{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 16:58:26.170701", "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": "2024-Apr-28_to_2024-May-04_21.5_-12.0"}, "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": 2024040000633}, "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 28 2024"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 04 2024"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 7}, "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": 156515.40500886933}, "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": ["Angola", "Zambia"]}, "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": []}, "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": -12.0}, "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": 21.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "21.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 20.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 25.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -16.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -11.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[23.82, -11.82], [23.97, -11.47], [24.32, -11.32], [24.47, -10.97], [25.0, -10.75], [25.53, -10.97], [25.75, -11.5], [25.53, -12.03], [25.18, -12.18], [25.15, -12.25], [25.25, -12.5], [25.15, -12.75], [25.25, -13.0], [25.15, -13.25], [25.25, -13.5], [25.03, -14.03], [24.68, -14.18], [24.65, -14.25], [24.75, -14.5], [24.65, -14.75], [24.75, -15.0], [24.53, -15.53], [24.18, -15.68], [24.15, -15.75], [24.25, -16.0], [24.03, -16.53], [23.5, -16.75], [22.97, -16.53], [22.75, -16.0], [22.85, -15.75], [22.82, -15.68], [22.47, -15.53], [22.25, -15.0], [22.35, -14.75], [22.25, -14.5], [22.35, -14.25], [22.32, -14.18], [22.25, -14.15], [22.0, -14.25], [21.5, -14.04], [21.18, -14.18], [21.03, -14.53], [20.5, -14.75], [20.25, -14.65], [20.0, -14.75], [19.47, -14.53], [19.25, -14.0], [19.35, -13.75], [19.25, -13.5], [19.35, -13.25], [19.25, -13.0], [19.46, -12.5], [19.25, -12.0], [19.47, -11.47], [20.0, -11.25], [20.25, -11.35], [20.32, -11.32], [20.47, -10.97], [21.0, -10.75], [21.25, -10.85], [21.5, -10.75], [21.75, -10.85], [22.0, -10.75], [22.25, -10.85], [22.5, -10.75], [23.03, -10.97], [23.25, -11.5], [23.15, -11.75], [23.18, -11.82], [23.25, -11.85], [23.5, -11.75], [23.75, -11.85], [23.82, -11.82]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.Southern-Africa", "E.Southern-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2024-04-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[21.75, -12.5], [21.97, -11.97], [22.5, -11.75], [23.0, -11.96], [23.5, -11.75], [24.03, -11.97], [24.18, -12.32], [24.25, -12.35], [24.5, -12.25], [25.03, -12.47], [25.25, -13.0], [25.15, -13.25], [25.25, -13.5], [25.03, -14.03], [24.68, -14.18], [24.65, -14.25], [24.75, -14.5], [24.65, -14.75], [24.75, -15.0], [24.53, -15.53], [24.18, -15.68], [24.15, -15.75], [24.25, -16.0], [24.03, -16.53], [23.5, -16.75], [22.97, -16.53], [22.75, -16.0], [22.85, -15.75], [22.82, -15.68], [22.47, -15.53], [22.25, -15.0], [22.46, -14.5], [22.25, -14.0], [22.46, -13.5], [22.32, -13.18], [21.97, -13.03], [21.75, -12.5]]], [[[19.47, -12.97], [19.82, -12.82], [19.97, -12.47], [20.5, -12.25], [20.75, -12.35], [21.0, -12.25], [21.53, -12.47], [21.75, -13.0], [21.65, -13.25], [21.75, -13.5], [21.53, -14.03], [21.18, -14.18], [21