{"version_information": {"version": "det_AHW_v1.1", "compiled_date": "2026-03-19 18:11:54.853440", "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": "2020-Mar-25_to_2020-Mar-30_242.0_36.5"}, "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": 2020030000689}, "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": "March 25 2020"}, "end_date": {"name": "End date", "description": "Last date on which grid points are under the influence of an event", "value": "March 30 2020"}, "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": 128967.83648776548}, "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"]}, "continents_affected": {"name": "Continents affected", "description": "List of all continents affected", "value": ["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": 36.5}, "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": 242.0}, "center_latf": {"name": "Center latitude", "description": "Formatted version of center longitude", "value": "242.0\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": 242.0}, "southern_lat": {"name": "Southernmost latitude", "description": "Southernmost latitude affected by event", "value": 36.5}, "northern_lat": {"name": "Northernmost latitude", "description": "Northernmost latitude affected by event", "value": 42.5}, "polygons_merged": {"name": "Merged polygon", "description": "Merger or polygons at each time step", "value": {"type": "Polygon", "coordinates": [[[-117.25, 36.5], [-117.47, 35.97], [-118.0, 35.75], [-118.25, 35.854], [-118.5, 35.75], [-118.75, 35.854], [-119.0, 35.75], [-119.25, 35.854], [-119.5, 35.75], [-120.03, 35.97], [-120.25, 36.5], [-120.125, 36.802], [-120.53, 36.97], [-120.75, 37.5], [-120.97, 36.97], [-121.5, 36.75], [-121.75, 36.854], [-122.0, 36.75], [-122.53, 36.97], [-122.75, 37.5], [-122.646, 37.75], [-122.677, 37.823], [-123.03, 37.97], [-123.177, 38.323], [-123.53, 38.47], [-123.677, 38.823], [-124.03, 38.97], [-124.177, 39.323], [-124.53, 39.47], [-124.75, 40.0], [-124.53, 40.53], [-124.0, 40.75], [-123.47, 40.53], [-123.323, 40.177], [-122.97, 40.03], [-122.823, 39.677], [-122.573, 39.573], [-122.75, 40.0], [-122.646, 40.25], [-122.75, 40.5], [-122.53, 41.03], [-122.0, 41.25], [-121.75, 41.146], [-121.677, 41.177], [-121.53, 41.53], [-121.177, 41.677], [-121.043, 42.0], [-121.25, 42.5], [-121.03, 43.03], [-120.5, 43.25], [-119.97, 43.03], [-119.823, 42.677], [-119.75, 42.646], [-119.677, 42.677], [-119.53, 43.03], [-119.0, 43.25], [-118.47, 43.03], [-118.25, 42.5], [-118.457, 42.0], [-118.25, 41.5], [-118.47, 40.97], [-118.823, 40.823], [-118.854, 40.75], [-118.75, 40.5], [-118.97, 39.97], [-119.323, 39.823], [-119.354, 39.75], [-119.25, 39.5], [-119.354, 39.25], [-119.25, 39.0], [-119.375, 38.698], [-118.97, 38.53], [-118.823, 38.177], [-118.47, 38.03], [-118.323, 37.677], [-117.97, 37.53], [-117.823, 37.177], [-117.47, 37.03], [-117.25, 36.5]], [[-120.646, 37.749], [-120.646, 37.75], [-120.677, 37.823], [-120.75, 37.854], [-120.823, 37.823], [-120.854, 37.75], [-120.75, 37.5], [-120.646, 37.749]], [[-122.177, 39.323], [-122.427, 39.427], [-122.323, 39.177], [-122.25, 39.146], [-122.177, 39.177], [-122.146, 39.25], [-122.177, 39.323]]]}}, "IPCC_regions": {"name": "IPCC regions", "description": "List of all IPCC regions affected", "value": ["W.North-America"]}, "polygons": {"name": "Polygons", "description": "Polygon vertices describing the boundary of the event at each time step", "value": {"2020-03-25T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[-124.17677669529664, 39.32322330470336], [-124.53033008588991, 39.46966991411009], [-124.75, 40.0], [-124.53033008588991, 40.53033008588991], [-124.0, 40.75], [-123.46966991411009, 40.53033008588991], [-123.32322330470336, 40.17677669529664], [-122.96966991411009, 40.03033008588991], [-122.82322330470336, 39.67677669529664], [-122.57322330470336, 39.57322330470336], [-122.75, 