{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:10:18.164394", "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": "2026-Feb-22_to_2026-Feb-24_27.0_-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": 2026020000560}, "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": "February 22 2026"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "February 24 2026"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 3}, "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": 64056.54524212583}, "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": ["Congo, The Democratic Republic of the"]}, "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": []}, "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": 27.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "27.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 25.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 28.25}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -11.25}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -7.75}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[24.75, -8.0], [24.97, -7.47], [25.5, -7.25], [26.03, -7.47], [26.18, -7.82], [26.25, -7.85], [26.5, -7.75], [26.75, -7.85], [27.0, -7.75], [27.25, -7.85], [27.5, -7.75], [28.03, -7.97], [28.25, -8.5], [28.15, -8.75], [28.25, -9.0], [28.15, -9.25], [28.25, -9.5], [28.15, -9.75], [28.25, -10.0], [28.15, -10.25], [28.18, -10.32], [28.53, -10.47], [28.75, -11.0], [28.53, -11.53], [28.0, -11.75], [27.47, -11.53], [27.32, -11.18], [26.97, -11.03], [26.82, -10.68], [26.75, -10.65], [26.5, -10.75], [26.25, -10.65], [26.0, -10.75], [25.47, -10.53], [25.25, -10.0], [25.35, -9.75], [25.32, -9.68], [24.97, -9.53], [24.75, -9.0], [24.85, -8.75], [24.75, -8.5], [24.85, -8.25], [24.75, -8.0]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["Central-Africa", "S.Eastern-Africa", "E.Southern-Africa"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2026-02-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[24.75, -8.5], [24.85, -8.25], [24.75, -8.0], [24.97, -7.47], [25.5, -7.25], [26.03, -7.47], [26.18, -7.82], [26.25, -7.85], [26.5, -7.75], [26.75, -7.85], [27.0, -7.75], [27.25, -7.85], [27.5, -7.75], [28.03, -7.97], [28.25, -8.5], [28.15, -8.75], [28.25, -9.0], [28.15, -9.25], [28.25, -9.5], [28.15, -9.75], [28.25, -10.0], [28.15, -10.25], [28.18, -10.32], [28.53, -10.47], [28.75, -11.0], [28.53, -11.53], [28.0, -11.75], [27.47, -11.53], [27.32, -11.18], [26.97, -11.03], [26.82, -10.68], [26.75, -10.65], [26.5, -10.75], [26.25, -10.65], [26.0, -10.75], [25.47, -10.53], [25.25, -10.0], [25.35, -9.75], [25.32, -9.68], [24.97, -9.53], [24.75, -9.0], [24.85, -8.75], [24.75, -8.5]]]]}, "2026-02-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[24.75, -8.5], [24.85, -8.25], [24.75, -8.0], [24.97, -7.47], [25.5, -7.25], [26.03, -7.47], [26.18, -7.82], [26.25, -7.85], [26.5, -7.75], [26.75, -7.85], [27.0, -7.75], [27.25, -7.85], [27.5, -7.75], [28.03, -7.97], [28.25, -8.5], [28.15, -8.75], [28.25, -9.0], [28.15, -9.25], [28.25, -9.5], [28.15, -9.75], [28.25, -10.0], [28.15, -10.25], [28.18, -10.32], [28.53, -10.47], [28.75, -11.0], [28.53, -11.53], [28.0, -11.75], [27.47, -11.53], [27.32, -11.18], [26.97, -11.03], [26.82, -10.68], [26.75, -10.65], [26.5, -10.75], [26.25, -10.65], [26.0, -10.75], [25.47, -10.53], [25.25, -10.0], [25.35, -9.75], [25.32, -9.68], [24.97, -9.53], [24.75, -9.0], [24.85, -8.75], [24.75, -8.5]]]]}, "2026-02-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[24.75, -8.5], [24.85, -8.25], [24.75, -8.0], [24.97, -7.47], [25.5, -7.25], [26.03, -7.47], [26.18, -7.82], [26.25, -7.85], [26.5, -7.75], [26.75, -7.85], [27.0, -7.75], [27.25, -7.85], [27.5, -7.75], [28.03, -7.97], [28.25, -8.5], [28.15, -8.75], [28.25, -9.0], [28.15, -9.25], [28.25, -9.5], [28.15, -9.75], [28.25, -10.0], [28.15, -10.25], [28.18, -10.32], [28.53, -10.47], [28.75, -11.0], [28.53, -11.53], [28.0, -11.75], [27.47, -11.53], [27.32, -11.18], [26.97, -11.03], [26.82, -10.68], [26.75, -10.65], [26.5, -10.75], [26.25, -10.65], [26.0, -10.75], [25.47, -10.53], [25.25, -10.0], [25.35, -9.75], [25.32, -9.68], [24.97, -9.53], [24.75, -9.0], [24.85, -8.75], [24.75, -8.5]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -3.2327825219782653}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -1.9029378781162418}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [19.946506875658827, 20.650022367447207, 20.53523328266448]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [17.559536234537802, 17.979433949788415, 17.882695770263695]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-2.3283826221121497, -1.6479480329723786, -1.7324829792641967]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-3.2327825219782653, -2.080543813721931, -2.1001191738362763]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-2.3006280582484386, -1.6573334001983235, -1.7494664800659105]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-3.4130432307011307, -2.237949148650423, -2.3059384442242457]}}