{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-03-19 18:23:41.443411", "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-Apr-25_to_2021-May-03_94.5_30.5"}, "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": 2021040001101}, "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 25 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 03 2021"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 9}, "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": 76633.19083013808}, "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": ["China"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Asia"]}, "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": 30.5}, "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": 94.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "94.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 92.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 96.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 29.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 33.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "Polygon", "coordinates": [[[91.47, 31.03], [92.0, 31.25], [92.25, 31.146], [92.323, 31.177], [92.375, 31.302], [91.97, 31.47], [91.75, 32.0], [91.854, 32.25], [91.75, 32.5], [91.97, 33.03], [92.5, 33.25], [92.75, 33.146], [93.0, 33.25], [93.25, 33.146], [93.323, 33.177], [93.47, 33.53], [94.0, 33.75], [94.53, 33.53], [94.75, 33.0], [94.625, 32.698], [94.75, 32.646], [95.0, 32.75], [95.53, 32.53], [95.677, 32.177], [96.03, 32.03], [96.25, 31.5], [96.125, 31.198], [96.25, 31.146], [96.5, 31.25], [97.03, 31.03], [97.25, 30.5], [97.03, 29.97], [96.677, 29.823], [96.53, 29.47], [96.0, 29.25], [95.47, 29.47], [95.323, 29.823], [95.251, 29.854], [95.25, 29.854], [95.0, 29.75], [94.751, 29.854], [94.75, 29.854], [94.5, 29.75], [94.25, 29.854], [94.177, 29.823], [94.03, 29.47], [93.677, 29.323], [93.53, 28.97], [93.0, 28.75], [92.47, 28.97], [92.25, 29.5], [92.375, 29.802], [92.25, 29.854], [92.0, 29.75], [91.47, 29.97], [91.25, 30.5], [91.47, 31.03]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Tibetan-Plateau"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-04-25T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[91.85355339059328, 32.25], [91.75, 32.5], [91.96966991411009, 33.03033008588991], [92.5, 33.25], [92.75, 33.14644660940672], [93.0, 33.25], [93.25, 33.14644660940672], [93.5, 33.25], [94.03033008588991, 33.03033008588991], [94.25, 32.5], [94.03033008588991, 31.96966991411009], [93.67677669529664, 31.82322330470336], [93.53033008588991, 31.46966991411009], [93.0, 31.25], [92.75, 31.353553390593273], [92.5, 31.25], [91.96966991411009, 31.46966991411009], [91.75, 32.0], [91.85355339059328, 32.25]]]}, "2021-04-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[92.53033008588991, 29.96966991411009], [92.0, 29.75], [91.46966991411009, 29.96966991411009], [91.25, 30.5], [91.46966991411009, 31.03033008588991], [92.0, 31.25], [92.53033008588991, 31.03033008588991], [92.75, 30.5], [92.53033008588991, 29.96966991411009]]], [[[96.5, 29.75], [95.96966991411009, 29.96966991411009], [95.75, 30.5], [95.96966991411009, 31.03033008588991], [96.5, 31.25], [97.03033008588991, 31.03033008588991], [97.25, 30.5], [97.03033008588991, 29.96966991411009], [96.5, 29.75]]], [[[91.96966991411009, 33.03033008588991], [92.5, 33.25], [92.75, 33.14644660940672], [93.0, 33.25], [93.25, 33.14644660940672], [93.5, 33.25], [94.03033008588991, 33.03033008588991], [94.17677669529664, 32.67677669529664], [94.25, 32.64644660940672], [94.5, 32.75], [95.03033008588991, 32.53033008588991], [95.25, 32.0], [95.03033008588991, 31.46966991411009], [94.5, 31.25], [94.25, 