{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-03-19 18:12:45.269171", "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": "2020-Apr-21_to_2020-Apr-26_20.0_-16.5"}, "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": 2020040000590}, "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 21 2020"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "April 26 2020"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 6}, "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": 275198.7960368745}, "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", "Botswana", "Namibia", "Zambia"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Africa", "Africa", "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": -16.5}, "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": 20.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "20.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 17.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 23.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -19.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -14.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "Polygon", "coordinates": [[[16.823, -15.823], [16.97, -15.47], [17.5, -15.25], [17.75, -15.354], [17.823, -15.323], [17.97, -14.97], [18.323, -14.823], [18.47, -14.47], [18.823, -14.323], [18.97, -13.97], [19.5, -13.75], [19.75, -13.854], [20.0, -13.75], [20.53, -13.97], [20.677, -14.323], [20.927, -14.427], [20.75, -14.0], [20.97, -13.47], [21.5, -13.25], [21.75, -13.354], [22.0, -13.25], [22.53, -13.47], [22.677, -13.823], [23.03, -13.97], [23.25, -14.5], [23.146, -14.75], [23.25, -15.0], [23.125, -15.302], [23.25, -15.354], [23.5, -15.25], [24.03, -15.47], [24.25, -16.0], [24.146, -16.25], [24.25, -16.5], [24.146, -16.75], [24.25, -17.0], [24.146, -17.25], [24.25, -17.5], [24.146, -17.75], [24.25, -18.0], [24.03, -18.53], [23.5, -18.75], [23.0, -18.543], [22.677, -18.677], [22.53, -19.03], [22.0, -19.25], [21.75, -19.146], [21.5, -19.25], [21.0, -19.043], [20.677, -19.177], [20.53, -19.53], [20.177, -19.677], [20.03, -20.03], [19.5, -20.25], [18.97, -20.03], [18.823, -19.677], [18.47, -19.53], [18.323, -19.177], [17.97, -19.03], [17.75, -18.5], [17.854, -18.251], [17.854, -18.25], [17.823, -18.177], [17.75, -18.146], [17.5, -18.25], [16.97, -18.03], [16.75, -17.5], [16.854, -17.25], [16.823, -17.177], [16.47, -17.03], [16.25, -16.5], [16.47, -15.97], [16.823, -15.823]], [[21.177, -14.823], [21.25, -14.854], [21.251, -14.854], [21.375, -14.802], [21.323, -14.677], [21.073, -14.573], [21.177, -14.823]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.Southern-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2020-04-21T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[16.853553390593273, -17.25], [16.75, -17.0], [16.853553390593273, -16.75], [16.75, -16.5], [16.96966991411009, -15.969669914110089], [17.5, -15.75], [17.75, -15.853553390593273], [18.0, -15.75], [18.25, -15.853553390593273], [18.32322330470336, -15.823223304703363], [18.46966991411009, -15.469669914110089], [19.0, -15.25], [19.25, -15.353553390593273], [19.32322330470336, -15.323223304703363], [19.46966991411009, -14.969669914110089], [20.0, -14.75], [20.53033008588991, -14.969669914110089], [20.67677669529664, -15.323223304703363], [20.75, -15.353553390593273], [20.82322330470336, -15.323223304703363], [20.96966991411009, -14.969669914110089], [21.375, -14.801776695296637], [21.25, -14.5], [21.353553390593273, -14.25], [21.25, -14.0], [21.46966991411009, -13.469669914110089], [22.0, -13.25], [22.53033008588991, -13.469669914110089], [22.67677669529664, -13.823223304703363], [23.03033008588991, -13.969669914110089], [23