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Big Arm, Montana

Community in Lake County, Montana

Air quality

The air at Big Arm

Index 29, good, led by fine particles. Read at 3 AM from its reporting area, Flathead Valley (MT), 39 miles off.

29Good
  • Fine particles (PM2.5)29Good-
  • Coarse particles (PM10)22Good-

The days ahead

Yesterday measured 33, good.

Smoke, the next 46 hours

Little smoke near the ground through Sun 12 AM: the index from smoke stays at 44 or under.

FriSat

Precipitation

What has fallen at Big Arm

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 Big Arm, the next 46 hours

Visibility stays 10 miles or more through Sun 12 AM.

FriSat

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

What is measuring near here

The 6 instruments nearest Big Arm, 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

Jette RAWSJETM8

A remote fire weather station/3.3 mi away/3,635 ft/614 ft above here

temp, wind, gust, humidity, pressure

Rank215of 1,053

measured daily2 instruments

Polson 1.0 SSEMT-LK-17

In a volunteer observer's own ground/10.6 mi away/3,370 ft/349 ft above here

precip, snowfall, snow depth

Rank-

Station report

The weather at Ronanairport, drawn

The nearest airport reporting now, 18.0 mi from Big Arm, Montana. From its report of Oct 16, 2026, 3:35 AM 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 Ronanairport, 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 7S0FIG. A THE SKY OVER RONANAIRPORTSECTION, 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 MORE0510TITLERonanairport, the skySTATION REPORT · ASOS 7S0TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-7S0-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

30.2 F with a dew point of 28.4 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 Ronanairport: temperature 30.2 degrees Fahrenheit and dew point 28.4, 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 7S0FIG. B THE AIR AT RONANAIRPORTTHE 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 28.0 FTEMPERATURE AND DEW POINT 30.2 F, 28.4 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 POINTTITLERonanairport, the airSTATION REPORT · ASOS 7S0TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-7S0-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Ronanairport, 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 7S0FIG. C THE WIND AT RONANAIRPORTPLAN, 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 FORCE73TITLERonanairport, the windSTATION REPORT · ASOS 7S0TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-7S0-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Polson Kerr Dam (KERM8), 8.5 miles from here, read 15 Oct, 18:00. measured daily

Elsewhere in Montana

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

Near Big Arm

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

Near Big Arm

River and lake gauges