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Mason Neck, Virginia

Community in Fairfax County, Virginia

Air quality

The air at Mason Neck

Index 51, moderate, led by fine particles. Read at 12 PM from its reporting area, Northern Virginia and DC (DC), 20 miles off.

51Moderate
  • Fine particles (PM2.5)51Moderate20.4 mi
  • Ozone19Good16 ppb20.4 mi
  • Nitrogen dioxide3Good3.2 ppb20.4 mi
  • Carbon monoxide-0.4 ppm20.4 mi

The days ahead

Good each day through Sun Oct 18, led by fine particles. Yesterday measured 23, good.

Smoke, the next 45 hours

Little smoke near the ground through Sun 8 AM: the index from smoke stays at 11 or under.

FriSatSun

Precipitation

What has fallen at Mason Neck

0.10 in in the last 24 hours, and none in the 2 days before, to Fri 11 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.10in
Last 3 days
0.10in

Visibility

How far you can see at Mason Neck, the next 45 hours

Mist or haze: visibility falls to 1 miles Sat 3 AM.

FriSatSun

On the radar over Mason Neck, VirginiaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 5 instruments nearest Mason Neck, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.2 miles away.

measured now3 instruments

measured daily2 instruments

Lorton 2.3 SEVA-FX-132

In a volunteer observer's own ground/1.2 mi away/89 ft/46 ft above here

precip, snowfall, snow depth

Rank-

Dunn LoringDNLV2

At a cooperative observer's station/16.4 mi away/489 ft/446 ft above here

snowfall, snow depth, precip, high, low

Rank1,540of 1,541

Station report

The weather at Fort Belvoir/Daviso, drawn

The nearest airport reporting now, 3.6 mi from Mason Neck, Virginia. From its report of Oct 16, 2026, 11:55 AM local time: 3 of its 6 sheets.

The sky

Overcast at 800 ft; the ceiling is 800 ft; visibility 10 mi or more.

Section of the sky over Fort Belvoir/Daviso, height above the station to scale: overcast cloud with its base at 800 feet, the ceiling at 800 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DAAFIG. A THE SKY OVER FORT BELVOIR/DAVISOSECTION, 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 800 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 800 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEFort Belvoir/Daviso, the skySTATION REPORT · ASOS DAATYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-DAA-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

70.7 F with a dew point of 66.2 F, 86 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,000 ft up; the lowest cloud reported is at 800 ft.

Chart of the air at Fort Belvoir/Daviso: temperature 70.7 degrees Fahrenheit and dew point 66.2, 86 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,000 feet above the station, against the lowest cloud reported at 800 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DAAFIG. B THE AIR AT FORT BELVOIR/DAVISOTHE 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 F80 FSATURATES 1,000 FT ABOVE THE STATION, AT 65.1 FLOWEST CLOUD REPORTED, OVC 800 FTTEMPERATURE 70.7 FDEW POINT 66.2 FSPREAD 4.5 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 POINTTITLEFort Belvoir/Daviso, the airSTATION REPORT · ASOS DAATYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-DAA-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south southeast (160 degrees) at 8 mph: force 3, a gentle breeze on the Beaufort scale.

Plan of the wind at Fort Belvoir/Daviso, north up: blowing from 160 degrees, the south southeast, at 8 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 DAAFIG. C THE WIND AT FORT BELVOIR/DAVISOPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 160°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 8 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEFort Belvoir/Daviso, the windSTATION REPORT · ASOS DAATYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-DAA-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Fort Belvoir/Daviso, in 6 sheets, each beside the Field Book plates that explain it

0in

Snow on the ground

Measured at Dunn Loring (DNLV2), 16.4 miles from here, read 16 Oct, 07:00. measured daily

Elsewhere in Virginia

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

Near Mason Neck

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

Near Mason Neck

River and lake gauges