31.353553390593273], [94.0, 31.25], [93.75, 31.353553390593273], [93.5, 31.25], [93.25, 31.353553390593273], [93.0, 31.25], [92.75, 31.353553390593273], [92.5, 31.25], [91.96966991411009, 31.46966991411009], [91.75, 32.0], [91.85355339059328, 32.25], [91.75, 32.5], [91.96966991411009, 33.03033008588991]]]]}, "2021-04-27T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[91.85355339059328, 32.25], [91.75, 32.5], [91.96966991411009, 33.03033008588991], [92.5, 33.25], [92.75, 33.14644660940672], [93.0, 33.25], [93.25, 33.14644660940672], [93.32322330470336, 33.17677669529664], [93.46966991411009, 33.53033008588991], [94.0, 33.75], [94.53033008588991, 33.53033008588991], [94.75, 33.0], [94.625, 32.69822330470336], [94.75, 32.64644660940672], [95.0, 32.75], [95.53033008588991, 32.53033008588991], [95.67677669529664, 32.17677669529664], [96.03033008588991, 32.03033008588991], [96.25, 31.5], [96.07322330470336, 31.07322330470337], [96.5, 31.25], [97.03033008588991, 31.03033008588991], [97.25, 30.5], [97.03033008588991, 29.96966991411009], [96.5, 29.75], [95.96966991411009, 29.96966991411009], [95.75, 30.5], [95.53033008588991, 29.96966991411009], [95.0, 29.75], [94.75, 29.853553390593273], [94.5, 29.75], [94.25, 29.853553390593273], [94.0, 29.75], [93.46966991411009, 29.96966991411009], [93.30177669529664, 30.375], [93.17677669529664, 30.32322330470336], [93.03033008588991, 29.96966991411009], [92.5, 29.75], [92.25, 29.853553390593273], [92.0, 29.75], [91.46966991411009, 29.96966991411009], [91.25, 30.5], [91.46966991411009, 31.03033008588991], [92.0, 31.25], [92.25, 31.146446609406727], [92.32322330470336, 31.17677669529664], [92.375, 31.30177669529664], [91.96966991411009, 31.46966991411009], [91.75, 32.0], [91.85355339059328, 32.25]], [[95.75, 30.5], [95.92677669529664, 30.92677669529663], [95.67677669529664, 30.82322330470336], [95.64644660940672, 30.75], [95.75, 30.5]], [[93.75, 31.353553390593273], [93.625, 31.30177669529664], [93.69822330470336, 31.125], [94.0, 31.25], [93.75, 31.353553390593273]], [[94.0, 31.25], [94.25, 31.146446609406727], [94.32322330470336, 31.17677669529664], [94.375, 31.30177669529664], [94.25, 31.353553390593273], [94.0, 31.25]]]}, "2021-04-28T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[91.85355339059328, 32.25], [91.75, 32.5], [91.96966991411009, 33.03033008588991], [92.5, 33.25], [92.75, 33.14644660940672], [93.0, 33.25], [93.25, 33.14644660940672], [93.32322330470336, 33.17677669529664], [93.46966991411009, 33.53033008588991], [94.0, 33.75], [94.53033008588991, 33.53033008588991], [94.75, 33.0], [94.625, 32.69822330470336], [94.75, 32.64644660940672], [95.0, 32.75], [95.53033008588991, 32.53033008588991], [95.67677669529664, 32.17677669529664], [96.03033008588991, 32.03033008588991], [96.25, 31.5], [96.07322330470336, 31.07322330470337], [96.5, 31.25], [97.03033008588991, 31.03033008588991], [97.25, 30.5], [97.03033008588991, 29.96966991411009], [96.5, 29.75], [95.96966991411009, 29.96966991411009], [95.75, 30.5], [95.53033008588991, 29.96966991411009], [95.0, 29.75], [94.75, 29.853553390593273], [94.5, 29.75], [94.25, 29.853553390593273], [94.0, 29.75], [93.75, 29.853553390593273], [93.5, 29.75], [93.0, 29.957106781186546], [92.5, 29.75], [92.25, 29.853553390593273], [92.0, 29.75], [91.46966991411009, 29.96966991411009], [91.25, 30.5], [91.46966991411009, 31.03033008588991], [92.0, 31.25], [92.25, 31.146446609406727], [92.32322330470336, 31.17677669529664], [92.375, 31.30177669529664], [91.96966991411009, 31.46966991411009], [91.75, 32.0], [91.85355339059328, 32.25]], [[95.75, 30.5], [95.92677669529664, 30.92677669529663], [95.67677669529664, 30.82322330470336], [95.64644660940672, 