{"version_information": {"version": "det_AHW_tail10.0_v1.1", "compiled_date": "2026-07-16 09:13:13.049588", "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": "2018-Jul-26_to_2018-Jul-31_256.0_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": 2018070001150}, "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": "July 26 2018"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "July 31 2018"}, "duration": {"name": "Duration", "description": "Time elapsed (days) from the start date to the end date", "value": 6}, "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": 173648.8385993146}, "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"]}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["C.North-America", "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": 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": 256.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "256.0\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 249.25}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 258.75}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 40.75}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 47.25}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2018-07-26T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-104.75, 43.5], [-104.53, 44.03], [-104.0, 44.25], [-103.75, 44.15], [-103.5, 44.25], [-102.97, 44.03], [-102.75, 43.5], [-102.97, 42.97], [-103.5, 42.75], [-103.75, 42.85], [-104.0, 42.75], [-104.53, 42.97], [-104.75, 43.5]]], [[[-108.97, 45.53], [-108.75, 45.0], [-108.85, 44.75], [-108.75, 44.5], [-108.97, 43.97], [-109.5, 43.75], [-110.03, 43.97], [-110.25, 44.5], [-110.15, 44.75], [-110.25, 45.0], [-110.03, 45.53], [-109.5, 45.75], [-108.97, 45.53]]], [[[-108.47, 47.53], [-108.32, 47.18], [-107.97, 47.03], [-107.8, 46.63], [-107.5, 46.75], [-107.25, 46.65], [-107.0, 46.75], [-106.75, 46.65], [-106.5, 46.75], [-105.97, 46.53], [-105.75, 46.0], [-105.97, 45.47], [-106.32, 45.32], [-106.46, 45.0], [-106.25, 44.5], [-106.35, 44.25], [-106.25, 44.0], [-106.35, 43.75], [-106.25, 43.5], [-106.47, 42.97], [-107.0, 42.75], [-107.53, 42.97], [-107.75, 43.5], [-107.65, 43.75], [-107.75, 44.0], [-107.65, 44.25], [-107.68, 44.32], [-108.03, 44.47], [-108.25, 45.0], [-108.04, 45.5], [-108.2, 45.88], [-108.5, 45.75], [-108.75, 45.85], [-109.0, 45.75], [-109.53, 45.97], [-109.75, 46.5], [-109.65, 46.75], [-109.75, 47.0], [-109.53, 47.53], [-109.0, 47.75], [-108.47, 47.53]]]]}, "2018-07-27T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-111.03, 47.03], [-110.5, 47.25], [-110.25, 47.15], [-110.0, 47.25], [-109.7, 47.13], [-109.53, 47.53], [-109.0, 47.75], [-108.47, 47.53], [-108.32, 47.18], [-107.97, 47.03], [-107.8, 46.63], [-107.5, 46.75], [-107.25, 46.65], [-107.0, 46.75], [-106.75, 46.65], [-106.5, 46.75], [-105.97, 46.53], [-105.75, 46.0], [-105.97, 45.47], [-106.32, 45.32], [-106.46, 45.0], [-106.32, 44.68], [-105.97, 44.53], [-105.82, 44.18], [-105.75, 44.15], [-105.5, 44.25], [-105.25, 44.15], [-105.18, 44.18], [-105.03, 44.53], [-104.68, 44.68], [-104.53, 45.03], [-104.0, 45.25], [-103.75, 45.15], [-103.5, 45.25], [-103.25, 45.15], [-103.0, 45.25], [-102.75, 45.15], [-102.5, 45.25], [-101.97, 45.03], [-101.82, 44.68], [-101.75, 44.65], [-101.5, 44.75], [-100.97, 44.53], [-100.75, 44.0], [-100.96, 43.5], [-100.75, 43.0], [-100.97, 42.47], [-101.5, 42.25], [-102.03, 42.47], [-102.18, 42.82], [-102.25, 42.85], [-102.5, 42.75], [-102.75, 42.85], [-102.82, 42.82], [-102.97, 42.47], [-103.32, 42.32], [-103.35, 42.25], [-103.25, 42.0], [-103.35, 41.75], [-103.25, 41.5], [-103.47, 40.97], [-104.0, 40.75], [-104.25, 40.85], [-104.5, 40.75], [-105.03, 40.97], [-105.25, 41.5], [-105.15, 41.75], [-105.18, 41.82], [-105.53, 