{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-03-19 18:23:40.075215", "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-22_to_2021-Apr-26_140.0_63.5"}, "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": 2021040000997}, "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 22 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 26 2021"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 5}, "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": 137122.86890702206}, "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": ["Russian Federation"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Europe"]}, "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": 63.5}, "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": 140.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "140.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 137.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 145.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 60.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 66.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "Polygon", "coordinates": [[[143.75, 62.646], [144.0, 62.75], [144.25, 62.646], [144.5, 62.75], [144.75, 62.646], [145.0, 62.75], [145.25, 62.646], [145.5, 62.75], [146.03, 62.53], [146.25, 62.0], [146.03, 61.47], [145.677, 61.323], [145.53, 60.97], [145.177, 60.823], [145.03, 60.47], [144.5, 60.25], [143.97, 60.47], [143.823, 60.823], [143.75, 60.854], [143.5, 60.75], [143.25, 60.854], [143.0, 60.75], [142.75, 60.854], [142.5, 60.75], [142.25, 60.854], [142.0, 60.75], [141.75, 60.854], [141.5, 60.75], [141.25, 60.854], [141.0, 60.75], [140.75, 60.854], [140.749, 60.854], [140.5, 60.75], [140.251, 60.854], [140.25, 60.854], [140.203, 60.834], [140.177, 60.823], [140.03, 60.47], [139.677, 60.323], [139.53, 59.97], [139.177, 59.823], [139.03, 59.47], [138.5, 59.25], [137.97, 59.47], [137.75, 60.0], [137.97, 60.53], [138.323, 60.677], [138.354, 60.75], [138.323, 60.823], [138.25, 60.854], [138.0, 60.75], [137.75, 60.854], [137.5, 60.75], [136.97, 60.97], [136.75, 61.5], [136.854, 61.75], [136.75, 62.0], [136.854, 62.25], [136.75, 62.5], [136.854, 62.75], [136.75, 63.0], [136.97, 63.53], [137.323, 63.677], [137.354, 63.75], [137.25, 64.0], [137.354, 64.25], [137.25, 64.5], [137.47, 65.03], [137.823, 65.177], [137.97, 65.53], [138.5, 65.75], [138.802, 65.625], [138.97, 66.03], [139.5, 66.25], [139.75, 66.146], [139.823, 66.177], [139.97, 66.53], [140.5, 66.75], [140.75, 66.646], [141.0, 66.75], [141.53, 66.53], [141.677, 66.177], [141.75, 66.146], [142.0, 66.25], [142.53, 66.03], [142.677, 65.677], [143.03, 65.53], [143.25, 65.0], [143.03, 64.47], [142.677, 64.323], [142.543, 64.0], [142.75, 63.5], [142.625, 63.198], [143.03, 63.03], [143.198, 62.625], [143.5, 62.75], [143.75, 62.646]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Russian-Arctic", "Russian-Far-East"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-04-22T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[137.35355339059328, 63.75], [137.25, 64.0], [137.35355339059328, 64.25], [137.25, 64.5], [137.46966991411009, 65.03033008588991], [137.82322330470336, 65.17677669529664], [137.96966991411009, 65.53033008588991], [138.5, 65.75], [139.03033008588991, 65.53033008588991], [139.17677669529664, 65.17677669529664], [139.25, 65.14644660940672], [139.5, 65.25], [139.75, 65.14644660940672], [140.0, 65.25], [140.25, 65.14644660940672], [140.5, 65.25], [140.75, 65.14644660940672], [141.0, 65.25], [141.25, 65.14644660940672], [141.5, 65.25], [142.03033008588991, 65.03033008588991], [142.25, 64.5], [142.14644660940672, 64.25], [142.17677669529664, 64.17677669529664], [142.53033008588991, 64.03033008588991], [142.75, 