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Mammoth, Montana

Community in Madison County, Montana

Air quality

The air at Mammoth

Index 4, good, led by fine particles. Read at 11 PM from its reporting area, Dillon (MT), 44 miles off.

4Good
  • Fine particles (PM2.5)4Good-

The days ahead

Yesterday measured 21, good.

Smoke, the next 43 hours

No smoke near the ground through Sat 6 PM.

FriSat

Precipitation

What has fallen at Mammoth

None in the last 3 days, to Thu 11 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 Mammoth, the next 43 hours

Visibility stays 10 miles or more through Sat 6 PM.

FriSat

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

What is measuring near here

The 7 instruments nearest Mammoth, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 11.3 miles away.

measured now5 instruments

Twin BridgesRVF

At an airfield/16.5 mi away/4,756 ft/1,267 ft below here

temp, wind, gust, visibility, precip, pressure

Rank87of 1,053

measured daily2 instruments

Station report

The weather at Twin Bridges, drawn

The nearest airport reporting now, 16.5 mi from Mammoth, Montana. From its report of Oct 15, 2026, 11:55 PM local time: 3 of its 6 sheets.

The sky

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

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 9 mi.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: 9 MI0510TITLETwin 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

From the southwest (220 degrees) at 3 mph: force 1, a light air on the Beaufort scale.

Plan of the wind at Twin Bridges, north up: blowing from 220 degrees, the southwest, at 3 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 1, light air, 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 STATIONFROM 220°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT 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), 22.6 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 Mammoth

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

Near Mammoth

River and lake gauges