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Sinai, South Dakota

Town in Brookings County, South Dakota

Air quality

The air at Sinai

Index 26, good, led by fine particles. Read at 3 AM from its reporting area, Brookings (SD), 14 miles off.

26Good
  • Fine particles (PM2.5)26Good13.8 mi
  • Ozone17Good19 ppb13.8 mi
  • Coarse particles (PM10)7Good13.8 mi

The days ahead

Yesterday measured 32, good.

Smoke, the next 41 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Sinai

0.04 in in the last 24 hours, 0.12 in over the last 3 days, to Fri 2 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.04in
Last 3 days
0.12in

Visibility

How far you can see at Sinai, the next 41 hours

Visibility stays 10 miles or more through Sat 7 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Sinai, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 5.6 miles away.

measured now4 instruments

BrookingsBKX

At an airfield/12.0 mi away/1,609 ft/166 ft below here

temp, wind, gust, visibility, precip, pressure

Rank106of 806

measured daily2 instruments

Arlington 9.0 SSWSD-KY-10

In a volunteer observer's own ground/6.2 mi away/1,777 ft/2 ft above here

precip, snowfall, snow depth

Rank-

BrookingsBROS2

At a cooperative observer's station/14.7 mi away/1,650 ft/125 ft below here

snowfall, snow depth, precip, high, low

Rank736of 806

Station report

The weather at Brookings, drawn

The nearest airport reporting now, 12.0 mi from Sinai, South Dakota. From its report of Oct 16, 2026, 2:56 AM local time: 3 of its 6 sheets.

The sky

Broken at 2,100 ft, broken at 2,600 ft, overcast at 3,200 ft; the ceiling is 2,100 ft; visibility 10 mi or more.

Section of the sky over Brookings, height above the station to scale: broken cloud with its base at 2,100 feet, broken cloud with its base at 2,600 feet, overcast cloud with its base at 3,200 feet, the ceiling at 2,100 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BKXFIG. A THE SKY OVER BROOKINGSSECTION, 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 STATION01,0002,0003,0004,0005,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 3,200 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 2,600 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYBKN 2,100 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYCEILING 2,100 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEBrookings, the skySTATION REPORT · ASOS BKXTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-BKX-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

43.0 F with a dew point of 37.0 F, 79 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,400 ft up; the lowest cloud reported is at 2,100 ft.

Chart of the air at Brookings: temperature 43.0 degrees Fahrenheit and dew point 37.0, 79 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,400 feet above the station, against the lowest cloud reported at 2,100 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BKXFIG. B THE AIR AT BROOKINGSTHE 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 F50 FSATURATES 1,400 FT ABOVE THE STATION, AT 35.7 FLOWEST CLOUD REPORTED, BKN 2,100 FTTEMPERATURE 43.0 FDEW POINT 37.0 FSPREAD 6.0 FRELATIVE HUMIDITY 79 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 POINTTITLEBrookings, the airSTATION REPORT · ASOS BKXTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-BKX-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north northwest (340 degrees) at 24 mph, gusting 36 mph: force 5, a fresh breeze on the Beaufort scale. The strongest gust today was 41 mph.

Plan of the wind at Brookings, north up: blowing from 340 degrees, the north northwest, at 24 miles an hour, gusting 36; beside it the Beaufort scale from calm to hurricane force, force 5, fresh breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT BKXFIG. C THE WIND AT BROOKINGSPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 340°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE19NOW, 24 MPH6STRONG BREEZE257NEAR GALE32GUST, 36 MPH8GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEBrookings, the windSTATION REPORT · ASOS BKXTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-BKX-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Brookings (BROS2), 14.7 miles from here, read 15 Oct, 08:00. measured daily

Elsewhere in South Dakota

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

Near Sinai

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

Near Sinai

River and lake gauges