{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-03-19 18:26:09.979696", "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-Jul-22_to_2021-Jul-29_340.5_15.0"}, "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": 2021070000928}, "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": "July 22 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "July 29 2021"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 8}, "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": 198308.65771451892}, "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": ["Mauritania", "Senegal"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Africa", "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": ["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": 15.0}, "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": 340.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "340.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 339.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 344.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 13.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 21.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "Polygon", "coordinates": [[[-21.146, 15.75], [-21.25, 16.0], [-21.146, 16.25], [-21.25, 16.5], [-21.146, 16.75], [-21.25, 17.0], [-21.03, 17.53], [-20.677, 17.677], [-20.53, 18.03], [-20.0, 18.25], [-19.47, 18.03], [-19.323, 17.677], [-19.25, 17.646], [-19.0, 17.75], [-18.75, 17.646], [-18.677, 17.677], [-18.53, 18.03], [-18.0, 18.25], [-17.75, 18.146], [-17.677, 18.177], [-17.646, 18.25], [-17.75, 18.5], [-17.646, 18.75], [-17.75, 19.0], [-17.646, 19.25], [-17.75, 19.5], [-17.646, 19.75], [-17.75, 20.0], [-17.646, 20.25], [-17.75, 20.5], [-17.53, 21.03], [-17.177, 21.177], [-17.03, 21.53], [-16.677, 21.677], [-16.53, 22.03], [-16.0, 22.25], [-15.75, 22.146], [-15.5, 22.25], [-14.97, 22.03], [-14.75, 21.5], [-14.97, 20.97], [-15.5, 20.75], [-15.75, 20.854], [-15.823, 20.823], [-15.97, 20.47], [-16.323, 20.323], [-16.354, 20.25], [-16.25, 20.0], [-16.354, 19.75], [-16.323, 19.677], [-15.97, 19.53], [-15.823, 19.177], [-15.47, 19.03], [-15.25, 18.5], [-15.457, 18.0], [-15.25, 17.5], [-15.354, 17.25], [-15.25, 17.0], [-15.47, 16.47], [-15.823, 16.323], [-15.854, 16.25], [-15.75, 16.0], [-15.97, 15.47], [-16.323, 15.323], [-16.47, 14.97], [-17.0, 14.75], [-17.53, 14.97], [-17.677, 15.323], [-17.75, 15.354], [-17.823, 15.323], [-17.854, 15.25], [-17.75, 15.0], [-17.957, 14.5], [-17.75, 14.0], [-17.97, 13.47], [-18.5, 13.25], [-18.75, 13.354], [-18.823, 13.323], [-18.97, 12.97], [-19.5, 12.75], [-20.03, 12.97], [-20.177, 13.323], [-20.53, 13.47], [-20.677, 13.823], [-21.03, 13.97], [-21.25, 14.5], [-21.146, 14.75], [-21.25, 15.0], [-21.146, 15.25], [-21.25, 15.5], [-21.146, 15.75]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Sahara", "Western-Africa", "N.Atlantic-Ocean"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-07-22T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[-21.146446609406723, 16.25], [-21.25, 16.5], [-21.146446609406723, 16.75], [-21.25, 17.0], [-21.030330085889887, 17.53033008588991], [-20.67677669529661, 17.67677669529664], [-20.530330085889887, 18.03033008588991], [-20.0, 18.25], [-19.469669914110113, 18.03033008588991], [-19.32322330470339, 17.67677669529664], [-19.25, 17.646446609406723], [-19.0, 17.75], [-18.75, 17.646446609406723], [-18.67677669529661, 17.67677669529664], [-18.530330085889887, 