{"version_information": {"version": "det_AHW_tail10.0_v1.2", "compiled_date": "2026-06-27 18:22:55.983726", "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": "2021-Jan-24_to_2021-Jan-27_258.0_51.0"}, "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": 2021010000939}, "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 24 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 27 2021"}, "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": 383113.7910175737}, "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": ["Canada"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.E.North-America", "N.W.North-America"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["North 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": 51.0}, "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": 258.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "258.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 251.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 264.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 49.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 57.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-01-24T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-108.75, 52.5], [-108.53, 53.03], [-108.18, 53.18], [-108.15, 53.25], [-108.25, 53.5], [-108.15, 53.75], [-108.18, 53.82], [-108.25, 53.85], [-108.5, 53.75], [-109.03, 53.97], [-109.25, 54.5], [-109.03, 55.03], [-108.68, 55.18], [-108.65, 55.25], [-108.75, 55.5], [-108.53, 56.03], [-108.18, 56.18], [-108.03, 56.53], [-107.5, 56.75], [-107.25, 56.65], [-107.0, 56.75], [-106.75, 56.65], [-106.68, 56.68], [-106.53, 57.03], [-106.0, 57.25], [-105.75, 57.15], [-105.68, 57.18], [-105.53, 57.53], [-105.0, 57.75], [-104.47, 57.53], [-104.32, 57.18], [-104.25, 57.15], [-104.0, 57.25], [-103.47, 57.03], [-103.25, 56.5], [-103.35, 56.25], [-103.32, 56.18], [-103.25, 56.15], [-103.0, 56.25], [-102.75, 56.15], [-102.5, 56.25], [-101.97, 56.03], [-101.82, 55.68], [-101.47, 55.53], [-101.25, 55.0], [-101.47, 54.47], [-101.82, 54.32], [-101.85, 54.25], [-101.75, 54.0], [-101.85, 53.75], [-101.82, 53.68], [-101.47, 53.53], [-101.32, 53.18], [-100.97, 53.03], [-100.75, 52.5], [-100.96, 52.0], [-100.75, 51.5], [-100.85, 51.25], [-100.82, 51.18], [-100.47, 51.03], [-100.25, 50.5], [-100.47, 49.97], [-100.82, 49.82], [-100.97, 49.47], [-101.5, 49.25], [-101.75, 49.35], [-102.0, 49.25], [-102.53, 49.47], [-102.68, 49.82], [-103.03, 49.97], [-103.25, 50.5], [-103.15, 50.75], [-103.18, 50.82], [-103.25, 50.85], [-103.5, 50.75], [-103.75, 50.85], [-104.0, 50.75], [-104.25, 50.85], [-104.32, 50.82], [-104.47, 50.47], [-105.0, 50.25], [-105.25, 50.35], [-105.5, 50.25], [-105.75, 50.35], [-106.0, 50.25], [-106.25, 50.35], [-106.5, 50.25], [-106.75, 50.35], [-107.0, 50.25], [-107.25, 50.35], [-107.5, 50.25], [-108.03, 50.47], [-108.18, 50.82], [-108.25, 50.85], [-108.5, 50.75], [-109.03, 50.97], [-109.25, 51.5], [-109.03, 52.03], [-108.68, 52.18], [-108.65, 52.25], [-108.75, 52.5]]]]}, "2021-01-25T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-108.75, 52.5], [-108.53, 53.03], [-108.18, 53.18], [-108.15, 53.25], [-108.25, 53.5], [-108.15, 53.75], [-108.18, 53.82], [-108.25, 53.85], [-108.5, 53.75], [-109.03, 53.97], [-109.25, 54.5], [-109.03, 55.03], [-108.68, 55.18], [-108.65, 55.25], [-108.75, 55.5], [-108.53, 56.03], [-108.18, 56.18], [-108.03, 56.53], [-107.5, 56.75], [-107.25, 56.65], [-107.0, 56.75], [-106.75, 56.65], [-106.68, 56.68], [-106.53, 57.03], [-106.0, 57.25], [-105.75, 57.15], [-105.68, 57.18], [-105.53, 