{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:04:57.965610", "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-May-05_to_2025-May-09_254.0_37.0"}, "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": 2025050000179}, "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": "May 05 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "May 09 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": 151116.9912868832}, "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": ["United States"]}, "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": []}, "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": 37.0}, "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": 254.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "254.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 253.5}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 257.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 32.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 38.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-105.65, 32.75], [-105.68, 32.82], [-106.03, 32.97], [-106.25, 33.5], [-106.15, 33.75], [-106.18, 33.82], [-106.53, 33.97], [-106.68, 34.32], [-107.03, 34.47], [-107.25, 35.0], [-107.04, 35.5], [-107.25, 36.0], [-107.15, 36.25], [-107.25, 36.5], [-107.03, 37.03], [-106.68, 37.18], [-106.53, 37.53], [-106.18, 37.68], [-106.15, 37.75], [-106.25, 38.0], [-106.15, 38.25], [-106.25, 38.5], [-106.03, 39.03], [-105.5, 39.25], [-104.97, 39.03], [-104.82, 38.68], [-104.47, 38.53], [-104.32, 38.18], [-103.97, 38.03], [-103.82, 37.68], [-103.47, 37.53], [-103.25, 37.0], [-103.35, 36.75], [-103.32, 36.68], [-102.97, 36.53], [-102.82, 36.18], [-102.75, 36.15], [-102.5, 36.25], [-101.97, 36.03], [-101.75, 35.5], [-101.85, 35.25], [-101.75, 35.0], [-101.97, 34.47], [-102.32, 34.32], [-102.47, 33.97], [-103.0, 33.75], [-103.25, 33.85], [-103.32, 33.82], [-103.35, 33.75], [-103.25, 33.5], [-103.47, 32.97], [-103.82, 32.82], [-103.85, 32.75], [-103.75, 32.5], [-103.97, 31.97], [-104.5, 31.75], [-104.75, 31.85], [-105.0, 31.75], [-105.53, 31.97], [-105.75, 32.5], [-105.65, 32.75]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.North-America", "C.North-America", "N.Central-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-05-05T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-105.25, 36.0], [-105.03, 36.53], [-104.5, 36.75], [-104.25, 36.65], [-104.0, 36.75], [-103.47000000000003, 36.53], [-103.25, 36.0], [-103.35000000000002, 35.75], [-103.25, 35.5], [-103.47000000000003, 34.97], [-104.0, 34.75], [-104.25, 34.85], [-104.5, 34.75], [-105.03, 34.97], [-105.25, 35.5], [-105.15, 35.75], [-105.25, 36.0]]]]}, "2025-05-06T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-107.25, 36.5], [-107.03, 37.03], [-106.68, 37.18], [-106.53, 37.53], [-106.18, 37.68], [-106.15, 37.75], [-106.25, 38.0], [-106.15, 38.25], [-106.25, 38.5], [-106.03, 39.03], [-105.5, 39.25], [-104.97, 39.03], [-104.82, 38.68], [-104.47, 38.53], [-104.32, 38.18], [-103.97000000000003, 38.03], [-103.82, 37.68], [-103.47000000000003, 37.53], [-103.25, 37.0], [-103.35000000000002, 36.75], [-103.32, 36.68], [-102.97000000000003, 36.53], [-102.82, 36.18], [-102.75, 36.15], [-102.5, 36.25], [-101.97000000000003, 36.03], [-101.75, 35.5], [-101.85000000000002, 35.25], [-101.75, 35.0], [-101.97000000000003, 34.47], [-102.32, 34.32], [-102.47000000000003, 33.97], [-103.0, 33.75], [-103.25, 33.85], [-103.32, 33.82], [-103.35000000000002, 33.75], [-103.25, 33.5], [-103.47000000000003, 32.97], [-103.82, 32.82], [-103.85000000000002, 32.75], [-103.75, 32.5], [-103.97000000000003, 31.97], [-104.5, 31.75], [-104.75, 31.85], [-105.0, 31.75], [-105.53, 31.97], [-105.75, 32.5], [-105.65, 32.75], [-105.68, 32.82], [-106.03, 32.97], [-106.25, 33.5], [-106.15, 33.75], [-106.18, 33.82], [-106.53, 33.97], [-106.68, 34.32], [-107.03, 34.47], [-107.25, 35.0], [-107.03999999999999, 35.5], [-107.25, 36.0], [-107.15, 36.25], [-107.25, 36.5]]]]}, "2025-05-07T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-107.25, 36.5], [-107.03, 37.03], [-106.68, 37.18], [-106.53, 37.53], [-106.18, 