{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-04-05 17:02:57.696202", "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-Jan-17_to_2025-Jan-20_241.5_32.0"}, "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": 2025010000481}, "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": "January 17 2025"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 20 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": 180181.44865534734}, "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": ["Mexico", "United States"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["America", "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": ["Pacific 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": 32.0}, "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": 241.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "241.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 236.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 244.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 30.0}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 34.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "MultiPolygon", "coordinates": [[[[-116.47, 33.03], [-116.32, 32.68], [-115.97, 32.53], [-115.75, 32.0], [-115.85, 31.75], [-115.82, 31.68], [-115.47, 31.53], [-115.25, 31.0], [-115.35, 30.75], [-115.25, 30.5], [-115.47, 29.97], [-116.0, 29.75], [-116.53, 29.97], [-116.7, 30.38], [-117.0, 30.25], [-117.25, 30.35], [-117.5, 30.25], [-118.03, 30.47], [-118.18, 30.82], [-118.25, 30.85], [-118.37, 30.8], [-118.25, 30.5], [-118.35, 30.25], [-118.25, 30.0], [-118.47, 29.47], [-119.0, 29.25], [-119.25, 29.35], [-119.5, 29.25], [-120.03, 29.47], [-120.18, 29.82], [-120.53, 29.97], [-120.68, 30.32], [-121.03, 30.47], [-121.18, 30.82], [-121.53, 30.97], [-121.68, 31.32], [-121.75, 31.35], [-122.0, 31.25], [-122.53, 31.47], [-122.75, 32.0], [-122.65, 32.25], [-122.75, 32.5], [-122.65, 32.75], [-122.68, 32.82], [-123.03, 32.97], [-123.18, 33.32], [-123.25, 33.35], [-123.5, 33.25], [-123.75, 33.35], [-124.0, 33.25], [-124.53, 33.47], [-124.75, 34.0], [-124.53, 34.53], [-124.0, 34.75], [-123.75, 34.65], [-123.5, 34.75], [-123.25, 34.65], [-123.18, 34.68], [-123.03, 35.03], [-122.5, 35.25], [-122.25, 35.15], [-122.0, 35.25], [-121.47, 35.03], [-121.32, 34.68], [-120.97, 34.53], [-120.82, 34.18], [-120.75, 34.15], [-120.5, 34.25], [-120.25, 34.15], [-120.0, 34.25], [-119.75, 34.15], [-119.5, 34.25], [-119.25, 34.15], [-119.0, 34.25], [-118.47, 34.03], [-118.32, 33.68], [-118.25, 33.65], [-118.0, 33.75], [-117.47, 33.53], [-117.32, 33.18], [-117.25, 33.15], [-117.0, 33.25], [-116.47, 33.03]]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.North-America", "N.Central-America", "N.Pacific-Ocean"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2025-01-17T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-117.53, 31.97], [-117.75, 32.5], [-117.53, 33.03], [-117.0, 33.25], [-116.47, 33.03], [-116.32, 32.68], [-115.97, 32.53], [-115.75, 32.0], [-115.85, 31.75], [-115.82, 31.68], [-115.47, 31.53], [-115.25, 31.0], [-115.35, 30.75], [-115.25, 30.5], [-115.47, 29.97], [-116.0, 29.75], [-116.53, 29.97], [-116.75, 30.5], [-116.65, 30.75], [-116.68, 30.82], [-117.03, 30.97], [-117.25, 31.5], [-117.15, 31.75], [-117.18, 31.82], [-117.53, 31.97]]]]}, "2025-01-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-124.0, 33.25], [-124.53, 33.47], [-124.75, 34.0], [-124.53, 34.53], [-124.0, 34.75], [-123.75, 34.65], [-123.5, 34.75], [-123.25, 34.65], [-123.18, 34.68], [-123.03, 35.03], [-122.5, 35.25], [-122.25, 35.15], [-122.0, 35.25], [-121.47, 35.03], [-121.32, 34.68], [-120.97, 34.53], [-120.82, 34.18], [-120.75, 34.15], [-120.5, 34.25], [-120.25, 34.15], [-120.0, 34.25], [-119.75, 34.15], [-119.5, 34.25], [-119.25, 34.15], [-119.0, 34.25], [-118.47, 34.03], [-118.32, 33.68], [-118.25, 33.65], [-118.0, 33.75], [-117.47, 33.53], [-117.32, 33.18], [-117.25, 33.15], [-117.0, 33.25], [-116.47, 33.03], [-116.32, 32.68], [-115.97, 32.53], [-115.75, 32.0], [-115.85, 31.75], [-115.82, 31.68], [-115.47, 31.53], [-115.25, 31.0], [-115.35, 30.75], [-115.25, 30.5], [-115.47, 29.97], [-116.0, 29.75], [-116.53, 29.97], [-116.69999999999999, 30.38], [-117.0, 30.25], [-117.25, 30.35], [-117.5, 30.25], [-118.03, 30.47], [-118.18, 30.82], [-118.25, 30.85], [-118.37, 30.8], [-118.25, 30.5], [-118.35, 30.25], [-118.25, 30.0], [-118.47, 29.47], [-119.0, 29.25], [-119.25, 29.35], [-119.5, 29.25], [-120.03, 29.47], [-120.18, 29.82], [-120.53, 29.97], [-120.68, 30.32], [-121.03, 30.47], [-121.18, 30.82], [-121.53, 30.97], [-121.68, 31.32], [-121.75, 31.35], [-122.0, 31.25], [-122.53, 31.47], [-122.75, 32.0], [-122.65, 32.25], [-122.75, 32.5], [-122.65, 32.75], [-122.68, 32.82], [-123.03, 32.97], [-123.18, 33.32], [-123.25, 33.35], [-123.5, 33.25], [-123.75, 33.35], [-124.0, 33.25]]]]}, "2025-01-19T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-124.0, 33.25], [-124.53, 33.47], [-124.75, 34.0], [-124.53, 34.53], [-124.0, 34.75], [-123.75, 34.65], [-123.5, 34.75], [-123.25, 34.65], [-123.18, 34.68], [-123.03, 35.03], [-122.5, 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-4.555624188816239}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -1.9249381338505178}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [10.199835968017624, 12.208267779511516, 12.057017889345445, 12.320102809025741]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [8.421938832600915, 8.13612009684249, 8.480593617757165, 11.431666310628259]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-3.3837040729578804, -1.885323170979851, -1.997810077800377, -1.7774218047735784]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-4.555624188816239, -4.189138811076646, -3.6873051618375143, -2.4346417761734074]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4630701151825867, -1.5848682059258907, -1.7671381951101315, -1.694950778777102]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.717420509941456, -1.8439360541679126, -2.327275951059942, -2.099969969944484]}}