63.5], [142.53033008588991, 62.96966991411009], [142.0, 62.75], [141.75, 62.85355339059328], [141.67677669529664, 62.82322330470336], [141.53033008588991, 62.46966991411009], [141.0, 62.25], [140.75, 62.35355339059328], [140.5, 62.25], [140.25, 62.35355339059328], [140.0, 62.25], [139.75, 62.35355339059328], [139.5, 62.25], [139.25, 62.35355339059328], [139.0, 62.25], [138.75, 62.35355339059328], [138.5, 62.25], [137.96966991411009, 62.46966991411009], [137.82322330470336, 62.82322330470336], [137.46966991411009, 62.96966991411009], [137.25, 63.5], [137.35355339059328, 63.75]]]}, "2021-04-23T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[136.85355339059328, 61.75], [136.75, 62.0], [136.85355339059328, 62.25], [136.75, 62.5], [136.85355339059328, 62.75], [136.75, 63.0], [136.96966991411009, 63.53033008588991], [137.32322330470336, 63.67677669529664], [137.35355339059328, 63.75], [137.25, 64.0], [137.35355339059328, 64.25], [137.25, 64.5], [137.46966991411009, 65.03033008588991], [137.82322330470336, 65.17677669529664], [137.96966991411009, 65.53033008588991], [138.5, 65.75], [138.80177669529664, 65.625], [138.96966991411009, 66.03033008588991], [139.5, 66.25], [139.75, 66.14644660940672], [139.82322330470336, 66.17677669529664], [139.96966991411009, 66.53033008588991], [140.5, 66.75], [140.75, 66.64644660940672], [141.0, 66.75], [141.53033008588991, 66.53033008588991], [141.67677669529664, 66.17677669529664], [141.75, 66.14644660940672], [142.0, 66.25], [142.53033008588991, 66.03033008588991], [142.67677669529664, 65.67677669529664], [143.03033008588991, 65.53033008588991], [143.25, 65.0], [143.03033008588991, 64.46966991411009], [142.67677669529664, 64.32322330470336], [142.54289321881345, 64.0], [142.75, 63.5], [142.625, 63.19822330470336], [143.03033008588991, 63.03033008588991], [143.25, 62.5], [143.14644660940672, 62.25], [143.25, 62.0], [143.03033008588991, 61.46966991411009], [142.5, 61.25], [142.25, 61.35355339059328], [142.17677669529664, 61.32322330470336], [142.03033008588991, 60.96966991411009], [141.5, 60.75], [141.25, 60.85355339059328], [141.0, 60.75], [140.75, 60.85355339059328], [140.5, 60.75], [140.25, 60.85355339059328], [140.17677669529664, 60.82322330470336], [140.03033008588991, 60.46966991411009], [139.67677669529664, 60.32322330470336], [139.53033008588991, 59.96966991411009], [139.17677669529664, 59.82322330470336], [139.03033008588991, 59.46966991411009], [138.5, 59.25], [137.96966991411009, 59.46966991411009], [137.75, 60.0], [137.96966991411009, 60.53033008588991], [138.32322330470336, 60.67677669529664], [138.35355339059328, 60.75], [138.32322330470336, 60.82322330470336], [138.25, 60.85355339059328], [138.0, 60.75], [137.75, 60.85355339059328], [137.5, 60.75], [136.96966991411009, 60.96966991411009], [136.75, 61.5], [136.85355339059328, 61.75]]]}, "2021-04-24T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[136.85355339059328, 61.75], [136.75, 62.0], [136.85355339059328, 62.25], [136.75, 62.5], [136.85355339059328, 62.75], [136.75, 63.0], [136.96966991411009, 63.53033008588991], [137.32322330470336, 63.67677669529664], [137.35355339059328, 63.75], [137.25, 64.0], [137.35355339059328, 64.25], [137.25, 64.5], [137.46966991411009, 65.03033008588991], [137.82322330470336, 65.17677669529664], [137.96966991411009, 65.53033008588991], [138.5, 65.75], [138.80177669529664, 65.625], [138.96966991411009, 66.03033008588991], [139.5, 66.25], [139.75, 66.14644660940672], [139.82322330470336, 66.17677669529664], [139.96966991411009, 66.53033008588991], [140.5, 66.75], [140.75, 66.64644660940672], [141.0, 66.75], [141.53033008588991, 66.53033008588991], [141.67677669529664, 66.17677669529664], [141.75, 66.14644660940672], [142.0, 