.25, -14.5], [23.146446609406727, -14.75], [23.25, -15.0], [23.125, -15.301776695296637], [23.25, -15.353553390593273], [23.5, -15.25], [24.03033008588991, -15.469669914110089], [24.25, -16.0], [24.146446609406727, -16.25], [24.25, -16.5], [24.146446609406727, -16.75], [24.25, -17.0], [24.146446609406727, -17.25], [24.25, -17.5], [24.146446609406727, -17.75], [24.25, -18.0], [24.03033008588991, -18.53033008588991], [23.5, -18.75], [23.0, -18.542893218813454], [22.67677669529664, -18.67677669529664], [22.53033008588991, -19.03033008588991], [22.0, -19.25], [21.75, -19.146446609406727], [21.5, -19.25], [21.0, -19.042893218813454], [20.67677669529664, -19.17677669529664], [20.53033008588991, -19.53033008588991], [20.17677669529664, -19.67677669529664], [20.03033008588991, -20.03033008588991], [19.5, -20.25], [18.96966991411009, -20.03033008588991], [18.82322330470336, -19.67677669529664], [18.46966991411009, -19.53033008588991], [18.32322330470336, -19.17677669529664], [17.96966991411009, -19.03033008588991], [17.75, -18.5], [17.853553390593273, -18.25], [17.82322330470336, -18.17677669529664], [17.75, -18.146446609406727], [17.5, -18.25], [16.96966991411009, -18.03033008588991], [16.75, -17.5], [16.853553390593273, -17.25]]]}, "2020-04-22T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[16.82322330470336, -17.17677669529664], [16.46966991411009, -17.03033008588991], [16.25, -16.5], [16.46966991411009, -15.969669914110089], [16.82322330470336, -15.823223304703363], [16.96966991411009, -15.469669914110089], [17.5, -15.25], [17.75, -15.353553390593273], [17.82322330470336, -15.323223304703363], [17.96966991411009, -14.969669914110089], [18.32322330470336, -14.823223304703363], [18.46966991411009, -14.469669914110089], [18.82322330470336, -14.323223304703363], [18.96966991411009, -13.969669914110089], [19.5, -13.75], [19.75, -13.853553390593273], [20.0, -13.75], [20.53033008588991, -13.969669914110089], [20.67677669529664, -14.323223304703363], [20.926776695296635, -14.426776695296635], [20.75, -14.0], [20.96966991411009, -13.469669914110089], [21.5, -13.25], [21.75, -13.353553390593273], [22.0, -13.25], [22.53033008588991, -13.469669914110089], [22.67677669529664, -13.823223304703363], [23.03033008588991, -13.969669914110089], [23.25, -14.5], [23.146446609406727, -14.75], [23.25, -15.0], [23.125, -15.301776695296637], [23.25, -15.353553390593273], [23.5, -15.25], [24.03033008588991, -15.469669914110089], [24.25, -16.0], [24.146446609406727, -16.25], [24.25, -16.5], [24.146446609406727, -16.75], [24.25, -17.0], [24.146446609406727, -17.25], [24.25, -17.5], [24.146446609406727, -17.75], [24.25, -18.0], [24.03033008588991, -18.53033008588991], [23.5, -18.75], [23.0, -18.542893218813454], [22.67677669529664, -18.67677669529664], [22.53033008588991, -19.03033008588991], [22.0, -19.25], [21.75, -19.146446609406727], [21.5, -19.25], [21.0, -19.042893218813454], [20.67677669529664, -19.17677669529664], [20.53033008588991, -19.53033008588991], [20.17677669529664, -19.67677669529664], [20.03033008588991, -20.03033008588991], [19.5, -20.25], [18.96966991411009, -20.03033008588991], [18.82322330470336, -19.67677669529664], [18.46966991411009, -19.53033008588991], [18.32322330470336, -19.17677669529664], [17.96966991411009, -19.03033008588991], [17.75, -18.5], [17.853553390593273, -18.25], [17.82322330470336, -18.17677669529664], [17.75, -18.146446609406727], [17.5, -18.25], [16.96966991411009, -18.03033008588991], [16.75, -17.5], [16.853553390593273, -17.25], [16.82322330470336, -17.17677669529664]], [[21.25, -14.853553390593273], [21.375, -14.801776695296637], [21.32322330470336, -14.676776695296637], [21.073223304703365, -14.573223304703365], [21.17677669529664, -14.823223304703363], [21.25, -14.853553390593273]]]}, "2020-04-23T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[16.82322330470336, -17.17677669529664], [16.46966991411009, -17.03033008588991], [16.25, -16.5], [16.46966991411009, -15.969669914110089], [16.82322330470336, -15.823223304703363], [16.96966991411009, -15.469669914110089], [17.5, -15.25], [17.75, -15.353553390593273], [17.82322330470336, -15.323223304703363], [17.96966991411009, -14.969669914110089], [18.32322330470336, -14.823223304703363], [18.46966991411009, -14.469669914110089], [18.82322330470336, -14.323223304703363], [18.96966991411009, -13.969669914110089], [19.5, -13.75], [19.75, -13.853553390593273], [20.0, -13.75], [20.53033008588991, -13.969669914110089], [20.67677669529664, -14.323223304703363], [20.926776695296635, -14.426776695296635], [20.75, -14.0], [20.96966991411009, -13.469669914110089], [21.5, -13.25], [21.75, -13.353553390593273], [22.0, -13.25], [22.53033008588991, -13.469669914110089], [22.67677669529664, -13.823223304703363], [23.03033008588991, -13.969669914110089], [23.25, -14.5], [23.146446609406727, -14.75], [23.25, -15.0], [23.125, -15.301776695296637], [23.25, -15.353553390593273], [23.5, -15.25], [24.03033008588991, -15.469669914110089], [24.25, -16.0], [24.146446609406727, -16.25], [24.25, -16.5], [24.146446609406727, -16.75], [24.25, -17.0], [24.146446609406727, -17.25], [24.25, -17.5], [24.146446609406727, -17.75], [24.25, -18.0], [24.03033008588991, -18.53033008588991], [23.5, -18.75], [23.0, -18.542893218813454], [22.67677669529664, -18.67677669529664], [22.53033008588991, -19.03033008588991], [22.0, -19.25], [21.75, -19.146446609406727], [21.5, -19.25], [21.0, -19.042893218813454], [20.67677669529664, -19.17677669529664], [20.53033008588991, -19.53033008588991], [20.17677669529664, -19.67677669529664], [20.03033008588991, -20.03033008588991], [19.5, -20.25], [18.96966991411009, -20.03033008588991], [18.82322330470336, -19.67677669529664], [18.46966991411009, -19.53033008588991], [18.32322330470336, -19.17677669529664], [17.96966991411009, -19.03033008588991], [17.75, -18.5], [17.853553390593273, -18.25], [17.82322330470336, -18.17677669529664], [17.75, -18.146446609406727], [17.5, -18.25], [16.96966991411009, -18.03033008588991], [16.75, -17.5], [16.853553390593273, -17.25], [16.82322330470336, -17.17677669529664]], [[21.25, -14.853553390593273], [21.375, -14.801776695296637], [21.32322330470336, -14.676776695296637], [21.073223304703365, -14.573223304703365], [21.17677669529664, -14.823223304703363], [21.25, -14.853553390593273]]]}, "2020-04-24T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[16.82322330470336, -17.17677669529664], [16.46966991411009, -17.03033008588991], [16.25, -16.5], [16.46966991411009, -15.969669914110089], [16.82322330470336, -15.823223304703363], [16.96966991411009, -15.469669914110089], [17.5, -15.25], [17.75, -15.353553390593273], [17.82322330470336, -15.323223304703363], [17.96966991411009, -14.969669914110089], [18.32322330470336, -14.823223304703363], [18.46966991411009, -14.469669914110089], [18.82322330470336, -14.323223304703363], [18.96966991411009, -13.969669914110089], [19.5, -13.75], [19.75, -13.853553390593273], [20.0, -13.75], [20.53033008588991, -13.969669914110089], [20.67677669529664, -14.323223304703363], [20.926776695296635, -14.426776695296635], [20.75, -14.0], [20.96966991411009, -13.469669914110089], [21.5, -13.25], [22.03033008588991, -13.469669914110089], [22.25, -14.0], [22.03033008588991, -14.530330085889911], [21.5, -14.75], [21.073223304703365, -14.573223304703365], [21.17677669529664, -14.823223304703363], [21.53033008588991, -14.969669914110089], [21.75, -15.5], [21.646446609406727, -15.75], [21.67677669529664, -15.823223304703363], [22.03033008588991, -15.969669914110089], [22.25, -16.5], [22.03033008588991, -17.03033008588991], [21.67677669529664, -17.17677669529664], [21.646446609406727, -17.25], [21.75, -17.5], [21.646446609406727, -17.75], [21.67677669529664, -17.82322330470336], [22.03033008588991, -17.96966991411009], [22.25, -18.5], [22.03033008588991, -19.03033008588991], [21.5, -19.25], [21.0, -19.042893218813454], [20.67677669529664, -19.17677669529664], [20.53033008588991, -19.53033008588991], [20.0, -19.75], [19.75, -19.646446609406727], [19.5, -19.75], [19.25, -19.646446609406727], [19.0, -19.75], [18.46966991411009, -19.53033008588991], [18.25, -19.0], [18.353553390593273, -18.75], [18.32322330470336, -18.67677669529664], [17.96966991411009, -18.53033008588991], [17.82322330470336, -18.17677669529664], [17.75, -18.146446609406727], [17.5, -18.25], [16.96966991411009, -18.03033008588991], [16.75, -17.5], [16.853553390593273, -17.25], [16.82322330470336, -17.17677669529664]]]}, "2020-04-25T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[18.32322330470336, -15.823223304703363], [18.46966991411009, -15.469669914110089], [19.0, -15.25], [19.25, -15.353553390593273], [19.32322330470336, -15.323223304703363], [19.46966991411009, -14.969669914110089], [20.0, -14.75], [20.53033008588991, -14.969669914110089], [20.75, -15.5], [20.646446609406727, -15.75], [20.67677669529664, -15.823223304703363], [21.03033008588991, -15.969669914110089], [21.25, -16.5], [21.03033008588991, -17.03033008588991], [20.5, -17.25], [20.25, -17.146446609406727], [20.17677669529664, -17.17677669529664], [20.03033008588991, -17.53033008588991], [19.5, -17.75], [18.96966991411009, -17.53033008588991], [18.80177669529664, -17.125], [18.5, -17.25], [17.96966991411009, -17.03033008588991], [17.75, -16.5], [17.96966991411009, -15.969669914110089], [18.32322330470336, -15.823223304703363]]]}, "2020-04-26T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[18.853553390593273, -16.75], [18.75, -16.5], [18.96966991411009, -15.969669914110089], [19.5, -15.75], [19.75, -15.853553390593273], [20.0, -15.75], [20.53033008588991, -15.969669914110089], [20.75, -16.5], [20.53033008588991, -17.03033008588991], [20.17677669529664, -17.17677669529664], [20.03033008588991, -17.53033008588991], [19.5, -17.75], [18.96966991411009, -17.53033008588991], [18.75, -17.0], [18.853553390593273, -16.75]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -3.9501742149239476}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.577604300735088}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [20.227052245960977, 19.778817681414694, 19.75589272209527, 19.87505483550848, 20.10255192851247, 20.04336099944004]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [18.977363144087462, 18.64435677954998, 18.355195232769802, 18.8866127883104, 19.7757520245068, 19.827325160926478]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.4797768440526076, -2.763336961270698, -2.7269760817054505, -2.3419163569747714, -1.7892761465400515, -1.85757732127873]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.302957568713225, -3.7647906720167725, -3.9501742149239476, -3.3181141917035575, -2.093007199952069, -1.944212225623005]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.7740708847831654, -1.972781837217051, -1.8823715146106368, -1.5562176528814367, -1.2936458018901387, -1.2434325048844797]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.673388364495629, -2.7443122401835116, -2.296339078697768, -1.9709438993374992, -1.4250730857109168, -1.3146221841404018]}}