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Lake Barcroft, Virginia

Community in Fairfax County, Virginia

Air quality

The air at Lake Barcroft

Index 29, good, led by fine particles. Read at 11 PM from its reporting area, Northern Virginia and DC (DC), 9 miles off.

29Good
  • Fine particles (PM2.5)29Good18.4 mi
  • Ozone22Good11 ppb18.4 mi
  • Nitrogen dioxide4Good4.2 ppb20.4 mi
  • Sulfur dioxide0Good0 ppb20.4 mi
  • Carbon monoxide-0.1 ppm20.4 mi

The days ahead

Good each day through Sun Oct 18, led by fine particles. Yesterday measured 56, moderate.

Smoke, the next 46 hours

Little smoke near the ground through Sat 8 PM: the index from smoke stays at 6 or under.

FriSat

Precipitation

What has fallen at Lake Barcroft

0.02 in in the last 24 hours, and none in the 2 days before, to Thu 10 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.02in
Last 3 days
0.02in

Visibility

How far you can see at Lake Barcroft, the next 46 hours

Visibility stays 3 miles or more through Sat 8 PM, lowest 4 miles Fri 8 AM.

FriSat

On the radar over Lake Barcroft, VirginiaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 5 instruments nearest Lake Barcroft, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.9 miles away.

measured now3 instruments

measured daily2 instruments

Seven Corners 0.1 WNWVA-FX-130

In a volunteer observer's own ground/0.9 mi away/306 ft/47 ft above here

precip, snowfall, snow depth

Rank-

Dunn LoringDNLV2

At a cooperative observer's station/4.8 mi away/489 ft/230 ft above here

snowfall, snow depth, precip, high, low

Rank1,540of 1,541

Station report

The weather at Washington/National, drawn

The nearest airport reporting now, 6.3 mi from Lake Barcroft, Virginia. From its report of Oct 15, 2026, 10:52 PM local time: 3 of its 6 sheets.

The sky

Overcast at 2,000 ft; the ceiling is 2,000 ft; visibility 7 mi.

Section of the sky over Washington/National, height above the station to scale: overcast cloud with its base at 2,000 feet, the ceiling at 2,000 feet, and visibility of 7 mi.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DCAFIG. A THE SKY OVER WASHINGTON/NATIONALSECTION, 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 2,000 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 2,000 FTVISIBILITY, MILES: 7 MI0510TITLEWashington/National, the skySTATION REPORT · ASOS DCATYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-DCA-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

62.0 F with a dew point of 58.0 F, 87 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 900 ft up; the lowest cloud reported is at 2,000 ft.

Chart of the air at Washington/National: temperature 62.0 degrees Fahrenheit and dew point 58.0, 87 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, against the lowest cloud reported at 2,000 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DCAFIG. B THE AIR AT WASHINGTON/NATIONALTHE 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 900 FT ABOVE THE STATION, AT 57.0 FLOWEST CLOUD REPORTED, OVC 2,000 FTTEMPERATURE 62.0 FDEW POINT 58.0 FSPREAD 4.0 FRELATIVE HUMIDITY 87 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/National, the airSTATION REPORT · ASOS DCATYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-DCA-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the southeast (130 degrees) at 3 mph: force 1, a light air on the Beaufort scale. The strongest gust today was 21 mph.

Plan of the wind at Washington/National, north up: blowing from 130 degrees, the southeast, 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 DCAFIG. C THE WIND AT WASHINGTON/NATIONALPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 130°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEWashington/National, the windSTATION REPORT · ASOS DCATYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-DCA-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Dunn Loring (DNLV2), 4.8 miles from here, read 15 Oct, 08:00. measured daily

Elsewhere in Virginia

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

Near Lake Barcroft

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

Near Lake Barcroft

River and lake gauges