66.25], [142.53033008588991, 66.03033008588991], [142.67677669529664, 65.67677669529664], [143.03033008588991, 65.53033008588991], [143.25, 65.0], [143.03033008588991, 64.46966991411009], [142.67677669529664, 64.32322330470336], [142.54289321881345, 64.0], [142.75, 63.5], [142.625, 63.19822330470336], [143.03033008588991, 63.03033008588991], [143.19822330470336, 62.625], [143.5, 62.75], [143.75, 62.64644660940672], [144.0, 62.75], [144.25, 62.64644660940672], [144.5, 62.75], [144.75, 62.64644660940672], [145.0, 62.75], [145.25, 62.64644660940672], [145.5, 62.75], [146.03033008588991, 62.53033008588991], [146.25, 62.0], [146.03033008588991, 61.46966991411009], [145.67677669529664, 61.32322330470336], [145.53033008588991, 60.96966991411009], [145.17677669529664, 60.82322330470336], [145.03033008588991, 60.46966991411009], [144.5, 60.25], [143.96966991411009, 60.46966991411009], [143.82322330470336, 60.82322330470336], [143.75, 60.85355339059328], [143.5, 60.75], [143.25, 60.85355339059328], [143.0, 60.75], [142.75, 60.85355339059328], [142.5, 60.75], [142.25, 60.85355339059328], [142.0, 60.75], [141.75, 60.85355339059328], [141.5, 60.75], [141.25, 60.85355339059328], [141.0, 60.75], [140.75, 60.85355339059328], [140.5, 60.75], [140.25, 60.85355339059328], [140.17677669529664, 60.82322330470336], [140.03033008588991, 60.46966991411009], [139.67677669529664, 60.32322330470336], [139.53033008588991, 59.96966991411009], [139.17677669529664, 59.82322330470336], [139.03033008588991, 59.46966991411009], [138.5, 59.25], [137.96966991411009, 59.46966991411009], [137.75, 60.0], [137.96966991411009, 60.53033008588991], [138.32322330470336, 60.67677669529664], [138.35355339059328, 60.75], [138.32322330470336, 60.82322330470336], [138.25, 60.85355339059328], [138.0, 60.75], [137.75, 60.85355339059328], [137.5, 60.75], [136.96966991411009, 60.96966991411009], [136.75, 61.5], [136.85355339059328, 61.75]]]}, "2021-04-25T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[136.85355339059328, 61.75], [136.75, 62.0], [136.85355339059328, 62.25], [136.75, 62.5], [136.85355339059328, 62.75], [136.75, 63.0], [136.96966991411009, 63.53033008588991], [137.32322330470336, 63.67677669529664], [137.35355339059328, 63.75], [137.25, 64.0], [137.46966991411009, 64.53033008588991], [138.0, 64.75], [138.25, 64.64644660940672], [138.5, 64.75], [138.75, 64.64644660940672], [138.875, 64.69822330470336], [138.75, 65.0], [138.85355339059328, 65.25], [138.75, 65.5], [138.96966991411009, 66.03033008588991], [139.5, 66.25], [139.75, 66.14644660940672], [139.82322330470336, 66.17677669529664], [139.96966991411009, 66.53033008588991], [140.5, 66.75], [140.75, 66.64644660940672], [141.0, 66.75], [141.53033008588991, 66.53033008588991], [141.67677669529664, 66.17677669529664], [141.75, 66.14644660940672], [142.0, 66.25], [142.53033008588991, 66.03033008588991], [142.67677669529664, 65.67677669529664], [143.03033008588991, 65.53033008588991], [143.25, 65.0], [143.03033008588991, 64.46966991411009], [142.67677669529664, 64.32322330470336], [142.54289321881345, 64.0], [142.75, 63.5], [142.625, 63.19822330470336], [143.03033008588991, 63.03033008588991], [143.19822330470336, 62.625], [143.5, 62.75], [143.75, 62.64644660940672], [144.0, 62.75], [144.25, 62.64644660940672], [144.5, 62.75], [144.75, 62.64644660940672], [145.0, 62.75], [145.25, 62.64644660940672], [145.5, 62.75], [146.03033008588991, 62.53033008588991], [146.25, 62.0], [146.03033008588991, 61.46966991411009], [145.67677669529664, 61.32322330470336], [145.53033008588991, 60.96966991411009], [145.17677669529664, 60.82322330470336], [145.03033008588991, 60.46966991411009], [144.5, 60.25], [143.96966991411009, 