{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 08:49:07.883224", "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-Dec-23_to_2012-Jan-02_349.5_31.0"}, "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": 2011120001218}, "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 23 2011"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 02 2012"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 11}, "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": 64064.70405713778}, "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": ["Morocco"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.Atlantic-Ocean", "Sahara"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Africa"]}, "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": ["North Atlantic Ocean"]}, "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": 31.0}, "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": 349.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "349.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 346.75}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 350.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 28.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 32.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2011-12-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-10.0, 30.75], [-9.47, 30.53], [-9.25, 30.0], [-9.47, 29.47], [-10.0, 29.25], [-10.53, 29.47], [-10.75, 30.0], [-10.53, 30.53], [-10.0, 30.75]]]]}, "2011-12-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-11.53, 31.03], [-11.18, 31.18], [-11.03, 31.53], [-10.68, 31.68], [-10.53, 32.03], [-10.0, 32.25], [-9.47, 32.03], [-9.25, 31.5], [-9.35, 31.25], [-9.25, 31.0], [-9.46, 30.5], [-9.25, 30.0], [-9.47, 29.47], [-10.0, 29.25], [-10.5, 29.46], [-11.0, 29.25], [-11.53, 29.47], [-11.75, 30.0], [-11.65, 30.25], [-11.75, 30.5], [-11.53, 31.03]]]]}, "2011-12-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-12.53, 31.03], [-12.18, 31.18], [-12.03, 31.53], [-11.5, 31.75], [-11.25, 31.65], [-11.0, 31.75], [-10.75, 31.65], [-10.68, 31.68], [-10.53, 32.03], [-10.0, 32.25], [-9.47, 32.03], [-9.25, 31.5], [-9.35, 31.25], [-9.25, 31.0], [-9.46, 30.5], [-9.25, 30.0], [-9.47, 29.47], [-10.0, 29.25], [-10.5, 29.46], [-11.0, 29.25], [-11.5, 29.46], [-12.0, 29.25], [-12.53, 29.47], [-12.75, 30.0], [-12.65, 30.25], [-12.75, 30.5], [-12.53, 31.03]]]]}, "2011-12-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-12.53, 31.03], [-12.18, 31.18], [-12.03, 31.53], [-11.5, 31.75], [-11.25, 31.65], [-11.0, 31.75], [-10.75, 31.65], [-10.68, 31.68], [-10.53, 32.03], [-10.0, 32.25], [-9.47, 32.03], [-9.25, 31.5], [-9.35, 31.25], [-9.25, 31.0], [-9.47, 30.47], [-9.82, 30.32], [-9.97, 29.97], [-10.32, 29.82], [-10.47, 29.47], [-11.0, 29.25], [-11.5, 29.46], [-12.0, 29.25], [-12.53, 29.47], [-12.75, 30.0], [-12.65, 30.25], [-12.75, 30.5], [-12.53, 31.03]]]]}, "2011-12-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-12.53, 31.03], [-12.18, 31.18], [-12.03, 31.53], [-11.5, 31.75], [-11.25, 31.65], [-11.0, 31.75], [-10.75, 31.65], [-10.5, 31.75], [-10.25, 31.65], [-10.0, 31.75], [-9.47, 31.53], [-9.25, 31.0], [-9.47, 30.47], [-9.82, 30.32], [-9.97, 29.97], [-10.5, 29.75], [-11.0, 29.96], [-11.32, 29.82], [-11.47, 29.47], [-12.0, 29.25], [-12.53, 29.47], [-12.75, 30.0], [-12.65, 30.25], [-12.75, 30.5], [-12.53, 31.03]]]]}, "2011-12-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-12.03, 28.97], [-12.25, 29.5], [-12.03, 30.03], [-11.5, 30.25], [-11.25, 30.15], [-11.12, 30.2], [-11.25, 30.5], [-11.15, 30.75], [-11.25, 31.0], [-11.03, 31.53], [-10.5, 31.75], [-10.25, 31.65], [-10.0, 31.75], [-9.47, 31.53], [-9.25, 31.0], [-9.47, 30.47], [-9.82, 30.32], [-9.96, 30.0], [-9.75, 29.5], [-9.97, 28.97], [-10.5, 28.75], [-10.75, 28.85], [-11.0, 28.75], [-11.25, 28.85], [-11.5, 28.75], [-12.03, 28.97]]]]}, "2011-12-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-11.25, 30.15], [-11.0, 30.25], [-10.75, 30.15], [-10.5, 30.25], [-9.97, 30.03], [-9.75, 29.5], [-9.97, 28.97], [-10.5, 28.75], [-10.75, 28.85], [-11.0, 28.75], [-11.25, 28.85], [-11.32, 28.82], [-11.47, 28.47], [-12.0, 28.25], [-12.53, 28.47], [-12.75, 29.0], [-12.53, 29.53], [-12.18, 29.68], [-12.03, 30.03], [-11.5, 30.25], [-11.25, 30.15]]], [[[-11.03, 31.53], [-10.5, 31.75], [-9.97, 31.53], [-9.75, 31.0], [-9.97, 30.47], [-10.5, 30.25], [-11.03, 30.47], [-11.25, 