41.97], [-105.68, 42.32], [-105.75, 42.35], [-106.0, 42.25], [-106.53, 42.47], [-106.7, 42.88], [-107.0, 42.75], [-107.53, 42.97], [-107.75, 43.5], [-107.65, 43.75], [-107.68, 43.82], [-108.03, 43.97], [-108.18, 44.32], [-108.25, 44.35], [-108.32, 44.32], [-108.47, 43.97], [-109.0, 43.75], [-109.25, 43.85], [-109.5, 43.75], [-110.03, 43.97], [-110.25, 44.5], [-110.15, 44.75], [-110.25, 45.0], [-110.15, 45.25], [-110.18, 45.32], [-110.25, 45.35], [-110.5, 45.25], [-111.03, 45.47], [-111.25, 46.0], [-111.15, 46.25], [-111.25, 46.5], [-111.03, 47.03]], [[-108.2, 45.88], [-108.37, 45.8], [-108.32, 45.68], [-108.25, 45.65], [-108.12, 45.7], [-108.2, 45.88]]]]}, "2018-07-28T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-111.03, 47.03], [-110.5, 47.25], [-110.25, 47.15], [-110.0, 47.25], [-109.7, 47.13], [-109.53, 47.53], [-109.0, 47.75], [-108.47, 47.53], [-108.32, 47.18], [-107.97, 47.03], [-107.8, 46.63], [-107.5, 46.75], [-107.25, 46.65], [-107.0, 46.75], [-106.75, 46.65], [-106.5, 46.75], [-105.97, 46.53], [-105.75, 46.0], [-105.97, 45.47], [-106.32, 45.32], [-106.46, 45.0], [-106.32, 44.68], [-106.25, 44.65], [-106.0, 44.75], [-105.75, 44.65], [-105.5, 44.75], [-105.25, 44.65], [-105.0, 44.75], [-104.75, 44.65], [-104.68, 44.68], [-104.53, 45.03], [-104.0, 45.25], [-103.75, 45.15], [-103.5, 45.25], [-103.25, 45.15], [-103.0, 45.25], [-102.75, 45.15], [-102.5, 45.25], [-101.97, 45.03], [-101.82, 44.68], [-101.75, 44.65], [-101.5, 44.75], [-100.97, 44.53], [-100.75, 44.0], [-100.96, 43.5], [-100.75, 43.0], [-100.97, 42.47], [-101.5, 42.25], [-101.75, 42.35], [-102.0, 42.25], [-102.5, 42.46], [-103.0, 42.25], [-103.25, 42.35], [-103.32, 42.32], [-103.35, 42.25], [-103.25, 42.0], [-103.35, 41.75], [-103.25, 41.5], [-103.47, 40.97], [-104.0, 40.75], [-104.25, 40.85], [-104.32, 40.82], [-104.47, 40.47], [-105.0, 40.25], [-105.53, 40.47], [-105.75, 41.0], [-105.65, 41.25], [-105.68, 41.32], [-106.03, 41.47], [-106.25, 42.0], [-106.15, 42.25], [-106.18, 42.32], [-106.25, 42.35], [-106.32, 42.32], [-106.47, 41.97], [-107.0, 41.75], [-107.53, 41.97], [-107.68, 42.32], [-108.03, 42.47], [-108.25, 43.0], [-108.07, 43.43], [-108.5, 43.25], [-108.75, 43.35], [-109.0, 43.25], [-109.53, 43.47], [-109.68, 43.82], [-110.03, 43.97], [-110.25, 44.5], [-110.15, 44.75], [-110.25, 45.0], [-110.15, 45.25], [-110.18, 45.32], [-110.25, 45.35], [-110.5, 45.25], [-111.03, 45.47], [-111.25, 46.0], [-111.15, 46.25], [-111.25, 46.5], [-111.03, 47.03]], [[-107.93, 43.57], [-107.68, 43.68], [-107.65, 43.75], [-107.68, 43.82], [-107.8, 43.88], [-107.93, 43.57]], [[-108.12, 45.7], [-108.2, 45.88], [-108.37, 45.8], [-108.32, 45.68], [-108.25, 45.65], [-108.12, 45.7]]]]}, "2018-07-29T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-111.03, 47.03], [-110.5, 47.25], [-110.25, 47.15], [-110.0, 47.25], [-109.47, 47.03], [-109.32, 46.68], [-108.97, 46.53], [-108.82, 46.18], [-108.47, 46.03], [-108.32, 45.68], [-108.25, 45.65], [-108.0, 45.75], [-107.75, 45.65], [-107.5, 45.75], [-106.97, 45.53], [-106.82, 45.18], [-106.47, 45.03], [-106.32, 44.68], [-106.25, 44.65], [-106.0, 44.75], [-105.75, 44.65], [-105.5, 44.75], [-105.25, 44.65], [-105.0, 44.75], [-104.75, 44.65], [-104.68, 44.68], [-104.53, 45.03], [-104.0, 45.25], [-103.75, 45.15], [-103.5, 45.25], [-103.25, 45.15], [-103.0, 45.25], [-102.75, 45.15], [-102.5, 45.25], [-101.97, 45.03], [-101.82, 44.68], [-101.75, 44.65], [-101.5, 44.75], [-100.97, 44.53], [-100.75, 44.0], [-100.96, 43.5], [-100.75, 43.0], [-100.97, 42.47], [-101.5, 42.25], [-101.75, 42.35], [-102.0, 42.25], [-102.5, 42.46], [-102.87, 42.3], [-102.75, 42.0], [-102.97, 41.47], [-103.32, 41.32], [-103.47, 40.97], [-104.0, 40.75], [-104.25, 40.85], [-104.32, 40.82], [-104.47, 40.47], [-105.0, 