{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-03-19 18:21:51.930706", "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-22_to_2021-Jan-25_244.0_50.0"}, "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": 2021010000897}, "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 22 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 25 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": 67275.74432000436}, "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", "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": []}, "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": 50.0}, "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": 244.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "244.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 241.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 245.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 48.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 52.0}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "Polygon", "coordinates": [[[-115.323, 49.323], [-115.354, 49.25], [-115.354, 49.249], [-115.25, 49.0], [-115.47, 48.47], [-116.0, 48.25], [-116.25, 48.354], [-116.5, 48.25], [-116.75, 48.354], [-117.0, 48.25], [-117.25, 48.354], [-117.5, 48.25], [-117.75, 48.354], [-117.823, 48.323], [-117.97, 47.97], [-118.5, 47.75], [-119.03, 47.97], [-119.25, 48.5], [-119.146, 48.75], [-119.25, 49.0], [-119.146, 49.25], [-119.25, 49.5], [-119.146, 49.75], [-119.25, 50.0], [-119.043, 50.5], [-119.25, 51.0], [-119.146, 51.25], [-119.177, 51.323], [-119.53, 51.47], [-119.75, 52.0], [-119.53, 52.53], [-119.0, 52.75], [-118.5, 52.543], [-118.0, 52.75], [-117.75, 52.646], [-117.5, 52.75], [-117.25, 52.646], [-117.0, 52.75], [-116.47, 52.53], [-116.25, 52.0], [-116.427, 51.573], [-116.0, 51.75], [-115.47, 51.53], [-115.323, 51.177], [-115.25, 51.146], [-115.0, 51.25], [-114.47, 51.03], [-114.25, 50.5], [-114.47, 49.97], [-114.823, 49.823], [-114.97, 49.47], [-115.323, 49.323]], [[-116.573, 51.427], [-116.875, 51.302], [-116.823, 51.177], [-116.75, 51.146], [-116.677, 51.177], [-116.573, 51.427]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["N.W.North-America", "W.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-01-22T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[-119.17677669529664, 51.32322330470336], [-119.53033008588991, 51.46966991411009], [-119.75, 52.0], [-119.53033008588991, 52.53033008588991], [-119.0, 52.75], [-118.5, 52.542893218813454], [-118.0, 52.75], [-117.75, 52.64644660940672], [-117.5, 52.75], [-117.25, 52.64644660940672], [-117.0, 52.75], [-116.46966991411009, 52.53033008588991], [-116.25, 52.0], [-116.42677669529664, 51.57322330470336], [-116.0, 51.75], [-115.46966991411009, 51.53033008588991], [-115.32322330470336, 51.17677669529664], [-115.25, 51.14644660940672], [-115.0, 51.25], [-114.46966991411009, 51.03033008588991], [-114.25, 50.5], [-114.46966991411009, 49.96966991411009], [-114.82322330470336, 49.82322330470336], [-114.96966991411009, 49.46966991411009], [-115.32322330470336, 49.32322330470336], [-115.35355339059328, 49.25], [-115.25, 49.0], [-115.46966991411009, 48.46966991411009], [-116.0, 48.25], [-116.25, 48.35355339059328], [-116.5, 48.25], [-116.75, 48.35355339059328], [-117.0, 48.25], [-117.25, 48.35355339059328], [-117.5, 48.25], [-117.75, 48.35355339059328], [-117.82322330470336, 48.32322330470336], [-117.96966991411009, 47.96966991411009], [-118.5, 47.75], [-119.03033008588991, 47.96966991411009], [-119.25, 48.5], [-119.14644660940672, 48.75], [-119.25, 49.0], [-119.14644660940672, 49.25], [-119.25, 49.5], [-119.14644660940672, 49.75], [-119.25, 50.0], [-119.04289321881345, 50.5], [-119.25, 51.0], [-119.14644660940672, 51.25], [-119.17677669529664, 51.32322330470336]], [[-116.82322330470336, 51.17677669529664], [-116.75, 51.14644660940672], [-116.67677669529664, 51.17677669529664], [-116.57322330470336, 51.42677669529664], [-116.875, 51.30177669529664], [-116.82322330470336, 51.17677669529664]]]}, "2021-01-23T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[-119.17677669529664, 51.32322330470336], [-119.53033008588991, 51.46966991411009], [-119.75, 52.0], [-119.53033008588991, 52.53033008588991], [-119.0, 52.75], [-118.5, 52.542893218813454], [-118.0, 52.75], [-117.75, 52.64644660940672], [-117.5, 52.75], [-117.25, 52.64644660940672], [-117.0, 52.75], [-116.46966991411009, 52.53033008588991], [-116.25, 52.0], [-116.42677669529664, 51.57322330470336], [-116.0, 51.75], [-115.46966991411009, 51.53033008588991], [-115.32322330470336, 