.03, -14.53], [20.5, -14.75], [20.25, -14.65], [20.0, -14.75], [19.47, -14.53], [19.25, -14.0], [19.35, -13.75], [19.25, -13.5], [19.47, -12.97]]]]}, "2024-04-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[19.25, -13.5], [19.35, -13.25], [19.25, -13.0], [19.46, -12.5], [19.25, -12.0], [19.47, -11.47], [20.0, -11.25], [20.25, -11.35], [20.32, -11.32], [20.47, -10.97], [21.0, -10.75], [21.25, -10.85], [21.5, -10.75], [21.75, -10.85], [22.0, -10.75], [22.53, -10.97], [22.68, -11.32], [23.03, -11.47], [23.2, -11.87], [23.5, -11.75], [24.03, -11.97], [24.18, -12.32], [24.25, -12.35], [24.5, -12.25], [25.03, -12.47], [25.25, -13.0], [25.15, -13.25], [25.25, -13.5], [25.03, -14.03], [24.68, -14.18], [24.65, -14.25], [24.75, -14.5], [24.65, -14.75], [24.75, -15.0], [24.53, -15.53], [24.18, -15.68], [24.15, -15.75], [24.25, -16.0], [24.03, -16.53], [23.5, -16.75], [22.97, -16.53], [22.75, -16.0], [22.85, -15.75], [22.82, -15.68], [22.47, -15.53], [22.25, -15.0], [22.35, -14.75], [22.25, -14.5], [22.35, -14.25], [22.3, -14.12], [22.0, -14.25], [21.5, -14.04], [21.18, -14.18], [21.03, -14.53], [20.5, -14.75], [20.25, -14.65], [20.0, -14.75], [19.47, -14.53], [19.25, -14.0], [19.35, -13.75], [19.25, -13.5]]]]}, "2024-04-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[19.25, -13.5], [19.35, -13.25], [19.25, -13.0], [19.46, -12.5], [19.25, -12.0], [19.47, -11.47], [20.0, -11.25], [20.25, -11.35], [20.32, -11.32], [20.47, -10.97], [21.0, -10.75], [21.25, -10.85], [21.5, -10.75], [21.75, -10.85], [22.0, -10.75], [22.53, -10.97], [22.68, -11.32], [23.03, -11.47], [23.18, -11.82], [23.25, -11.85], [23.5, -11.75], [23.75, -11.85], [23.82, -11.82], [23.97, -11.47], [24.32, -11.32], [24.47, -10.97], [25.0, -10.75], [25.53, -10.97], [25.75, -11.5], [25.53, -12.03], [25.18, -12.18], [25.15, -12.25], [25.25, -12.5], [25.15, -12.75], [25.25, -13.0], [25.15, -13.25], [25.25, -13.5], [25.03, -14.03], [24.68, -14.18], [24.65, -14.25], [24.75, -14.5], [24.65, -14.75], [24.75, -15.0], [24.53, -15.53], [24.18, -15.68], [24.15, -15.75], [24.25, -16.0], [24.03, -16.53], [23.5, -16.75], [22.97, -16.53], [22.75, -16.0], [22.85, -15.75], [22.82, -15.68], [22.47, -15.53], [22.25, -15.0], [22.35, -14.75], [22.25, -14.5], [22.35, -14.25], [22.32, -14.18], [22.25, -14.15], [22.0, -14.25], [21.5, -14.04], [21.18, -14.18], [21.03, -14.53], [20.5, -14.75], [20.25, -14.65], [20.0, -14.75], [19.47, -14.53], [19.25, -14.0], [19.35, -13.75], [19.25, -13.5]]]]}, "2024-05-01T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[19.25, -12.0], [19.47, -11.47], [20.0, -11.25], [20.25, -11.35], [20.32, -11.32], [20.47, -10.97], [21.0, -10.75], [21.25, -10.85], [21.5, -10.75], [21.75, -10.85], [22.0, -10.75], [22.25, -10.85], [22.5, -10.75], [23.03, -10.97], [23.25, -11.5], [23.15, -11.75], [23.18, -11.82], [23.25, -11.85], [23.5, -11.75], [23.75, -11.85], [23.82, -11.82], [23.97, -11.47], [24.32, -11.32], [24.47, -10.97], [25.0, -10.75], [25.53, -10.97], [25.75, -11.5], [25.53, -12.03], [25.18, -12.18], [25.15, -12.25], [25.25, -12.5], [25.15, -12.75], [25.25, -13.0], [25.15, -13.25], [25.25, -13.5], [25.03, -14.03], [24.68, -14.18], [24.65, -14.25], [24.75, -14.5], [24.65, -14.75], [24.75, -15.0], [24.53, -15.53], [24.18, -15.68], [24.03, -16.03], [23.5, -16.25], [22.97, -16.03], [22.82, -15.68], [22.47, -15.53], [22.25, -15.0], [22.35, -14.75], [22.25, -14.5], [22.35, -14.25], [22.32, -14.18], [22.25, -14.15], [22.0, -14.25], [21.5, -14.04], [21.0, -14.25], [20.75, -14.15], [20.5, -14.25], [19.97, -14.03], [19.82, -13.68], [19.47, -13.53], [19.25, -13.0], [19.46, -12.5], [19.25, -12.0]]]]}, "2024-05-02T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[19.25, -12.0], [19.47, -11.47], [20.0, -11.25], [20.25, -11.35], [20.32, -11.32], [20.47, -10.97], [21.0, -10.75], [21.25, -10.85], [21.5, -10.75], [21.75, -10.85], [22.0, -10.75], [22.25, -10.85], [22.5, -10.75], [23.03, -10.97], [23.25, -11.5], [23.15, -11.75], [23.18, -11.82], [23.25, -11.85], [23.5, -11.75], [23.75, -11.85], [23.82, -11.82], [23.97, -11.47], [24.32, -11.32], [24.47, -10.97], [25.0, -10.75], [25.53, -10.97], [25.75, -11.5], [25.53, -12.03], [25.18, -12.18], [25.15, -12.25], [25.25, -12.5], [25.15, -12.75], [25.25, -13.0], [25.15, -13.25], [25.25, -13.5], [25.03, -14.03], [24.68, -14.18], [24.53, -14.53], [24.18, -14.68], [24.15, -14.75], [24.25, -15.0], [24.03, -15.53], [23.5, -15.75], [22.97, -15.53], [22.82, -15.18], [22.47, -15.03], [22.25, -14.5], [22.35, -14.25], [22.32, -14.18], [22.25, -14.15], [22.0, -14.25], [21.5, -14.04], [21.0, -14.25], [20.75, -14.15], [20.5, -14.25], [19.97, -14.03], [19.82, -13.68], [19.47, -13.53], [19.25, -13.0], [19.46, -12.5], [19.25, -12.0]]]]}, "2024-05-03T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[20.75, -11.5], [20.97, -10.97], [21.5, -10.75], [21.75, -10.85], [22.0, -10.75], [22.25, -10.85], [22.5, -10.75], [23.03, -10.97], [23.25, -11.5], [23.03, -12.03], [22.68, -12.18], [22.53, -12.53], [22.0, -12.75], [21.75, -12.65], [21.5, -12.75], [20.97, -12.53], [20.75, -12.0], [20.85, -11.75], [20.75, -11.5]]]]}, "2024-05-04T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[21.5, -12.75], [20.97, -12.53], [20.75, -12.0], [20.97, -11.47], [21.5, -11.25], [21.75, -11.35], [22.0, -11.25], [22.53, -11.47], [22.75, -12.0], [22.53, -12.53], [22.0, -12.75], [21.75, -12.65], [21.5, -12.75]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -2.702697875580725}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -1.9036712046728017}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [19.993659857259445, 20.18468745887094, 19.885693027107777, 19.98078134044107, 19.85171359855326, 21.102463731074124, 21.113478635215472]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [18.795931425710705, 18.627798666022784, 18.62906401134495, 18.31628119691476, 18.460594973924287, 20.950350080466308, 21.071618776389982]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-1.871155192906192, -1.7513581219530787, -1.9313048510725097, -1.907737845991014, -2.047571875524309, -1.8284030718847588, -1.9530577054223954]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-2.4260608346762638, -2.0212939891930546, -2.304488333529889, -2.353368257425757, -2.702697875580725, -2.0088987473923794, -1.9713458285357888]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.6441454168861327, -1.5495084389311293, -1.6858669196956808, -1.643603074502314, -1.7198621602136492, -1.4579867651338454, -1.528566849284607]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.055557125415666, -1.8598057488557032, -2.0158135482878374, -2.0461388443159443, -2.1297320101527113, -1.5733794840951325, -1.557529327161867]}}