30.75], [95.75, 30.5]]]}, "2021-04-29T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[91.85355339059328, 32.25], [91.75, 32.5], [91.96966991411009, 33.03033008588991], [92.5, 33.25], [92.75, 33.14644660940672], [93.0, 33.25], [93.25, 33.14644660940672], [93.32322330470336, 33.17677669529664], [93.46966991411009, 33.53033008588991], [94.0, 33.75], [94.53033008588991, 33.53033008588991], [94.75, 33.0], [94.625, 32.69822330470336], [94.75, 32.64644660940672], [95.0, 32.75], [95.53033008588991, 32.53033008588991], [95.67677669529664, 32.17677669529664], [96.03033008588991, 32.03033008588991], [96.25, 31.5], [96.07322330470336, 31.07322330470337], [96.5, 31.25], [97.03033008588991, 31.03033008588991], [97.25, 30.5], [97.03033008588991, 29.96966991411009], [96.67677669529664, 29.82322330470336], [96.53033008588991, 29.46966991411009], [96.0, 29.25], [95.46966991411009, 29.46966991411009], [95.30177669529664, 29.875], [95.0, 29.75], [94.75, 29.853553390593273], [94.5, 29.75], [94.25, 29.853553390593273], [94.17677669529664, 29.82322330470336], [94.03033008588991, 29.46966991411009], [93.67677669529664, 29.32322330470336], [93.53033008588991, 28.96966991411009], [93.0, 28.75], [92.46966991411009, 28.96966991411009], [92.25, 29.5], [92.375, 29.80177669529664], [92.25, 29.853553390593273], [92.0, 29.75], [91.46966991411009, 29.96966991411009], [91.25, 30.5], [91.46966991411009, 31.03033008588991], [92.0, 31.25], [92.25, 31.146446609406727], [92.32322330470336, 31.17677669529664], [92.375, 31.30177669529664], [91.96966991411009, 31.46966991411009], [91.75, 32.0], [91.85355339059328, 32.25]], [[95.69822330470336, 30.625], [95.82322330470336, 30.67677669529664], [95.92677669529664, 30.92677669529663], [95.67677669529664, 30.82322330470336], [95.64644660940672, 30.75], [95.69822330470336, 30.625]]]}, "2021-04-30T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[92.82322330470336, 30.17677669529664], [92.85355339059328, 30.25], [92.82322330470336, 30.32322330470336], [92.46966991411009, 30.46966991411009], [92.25, 31.0], [92.46966991411009, 31.53033008588991], [92.82322330470336, 31.67677669529664], [92.85355339059328, 31.75], [92.75, 32.0], [92.85355339059328, 32.25], [92.75, 32.5], [92.96966991411009, 33.03033008588991], [93.5, 33.25], [94.03033008588991, 33.03033008588991], [94.25, 32.5], [94.14644660940672, 32.25], [94.17677669529664, 32.17677669529664], [94.25, 32.14644660940672], [94.5, 32.25], [94.75, 32.14644660940672], [95.0, 32.25], [95.25, 32.14644660940672], [95.5, 32.25], [96.03033008588991, 32.03033008588991], [96.25, 31.5], [96.125, 31.19822330470336], [96.53033008588991, 31.03033008588991], [96.75, 30.5], [96.64644660940672, 30.25], [96.75, 30.0], [96.53033008588991, 29.46966991411009], [96.0, 29.25], [95.46966991411009, 29.46966991411009], [95.32322330470336, 29.82322330470336], [95.0, 29.957106781186546], [94.5, 29.75], [94.25, 29.853553390593273], [94.17677669529664, 29.82322330470336], [94.03033008588991, 29.46966991411009], [93.67677669529664, 29.32322330470336], [93.53033008588991, 28.96966991411009], [93.0, 28.75], [92.46966991411009, 28.96966991411009], [92.25, 29.5], [92.46966991411009, 30.03033008588991], [92.82322330470336, 30.17677669529664]]]}, "2021-05-01T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[92.82322330470336, 30.17677669529664], [92.85355339059328, 30.25], [92.75, 30.5], [92.96966991411009, 31.03033008588991], [93.5, 31.25], [93.75, 31.146446609406727], [94.0, 31.25], [94.25, 31.146446609406727], [94.5, 31.25], [94.75, 31.146446609406727], [95.0, 31.25], [95.25, 31.146446609406727], [95.5, 31.25], [95.75, 31.146446609406727], [96.0, 31.25], [96.53033008588991, 