60.46966991411009], [143.82322330470336, 60.82322330470336], [143.75, 60.85355339059328], [143.5, 60.75], [143.25, 60.85355339059328], [143.0, 60.75], [142.75, 60.85355339059328], [142.5, 60.75], [142.25, 60.85355339059328], [142.0, 60.75], [141.75, 60.85355339059328], [141.5, 60.75], [141.25, 60.85355339059328], [141.0, 60.75], [140.75, 60.85355339059328], [140.5, 60.75], [140.25, 60.85355339059328], [140.17677669529664, 60.82322330470336], [140.03033008588991, 60.46966991411009], [139.67677669529664, 60.32322330470336], [139.53033008588991, 59.96966991411009], [139.17677669529664, 59.82322330470336], [139.03033008588991, 59.46966991411009], [138.5, 59.25], [137.96966991411009, 59.46966991411009], [137.75, 60.0], [137.96966991411009, 60.53033008588991], [138.32322330470336, 60.67677669529664], [138.35355339059328, 60.75], [138.32322330470336, 60.82322330470336], [138.25, 60.85355339059328], [138.0, 60.75], [137.75, 60.85355339059328], [137.5, 60.75], [136.96966991411009, 60.96966991411009], [136.75, 61.5], [136.85355339059328, 61.75]]]}, "2021-04-26T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[138.85355339059328, 62.25], [138.75, 62.5], [138.96966991411009, 63.03033008588991], [139.5, 63.25], [139.75, 63.14644660940672], [140.0, 63.25], [140.53033008588991, 63.03033008588991], [140.67677669529664, 62.67677669529664], [141.0, 62.542893218813454], [141.5, 62.75], [141.75, 62.64644660940672], [142.0, 62.75], [142.53033008588991, 62.53033008588991], [142.67677669529664, 62.17677669529664], [142.75, 62.14644660940672], [142.82322330470336, 62.17677669529664], [142.96966991411009, 62.53033008588991], [143.5, 62.75], [143.75, 62.64644660940672], [144.0, 62.75], [144.25, 62.64644660940672], [144.5, 62.75], [144.75, 62.64644660940672], [145.0, 62.75], [145.25, 62.64644660940672], [145.5, 62.75], [146.03033008588991, 62.53033008588991], [146.25, 62.0], [146.03033008588991, 61.46966991411009], [145.67677669529664, 61.32322330470336], [145.53033008588991, 60.96966991411009], [145.17677669529664, 60.82322330470336], [145.03033008588991, 60.46966991411009], [144.5, 60.25], [143.96966991411009, 60.46966991411009], [143.82322330470336, 60.82322330470336], [143.75, 60.85355339059328], [143.5, 60.75], [143.25, 60.85355339059328], [143.0, 60.75], [142.75, 60.85355339059328], [142.5, 60.75], [142.25, 60.85355339059328], [142.0, 60.75], [141.75, 60.85355339059328], [141.5, 60.75], [141.25, 60.85355339059328], [141.0, 60.75], [140.5, 60.957106781186546], [140.0, 60.75], [139.46966991411009, 60.96966991411009], [139.32322330470336, 61.32322330470336], [138.96966991411009, 61.46966991411009], [138.75, 62.0], [138.85355339059328, 62.25]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -14.812787865324907}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -7.105560454853424}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-16.72986418029376, -15.625277679783608, -18.026139740444762, -15.905156235741288, -13.276276395863704]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-19.956072497063587, -21.67051175054496, -25.140363013261123, -19.93659111130907, -14.892303728450315]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-6.4462910297566625, -6.097034733035948, -8.850087005896016, -7.078642656961309, -4.425606592217563]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-8.838902596877176, -9.63136630602611, -14.812787865324907, -10.182143128386343, -5.741662530263341]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.783622916853698, -1.7580342548641654, -2.646599689620642, -2.2149082624939105, -1.55313926463104]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.4554583080246264, -2.697951805561354, -4.519068427606469, -3.495749885685937, -1.930537739194096]}}