{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-03-19 18:21:49.457094", "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-18_to_2021-Jan-21_170.5_-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": 2021010000707}, "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 18 2021"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "January 21 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": 156757.78499151103}, "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": ["New Zealand"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["Oceania"]}, "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": ["Tasman Sea"]}, "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": 170.5}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "170.5\u00b0E"}, "western_lon": {"name": "Westernmost longitude", "description": "Westernmost longitude affected by event", "value": 168.0}, "eastern_lon": {"name": "Easternmost longitude", "description": "Easternmost longitude affected by event", "value": 173.5}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": -45.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": -37.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "Polygon", "coordinates": [[[168.751, -43.854], [168.78, -43.842], [168.823, -43.823], [168.97, -43.47], [169.323, -43.323], [169.47, -42.97], [170.0, -42.75], [170.25, -42.854], [170.274, -42.844], [170.323, -42.823], [170.47, -42.47], [170.823, -42.323], [170.854, -42.25], [170.75, -42.0], [170.875, -41.698], [170.75, -41.646], [170.5, -41.75], [170.25, -41.646], [170.0, -41.75], [169.75, -41.646], [169.5, -41.75], [168.97, -41.53], [168.823, -41.177], [168.47, -41.03], [168.25, -40.5], [168.457, -40.0], [168.25, -39.5], [168.457, -39.0], [168.25, -38.5], [168.354, -38.25], [168.25, -38.0], [168.47, -37.47], [168.823, -37.323], [168.97, -36.97], [169.5, -36.75], [170.03, -36.97], [170.177, -37.323], [170.25, -37.354], [170.5, -37.25], [171.03, -37.47], [171.177, -37.823], [171.53, -37.97], [171.677, -38.323], [172.03, -38.47], [172.177, -38.823], [172.53, -38.97], [172.677, -39.323], [172.75, -39.354], [173.0, -39.25], [173.53, -39.47], [173.75, -40.0], [173.646, -40.25], [173.75, -40.5], [173.646, -40.75], [173.677, -40.823], [174.03, -40.97], [174.25, -41.5], [174.03, -42.03], [173.677, -42.177], [173.53, -42.53], [173.0, -42.75], [172.75, -42.646], [172.677, -42.677], [172.53, -43.03], [172.0, -43.25], [171.75, -43.146], [171.677, -43.177], [171.53, -43.53], [171.177, -43.677], [171.03, -44.03], [170.677, -44.177], [170.53, -44.53], [170.0, -44.75], [169.75, -44.646], [169.677, -44.677], [169.658, -44.72], [169.646, -44.749], [169.646, -44.75], [169.75, -45.0], [169.53, -45.53], [169.177, -45.677], [169.03, -46.03], [168.5, -46.25], [167.97, -46.03], [167.823, -45.677], [167.47, -45.53], [167.25, -45.0], [167.47, -44.47], [167.823, -44.323], [167.97, -43.97], [168.5, -43.75], [168.75, -43.854], [168.751, -43.854]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["New-Zealand"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2021-01-18T11:30:00.000000000": {"type": "MultiPolygon", "coordinates": [[[[167.96966991411009, -43.96966991411009], [168.5, -43.75], [168.75, -43.85355339059328], [169.0, -43.75], [169.53033008588991, -43.96966991411009], [169.75, -44.5], [169.64644660940672, -44.75], [169.75, -45.0], [169.53033008588991, -45.53033008588991], [169.0, -45.75], [168.75, -45.64644660940672], [168.5, -45.75], [168.25, -45.64644660940672], [168.0, -45.75], [167.46966991411009, -45.53033008588991], [167.25, -45.0], [167.46966991411009, -44.46966991411009], [167.82322330470336, -44.32322330470336], [167.96966991411009, -43.96966991411009]]], [[[171.03033008588991, -44.03033008588991], [170.5, -44.25], [169.96966991411009, -44.03033008588991], [169.75, -43.5], [169.96966991411009, -42.96966991411009], [170.5, -42.75], [171.03033008588991, -42.96966991411009], [171.25, -43.5], [171.03033008588991, -44.03033008588991]]]]}, "2021-01-19T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[167.82322330470336, -45.67677669529664], [167.46966991411009, -45.53033008588991], [167.25, -45.0], [167.46966991411009, -44.46966991411009], [167.82322330470336, -44.32322330470336], [167.96966991411009, -43.96966991411009], [168.5, -43.75], [168.75, -43.85355339059328], [168.82322330470336, -43.82322330470336], [168.96966991411009, -43.46966991411009], [169.32322330470336, -43.32322330470336], [169.46966991411009, -42.96966991411009], [170.0, -42.75], [170.25, -42.85355339059328], [170.32322330470336, -42.82322330470336], [170