18.03033008588991], [-18.0, 18.25], [-17.75, 18.146446609406723], [-17.67677669529661, 18.17677669529664], [-17.646446609406723, 18.25], [-17.75, 18.5], [-17.646446609406723, 18.75], [-17.75, 19.0], [-17.646446609406723, 19.25], [-17.75, 19.5], [-17.646446609406723, 19.75], [-17.75, 20.0], [-17.646446609406723, 20.25], [-17.75, 20.5], [-17.530330085889887, 21.03033008588991], [-17.17677669529661, 21.17677669529664], [-17.030330085889887, 21.53033008588991], [-16.67677669529661, 21.67677669529664], [-16.530330085889887, 22.03033008588991], [-16.0, 22.25], [-15.75, 22.146446609406723], [-15.5, 22.25], [-14.969669914110113, 22.03033008588991], [-14.75, 21.5], [-14.969669914110113, 20.96966991411009], [-15.5, 20.75], [-15.75, 20.853553390593277], [-15.82322330470339, 20.82322330470336], [-15.969669914110113, 20.46966991411009], [-16.32322330470339, 20.32322330470336], [-16.353553390593277, 20.25], [-16.25, 20.0], [-16.353553390593277, 19.75], [-16.32322330470339, 19.67677669529664], [-15.969669914110113, 19.53033008588991], [-15.82322330470339, 19.17677669529664], [-15.469669914110113, 19.03033008588991], [-15.25, 18.5], [-15.457106781186553, 18.0], [-15.25, 17.5], [-15.353553390593277, 17.25], [-15.25, 17.0], [-15.469669914110113, 16.46966991411009], [-15.82322330470339, 16.32322330470336], [-15.853553390593277, 16.25], [-15.75, 16.0], [-15.969669914110113, 15.469669914110089], [-16.32322330470339, 15.323223304703363], [-16.469669914110113, 14.969669914110089], [-17.0, 14.75], [-17.530330085889887, 14.969669914110089], [-17.67677669529661, 15.323223304703363], [-17.75, 15.353553390593278], [-17.82322330470339, 15.323223304703363], [-17.853553390593277, 15.25], [-17.75, 15.0], [-17.969669914110113, 14.469669914110089], [-18.32322330470339, 14.323223304703363], [-18.469669914110113, 13.969669914110089], [-19.0, 13.75], [-19.530330085889887, 13.969669914110089], [-19.67677669529661, 14.323223304703363], [-20.030330085889887, 14.469669914110089], [-20.17677669529661, 14.823223304703363], [-20.530330085889887, 14.969669914110089], [-20.67677669529661, 15.323223304703363], [-21.030330085889887, 15.469669914110089], [-21.25, 16.0], [-21.146446609406723, 16.25]]]}, "2021-07-23T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[-21.146446609406723, 14.75], [-21.25, 15.0], [-21.146446609406723, 15.25], [-21.25, 15.5], [-21.146446609406723, 15.75], [-21.25, 16.0], [-21.146446609406723, 16.25], [-21.25, 16.5], [-21.146446609406723, 16.75], [-21.25, 17.0], [-21.030330085889887, 17.53033008588991], [-20.67677669529661, 17.67677669529664], [-20.530330085889887, 18.03033008588991], [-20.0, 18.25], [-19.469669914110113, 18.03033008588991], [-19.32322330470339, 17.67677669529664], [-19.25, 17.646446609406723], [-19.0, 17.75], [-18.75, 17.646446609406723], [-18.67677669529661, 17.67677669529664], [-18.530330085889887, 18.03033008588991], [-18.0, 18.25], [-17.75, 18.146446609406723], [-17.67677669529661, 18.17677669529664], [-17.646446609406723, 18.25], [-17.75, 18.5], [-17.646446609406723, 18.75], [-17.75, 19.0], [-17.646446609406723, 19.25], [-17.75, 19.5], [-17.646446609406723, 19.75], [-17.75, 20.0], [-17.646446609406723, 20.25], [-17.75, 20.5], [-17.530330085889887, 21.03033008588991], [-17.17677669529661, 21.17677669529664], [-17.030330085889887, 21.53033008588991], [-16.67677669529661, 21.67677669529664], [-16.530330085889887, 22.03033008588991], [-16.0, 22.25], [-15.75, 