31.03033008588991], [96.75, 30.5], [96.64644660940672, 30.25], [96.75, 30.0], [96.53033008588991, 29.46966991411009], [96.0, 29.25], [95.46966991411009, 29.46966991411009], [95.32322330470336, 29.82322330470336], [95.25, 29.853553390593273], [95.0, 29.75], [94.75, 29.853553390593273], [94.5, 29.75], [94.25, 29.853553390593273], [94.17677669529664, 29.82322330470336], [94.03033008588991, 29.46966991411009], [93.67677669529664, 29.32322330470336], [93.53033008588991, 28.96966991411009], [93.0, 28.75], [92.46966991411009, 28.96966991411009], [92.25, 29.5], [92.46966991411009, 30.03033008588991], [92.82322330470336, 30.17677669529664]]]}, "2021-05-02T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[94.25, 29.853553390593273], [94.0, 29.75], [93.46966991411009, 29.96966991411009], [93.25, 30.5], [93.46966991411009, 31.03033008588991], [94.0, 31.25], [94.25, 31.146446609406727], [94.5, 31.25], [94.75, 31.146446609406727], [95.0, 31.25], [95.25, 31.146446609406727], [95.5, 31.25], [95.75, 31.146446609406727], [96.0, 31.25], [96.53033008588991, 31.03033008588991], [96.75, 30.5], [96.64644660940672, 30.25], [96.75, 30.0], [96.53033008588991, 29.46966991411009], [96.0, 29.25], [95.46966991411009, 29.46966991411009], [95.32322330470336, 29.82322330470336], [95.25, 29.853553390593273], [95.0, 29.75], [94.75, 29.853553390593273], [94.5, 29.75], [94.25, 29.853553390593273]]]}, "2021-05-03T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[94.25, 29.853553390593273], [94.0, 29.75], [93.46966991411009, 29.96966991411009], [93.25, 30.5], [93.46966991411009, 31.03033008588991], [94.0, 31.25], [94.25, 31.146446609406727], [94.5, 31.25], [94.75, 31.146446609406727], [95.0, 31.25], [95.25, 31.146446609406727], [95.5, 31.25], [96.03033008588991, 31.03033008588991], [96.17677669529664, 30.67677669529664], [96.53033008588991, 30.53033008588991], [96.75, 30.0], [96.53033008588991, 29.46966991411009], [96.0, 29.25], [95.46966991411009, 29.46966991411009], [95.32322330470336, 29.82322330470336], [95.25, 29.853553390593273], [95.0, 29.75], [94.75, 29.853553390593273], [94.5, 29.75], [94.25, 29.853553390593273]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -8.85594356996279}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -4.85809168327358}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-10.995207122437478, -9.660956388805289, -9.990000981616788, -10.816426110371197, -9.99236299189181, -8.366126471168627, -7.809967080671072, -7.2136174450848785, -6.548640502049011]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-12.859823121818351, -11.406604513036996, -12.484574524785387, -15.796023567616942, -12.679156461071386, -11.186665852435851, -9.449737996657632, -7.99152585182793, -7.264024679418412]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.521818142292671, -4.044201197259571, -4.836200570225906, -5.78664519043807, -5.3939098651102695, -4.2244495215367905, -4.324590068917644, -3.934664747045654, -3.650927556427939]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.336562357626292, -4.895081711090256, -6.366123561256984, -8.85594356996279, -7.016824653643141, -5.4520273799584515, -5.62091480976602, -5.188663362093621, -4.6957984195009885]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.440009121346342, -1.4334569157480703, -1.7827051817927693, -2.0752295587636884, -2.0126746846499333, -1.698302137703222, -2.0136806414003754, -2.021301310924358, -1.918180050401244]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.6861027926762528, -1.8918143688419, -2.6966673903641665, -2.9912217126197205, -2.7713424331663514, -2.4246147769837663, -2.6738326352720647, -2.5880530553161814, -2.46172086016065]}}