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Mountain Plains, South Dakota

Community in Lawrence County, South Dakota

Air quality

The air at Mountain Plains

Index 16, good, led by ozone. Read at 10 AM from its reporting area, Rapid City (SD), 40 miles off.

16Good
  • Fine particles (PM2.5)14Good-
  • Ozone16Good-
  • Coarse particles (PM10)6Good-

The days ahead

Yesterday measured 36, good.

Smoke, the next 45 hours

No smoke near the ground through Sun 6 AM.

FriSatSun

Precipitation

What has fallen at Mountain Plains

None in the last 24 hours; 0.08 in over the last 3 days, to Fri 9 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.08in

Visibility

How far you can see at Mountain Plains, the next 45 hours

Visibility stays 10 miles or more through Sun 6 AM.

FriSatSun

On the radar over Mountain Plains, South DakotaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Mountain Plains, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.7 miles away.

measured now4 instruments

Spearfish RAWSSFRS2

A remote fire weather station/2.4 mi away/4,253 ft/107 ft above here

temp, wind, gust, humidity, pressure

Rank384of 806

SpearfishSPF

At an airfield/4.2 mi away/3,892 ft/254 ft below here

temp, wind, gust, visibility, precip, pressure

Rank523of 806

SD RWIS SavoySD061

Beside a road/8.8 mi away/4,974 ft/828 ft above here

temp, pavement temp, wind, visibility, precip

Rank-

measured daily2 instruments

SpearfishSPES2

At a cooperative observer's station/3.2 mi away/3,517 ft/629 ft below here

snowfall, snow depth, precip, high, low

Rank711of 806

Station report

The weather at Spearfish, drawn

The nearest airport reporting now, 4.2 mi from Mountain Plains, South Dakota. From its report of Oct 16, 2026, 10:15 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 Spearfish, 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 SPFFIG. A THE SKY OVER SPEARFISHSECTION, 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 MORE0510TITLESpearfish, the skySTATION REPORT · ASOS SPFTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-SPF-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

44.6 F with a dew point of 19.4 F, 36 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 5,700 ft up.

Chart of the air at Spearfish: temperature 44.6 degrees Fahrenheit and dew point 19.4, 36 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 5,700 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SPFFIG. B THE AIR AT SPEARFISHTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,0007,0008,0000 F10 F20 F30 F40 F50 F60 FSATURATES 5,700 FT ABOVE THE STATION, AT 14.3 FTEMPERATURE 44.6 FDEW POINT 19.4 FSPREAD 25.2 FRELATIVE HUMIDITY 36 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 POINTTITLESpearfish, the airSTATION REPORT · ASOS SPFTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-SPF-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Spearfish, 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 SPFFIG. C THE WIND AT SPEARFISHPLAN, 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 FORCE73TITLESpearfish, the windSTATION REPORT · ASOS SPFTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-SPF-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Spearfish (SPES2), 3.2 miles from here, read 16 Oct, 08:56. measured daily

Elsewhere in South Dakota

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

Near Mountain Plains

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

Near Mountain Plains

River and lake gauges