{"icao":"KTRI","name":"Tri-Cities Regional TN/VA Airport","lat":36.4752,"lon":-82.4074,"country":"US","tz":"America/New_York","updated":"2026-09-04T14:25Z","window":{"start":"2016-01-01","through":"2026-08-15"},"climatology":{"subCat1HoursPerYear":108,"bandDefinition":"visibility < ~800 m OR ceiling < 200 ft","fogSeasonPeakMonths":["September","October"],"monthlyHours":[9,6,3,4,8,7,8,13,16,14,9,13],"medianEventHours":2,"season":{"summary":"Fog season runs April through February, peaking in September; fog is mostly a 4 AM\u20138 AM phenomenon; typically thinning out by 9 AM; a typical event lasts about 2 hours (local time, 10-year average).","months":["January","February","April","May","June","July","August","September","October","November","December"],"timeOfDay":"4 AM\u20138 AM","typicallyClearsBy":"9 AM"}},"forecast":{"covered":true,"public":true,"cycle":"2026-09-04T13:00:00Z","peakPct":17,"peakAtLocal":"2026-09-05T07:00:00-04:00","wording":"No, fog is unlikely in the next 36 hours \u2014 the calibrated forecast peaks at just 17%. September typically brings about 16 hours of dense fog here."},"links":{"page":"https://fogatlas.org/fog/ktri/","liveForecastApi":"https://fogatlas.org/api/forecast","liveObservationsApi":"https://fogatlas.org/api/metar?ids=KTRI","hourlyClimatologyDetail":"https://fogatlas.org/data/detail/KTRI.json","verification":"https://fogatlas.org/fog/scorecard/","methodology":"https://fogatlas.org/#methodology"}}