57.53], [-105.0, 57.75], [-104.47, 57.53], [-104.32, 57.18], [-104.25, 57.15], [-104.0, 57.25], [-103.47, 57.03], [-103.25, 56.5], [-103.35, 56.25], [-103.32, 56.18], [-103.25, 56.15], [-103.0, 56.25], [-102.75, 56.15], [-102.5, 56.25], [-101.97, 56.03], [-101.82, 55.68], [-101.47, 55.53], [-101.25, 55.0], [-101.37, 54.7], [-101.25, 54.65], [-101.0, 54.75], [-100.75, 54.65], [-100.5, 54.75], [-99.97, 54.53], [-99.82, 54.18], [-99.75, 54.15], [-99.5, 54.25], [-98.97, 54.03], [-98.82, 53.68], [-98.47, 53.53], [-98.32, 53.18], [-97.97, 53.03], [-97.82, 52.68], [-97.75, 52.65], [-97.68, 52.68], [-97.65, 52.75], [-97.75, 53.0], [-97.53, 53.53], [-97.0, 53.75], [-96.75, 53.65], [-96.5, 53.75], [-95.97, 53.53], [-95.82, 53.18], [-95.75, 53.15], [-95.5, 53.25], [-94.97, 53.03], [-94.75, 52.5], [-94.96, 52.0], [-94.75, 51.5], [-94.85, 51.25], [-94.75, 51.0], [-94.97, 50.47], [-95.32, 50.32], [-95.35, 50.25], [-95.25, 50.0], [-95.47, 49.47], [-96.0, 49.25], [-96.25, 49.35], [-96.5, 49.25], [-97.03, 49.47], [-97.18, 49.82], [-97.25, 49.85], [-97.5, 49.75], [-98.03, 49.97], [-98.18, 50.32], [-98.25, 50.35], [-98.5, 50.25], [-98.75, 50.35], [-98.82, 50.32], [-98.97, 49.97], [-99.5, 49.75], [-99.75, 49.85], [-100.0, 49.75], [-100.5, 49.96], [-100.82, 49.82], [-100.97, 49.47], [-101.5, 49.25], [-101.75, 49.35], [-102.0, 49.25], [-102.53, 49.47], [-102.68, 49.82], [-103.03, 49.97], [-103.25, 50.5], [-103.15, 50.75], [-103.18, 50.82], [-103.25, 50.85], [-103.5, 50.75], [-103.75, 50.85], [-104.0, 50.75], [-104.25, 50.85], [-104.32, 50.82], [-104.47, 50.47], [-105.0, 50.25], [-105.25, 50.35], [-105.5, 50.25], [-105.75, 50.35], [-106.0, 50.25], [-106.25, 50.35], [-106.5, 50.25], [-106.75, 50.35], [-107.0, 50.25], [-107.25, 50.35], [-107.5, 50.25], [-108.03, 50.47], [-108.18, 50.82], [-108.25, 50.85], [-108.5, 50.75], [-109.03, 50.97], [-109.25, 51.5], [-109.03, 52.03], [-108.68, 52.18], [-108.65, 52.25], [-108.75, 52.5]]]]}, "2021-01-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-108.75, 52.5], [-108.53, 53.03], [-108.18, 53.18], [-108.15, 53.25], [-108.25, 53.5], [-108.15, 53.75], [-108.18, 53.82], [-108.25, 53.85], [-108.5, 53.75], [-109.03, 53.97], [-109.25, 54.5], [-109.03, 55.03], [-108.68, 55.18], [-108.65, 55.25], [-108.75, 55.5], [-108.53, 56.03], [-108.18, 56.18], [-108.03, 56.53], [-107.5, 56.75], [-107.25, 56.65], [-107.0, 56.75], [-106.75, 56.65], [-106.68, 56.68], [-106.53, 57.03], [-106.0, 57.25], [-105.75, 57.15], [-105.68, 57.18], [-105.53, 57.53], [-105.0, 57.75], [-104.47, 57.53], [-104.32, 57.18], [-104.25, 57.15], [-104.0, 57.25], [-103.47, 57.03], [-103.25, 56.5], [-103.35, 56.25], [-103.32, 56.18], [-103.25, 56.15], [-103.0, 56.25], [-102.75, 56.15], [-102.5, 56.25], [-101.97, 56.03], [-101.82, 55.68], [-101.47, 55.53], [-101.25, 55.0], [-101.37, 54.7], [-101.25, 54.65], [-101.0, 54.75], [-100.75, 54.65], [-100.5, 54.75], [-99.97, 54.53], [-99.82, 54.18], [-99.75, 54.15], [-99.5, 54.25], [-98.97, 54.03], [-98.82, 53.68], [-98.47, 53.53], [-98.32, 53.18], [-97.97, 53.03], [-97.82, 52.68], [-97.75, 52.65], [-97.68, 52.68], [-97.65, 52.75], [-97.75, 53.0], [-97.53, 53.53], [-97.0, 53.75], [-96.75, 53.65], [-96.5, 53.75], [-95.97, 53.53], [-95.82, 53.18], [-95.75, 53.15], [-95.5, 53.25], [-94.97, 53.03], [-94.75, 52.5], [-94.96, 52.0], [-94.75, 51.5], [-94.85, 51.25], [-94.75, 51.0], [-94.97, 50.47], [-95.32, 50.32], [-95.35, 50.25], [-95.25, 50.0], [-95.47, 49.47], [-96.0, 49.25], [-96.25, 49.35], [-96.5, 49.25], [-97.03, 49.47], [-97.18, 49.82], [-97.25, 49.85], [-97.5, 