22.146446609406723], [-15.5, 22.25], [-14.969669914110113, 22.03033008588991], [-14.75, 21.5], [-14.969669914110113, 20.96966991411009], [-15.5, 20.75], [-15.75, 20.853553390593277], [-15.82322330470339, 20.82322330470336], [-15.969669914110113, 20.46966991411009], [-16.32322330470339, 20.32322330470336], [-16.353553390593277, 20.25], [-16.25, 20.0], [-16.353553390593277, 19.75], [-16.32322330470339, 19.67677669529664], [-15.969669914110113, 19.53033008588991], [-15.82322330470339, 19.17677669529664], [-15.469669914110113, 19.03033008588991], [-15.25, 18.5], [-15.457106781186553, 18.0], [-15.25, 17.5], [-15.353553390593277, 17.25], [-15.25, 17.0], [-15.469669914110113, 16.46966991411009], [-15.82322330470339, 16.32322330470336], [-15.853553390593277, 16.25], [-15.75, 16.0], [-15.969669914110113, 15.469669914110089], [-16.32322330470339, 15.323223304703363], [-16.469669914110113, 14.969669914110089], [-17.0, 14.75], [-17.530330085889887, 14.969669914110089], [-17.67677669529661, 15.323223304703363], [-17.75, 15.353553390593278], [-17.82322330470339, 15.323223304703363], [-17.853553390593277, 15.25], [-17.75, 15.0], [-17.957106781186553, 14.5], [-17.75, 14.0], [-17.969669914110113, 13.469669914110089], [-18.5, 13.25], [-18.75, 13.353553390593278], [-18.82322330470339, 13.323223304703363], [-18.969669914110113, 12.969669914110089], [-19.5, 12.75], [-20.030330085889887, 12.969669914110089], [-20.17677669529661, 13.323223304703363], [-20.530330085889887, 13.469669914110089], [-20.67677669529661, 13.823223304703363], [-21.030330085889887, 13.969669914110089], [-21.25, 14.5], [-21.146446609406723, 14.75]]]}, "2021-07-24T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[-21.146446609406723, 14.75], [-21.25, 15.0], [-21.146446609406723, 15.25], [-21.25, 15.5], [-21.146446609406723, 15.75], [-21.25, 16.0], [-21.146446609406723, 16.25], [-21.25, 16.5], [-21.146446609406723, 16.75], [-21.25, 17.0], [-21.030330085889887, 17.53033008588991], [-20.67677669529661, 17.67677669529664], [-20.530330085889887, 18.03033008588991], [-20.0, 18.25], [-19.469669914110113, 18.03033008588991], [-19.32322330470339, 17.67677669529664], [-19.25, 17.646446609406723], [-19.0, 17.75], [-18.75, 17.646446609406723], [-18.67677669529661, 17.67677669529664], [-18.530330085889887, 18.03033008588991], [-18.0, 18.25], [-17.75, 18.146446609406723], [-17.67677669529661, 18.17677669529664], [-17.646446609406723, 18.25], [-17.75, 18.5], [-17.646446609406723, 18.75], [-17.75, 19.0], [-17.646446609406723, 19.25], [-17.75, 19.5], [-17.646446609406723, 19.75], [-17.75, 20.0], [-17.646446609406723, 20.25], [-17.75, 20.5], [-17.530330085889887, 21.03033008588991], [-17.17677669529661, 21.17677669529664], [-17.030330085889887, 21.53033008588991], [-16.67677669529661, 21.67677669529664], [-16.530330085889887, 22.03033008588991], [-16.0, 22.25], [-15.75, 22.146446609406723], [-15.5, 22.25], [-14.969669914110113, 22.03033008588991], [-14.75, 21.5], [-14.969669914110113, 20.96966991411009], [-15.5, 20.75], [-15.75, 20.853553390593277], [-15.82322330470339, 20.82322330470336], [-15.969669914110113, 20.46966991411009], [-16.32322330470339, 20.32322330470336], [-16.353553390593277, 20.25], [-16.25, 20.0], [-16.353553390593277, 19.75], [-16.32322330470339, 19.67677669529664], [-15.969669914110113, 19.53033008588991], [-15.82322330470339, 19.17677669529664], [-15.469669914110113, 19.03033008588991], [-15.25, 18.5], [-15.457106781186553, 