{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:08:49.169242", "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-Nov-19_to_2025-Nov-23_5.5_43.5"}, "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": 2025110000540}, "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": "November 19 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "November 23 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": 50930.72442287935}, "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": ["France"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Europe"]}, "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": ["Mediterranean Sea"]}, "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": 43.5}, "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": 5.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "5.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 2.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 6.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 43.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 45.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[5.53, 45.03], [5.68, 44.68], [5.75, 44.65], [6.0, 44.75], [6.53, 44.53], [6.68, 44.18], [7.03, 44.03], [7.25, 43.5], [7.15, 43.25], [7.25, 43.0], [7.03, 42.47], [6.5, 42.25], [6.25, 42.35], [6.0, 42.25], [5.47, 42.47], [5.32, 42.82], [5.25, 42.85], [5.0, 42.75], [4.47, 42.97], [4.32, 43.32], [4.25, 43.35], [4.0, 43.25], [3.75, 43.35], [3.5, 43.25], [2.97, 43.47], [2.82, 43.82], [2.75, 43.85], [2.5, 43.75], [1.97, 43.97], [1.75, 44.5], [1.85, 44.75], [1.75, 45.0], [1.85, 45.25], [1.75, 45.5], [1.97, 46.03], [2.5, 46.25], [2.75, 46.15], [3.0, 46.25], [3.25, 46.15], [3.5, 46.25], [4.03, 46.03], [4.25, 45.5], [4.12, 45.2], [4.25, 45.15], [4.5, 45.25], [4.75, 45.15], [5.0, 45.25], [5.53, 45.03]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["West&Central-Europe", "Mediterranean"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-11-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[1.75, 45.0], [1.85, 45.25], [1.75, 45.5], [1.97, 46.03], [2.5, 46.25], [3.03, 46.03], [3.25, 45.5], [3.15, 45.25], [3.18, 45.18], [3.53, 45.03], [3.68, 44.68], [3.75, 44.65], [4.0, 44.75], [4.25, 44.65], [4.5, 44.75], [5.03, 44.53], [5.2, 44.13], [5.5, 44.25], [6.03, 44.03], [6.25, 43.5], [6.03, 42.97], [5.5, 42.75], [4.97, 42.97], [4.8, 43.38], [4.5, 43.25], [4.25, 43.35], [4.0, 43.25], [3.75, 43.35], [3.5, 43.25], [2.97, 43.47], [2.82, 43.82], [2.75, 43.85], [2.5, 43.75], [1.97, 43.97], [1.75, 44.5], [1.85, 44.75], [1.75, 45.0]]]]}, "2025-11-20T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[1.75, 45.0], [1.85, 45.25], [1.75, 45.5], [1.97, 46.03], [2.5, 46.25], [2.75, 46.15], [3.0, 46.25], [3.25, 46.15], [3.5, 46.25], [4.03, 46.03], [4.25, 45.5], [4.12, 45.2], [4.25, 45.15], [4.5, 45.25], [5.03, 45.03], [5.25, 44.5], [5.15, 44.25], [5.2, 44.13], [5.5, 44.25], [6.03, 44.03], [6.18, 43.68], [6.25, 43.65], [6.5, 43.75], [7.03, 43.53], [7.25, 43.0], [7.03, 42.47], [6.5, 42.25], [6.25, 42.35], [6.0, 42.25], [5.47, 42.47], [5.32, 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45.0]]]]}, "2025-11-22T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[1.75, 45.0], [1.85, 45.25], [1.75, 45.5], [1.97, 46.03], [2.5, 46.25], [2.75, 46.15], [3.0, 46.25], [3.25, 46.15], [3.5, 46.25], [4.03, 46.03], [4.25, 45.5], [4.12, 45.2], [4.25, 45.15], [4.5, 45.25], [4.75, 45.15], [5.0, 45.25], [5.53, 45.03], [5.68, 44.68], [5.75, 44.65], [6.0, 44.75], [6.53, 44.53], [6.68, 44.18], [7.03, 44.03], [7.25, 43.5], [7.15, 43.25], [7.25, 43.0], [7.03, 42.47], [6.5, 42.25], [6.25, 42.35], [6.0, 42.25], [5.47, 42.47], [5.32, 42.82], [5.25, 42.85], [5.0, 42.75], [4.47, 42.97], [4.25, 43.5], [4.35, 43.75], [4.32, 43.82], [4.25, 43.85], [4.18, 43.82], [4.03, 43.47], [3.5, 43.25], [2.97, 43.47], [2.82, 43.82], [2.75, 43.85], [2.5, 43.75], [1.97, 43.97], [1.75, 44.5], [1.85, 44.75], [1.75, 45.0]]]]}, "2025-11-23T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[4.25, 44.0], [4.35, 44.25], [4.25, 44.5], [4.47, 45.03], [5.0, 45.25], [5.53, 45.03], [5.68, 44.68], 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{"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.267026830930803, -5.002990116817244, -6.3230869078227405, -6.331677024776091, -5.3363522998292225]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.151946882484708, -5.9684146023384415, -7.485590979031258, -8.6972462102039, -6.3740150461388225]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4603998145954904, -1.3956967725548581, -1.7668768056519122, -1.7054193866210499, -1.4493844641925024]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.6048046467156898, -1.5636715818122777, -2.4972875489296067, -2.000569261527194, -1.7575482166126268]}}