31.0], [-11.03, 31.53]]]]}, "2011-12-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-12.68, 30.68], [-12.53, 31.03], [-12.18, 31.18], [-12.03, 31.53], [-11.5, 31.75], [-11.25, 31.65], [-11.18, 31.68], [-11.03, 32.03], [-10.68, 32.18], [-10.53, 32.53], [-10.0, 32.75], [-9.47, 32.53], [-9.25, 32.0], [-9.35, 31.75], [-9.25, 31.5], [-9.35, 31.25], [-9.25, 31.0], [-9.47, 30.47], [-9.82, 30.32], [-9.85, 30.25], [-9.75, 30.0], [-9.85, 29.75], [-9.75, 29.5], [-9.97, 28.97], [-10.5, 28.75], [-10.75, 28.85], [-11.0, 28.75], [-11.25, 28.85], [-11.32, 28.82], [-11.47, 28.47], [-12.0, 28.25], [-12.53, 28.47], [-12.68, 28.82], [-12.75, 28.85], [-13.0, 28.75], [-13.53, 28.97], [-13.75, 29.5], [-13.53, 30.03], [-13.18, 30.18], [-13.03, 30.53], [-12.68, 30.68]]]]}, "2011-12-31T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-12.68, 30.68], [-12.53, 31.03], [-12.18, 31.18], [-12.03, 31.53], [-11.5, 31.75], [-11.25, 31.65], [-11.18, 31.68], [-11.03, 32.03], [-10.68, 32.18], [-10.53, 32.53], [-10.0, 32.75], [-9.47, 32.53], [-9.25, 32.0], [-9.35, 31.75], [-9.25, 31.5], [-9.35, 31.25], [-9.25, 31.0], [-9.47, 30.47], [-9.82, 30.32], [-9.85, 30.25], [-9.75, 30.0], [-9.85, 29.75], [-9.75, 29.5], [-9.85, 29.25], [-9.75, 29.0], [-9.97, 28.47], [-10.5, 28.25], [-11.03, 28.47], [-11.18, 28.82], [-11.25, 28.85], [-11.32, 28.82], [-11.47, 28.47], [-12.0, 28.25], [-12.53, 28.47], [-12.68, 28.82], [-12.75, 28.85], [-13.0, 28.75], [-13.53, 28.97], [-13.75, 29.5], [-13.53, 30.03], [-13.18, 30.18], [-13.03, 30.53], [-12.68, 30.68]]]]}, "2012-01-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-12.68, 30.68], [-12.53, 31.03], [-12.18, 31.18], [-12.03, 31.53], [-11.5, 31.75], [-11.25, 31.65], [-11.18, 31.68], [-11.03, 32.03], [-10.68, 32.18], [-10.53, 32.53], [-10.0, 32.75], [-9.47, 32.53], [-9.25, 32.0], [-9.35, 31.75], [-9.25, 31.5], [-9.35, 31.25], [-9.25, 31.0], [-9.47, 30.47], [-9.82, 30.32], [-9.85, 30.25], [-9.75, 30.0], [-9.85, 29.75], [-9.75, 29.5], [-9.85, 29.25], [-9.75, 29.0], [-9.97, 28.47], [-10.5, 28.25], [-11.03, 28.47], [-11.18, 28.82], [-11.25, 28.85], [-11.32, 28.82], [-11.47, 28.47], [-12.0, 28.25], [-12.53, 28.47], [-12.68, 28.82], [-12.75, 28.85], [-13.0, 28.75], [-13.53, 28.97], [-13.75, 29.5], [-13.53, 30.03], [-13.18, 30.18], [-13.03, 30.53], [-12.68, 30.68]]]]}, "2012-01-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-11.03, 30.03], [-10.5, 30.25], [-9.97, 30.03], [-9.75, 29.5], [-9.85, 29.25], [-9.75, 29.0], [-9.97, 28.47], [-10.5, 28.25], [-11.03, 28.47], [-11.25, 29.0], [-11.15, 29.25], [-11.25, 29.5], [-11.03, 30.03]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -2.678982414394625}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -1.5143152654860097}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [15.744252165483772, 15.58957303833273, 15.756033299567264, 16.02464599587927, 16.235537602265936, 16.123758525961364, 16.427967419153674, 16.066751444162207, 15.855230342937546, 15.742713151454211, 14.737750721628345]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [15.744252165483772, 14.932655217190415, 14.592164826534884, 14.947368621760234, 15.285846329715298, 15.29799182877042, 15.883266077526798, 14.80689724983057, 13.654046479512488, 13.09889632594053, 13.413208143396048]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-1.7342604915314155, -1.8062654448941982, -1.8380090347310774, -1.5317890678780373, -1.3488052310131806, -1.462625870193354, -1.306290273378636, -1.3884565357466736, -1.4722987981143734, -1.4840153600010684, -1.8975036149291498]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-1.7342604915314155, -2.3591793621807824, -2.4893530396367396, -1.6133063187627954, -1.5354287198741758, -1.5766330840327214, -1.4330784688203835, -1.5796417591236604, -2.272151831851545, -2.678982414394625, -2.3260830865490334]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4129579674517025, -1.4898329221395958, -1.590519618579093, -1.356398095859593, -1.2292685932221905, -1.337049695034695, -1.400913079697605, -1.45027450282024, -1.5018236046125608, -1.5547865364709765, -1.4844855120093146]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.4129579674517025, -1.9339604319003105, -2.0842715973020667, -1.5092858314727933, -1.2878208629007273, -1.4312535099742498, -1.5931637252337307, -1.637702555258936, -1.6895318254429743, -2.138065756193944, -1.5870625348940521]}}