18.0], [-15.25, 17.5], [-15.353553390593277, 17.25], [-15.25, 17.0], [-15.469669914110113, 16.46966991411009], [-15.82322330470339, 16.32322330470336], [-15.853553390593277, 16.25], [-15.75, 16.0], [-15.969669914110113, 15.469669914110089], [-16.32322330470339, 15.323223304703363], [-16.469669914110113, 14.969669914110089], [-17.0, 14.75], [-17.530330085889887, 14.969669914110089], [-17.67677669529661, 15.323223304703363], [-17.75, 15.353553390593278], [-17.82322330470339, 15.323223304703363], [-17.853553390593277, 15.25], [-17.75, 15.0], [-17.957106781186553, 14.5], [-17.75, 14.0], [-17.969669914110113, 13.469669914110089], [-18.5, 13.25], [-18.75, 13.353553390593278], [-18.82322330470339, 13.323223304703363], [-18.969669914110113, 12.969669914110089], [-19.5, 12.75], [-20.030330085889887, 12.969669914110089], [-20.17677669529661, 13.323223304703363], [-20.530330085889887, 13.469669914110089], [-20.67677669529661, 13.823223304703363], [-21.030330085889887, 13.969669914110089], [-21.25, 14.5], [-21.146446609406723, 14.75]]]}, "2021-07-25T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[-21.146446609406723, 14.75], [-21.25, 15.0], [-21.146446609406723, 15.25], [-21.25, 15.5], [-21.146446609406723, 15.75], [-21.25, 16.0], [-21.146446609406723, 16.25], [-21.25, 16.5], [-21.030330085889887, 17.03033008588991], [-20.67677669529661, 17.17677669529664], [-20.530330085889887, 17.53033008588991], [-20.0, 17.75], [-19.469669914110113, 17.53033008588991], [-19.32322330470339, 17.17677669529664], [-19.25, 17.146446609406723], [-19.0, 17.25], [-18.469669914110113, 17.03033008588991], [-18.25, 16.5], [-18.353553390593277, 16.25], [-18.25, 16.0], [-18.353553390593277, 15.75], [-18.25, 15.5], [-18.353553390593277, 15.25], [-18.25, 15.0], [-18.353553390593277, 14.75], [-18.32322330470339, 14.676776695296637], [-17.969669914110113, 14.530330085889911], [-17.75, 14.0], [-17.969669914110113, 13.469669914110089], [-18.5, 13.25], [-18.75, 13.353553390593278], [-18.82322330470339, 13.323223304703363], [-18.969669914110113, 12.969669914110089], [-19.5, 12.75], [-20.030330085889887, 12.969669914110089], [-20.17677669529661, 13.323223304703363], [-20.530330085889887, 13.469669914110089], [-20.67677669529661, 13.823223304703363], [-21.030330085889887, 13.969669914110089], [-21.25, 14.5], [-21.146446609406723, 14.75]]]}, "2021-07-26T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[-20.646446609406723, 15.75], [-20.75, 16.0], [-20.646446609406723, 16.25], [-20.75, 16.5], [-20.530330085889887, 17.03033008588991], [-20.0, 17.25], [-19.75, 17.146446609406723], [-19.5, 17.25], [-19.25, 17.146446609406723], [-19.0, 17.25], [-18.469669914110113, 17.03033008588991], [-18.25, 16.5], [-18.353553390593277, 16.25], [-18.25, 16.0], [-18.353553390593277, 15.75], [-18.25, 15.5], [-18.457106781186553, 15.0], [-18.25, 14.5], [-18.469669914110113, 13.969669914110089], [-19.0, 13.75], [-19.25, 13.853553390593278], [-19.5, 13.75], [-20.030330085889887, 13.969669914110089], [-20.25, 14.5], [-20.146446609406723, 14.75], [-20.17677669529661, 14.823223304703363], [-20.530330085889887, 14.969669914110089], [-20.75, 15.5], [-20.646446609406723, 15.75]]]}, "2021-07-27T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[-20.646446609406723, 15.25], [-20.75, 15.5], [-20.646446609406723, 15.75], [-20.75, 16.0], [-20.530330085889887, 16.53033008588991], [-20.0, 16.75], [-19.75, 16.646446609406723], [-19.67677669529661, 