{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:06:57.239883", "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": "2025-Aug-17_to_2025-Aug-21_45.5_-22.5"}, "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": 2025080000611}, "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": "August 17 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "August 21 2025"}, "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": 76783.89685430544}, "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": ["Madagascar"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["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": ["Indian 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": -22.5}, "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": 45.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "45.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 45.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 47.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -24.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -21.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[44.82, -23.68], [44.47, -23.53], [44.25, -23.0], [44.35, -22.75], [44.25, -22.5], [44.47, -21.97], [44.82, -21.82], [44.97, -21.47], [45.32, -21.32], [45.35, -21.25], [45.25, -21.0], [45.47, -20.47], [46.0, -20.25], [46.53, -20.47], [46.75, -21.0], [46.65, -21.25], [46.75, -21.5], [46.65, -21.75], [46.68, -21.82], [46.75, -21.85], [47.0, -21.75], [47.25, -21.85], [47.5, -21.75], [48.03, -21.97], [48.25, -22.5], [48.15, -22.75], [48.25, -23.0], [48.15, -23.25], [48.25, -23.5], [48.15, -23.75], [48.25, -24.0], [48.03, -24.53], [47.68, -24.68], [47.53, -25.03], [47.0, -25.25], [46.75, -25.15], [46.5, -25.25], [46.25, -25.15], [46.0, -25.25], [45.47, -25.03], [45.25, -24.5], [45.35, -24.25], [45.32, -24.18], [44.97, -24.03], [44.82, -23.68]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Madagascar"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-08-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[44.97, -23.03], [44.75, -22.5], [44.97, -21.97], [45.32, -21.82], [45.47, -21.47], [46.0, -21.25], [46.53, -21.47], [46.68, -21.82], [46.75, -21.85], [47.0, -21.75], [47.53, -21.97], [47.75, -22.5], [47.65, -22.75], [47.75, -23.0], [47.65, -23.25], [47.75, -23.5], [47.65, -23.75], [47.75, -24.0], [47.65, -24.25], [47.75, -24.5], [47.53, -25.03], [47.0, -25.25], [46.75, -25.15], [46.5, -25.25], [46.25, -25.15], [46.0, -25.25], [45.47, -25.03], [45.25, -24.5], [45.35, -24.25], [45.25, -24.0], [45.35, -23.75], [45.25, -23.5], [45.35, -23.25], [45.32, -23.18], [44.97, -23.03]]]]}, "2025-08-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[44.25, -22.5], [44.47, -21.97], [44.82, -21.82], [44.97, -21.47], [45.32, -21.32], [45.35, -21.25], [45.25, -21.0], [45.47, -20.47], [46.0, -20.25], [46.53, -20.47], [46.75, -21.0], [46.65, -21.25], [46.75, -21.5], [46.65, -21.75], [46.68, -21.82], [46.75, -21.85], [47.0, -21.75], [47.25, -21.85], [47.5, -21.75], [48.03, -21.97], [48.25, -22.5], [48.15, -22.75], [48.25, -23.0], [48.15, -23.25], [48.25, -23.5], [48.15, -23.75], [48.25, -24.0], [48.03, -24.53], [47.68, -24.68], [47.53, -25.03], [47.0, -25.25], [46.75, -25.15], [46.5, -25.25], [46.25, -25.15], [46.0, -25.25], [45.47, -25.03], [45.25, -24.5], [45.35, -24.25], [45.32, -24.18], [44.97, -24.03], [44.82, -23.68], [44.47, -23.53], [44.25, -23.0], [44.35, -22.75], [44.25, -22.5]]]]}, "2025-08-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[44.25, -22.5], [44.47, -21.97], [44.82, -21.82], [44.97, -21.47], [45.32, -21.32], [45.35, -21.25], [45.25, -21.0], [45.47, -20.47], [46.0, -20.25], [46.53, -20.47], [46.75, -21.0], [46.65, -21.25], [46.75, -21.5], [46.65, -21.75], [46.68, -21.82], [46.75, -21.85], [47.0, -21.75], [47.25, -21.85], [47.5, -21.75], [48.03, -21.97], [48.25, -22.5], [48.15, -22.75], [48.25, -23.0], [48.15, -23.25], [48.25, -23.5], [48.15, -23.75], [48.25, -24.0], [48.03, -24.53], [47.68, -24.68], [47.53, -25.03], [47.0, -25.25], [46.75, -25.15], [46.5, -25.25], [46.25, -25.15], [46.0, -25.25], [45.47, -25.03], [45.25, -24.5], [45.35, -24.25], [45.32, -24.18], [44.97, -24.03], [44.82, -23.68], [44.47, -23.53], [44.25, -23.0], [44.35, -22.75], [44.25, -22.5]]]]}, "2025-08-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[46.75, -23.0], [46.85, -22.75], [46.75, -22.5], [46.97, -21.97], [47.5, -21.75], [48.03, -21.97], [48.25, -22.5], [48.15, -22.75], [48.25, -23.0], [48.15, -23.25], [48.25, -23.5], [48.15, -23.75], [48.25, -24.0], [48.03, -24.53], [47.5, -24.75], [46.97, -24.53], [46.75, -24.0], [46.85, -23.75], [46.75, -23.5], [46.85, -23.25], [46.75, -23.0]]], [[[44.47, -21.97], [44.82, -21.82], [44.97, -21.47], [45.32, -21.32], [45.35, -21.25], [45.25, -21.0], [45.47, -20.47], [46.0, -20.25], [46.53, -20.47], [46.75, -21.0], [46.65, -21.25], [46.75, -21.5], [46.65, -21.75], [46.75, -22.0], [46.53, -22.53], [46.18, -22.68], [46.15, -22.75], [46.18, -22.82], [46.53, -22.97], [46.75, -23.5], [46.53, -24.03], [46.0, -24.25], [45.75, -24.15], [45.5, -24.25], [44.97, -24.03], [44.82, -23.68], [44.47, -23.53], [44.25, -23.0], [44.35, -22.75], [44.25, -22.5], [44.47, -21.97]]]]}, "2025-08-21T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[44.97, -22.97], [45.5, -22.75], [46.03, -22.97], [46.25, -23.5], [46.03, -24.03], [45.5, -24.25], [44.97, -24.03], [44.75, -23.5], [44.97, -22.97]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -4.142700242263572}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -2.629232409854961}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [14.666314697265648, 15.259725707254347, 15.971668497721396, 17.823522731236096, 18.04720840454104]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [11.769764200846396, 10.722149149576865, 11.79206237792971, 15.732097880045615, 18.04720840454104]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.541634579273669, -3.154792076910288, -2.5203901452365933, -1.9464232791178477, -2.3387556636773184]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.3075775158072815, -4.142700242263572, -3.3467860671440803, -2.4013856633160344, -2.3387556636773184]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.6518439444231698, -2.360189718836901, -1.9729773959693861, -1.6264870212910476, -1.4310130042782265]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.87415757965163, -2.8220051811491955, -2.4872067495911527, -1.8826096853249243, -1.4310130042782265]}}