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Bull Run, Virginia

Community in Fairfax County, Virginia

Air quality

The air at Bull Run

Index 34, good, led by fine particles. Read at 8 AM from its reporting area, Northern Virginia (VA), 4 miles off.

34Good
  • Fine particles (PM2.5)34Good12.8 mi
  • Ozone13Good8 ppb8.4 mi
  • Coarse particles (PM10)12Good12.8 mi
  • Nitrogen dioxide2Good2.6 ppb8.4 mi
  • Carbon monoxide-0.2 ppm22.7 mi

The days ahead

Good each day through Sun Oct 18, led by fine particles. Yesterday measured 28, good.

Smoke, the next 42 hours

Little smoke near the ground through Sun 2 AM: the index from smoke stays at 6 or under.

FriSat

Precipitation

What has fallen at Bull Run

0.06 in in the last 24 hours, and none in the 2 days before, to Fri 8 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.06in
Last 3 days
0.06in

Visibility

How far you can see at Bull Run, the next 42 hours

Visibility stays 7 miles or more through Sun 2 AM, lowest 8 miles Fri 9 AM.

FriSat

On the radar over Bull Run, VirginiaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 5 instruments nearest Bull Run, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.0 miles away.

measured now3 instruments

measured daily2 instruments

ManassasMNNV2

At a cooperative observer's station/7.5 mi away/256 ft/8 ft above here

snowfall, snow depth, precip, high, low

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Station report

The weather at Washington/Dulles, drawn

The nearest airport reporting now, 6.6 mi from Bull Run, Virginia. From its report of Oct 16, 2026, 8:39 AM local time: 3 of its 6 sheets.

The sky

Overcast at 500 ft; the ceiling is 500 ft; visibility 2 mi.

Section of the sky over Washington/Dulles, height above the station to scale: overcast cloud with its base at 500 feet, the ceiling at 500 feet, and visibility of 2 mi.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IADFIG. A THE SKY OVER WASHINGTON/DULLESSECTION, 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 SHEETOVC 500 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 500 FTVISIBILITY, MILES: 2 MI0510TITLEWashington/Dulles, the skySTATION REPORT · ASOS IADTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-IAD-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

63.0 F with a dew point of 62.0 F, 97 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 200 ft up; the lowest cloud reported is at 500 ft.

Chart of the air at Washington/Dulles: temperature 63.0 degrees Fahrenheit and dew point 62.0, 97 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 200 feet above the station, against the lowest cloud reported at 500 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IADFIG. B THE AIR AT WASHINGTON/DULLESTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00050 F60 F70 FSATURATES 200 FT ABOVE THE STATION, AT 61.7 FLOWEST CLOUD REPORTED, OVC 500 FTTEMPERATURE AND DEW POINT 63.0 F, 62.0 FRELATIVE HUMIDITY 97 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 POINTTITLEWashington/Dulles, the airSTATION REPORT · ASOS IADTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-IAD-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south southwest (200 degrees) at 9 mph: force 3, a gentle breeze on the Beaufort scale.

Plan of the wind at Washington/Dulles, north up: blowing from 200 degrees, the south southwest, at 9 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT IADFIG. C THE WIND AT WASHINGTON/DULLESPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 200°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 9 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEWashington/Dulles, the windSTATION REPORT · ASOS IADTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-IAD-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

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Snow on the ground

Elsewhere in Virginia

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

Near Bull Run

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

Near Bull Run

River and lake gauges