40.0], [-122.64644660940672, 40.25], [-122.75, 40.5], [-122.53033008588991, 41.03033008588991], [-122.0, 41.25], [-121.75, 41.14644660940672], [-121.67677669529664, 41.17677669529664], [-121.53033008588991, 41.53033008588991], [-121.17677669529664, 41.67677669529664], [-121.04289321881345, 42.0], [-121.25, 42.5], [-121.03033008588991, 43.03033008588991], [-120.5, 43.25], [-119.96966991411009, 43.03033008588991], [-119.82322330470336, 42.67677669529664], [-119.75, 42.64644660940672], [-119.67677669529664, 42.67677669529664], [-119.53033008588991, 43.03033008588991], [-119.0, 43.25], [-118.46966991411009, 43.03033008588991], [-118.25, 42.5], [-118.45710678118655, 42.0], [-118.25, 41.5], [-118.46966991411009, 40.96966991411009], [-118.82322330470336, 40.82322330470336], [-118.85355339059328, 40.75], [-118.75, 40.5], [-118.96966991411009, 39.96966991411009], [-119.32322330470336, 39.82322330470336], [-119.35355339059328, 39.75], [-119.25, 39.5], [-119.35355339059328, 39.25], [-119.25, 39.0], [-119.45710678118655, 38.5], [-119.25, 38.0], [-119.46966991411009, 37.46966991411009], [-120.0, 37.25], [-120.53033008588991, 37.46966991411009], [-120.67677669529664, 37.82322330470336], [-120.75, 37.85355339059328], [-120.82322330470336, 37.82322330470336], [-120.85355339059328, 37.75], [-120.75, 37.5], [-120.96966991411009, 36.96966991411009], [-121.5, 36.75], [-121.75, 36.85355339059328], [-122.0, 36.75], [-122.53033008588991, 36.96966991411009], [-122.75, 37.5], [-122.64644660940672, 37.75], [-122.67677669529664, 37.82322330470336], [-123.03033008588991, 37.96966991411009], [-123.17677669529664, 38.32322330470336], [-123.53033008588991, 38.46966991411009], [-123.67677669529664, 38.82322330470336], [-124.03033008588991, 38.96966991411009], [-124.17677669529664, 39.32322330470336]], [[-122.25, 39.14644660940672], [-122.17677669529664, 39.17677669529664], [-122.14644660940672, 39.25], [-122.17677669529664, 39.32322330470336], [-122.42677669529664, 39.42677669529664], [-122.32322330470336, 39.17677669529664], [-122.25, 39.14644660940672]]]}, "2020-03-26T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[-124.17677669529664, 39.32322330470336], [-124.53033008588991, 39.46966991411009], [-124.75, 40.0], [-124.53033008588991, 40.53033008588991], [-124.0, 40.75], [-123.46966991411009, 40.53033008588991], [-123.32322330470336, 40.17677669529664], [-122.96966991411009, 40.03033008588991], [-122.82322330470336, 39.67677669529664], [-122.57322330470336, 39.57322330470336], [-122.75, 40.0], [-122.64644660940672, 40.25], [-122.75, 40.5], [-122.53033008588991, 41.03033008588991], [-122.0, 41.25], [-121.75, 41.14644660940672], [-121.67677669529664, 41.17677669529664], [-121.53033008588991, 41.53033008588991], [-121.17677669529664, 41.67677669529664], [-121.04289321881345, 42.0], [-121.25, 42.5], [-121.03033008588991, 43.03033008588991], [-120.5, 43.25], [-119.96966991411009, 43.03033008588991], [-119.82322330470336, 42.67677669529664], [-119.75, 42.64644660940672], [-119.67677669529664, 42.67677669529664], [-119.53033008588991, 43.03033008588991], [-119.0, 43.25], [-118.46966991411009, 43.03033008588991], [-118.25, 42.5], [-118.45710678118655, 42.0], [-118.25, 41.5], [-118.46966991411009, 40.96966991411009], [-118.82322330470336, 40.82322330470336], [-118.85355339059328, 40.75], [-118.75, 40.5], [-118.96966991411009, 39.96966991411009], [-119.32322330470336, 39.82322330470336], [-119.35355339059328, 39.75], [-119.25, 39.5], [-119.35355339059328, 39.25], [-119.25, 39.0], [-119.375, 38.69822330470336], [-118.96966991411009, 38.53033008588991], [-118.82322330470336, 38.17677669529664], [-118.46966991411009, 38.03033008588991], [-118.32322330470336, 37.67677669529664], [-117.96966991411009, 37.53033008588991], [-117.82322330470336, 37.17677669529664], [-117.46966991411009, 37.03033008588991], [-117.25, 36.5], [-117.46966991411009, 35.96966991411009], [-118.0, 