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Roy, Washington

City in Pierce County, Washington

Air quality

The air at Roy

Index 53, moderate, led by fine particles. Read at 12 AM from its reporting area, Olympia-Lacey-Tumwater (WA), 14 miles off.

53Moderate
  • Fine particles (PM2.5)53Moderate-
  • Ozone0Good-

The days ahead

Good each day through Mon Oct 19, led by fine particles. Yesterday measured 20, good.

Smoke, the next 41 hours

Little smoke near the ground through Sat 5 PM: the index from smoke stays at 50 or under.

FriSat

Precipitation

What has fallen at Roy

None in the last 24 hours; 0.02 in over the last 3 days, to Thu 11 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.02in

Visibility

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

Visibility stays 5 miles or more through Sat 5 PM, lowest 5 miles Fri 4 AM.

FriSat

On the radar over Roy, WashingtonReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Roy, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 6.5 miles away.

measured now4 instruments

measured daily2 instruments

Roy 7.2 EWA-PR-23

In a volunteer observer's own ground/7.1 mi away/578 ft/214 ft above here

precip, snowfall, snow depth

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Station report

The weather at Fort Lewis/Gray AAF, drawn

The nearest airport reporting now, 6.5 mi from Roy, Washington. From its report of Oct 15, 2026, 11:55 PM local time: 3 of its 6 sheets.

The sky

No cloud below 12,000 ft; visibility 10 mi or more.

Section of the sky over Fort Lewis/Gray AAF, height above the station to scale: no cloud detected below 12,000 feet, the reach of its ceilometer, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT GRFFIG. A THE SKY OVER FORT LEWIS/GRAY AAFSECTION, 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 SHEETNO CLOUD DETECTED BELOW 12,000 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEFort Lewis/Gray AAF, the skySTATION REPORT · ASOS GRFTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-GRF-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

44.4 F with a dew point of 42.4 F, 93 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 500 ft up.

Chart of the air at Fort Lewis/Gray AAF: temperature 44.4 degrees Fahrenheit and dew point 42.4, 93 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 500 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT GRFFIG. B THE AIR AT FORT LEWIS/GRAY AAFTHE 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 F60 FSATURATES 500 FT ABOVE THE STATION, AT 41.9 FTEMPERATURE AND DEW POINT 44.4 F, 42.4 FRELATIVE HUMIDITY 93 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 Lewis/Gray AAF, the airSTATION REPORT · ASOS GRFTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-GRF-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the east (100 degrees) at 3 mph: force 1, a light air on the Beaufort scale.

Plan of the wind at Fort Lewis/Gray AAF, north up: blowing from 100 degrees, the east, 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 GRFFIG. C THE WIND AT FORT LEWIS/GRAY AAFPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 100°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEFort Lewis/Gray AAF, the windSTATION REPORT · ASOS GRFTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-GRF-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Fort Lewis/Gray AAF, in 6 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in Washington

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

Near Roy

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

Near Roy

River and lake gauges