51.17677669529664], [-115.25, 51.14644660940672], [-115.0, 51.25], [-114.46966991411009, 51.03033008588991], [-114.25, 50.5], [-114.46966991411009, 49.96966991411009], [-114.82322330470336, 49.82322330470336], [-114.96966991411009, 49.46966991411009], [-115.32322330470336, 49.32322330470336], [-115.35355339059328, 49.25], [-115.25, 49.0], [-115.46966991411009, 48.46966991411009], [-116.0, 48.25], [-116.25, 48.35355339059328], [-116.5, 48.25], [-116.75, 48.35355339059328], [-117.0, 48.25], [-117.25, 48.35355339059328], [-117.5, 48.25], [-117.75, 48.35355339059328], [-117.82322330470336, 48.32322330470336], [-117.96966991411009, 47.96966991411009], [-118.5, 47.75], [-119.03033008588991, 47.96966991411009], [-119.25, 48.5], [-119.14644660940672, 48.75], [-119.25, 49.0], [-119.14644660940672, 49.25], [-119.25, 49.5], [-119.14644660940672, 49.75], [-119.25, 50.0], [-119.04289321881345, 50.5], [-119.25, 51.0], [-119.14644660940672, 51.25], [-119.17677669529664, 51.32322330470336]], [[-116.82322330470336, 51.17677669529664], [-116.75, 51.14644660940672], [-116.67677669529664, 51.17677669529664], [-116.57322330470336, 51.42677669529664], [-116.875, 51.30177669529664], [-116.82322330470336, 51.17677669529664]]]}, "2021-01-24T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[-119.17677669529664, 51.32322330470336], [-119.53033008588991, 51.46966991411009], [-119.75, 52.0], [-119.53033008588991, 52.53033008588991], [-119.0, 52.75], [-118.5, 52.542893218813454], [-118.0, 52.75], [-117.75, 52.64644660940672], [-117.5, 52.75], [-117.25, 52.64644660940672], [-117.0, 52.75], [-116.46966991411009, 52.53033008588991], [-116.25, 52.0], [-116.42677669529664, 51.57322330470336], [-116.0, 51.75], [-115.46966991411009, 51.53033008588991], [-115.32322330470336, 51.17677669529664], [-115.25, 51.14644660940672], [-115.0, 51.25], [-114.46966991411009, 51.03033008588991], [-114.25, 50.5], [-114.46966991411009, 49.96966991411009], [-114.82322330470336, 49.82322330470336], [-114.96966991411009, 49.46966991411009], [-115.32322330470336, 49.32322330470336], [-115.35355339059328, 49.25], [-115.25, 49.0], [-115.46966991411009, 48.46966991411009], [-116.0, 48.25], [-116.25, 48.35355339059328], [-116.5, 48.25], [-116.75, 48.35355339059328], [-117.0, 48.25], [-117.25, 48.35355339059328], [-117.5, 48.25], [-117.75, 48.35355339059328], [-117.82322330470336, 48.32322330470336], [-117.96966991411009, 47.96966991411009], [-118.5, 47.75], [-119.03033008588991, 47.96966991411009], [-119.25, 48.5], [-119.14644660940672, 48.75], [-119.25, 49.0], [-119.14644660940672, 49.25], [-119.25, 49.5], [-119.14644660940672, 49.75], [-119.25, 50.0], [-119.04289321881345, 50.5], [-119.25, 51.0], [-119.14644660940672, 51.25], [-119.17677669529664, 51.32322330470336]], [[-116.82322330470336, 51.17677669529664], [-116.75, 51.14644660940672], [-116.67677669529664, 51.17677669529664], [-116.57322330470336, 51.42677669529664], [-116.875, 51.30177669529664], [-116.82322330470336, 51.17677669529664]]]}, "2021-01-25T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[-117.14644660940672, 49.75], [-117.25, 50.0], [-117.03033008588991, 50.53033008588991], [-116.5, 50.75], [-116.25, 50.64644660940672], [-116.0, 50.75], [-115.75, 50.64644660940672], [-115.5, 50.75], [-114.96966991411009, 50.53033008588991], [-114.75, 50.0], [-114.96966991411009, 49.46966991411009], [-115.32322330470336, 49.32322330470336], [-115.46966991411009, 48.96966991411009], [-116.0, 48.75], [-116.25, 48.85355339059328], [-116.5, 48.75], [-117.03033008588991, 48.96966991411009], [-117.25, 49.5], [-117.14644660940672, 49.75]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -12.328325200628768}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -8.135067472740726}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [-15.225434678485783, -16.84264601751113, -15.206577084094704, -14.733157713495132]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-21.557151933292403, -21.593364670121645, -22.756509515617353, -16.269059673607728]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-7.653727299956169, -9.284406744164952, -7.621933431359736, -7.081985083381733]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-9.786434064354978, -12.328325200628768, -9.327121054115366, -7.57585776426464]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.6620498707059765, -1.9883674904028552, -1.5876494452745238, -1.4072647435988075]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-2.244347012857783, -2.764385241626144, -2.0592215318876215, -1.437677581461378]}}