{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:09:22.714383", "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-Dec-22_to_2025-Dec-25_324.5_-9.0"}, "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": 2025120000744}, "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": "December 22 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "December 25 2025"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 4}, "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": 58130.104022904925}, "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": ["Brazil"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["America"]}, "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", "Oceano Atl\u00e2ntico"]}, "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": -9.0}, "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": 324.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "324.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 323.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 325.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -9.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -7.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-34.25, -7.5], [-34.35, -7.75], [-34.25, -8.0], [-34.35, -8.25], [-34.25, -8.5], [-34.47, -9.03], [-34.82, -9.18], [-34.97, -9.53], [-35.32, -9.68], [-35.47, -10.03], [-36.0, -10.25], [-36.25, -10.15], [-36.5, -10.25], [-36.75, -10.15], [-37.0, -10.25], [-37.53, -10.03], [-37.75, -9.5], [-37.53, -8.97], [-37.0, -8.75], [-36.75, -8.85], [-36.68, -8.82], [-36.65, -8.75], [-36.68, -8.68], [-37.03, -8.53], [-37.25, -8.0], [-37.15, -7.75], [-37.25, -7.5], [-37.15, -7.25], [-37.25, -7.0], [-37.03, -6.47], [-36.5, -6.25], [-36.25, -6.35], [-36.0, -6.25], [-35.75, -6.35], [-35.5, -6.25], [-34.97, -6.47], [-34.82, -6.82], [-34.47, -6.97], [-34.25, -7.5]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.E.South-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-12-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-37.25, -7.5], [-37.14999999999998, -7.25], [-37.25, -7.0], [-37.02999999999997, -6.47], [-36.5, -6.25], [-36.25, -6.35], [-36.0, -6.25], [-35.75, -6.35], [-35.5, -6.25], [-34.97000000000003, -6.47], [-34.81999999999999, -6.82], [-34.47000000000003, -6.97], [-34.25, -7.5], [-34.35000000000002, -7.75], [-34.25, -8.0], [-34.35000000000002, -8.25], [-34.25, -8.5], [-34.47000000000003, -9.03], [-34.81999999999999, -9.18], [-34.97000000000003, -9.53], [-35.31999999999999, -9.68], [-35.47000000000003, -10.03], [-36.0, -10.25], [-36.25, -10.15], [-36.5, -10.25], [-36.75, -10.15], [-37.0, -10.25], [-37.52999999999997, -10.03], [-37.75, -9.5], [-37.52999999999997, -8.97], [-37.0, -8.75], [-36.75, -8.85], [-36.68000000000001, -8.82], [-36.64999999999998, -8.75], [-36.68000000000001, -8.68], [-37.02999999999997, -8.53], [-37.25, -8.0], [-37.14999999999998, -7.75], [-37.25, -7.5]]]]}, "2025-12-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-37.25, -7.5], [-37.14999999999998, -7.25], [-37.25, -7.0], [-37.02999999999997, -6.47], [-36.5, -6.25], [-36.25, -6.35], [-36.0, -6.25], [-35.75, -6.35], [-35.5, -6.25], [-34.97000000000003, -6.47], [-34.81999999999999, -6.82], [-34.47000000000003, -6.97], [-34.25, -7.5], [-34.35000000000002, -7.75], [-34.25, -8.0], [-34.35000000000002, -8.25], [-34.25, -8.5], [-34.47000000000003, -9.03], [-34.81999999999999, -9.18], [-34.97000000000003, -9.53], [-35.31999999999999, -9.68], [-35.47000000000003, -10.03], [-36.0, -10.25], [-36.25, -10.15], [-36.5, -10.25], [-36.75, -10.15], [-37.0, -10.25], [-37.52999999999997, -10.03], [-37.75, -9.5], [-37.52999999999997, -8.97], [-37.0, -8.75], [-36.75, -8.85], [-36.68000000000001, -8.82], [-36.64999999999998, -8.75], [-36.68000000000001, -8.68], [-37.02999999999997, -8.53], [-37.25, -8.0], [-37.14999999999998, -7.75], [-37.25, -7.5]]]]}, "2025-12-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-37.25, -7.5], [-37.14999999999998, -7.25], [-37.25, -7.0], [-37.02999999999997, -6.47], [-36.5, -6.25], [-36.25, -6.35], [-36.0, -6.25], [-35.75, -6.35], [-35.5, -6.25], [-34.97000000000003, -6.47], [-34.81999999999999, -6.82], [-34.47000000000003, -6.97], [-34.25, -7.5], [-34.35000000000002, -7.75], [-34.25, -8.0], [-34.35000000000002, -8.25], [-34.25, -8.5], [-34.47000000000003, -9.03], [-34.81999999999999, -9.18], [-34.97000000000003, -9.53], [-35.31999999999999, -9.68], [-35.47000000000003, -10.03], [-36.0, -10.25], [-36.25, -10.15], [-36.5, -10.25], [-36.75, -10.15], [-37.0, -10.25], [-37.52999999999997, -10.03], [-37.75, -9.5], [-37.52999999999997, -8.97], [-37.0, -8.75], [-36.75, -8.85], [-36.68000000000001, -8.82], [-36.64999999999998, -8.75], [-36.68000000000001, -8.68], [-37.02999999999997, -8.53], [-37.25, -8.0], [-37.14999999999998, -7.75], [-37.25, -7.5]]]]}, "2025-12-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-36.64999999999998, -8.75], [-36.75, -8.5], [-36.54000000000002, -8.0], [-36.75, -7.5], [-36.52999999999997, -6.97], [-36.0, -6.75], [-35.75, -6.85], [-35.5, -6.75], [-35.25, -6.85], [-35.0, -6.75], [-34.47000000000003, -6.97], [-34.25, -7.5], [-34.35000000000002, -7.75], [-34.25, -8.0], [-34.35000000000002, -8.25], [-34.25, -8.5], [-34.47000000000003, -9.03], [-34.81999999999999, -9.18], [-34.97000000000003, -9.53], [-35.31999999999999, -9.68], [-35.47000000000003, -10.03], [-36.0, -10.25], [-36.5, -10.04], [-37.0, -10.25], [-37.52999999999997, -10.03], [-37.75, -9.5], [-37.52999999999997, -8.97], [-37.0, -8.75], [-36.69999999999999, -8.88], [-36.64999999999998, -8.75]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -1.8343996626925332}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -1.1421480013705332}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [24.807139801560822, 24.37048425507129, 24.70308563500123, 24.999269527859212]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [23.074306742350302, 22.398299153645837, 22.634948984781943, 23.19870529174807]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-1.001066525407195, -1.4540622447581768, -1.1178583022916027, -0.9101214764903555]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-1.256913286828592, -1.8343996626925332, -1.599311392355105, -1.1578952756688068]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.671450323349713, -2.5210727913681077, -1.9659641670003165, -1.6102030411436339]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.2533902966757737, -3.236338658613314, -2.835649695348932, -2.280934931424892]}}