16.67677669529664], [-19.530330085889887, 17.03033008588991], [-19.0, 17.25], [-18.469669914110113, 17.03033008588991], [-18.25, 16.5], [-18.353553390593277, 16.25], [-18.25, 16.0], [-18.353553390593277, 15.75], [-18.25, 15.5], [-18.457106781186553, 15.0], [-18.25, 14.5], [-18.469669914110113, 13.969669914110089], [-19.0, 13.75], [-19.25, 13.853553390593278], [-19.5, 13.75], [-20.030330085889887, 13.969669914110089], [-20.17677669529661, 14.323223304703363], [-20.530330085889887, 14.469669914110089], [-20.75, 15.0], [-20.646446609406723, 15.25]]]}, "2021-07-28T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[-20.646446609406723, 15.25], [-20.75, 15.5], [-20.646446609406723, 15.75], [-20.75, 16.0], [-20.530330085889887, 16.53033008588991], [-20.0, 16.75], [-19.75, 16.646446609406723], [-19.5, 16.75], [-18.969669914110113, 16.53033008588991], [-18.75, 16.0], [-18.853553390593277, 15.75], [-18.75, 15.5], [-18.853553390593277, 15.25], [-18.82322330470339, 15.176776695296637], [-18.469669914110113, 15.030330085889911], [-18.25, 14.5], [-18.469669914110113, 13.969669914110089], [-19.0, 13.75], [-19.25, 13.853553390593278], [-19.5, 13.75], [-20.030330085889887, 13.969669914110089], [-20.17677669529661, 14.323223304703363], [-20.530330085889887, 14.469669914110089], [-20.75, 15.0], [-20.646446609406723, 15.25]]]}, "2021-07-29T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[-20.646446609406723, 15.25], [-20.75, 15.5], [-20.646446609406723, 15.75], [-20.75, 16.0], [-20.530330085889887, 16.53033008588991], [-20.0, 16.75], [-19.469669914110113, 16.53033008588991], [-19.32322330470339, 16.17677669529664], [-18.969669914110113, 16.03033008588991], [-18.75, 15.5], [-18.853553390593277, 15.25], [-18.75, 15.0], [-18.853553390593277, 14.75], [-18.75, 14.5], [-18.969669914110113, 13.969669914110089], [-19.5, 13.75], [-20.030330085889887, 13.969669914110089], [-20.17677669529661, 14.323223304703363], [-20.530330085889887, 14.469669914110089], [-20.75, 15.0], [-20.646446609406723, 15.25]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -6.890767984726779}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -1.7060387029865458}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [23.711802899526276, 23.396389678078663, 23.82739609011594, 24.20939140163017, 24.208439754553694, 24.32357969546149, 24.533687621782803, 24.679370964068198]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [20.743748461873622, 20.72518120891806, 20.420402589443256, 23.054844436737483, 23.405595250211434, 23.838560886815856, 23.892884290659538, 24.109691427790665]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-1.7057363119750946, -2.117476948954837, -1.7314491619031678, -1.2722174813194682, -1.2206611964268699, -1.3077181768294652, -1.1989047171723968, -1.0877970672621018]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.890767984726779, -6.099549707498454, -3.2923445568358147, -1.577941310653614, -1.4397453754471599, -1.528642294357553, -1.2906855305254794, -1.1679819973135181]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.748836509943885, -2.4139171176648095, -2.08294514563439, -1.757769162455542, -1.5629194743029977, -1.6920516990581527, -1.6000659494889793, -1.411431484546955]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.9029074070623575, -3.804220677577125, -3.7947590105094955, -2.296433351954568, -1.778039450962302, -1.9451863899443893, -1.8727855835106548, -1.5005747843672275]}}