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Harrison, Montana

Community in Madison County, Montana

Air quality

The air at Harrison

Index 9, good, led by fine particles. Read at 10 PM from its reporting area, Dillon (MT), 54 miles off.

9Good
  • Fine particles (PM2.5)9Good-

The days ahead

Yesterday measured 21, good.

Smoke, the next 44 hours

No smoke near the ground through Sat 6 PM.

FriSat

Precipitation

What has fallen at Harrison

None in the last 3 days, to Thu 9 PM. 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 Harrison, the next 44 hours

Visibility stays 10 miles or more through Sat 6 PM.

FriSat

On the radar over Harrison, MontanaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 7 instruments nearest Harrison, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.0 miles away.

measured now5 instruments

measured daily2 instruments

Station report

The weather at Twin Bridges, drawn

The nearest airport reporting now, 27.5 mi from Harrison, Montana. From its report of Oct 15, 2026, 10:55 PM local time: 3 of its 6 sheets.

The sky

No cloud below 12,000 ft; visibility 10 mi or more.

Section of the sky over Twin Bridges, height above the station to scale: no cloud detected below 12,000 feet, the reach of its ceilometer, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RVFFIG. A THE SKY OVER TWIN BRIDGESSECTION, 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: 10 MI OR MORE0510TITLETwin Bridges, the skySTATION REPORT · ASOS RVFTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-RVF-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

33.8 F with a dew point of 32.0 F, 93 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 Twin Bridges: temperature 33.8 degrees Fahrenheit and dew point 32.0, 93 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 RVFFIG. B THE AIR AT TWIN BRIDGESTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00020 F30 F40 FSATURATES 400 FT ABOVE THE STATION, AT 31.6 FTEMPERATURE AND DEW POINT 33.8 F, 32.0 FRELATIVE HUMIDITY 93 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 POINTTITLETwin Bridges, the airSTATION REPORT · ASOS RVFTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-RVF-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 Twin Bridges, 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 RVFFIG. C THE WIND AT TWIN BRIDGESPLAN, 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 FORCE73TITLETwin Bridges, the windSTATION REPORT · ASOS RVFTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-RVF-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Madison River 6 NE McAllister below Ennis Lake (MADM8), 16.7 miles from here, read 15 Oct, 15:30. measured daily

Elsewhere in Montana

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

Near Harrison

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

Near Harrison

River and lake gauges