49.75], [-98.03, 49.97], [-98.18, 50.32], [-98.25, 50.35], [-98.5, 50.25], [-98.75, 50.35], [-98.82, 50.32], [-98.97, 49.97], [-99.5, 49.75], [-99.75, 49.85], [-100.0, 49.75], [-100.5, 49.96], [-100.82, 49.82], [-100.97, 49.47], [-101.5, 49.25], [-101.75, 49.35], [-102.0, 49.25], [-102.53, 49.47], [-102.68, 49.82], [-103.03, 49.97], [-103.25, 50.5], [-103.15, 50.75], [-103.18, 50.82], [-103.25, 50.85], [-103.5, 50.75], [-103.75, 50.85], [-104.0, 50.75], [-104.25, 50.85], [-104.32, 50.82], [-104.47, 50.47], [-105.0, 50.25], [-105.25, 50.35], [-105.5, 50.25], [-105.75, 50.35], [-106.0, 50.25], [-106.25, 50.35], [-106.5, 50.25], [-106.75, 50.35], [-107.0, 50.25], [-107.25, 50.35], [-107.5, 50.25], [-108.03, 50.47], [-108.18, 50.82], [-108.25, 50.85], [-108.5, 50.75], [-109.03, 50.97], [-109.25, 51.5], [-109.03, 52.03], [-108.68, 52.18], [-108.65, 52.25], [-108.75, 52.5]]]]}, "2021-01-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-104.53, 52.97], [-104.75, 53.5], [-104.53, 54.03], [-104.0, 54.25], [-103.75, 54.15], [-103.68, 54.18], [-103.53, 54.53], [-103.0, 54.75], [-102.75, 54.65], [-102.5, 54.75], [-102.25, 54.65], [-102.0, 54.75], [-101.75, 54.65], [-101.5, 54.75], [-101.25, 54.65], [-101.0, 54.75], [-100.75, 54.65], [-100.5, 54.75], [-99.97, 54.53], [-99.82, 54.18], [-99.75, 54.15], [-99.5, 54.25], [-98.97, 54.03], [-98.82, 53.68], [-98.47, 53.53], [-98.32, 53.18], [-97.97, 53.03], [-97.82, 52.68], [-97.75, 52.65], [-97.68, 52.68], [-97.65, 52.75], [-97.75, 53.0], [-97.53, 53.53], [-97.0, 53.75], [-96.75, 53.65], [-96.5, 53.75], [-95.97, 53.53], [-95.82, 53.18], [-95.75, 53.15], [-95.5, 53.25], [-94.97, 53.03], [-94.75, 52.5], [-94.96, 52.0], [-94.75, 51.5], [-94.85, 51.25], [-94.75, 51.0], [-94.97, 50.47], [-95.32, 50.32], [-95.35, 50.25], [-95.25, 50.0], [-95.47, 49.47], [-96.0, 49.25], [-96.25, 49.35], [-96.5, 49.25], [-97.03, 49.47], [-97.18, 49.82], [-97.25, 49.85], [-97.5, 49.75], [-98.03, 49.97], [-98.18, 50.32], [-98.25, 50.35], [-98.5, 50.25], [-98.75, 50.35], [-98.82, 50.32], [-98.97, 49.97], [-99.5, 49.75], [-99.75, 49.85], [-100.0, 49.75], [-100.5, 49.96], [-100.82, 49.82], [-100.97, 49.47], [-101.5, 49.25], [-101.75, 49.35], [-102.0, 49.25], [-102.53, 49.47], [-102.68, 49.82], [-103.03, 49.97], [-103.25, 50.5], [-103.15, 50.75], [-103.18, 50.82], [-103.53, 50.97], [-103.75, 51.5], [-103.65, 51.75], [-103.75, 52.0], [-103.53, 52.53], [-103.0, 52.75], [-103.25, 52.85], [-103.5, 52.75], [-103.75, 52.85], [-104.0, 52.75], [-104.53, 52.97]], [[-102.75, 52.65], [-102.62, 52.7], [-102.68, 52.82], [-102.75, 52.85], [-103.0, 52.75], [-102.75, 52.65]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -19.986130962597258}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -14.66370575077141}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-31.132187509933402, -31.14584791117744, -30.39885544190585, -28.531754958798388]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-35.457472926169544, -37.38810748682283, -34.57094932892491, -30.96509703962724]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-15.298301967246699, -15.150950664610846, -14.618766239449512, -12.580630168494352]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-19.047819320799448, -19.986130962597258, -19.91616944602484, -15.436133772944999]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.7437441368761981, -1.758469996511354, -1.7017040658694114, -1.4982004297329115]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.1781284153917864, -2.262294763785484, -2.3182787881118796, -1.828071186503496]}}