37.68], [-106.15, 37.75], [-106.25, 38.0], [-106.15, 38.25], [-106.25, 38.5], [-106.03, 39.03], [-105.5, 39.25], [-104.97, 39.03], [-104.82, 38.68], [-104.47, 38.53], [-104.32, 38.18], [-103.97000000000003, 38.03], [-103.82, 37.68], [-103.47000000000003, 37.53], [-103.25, 37.0], [-103.35000000000002, 36.75], [-103.32, 36.68], [-102.97000000000003, 36.53], [-102.82, 36.18], [-102.75, 36.15], [-102.5, 36.25], [-101.97000000000003, 36.03], [-101.75, 35.5], [-101.85000000000002, 35.25], [-101.75, 35.0], [-101.97000000000003, 34.47], [-102.32, 34.32], [-102.47000000000003, 33.97], [-103.0, 33.75], [-103.25, 33.85], [-103.32, 33.82], [-103.35000000000002, 33.75], [-103.25, 33.5], [-103.47000000000003, 32.97], [-103.82, 32.82], [-103.85000000000002, 32.75], [-103.75, 32.5], [-103.97000000000003, 31.97], [-104.5, 31.75], [-104.75, 31.85], [-105.0, 31.75], [-105.53, 31.97], [-105.75, 32.5], [-105.65, 32.75], [-105.68, 32.82], [-106.03, 32.97], [-106.25, 33.5], [-106.15, 33.75], [-106.18, 33.82], [-106.53, 33.97], [-106.68, 34.32], [-107.03, 34.47], [-107.25, 35.0], [-107.03999999999999, 35.5], [-107.25, 36.0], [-107.15, 36.25], [-107.25, 36.5]]]]}, "2025-05-08T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-107.25, 36.5], [-107.03, 37.03], [-106.68, 37.18], [-106.53, 37.53], [-106.18, 37.68], [-106.15, 37.75], [-106.25, 38.0], [-106.15, 38.25], [-106.25, 38.5], [-106.03, 39.03], [-105.5, 39.25], [-104.97, 39.03], [-104.82, 38.68], [-104.47, 38.53], [-104.32, 38.18], [-103.97000000000003, 38.03], [-103.82, 37.68], [-103.47000000000003, 37.53], [-103.25, 37.0], [-103.35000000000002, 36.75], [-103.32, 36.68], [-102.97000000000003, 36.53], [-102.82, 36.18], [-102.75, 36.15], [-102.5, 36.25], [-101.97000000000003, 36.03], [-101.75, 35.5], [-101.85000000000002, 35.25], [-101.75, 35.0], [-101.97000000000003, 34.47], [-102.32, 34.32], [-102.47000000000003, 33.97], [-103.0, 33.75], [-103.25, 33.85], [-103.32, 33.82], [-103.35000000000002, 33.75], [-103.25, 33.5], [-103.47000000000003, 32.97], [-103.82, 32.82], [-103.85000000000002, 32.75], [-103.75, 32.5], [-103.97000000000003, 31.97], [-104.5, 31.75], [-104.75, 31.85], [-105.0, 31.75], [-105.53, 31.97], [-105.75, 32.5], [-105.65, 32.75], [-105.68, 32.82], [-106.03, 32.97], [-106.25, 33.5], [-106.15, 33.75], [-106.18, 33.82], [-106.53, 33.97], [-106.68, 34.32], [-107.03, 34.47], [-107.25, 35.0], [-107.03999999999999, 35.5], [-107.25, 36.0], [-107.15, 36.25], [-107.25, 36.5]]]]}, "2025-05-09T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-105.0, 31.75], [-105.53, 31.97], [-105.75, 32.5], [-105.53, 33.03], [-105.0, 33.25], [-104.47, 33.03], [-104.25, 32.5], [-104.47, 31.97], [-105.0, 31.75]]], [[[-106.75, 37.0], [-106.53, 37.53], [-106.0, 37.75], [-105.69999999999999, 37.63], [-105.53, 38.03], [-105.0, 38.25], [-104.47, 38.03], [-104.25, 37.5], [-104.35, 37.25], [-104.25, 37.0], [-104.35, 36.75], [-104.25, 36.5], [-104.47, 35.97], [-104.82, 35.82], [-104.97, 35.47], [-105.5, 35.25], [-106.03, 35.47], [-106.25, 36.0], [-106.12, 36.3], [-106.53, 36.47], [-106.75, 37.0]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -10.443349334358004}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -6.857272960755371}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [9.534034983317042, 7.323567962646507, 7.226194254557299, 9.44650149875224, 5.415084245469814]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [8.177996571858728, 0.2676394144694427, -0.23151245117185226, 0.702424621582054, 2.395118967692099]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-5.726907931525076, -7.343619167149284, -7.758855398552688, -5.74336754774754, -4.870617335074883]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.912797567602297, -9.763313371815173, -10.443349334358004, -8.156506574113678, -5.264446113023325]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4756741765961108, -2.01177982215193, -2.1667130786354933, -1.5896513460863093, -1.4652850626328249]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.4984438026659281, -2.7718852209555043, -3.030503506451063, -2.374924391642022, -1.6377421468373194]}}