35.75], [-118.25, 35.85355339059328], [-118.5, 35.75], [-118.75, 35.85355339059328], [-119.0, 35.75], [-119.25, 35.85355339059328], [-119.5, 35.75], [-120.03033008588991, 35.96966991411009], [-120.25, 36.5], [-120.125, 36.80177669529664], [-120.53033008588991, 36.96966991411009], [-120.75, 37.5], [-120.96966991411009, 36.96966991411009], [-121.5, 36.75], [-121.75, 36.85355339059328], [-122.0, 36.75], [-122.53033008588991, 36.96966991411009], [-122.75, 37.5], [-122.64644660940672, 37.75], [-122.67677669529664, 37.82322330470336], [-123.03033008588991, 37.96966991411009], [-123.17677669529664, 38.32322330470336], [-123.53033008588991, 38.46966991411009], [-123.67677669529664, 38.82322330470336], [-124.03033008588991, 38.96966991411009], [-124.17677669529664, 39.32322330470336]], [[-120.75, 37.5], [-120.64644660940672, 37.75], [-120.67677669529664, 37.82322330470336], [-120.75, 37.85355339059328], [-120.82322330470336, 37.82322330470336], [-120.85355339059328, 37.75], [-120.75, 37.5]], [[-122.25, 39.14644660940672], [-122.17677669529664, 39.17677669529664], [-122.14644660940672, 39.25], [-122.17677669529664, 39.32322330470336], [-122.42677669529664, 39.42677669529664], [-122.32322330470336, 39.17677669529664], [-122.25, 39.14644660940672]]]}, "2020-03-27T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[-124.17677669529664, 39.32322330470336], [-124.53033008588991, 39.46966991411009], [-124.75, 40.0], [-124.53033008588991, 40.53033008588991], [-124.0, 40.75], [-123.46966991411009, 40.53033008588991], [-123.32322330470336, 40.17677669529664], [-122.96966991411009, 40.03033008588991], [-122.82322330470336, 39.67677669529664], [-122.57322330470336, 39.57322330470336], [-122.75, 40.0], [-122.64644660940672, 40.25], [-122.75, 40.5], [-122.53033008588991, 41.03033008588991], [-122.0, 41.25], [-121.75, 41.14644660940672], [-121.67677669529664, 41.17677669529664], [-121.53033008588991, 41.53033008588991], [-121.17677669529664, 41.67677669529664], [-121.04289321881345, 42.0], [-121.25, 42.5], [-121.03033008588991, 43.03033008588991], [-120.5, 43.25], [-119.96966991411009, 43.03033008588991], [-119.82322330470336, 42.67677669529664], [-119.75, 42.64644660940672], [-119.67677669529664, 42.67677669529664], [-119.53033008588991, 43.03033008588991], [-119.0, 43.25], [-118.46966991411009, 43.03033008588991], [-118.25, 42.5], [-118.45710678118655, 42.0], [-118.25, 41.5], [-118.46966991411009, 40.96966991411009], [-118.82322330470336, 40.82322330470336], [-118.85355339059328, 40.75], [-118.75, 40.5], [-118.96966991411009, 39.96966991411009], [-119.32322330470336, 39.82322330470336], [-119.35355339059328, 39.75], [-119.25, 39.5], [-119.35355339059328, 39.25], [-119.25, 39.0], [-119.375, 38.69822330470336], [-118.96966991411009, 38.53033008588991], [-118.82322330470336, 38.17677669529664], [-118.46966991411009, 38.03033008588991], [-118.32322330470336, 37.67677669529664], [-117.96966991411009, 37.53033008588991], [-117.82322330470336, 37.17677669529664], [-117.46966991411009, 37.03033008588991], [-117.25, 36.5], [-117.46966991411009, 35.96966991411009], [-118.0, 35.75], [-118.25, 35.85355339059328], [-118.5, 35.75], [-118.75, 35.85355339059328], [-119.0, 35.75], [-119.25, 35.85355339059328], [-119.5, 35.75], [-120.03033008588991, 35.96966991411009], [-120.25, 36.5], [-120.125, 36.80177669529664], [-120.53033008588991, 36.96966991411009], [-120.75, 37.5], [-120.96966991411009, 36.96966991411009], [-121.5, 36.75], [-121.75, 36.85355339059328], [-122.0, 36.75], [-122.53033008588991, 36.96966991411009], [-122.75, 37.5], [-122.64644660940672, 37.75], [-122.67677669529664, 37.82322330470336], [-123.03033008588991, 37.96966991411009], [-123.17677669529664, 38.32322330470336], [-123.53033008588991, 38.46966991411009], [-123.67677669529664, 38.82322330470336], [-124.03033008588991, 38.96966991411009], [-124.17677669529664, 39.32322330470336]], [[-120.75, 