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Long Lake, South Dakota

Town in McPherson County, South Dakota

Air quality

The air at Long Lake

Index 10, good, led by coarse particles. Read at 11 PM from its reporting area, Aberdeen (SD), 44 miles off.

10Good
  • Fine particles (PM2.5)5Good-
  • Coarse particles (PM10)10Good-

The days ahead

Yesterday measured 18, good.

Smoke, the next 44 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Long Lake

0.03 in in the last 24 hours, and none in the 2 days before, to Thu 11 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.03in
Last 3 days
0.03in

Visibility

How far you can see at Long Lake, the next 44 hours

Visibility stays 9 miles or more through Sat 7 PM, lowest 9 miles Fri 7 AM.

FriSat

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

What is measuring near here

The 6 instruments nearest Long Lake, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 3.0 miles away.

measured now4 instruments

Sand Lake RAWSLLKS2

A remote fire weather station/9.8 mi away/2,011 ft/55 ft above here

temp, wind, gust, humidity, pressure

Rank172of 806

measured daily2 instruments

LeolaABNS2

At a cooperative observer's station/10.8 mi away/1,939 ft/17 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Sd RWIS Eureka, drawn

The nearest instrument reporting now, 9.8 mi from Long Lake, South Dakota. From its report of Oct 15, 2026, 11:25 PM local time: 3 of its 5 sheets.

The air

40.8 F with a dew point of 36.9 F, 86 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 900 ft up.

Chart of the air at Sd RWIS Eureka: temperature 40.8 degrees Fahrenheit and dew point 36.9, 86 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 900 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SD524FIG. B THE AIR AT SD RWIS EUREKATHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00030 F40 F50 FSATURATES 900 FT ABOVE THE STATION, AT 36.1 FTEMPERATURE 40.8 FDEW POINT 36.9 FSPREAD 3.9 FRELATIVE HUMIDITY 86 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 POINTTITLESd RWIS Eureka, the airSTATION REPORT · RWIS SD524TYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 5DATE2026-10-16IDSR-SD524-1DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north (359 degrees) at 28 mph, gusting 42 mph: force 6, a strong breeze on the Beaufort scale. The strongest gust today was 55 mph.

Plan of the wind at Sd RWIS Eureka, north up: blowing from 359 degrees, the north, at 28 miles an hour, gusting 42; beside it the Beaufort scale from calm to hurricane force, force 6, strong breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SD524FIG. C THE WIND AT SD RWIS EUREKAPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 359°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE25NOW, 28 MPH7NEAR GALE328GALE39GUST, 42 MPH9STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLESd RWIS Eureka, the windSTATION REPORT · RWIS SD524TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 2 of 5DATE2026-10-16IDSR-SD524-2DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008

The column

At 1,942 ft above sea level, 7 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 27.88 inHg and the temperature at 52.1 F; it reports 40.8 F, 11.3 F colder than standard.

Section from sea level of where Sd RWIS Eureka stands in the atmosphere, height to scale: the station 1,942 feet above sea level with 7 per cent of the air below it; the standard atmosphere's pressure there, 27.88 inches of mercury, and temperature, 52.1 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SD524FIG. D WHERE SD RWIS EUREKA STANDS IN THE ATMOSPHERESECTION FROM SEA LEVEL, HEIGHT TO SCALE, THE STATION IN THE STANDARD ATMOSPHEREFT ABOVE SEA LEVEL05,00010,00015,000SEA LEVEL, 29.92 inHg IN THE STANDARD ATMOSPHERESD RWIS EUREKA7 PER CENT OF THE AIR BELOW IT1,942 FT10 PER CENT OF THE AIR BELOW, 2,890 FT20 PER CENT OF THE AIR BELOW, 6,050 FT30 PER CENT OF THE AIR BELOW, 9,540 FT40 PER CENT OF THE AIR BELOW, 13,470 FTSTANDARD PRESSURE HERE27.88 inHgSTANDARD TEMPERATURE HERE52.1 FTEMPERATURE, REPORTED40.8 FTITLESd RWIS Eureka, the columnSTATION REPORT · RWIS SD524TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 3 of 5DATE2026-10-16IDSR-SD524-3DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The full report of Sd RWIS Eureka, in 5 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in South Dakota

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

Near Long Lake

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

Near Long Lake

River and lake gauges