40.25], [-105.53, 40.47], [-105.75, 41.0], [-105.65, 41.25], [-105.68, 41.32], [-106.03, 41.47], [-106.25, 42.0], [-106.15, 42.25], [-106.18, 42.32], [-106.25, 42.35], [-106.32, 42.32], [-106.47, 41.97], [-107.0, 41.75], [-107.53, 41.97], [-107.68, 42.32], [-108.03, 42.47], [-108.25, 43.0], [-108.07, 43.43], [-108.5, 43.25], [-108.75, 43.35], [-109.0, 43.25], [-109.53, 43.47], [-109.68, 43.82], [-110.03, 43.97], [-110.25, 44.5], [-110.15, 44.75], [-110.25, 45.0], [-110.15, 45.25], [-110.18, 45.32], [-110.25, 45.35], [-110.5, 45.25], [-111.03, 45.47], [-111.25, 46.0], [-111.15, 46.25], [-111.25, 46.5], [-111.03, 47.03]], [[-107.93, 43.57], [-107.68, 43.68], [-107.65, 43.75], [-107.68, 43.82], [-107.8, 43.88], [-107.93, 43.57]]]]}, "2018-07-30T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-110.25, 44.5], [-110.03, 45.03], [-109.5, 45.25], [-108.97, 45.03], [-108.82, 44.68], [-108.75, 44.65], [-108.5, 44.75], [-108.2, 44.63], [-108.03, 45.03], [-107.5, 45.25], [-107.25, 45.15], [-107.0, 45.25], [-106.47, 45.03], [-106.32, 44.68], [-106.25, 44.65], [-106.0, 44.75], [-105.75, 44.65], [-105.5, 44.75], [-105.25, 44.65], [-105.0, 44.75], [-104.75, 44.65], [-104.68, 44.68], [-104.53, 45.03], [-104.0, 45.25], [-103.75, 45.15], [-103.5, 45.25], [-103.25, 45.15], [-103.0, 45.25], [-102.75, 45.15], [-102.5, 45.25], [-101.97, 45.03], [-101.82, 44.68], [-101.75, 44.65], [-101.5, 44.75], [-100.97, 44.53], [-100.75, 44.0], [-100.96, 43.5], [-100.75, 43.0], [-100.97, 42.47], [-101.5, 42.25], [-101.75, 42.35], [-102.0, 42.25], [-102.5, 42.46], [-102.87, 42.3], [-102.75, 42.0], [-102.97, 41.47], [-103.32, 41.32], [-103.47, 40.97], [-104.0, 40.75], [-104.25, 40.85], [-104.32, 40.82], [-104.47, 40.47], [-105.0, 40.25], [-105.53, 40.47], [-105.75, 41.0], [-105.65, 41.25], [-105.68, 41.32], [-106.03, 41.47], [-106.25, 42.0], [-106.15, 42.25], [-106.18, 42.32], [-106.25, 42.35], [-106.32, 42.32], [-106.47, 41.97], [-107.0, 41.75], [-107.53, 41.97], [-107.68, 42.32], [-108.03, 42.47], [-108.25, 43.0], [-108.07, 43.43], [-108.5, 43.25], [-108.75, 43.35], [-109.0, 43.25], [-109.53, 43.47], [-109.68, 43.82], [-110.03, 43.97], [-110.25, 44.5]], [[-107.68, 43.82], [-107.8, 43.88], [-107.93, 43.57], [-107.68, 43.68], [-107.65, 43.75], [-107.68, 43.82]]]]}, "2018-07-31T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[-104.53, 41.47], [-104.75, 42.0], [-104.53, 42.53], [-104.0, 42.75], [-103.75, 42.65], [-103.5, 42.75], [-102.97, 42.53], [-102.75, 42.0], [-102.97, 41.47], [-103.5, 41.25], [-103.75, 41.35], [-104.0, 41.25], [-104.53, 41.47]]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -7.001463709028258}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.214946264954415}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [16.294141651121265, 16.71873512142008, 16.188425996896513, 16.24799589379387, 15.994206713341384, 18.947391947918277]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [9.741161288624937, 9.994370168058651, 8.577099179953507, 9.138584047291886, 11.80068778202184, 18.63483203843333]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.3291450778612175, -4.914367975719717, -5.333955437089543, -5.056424682790994, -5.8302058351294, -4.078939349718354]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.203740851446582, -5.7813202830614046, -7.001463709028258, -6.705666829508004, -6.9086953511169895, -4.11055190327852]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4108724809094717, -1.5329644369380468, -1.6813665171272758, -1.6120834807369198, -1.8442855360299633, -1.407428982132034]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.57596417490949, -1.7607374121650137, -1.99423706680566, -1.854434137809966, -2.1205042808217134, -1.4329043069185712]}}