305927525292, -11.73011542561062, -9.801633235496752, -9.647735497424975]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.3884452842548685, -2.002244140214322, -2.0611070893113355, -1.8664309102094498, -1.700453549009971, -1.6352506380633376]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.4736287952429226, -2.6938449010625294, -2.7137613734186297, -2.4275263514273537, -2.116254321091028, -1.9597145077019638]}}