37.5], [-120.64644660940672, 37.75], [-120.67677669529664, 37.82322330470336], [-120.75, 37.85355339059328], [-120.82322330470336, 37.82322330470336], [-120.85355339059328, 37.75], [-120.75, 37.5]], [[-122.25, 39.14644660940672], [-122.17677669529664, 39.17677669529664], [-122.14644660940672, 39.25], [-122.17677669529664, 39.32322330470336], [-122.42677669529664, 39.42677669529664], [-122.32322330470336, 39.17677669529664], [-122.25, 39.14644660940672]]]}, "2020-03-28T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[-120.64644660940672, 37.75], [-120.75, 38.0], [-120.53033008588991, 38.53033008588991], [-120.0, 38.75], [-119.75, 38.64644660940672], [-119.5, 38.75], [-118.96966991411009, 38.53033008588991], [-118.82322330470336, 38.17677669529664], [-118.46966991411009, 38.03033008588991], [-118.32322330470336, 37.67677669529664], [-117.96966991411009, 37.53033008588991], [-117.82322330470336, 37.17677669529664], [-117.46966991411009, 37.03033008588991], [-117.25, 36.5], [-117.46966991411009, 35.96966991411009], [-118.0, 35.75], [-118.25, 35.85355339059328], [-118.5, 35.75], [-118.75, 35.85355339059328], [-119.0, 35.75], [-119.25, 35.85355339059328], [-119.5, 35.75], [-120.03033008588991, 35.96966991411009], [-120.25, 36.5], [-120.125, 36.80177669529664], [-120.53033008588991, 36.96966991411009], [-120.75, 37.5], [-120.64644660940672, 37.75]]]}, "2020-03-29T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[-118.75, 36.5], [-118.53033008588991, 37.03033008588991], [-118.0, 37.25], [-117.46966991411009, 37.03033008588991], [-117.25, 36.5], [-117.46966991411009, 35.96966991411009], [-118.0, 35.75], [-118.53033008588991, 35.96966991411009], [-118.75, 36.5]]]}, "2020-03-30T11:30:00.000000000": {"type": "Polygon", "coordinates": [[[-118.75, 36.5], [-118.53033008588991, 37.03033008588991], [-118.0, 37.25], [-117.46966991411009, 37.03033008588991], [-117.25, 36.5], [-117.46966991411009, 35.96966991411009], [-118.0, 35.75], [-118.53033008588991, 35.96966991411009], [-118.75, 36.5]]]}}}, "max_amp": {"name": "Maximum anomaly amplitude", "description": "Maximum t2m anomaly recorded over entire duration", "value": -11.89573977524941}, "mean_amp": {"name": "Mean anomaly amplitude", "description": "Mean t2m anomaly over entire duration", "value": -5.942108852505272}, "evo_areamean": {"name": "Evolution of mean t2m", "description": "The daily evolution of mean t2m.", "value": [2.1251253403077044, -0.20858426593173363, 0.5084276542825137, -0.7929674443448107, 2.8485418047424105, 2.0907510705532673]}, "evo_maxamp": {"name": "Evolution of maximum t2m", "description": "The daily evolution of maximum t2m.", "value": [-4.445138411842265, -9.256242214171039, -10.203740098505875, -7.613151445968356, 2.8485418047424105, 2.0907510705532673]}, "anom_evo_areamean": {"name": "Evolution of mean t2m anomalies", "description": "The daily evolution of mean t2m anomalies.", "value": [-4.7844111689410855, -6.729752867566567, -6.198542439819477, -5.354910390644901, -5.987220351434587, -6.914687982587452]}, "anom_evo_maxamp": {"name": "Evolution of maximum t2m anomalies", "description": "The daily evolution of maximum t2m anomalies.", "value": [-6.98704639421544, -11.89573977524941, -10.005868719057844, -7.886134437847602, -5.987220351434587, -6.914687982587452]}, "anom_scaled_evo_areamean": {"name": "Evolution of mean standardized t2m anomalies", "description": "The daily evolution of mean standardized t2m anomalies.", "value": [-1.5293190865346638, -2.1030165619038064, -1.8993645227118807, -1.589439690802765, -1.5051333838917114, -1.7307337939390892]}, "anom_scaled_evo_maxamp": {"name": "Evolution of maximum standardized t2m anomalies", "description": "The daily evolution of maximum standardized t2m anomalies.", "value": [-1.9635502020814095, -2.918170687784368, -2.4810121721527745, -2.0137275553993703, -1.5051333838917114, -1.7307337939390892]}}