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Cowan, Tennessee

City in Franklin County, Tennessee

Air quality

The air at Cowan

Index 72, moderate, led by fine particles. Read at 2 AM from its reporting area, Chattanooga (TN), 38 miles off.

72Moderate
  • Fine particles (PM2.5)72Moderate-
  • Ozone16Good-

The days ahead

Good each day through Sat Oct 17, led by fine particles. Yesterday measured 65, moderate.

Smoke, the next 41 hours

Little smoke near the ground through Sat 7 PM: the index from smoke stays at 22 or under.

FriSat

Precipitation

What has fallen at Cowan

None in the last 3 days, to Fri 2 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.00in

Visibility

How far you can see at Cowan, the next 41 hours

Visibility stays 10 miles or more through Sat 7 PM.

FriSat

On the radar over Cowan, TennesseeReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Cowan, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 3.3 miles away.

measured now4 instruments

measured daily2 instruments

Decherd 3.9 ENETN-FK-14

In a volunteer observer's own ground/3.8 mi away/1,037 ft/55 ft above here

precip, snowfall, snow depth

Rank-

Station report

The weather at Winchester, drawn

The nearest airport reporting now, 3.3 mi from Cowan, Tennessee. From its report of Oct 16, 2026, 2:55 AM local time: 3 of its 6 sheets.

The sky

No cloud below 12,000 ft; visibility 9 mi.

Section of the sky over Winchester, height above the station to scale: no cloud detected below 12,000 feet, the reach of its ceilometer, and visibility of 9 mi.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BGFFIG. A THE SKY OVER WINCHESTERSECTION, HEIGHT ABOVE THE STATION TO SCALE, EACH LAYER AT THE HEIGHT OF ITS BASE AS REPORTED; COVER IN EIGHTHS OF THE SKY; TOPS NOT MEASUREDFT ABOVE THE STATION05001,0001,5002,0002,5003,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETNO CLOUD DETECTED BELOW 12,000 FTVISIBILITY, MILES: 9 MI0510TITLEWinchester, the skySTATION REPORT · ASOS BGFTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-BGF-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

66.2 F with a dew point of 64.4 F, 94 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 400 ft up.

Chart of the air at Winchester: temperature 66.2 degrees Fahrenheit and dew point 64.4, 94 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 400 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BGFFIG. B THE AIR AT WINCHESTERTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00050 F60 F70 F80 FSATURATES 400 FT ABOVE THE STATION, AT 64.0 FTEMPERATURE AND DEW POINT 66.2 F, 64.4 FRELATIVE HUMIDITY 94 PER CENTTHE AIR COOLS ABOUT 5.4 F EACH 1,000 FT IT RISES, AND ITS DEW POINT ABOUT 1 FSOLID: THE LIFTED AIR'S TEMPERATURE; DASHED: ITS DEW POINTTITLEWinchester, the airSTATION REPORT · ASOS BGFTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-BGF-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Winchester, north up: calm; beside it the Beaufort scale from calm to hurricane force, force 0, calm, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BGFFIG. C THE WIND AT WINCHESTERPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEWinchester, the windSTATION REPORT · ASOS BGFTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-BGF-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Winchester, in 6 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at Winchester 1 E (WCHT1), 4.7 miles from here, read 15 Oct, 12:00. measured daily

Elsewhere in Tennessee

23 places, each with its own forecast and its own instruments.

Near Cowan

The nearest places, each with its own forecast and the instruments nearest it.

Near Cowan

River and lake gauges