.46966991411009, -42.46966991411009], [170.82322330470336, -42.32322330470336], [170.85355339059328, -42.25], [170.75, -42.0], [170.875, -41.69822330470336], [170.75, -41.64644660940672], [170.5, -41.75], [170.25, -41.64644660940672], [170.0, -41.75], [169.75, -41.64644660940672], [169.5, -41.75], [168.96966991411009, -41.53033008588991], [168.82322330470336, -41.17677669529664], [168.46966991411009, -41.03033008588991], [168.25, -40.5], [168.45710678118655, -40.0], [168.25, -39.5], [168.45710678118655, -39.0], [168.25, -38.5], [168.35355339059328, -38.25], [168.25, -38.0], [168.46966991411009, -37.46966991411009], [168.82322330470336, -37.32322330470336], [168.96966991411009, -36.96966991411009], [169.5, -36.75], [170.03033008588991, -36.96966991411009], [170.17677669529664, -37.32322330470336], [170.25, -37.35355339059328], [170.5, -37.25], [171.03033008588991, -37.46966991411009], [171.17677669529664, -37.82322330470336], [171.53033008588991, -37.96966991411009], [171.67677669529664, -38.32322330470336], [172.03033008588991, -38.46966991411009], [172.17677669529664, -38.82322330470336], [172.53033008588991, -38.96966991411009], [172.67677669529664, -39.32322330470336], [172.75, -39.35355339059328], [173.0, -39.25], [173.53033008588991, -39.46966991411009], [173.75, -40.0], [173.64644660940672, -40.25], [173.75, -40.5], [173.64644660940672, -40.75], [173.67677669529664, -40.82322330470336], [174.03033008588991, -40.96966991411009], [174.25, -41.5], [174.03033008588991, -42.03033008588991], [173.67677669529664, -42.17677669529664], [173.53033008588991, -42.53033008588991], [173.0, -42.75], [172.75, -42.64644660940672], [172.67677669529664, -42.67677669529664], [172.53033008588991, -43.03033008588991], [172.0, -43.25], [171.75, -43.14644660940672], [171.67677669529664, -43.17677669529664], [171.53033008588991, -43.53033008588991], [171.17677669529664, -43.67677669529664], [171.03033008588991, -44.03033008588991], [170.67677669529664, -44.17677669529664], [170.53033008588991, -44.53033008588991], [170.0, -44.75], [169.75, -44.64644660940672], [169.67677669529664, -44.67677669529664], [169.64644660940672, -44.75], [169.75, -45.0], [169.53033008588991, -45.53033008588991], [169.17677669529664, -45.67677669529664], [169.03033008588991, -46.03033008588991], [168.5, -46.25], [167.96966991411009, -46.03033008588991], [167.82322330470336, -45.67677669529664]]]}, "2021-01-20T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[167.82322330470336, -45.67677669529664], [167.46966991411009, -45.53033008588991], [167.25, -45.0], [167.46966991411009, -44.46966991411009], [167.82322330470336, -44.32322330470336], [167.96966991411009, -43.96966991411009], [168.5, -43.75], [168.75, -43.85355339059328], [168.82322330470336, -43.82322330470336], [168.96966991411009, -43.46966991411009], [169.32322330470336, -43.32322330470336], [169.46966991411009, -42.96966991411009], [170.0, -42.75], [170.25, -42.85355339059328], [170.32322330470336, -42.82322330470336], [170.46966991411009, -42.46966991411009], [170.82322330470336, -42.32322330470336], [170.85355339059328, -42.25], [170.75, -42.0], [170.875, -41.69822330470336], [170.75, -41.64644660940672], [170.5, -41.75], [170.25, -41.64644660940672], [170.0, -41.75], [169.75, -41.64644660940672], [169.5, -41.75], [168.96966991411009, -41.53033008588991], [168.82322330470336, -41.17677669529664], [168.46966991411009, -41.03033008588991], [168.25, -40.5], [168.45710678118655, -40.0], [168.25, -39.5], [168.45710678118655, -39.0], [168.25, -38.5], [168.35355339059328, -38.25], [168.25, -38.0], [168.46966991411009, -37.46966991411009], [168.82322330470336, -37.32322330470336], [168.96966991411009, -36.96966991411009], [169.5, -36.75], [170.03033008588991, -36.96966991411009], [170.17677669529664, -37.32322330470336], [170.25, -37.35355339059328], [170.5, -37.25], [171.03033008588991, -37.46966991411009], [171.17677669529664, -37.82322330470336], [171.53033008588991, -37.96966991411009], [171.67677669529664, -38.32322330470336], [172.03033008588991, -38.46966991411009], [172.17677669529664, -38.82322330470336], [172.53033008588991, -38.96966991411009], [172.67677669529664, -39.32322330470336], [172.75, -39.35355339059328], [173.0, -39.25], [173.53033008588991, -39.46966991411009], [173.75, -40.0], [173.64644660940672, -40.25], [173.75, -40.5], [173.64644660940672, -40.75], [173.67677669529664, -40.82322330470336], [174.03033008588991, -40.96966991411009], [174.25, -41.5], [174.03033008588991, -42.03033008588991], [173.67677669529664, -42.17677669529664], [173.53033008588991, -42.53033008588991], [173.0, -42.75], [172.75, -42.64644660940672], [172.67677669529664, -42.67677669529664], [172.53033008588991, -43.03033008588991], [172.0, -43.25], [171.75, -43.14644660940672], [171.67677669529664, -43.17677669529664], [171.53033008588991, -43.53033008588991], [171.17677669529664, -43.67677669529664], [171.03033008588991, -44.03033008588991], [170.67677669529664, -44.17677669529664], [170.53033008588991, -44.53033008588991], [170.0, -44.75], [169.75, -44.64644660940672], [169.67677669529664, -44.67677669529664], [169.64644660940672, -44.75], [169.75, -45.0], [169.53033008588991, -45.53033008588991], [169.17677669529664, -45.67677669529664], [169.03033008588991, -46.03033008588991], [168.5, -46.25], [167.96966991411009, -46.03033008588991], [167.82322330470336, -45.67677669529664]]]}, "2021-01-21T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[167.85355339059328, -45.25], [167.75, -45.0], [167.85355339059328, -44.75], [167.75, -44.5], [167.96966991411009, -43.96966991411009], [168.5, -43.75], [168.80177669529664, -43.875], [168.96966991411009, -43.46966991411009], [169.32322330470336, -43.32322330470336], [169.46966991411009, -42.96966991411009], [170.0, -42.75], [170.25, -42.85355339059328], [170.32322330470336, -42.82322330470336], [170.46966991411009, -42.46966991411009], [170.82322330470336, -42.32322330470336], [170.85355339059328, -42.25], [170.75, -42.0], [170.875, -41.69822330470336], [170.75, -41.64644660940672], [170.5, -41.75], [170.25, -41.64644660940672], [170.0, -41.75], [169.75, -41.64644660940672], [169.5, -41.75], [168.96966991411009, -41.53033008588991], [168.82322330470336, -41.17677669529664], [168.46966991411009, -41.03033008588991], [168.25, -40.5], [168.45710678118655, -40.0], [168.25, -39.5], [168.45710678118655, -39.0], [168.25, -38.5], [168.35355339059328, -38.25], [168.25, -38.0], [168.46966991411009, -37.46966991411009], [168.82322330470336, -37.32322330470336], [168.96966991411009, -36.96966991411009], [169.5, -36.75], [170.03033008588991, -36.96966991411009], [170.17677669529664, -37.32322330470336], [170.25, -37.35355339059328], [170.5, -37.25], [171.03033008588991, -37.46966991411009], [171.17677669529664, -37.82322330470336], [171.53033008588991, -37.96966991411009], [171.67677669529664, -38.32322330470336], [172.03033008588991, -38.46966991411009], [172.17677669529664, -38.82322330470336], [172.53033008588991, -38.96966991411009], [172.67677669529664, -39.32322330470336], [172.75, -39.35355339059328], [173.0, -39.25], [173.53033008588991, -39.46966991411009], [173.75, -40.0], [173.64644660940672, -40.25], [173.75, -40.5], [173.64644660940672, -40.75], [173.67677669529664, -40.82322330470336], [174.03033008588991, -40.96966991411009], [174.25, -41.5], [174.03033008588991, -42.03033008588991], [173.67677669529664, -42.17677669529664], [173.53033008588991, -42.53033008588991], [173.0, -42.75], [172.75, -42.64644660940672], [172.67677669529664, -42.67677669529664], [172.53033008588991, -43.03033008588991], [172.0, -43.25], [171.75, -43.14644660940672], [171.67677669529664, -43.17677669529664], [171.53033008588991, -43.53033008588991], [171.17677669529664, -43.67677669529664], [171.03033008588991, -44.03033008588991], [170.67677669529664, -44.17677669529664], [170.53033008588991, -44.53033008588991], [170.0, -44.75], [169.75, -44.64644660940672], [169.625, -44.69822330470336], [169.75, -45.0], [169.53033008588991, -45.53033008588991], [169.17677669529664, -45.67677669529664], [169.03033008588991, -46.03033008588991], [168.5, -46.25], [167.96966991411009, -46.03033008588991], [167.75, -45.5], [167.85355339059328, -45.25]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -8.26182111603373}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -3.491877665100793}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [6.04179566463398, 12.097316671813019, 11.487744164727474, 13.60471224460639]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [4.4116487947555925, 0.5448720328666354, 1.8192712181269144, 3.1291946851435455]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.492582322440512, -3.6272096820545934, -4.313808175840768, -2.412788168185088]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-5.008169923832384, -8.07787342759974, -8.26182111603373, -5.731388071675212]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.4690129112262962, -2.0748241849137883, -2.6847229169204936, -1.4456668500111058]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.5388278455852848, -2.789063639597825, -3.0629422879250328, -2.0069023847274483]}}