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Castle Rock, Washington

City in Cowlitz County, Washington

Air quality

The air at Castle Rock

Index 41, good, led by fine particles. Read at 5 PM from its reporting area, Longview (WA), 9 miles off.

41Good
  • Fine particles (PM2.5)41Good-

The days ahead

Good each day through Sat Oct 17, led by fine particles. Yesterday measured 26, good.

Smoke, the next 42 hours

Little smoke near the ground through Sun 11 AM: the index from smoke stays at 17 or under.

FriSatSun

Precipitation

What has fallen at Castle Rock

None in the last 3 days, to Fri 5 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.00in
Last 3 days
0.00in

Visibility

How far you can see at Castle Rock, the next 42 hours

Visibility stays 6 miles or more through Sun 11 AM, lowest 6 miles Sat 3 AM.

FriSatSun

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

What is measuring near here

The 6 instruments nearest Castle Rock, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 5.4 miles away.

measured now4 instruments

measured daily2 instruments

KelsoLOVW1

At a cooperative observer's station/8.6 mi away/36 ft/18 ft below here

snowfall, snow depth, precip, high, low

Rank758of 1,444

Station report

The weather at Kelso-Longveiw AWOS, drawn

The nearest airport reporting now, 10.7 mi from Castle Rock, Washington. From its report of Oct 16, 2026, 5:56 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 Kelso-Longveiw AWOS, 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 KLSFIG. A THE SKY OVER KELSO-LONGVEIW AWOSSECTION, 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 MORE0510TITLEKelso-Longveiw AWOS, the skySTATION REPORT · ASOS KLSTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-17IDSR-KLS-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

71.0 F with a dew point of 48.0 F, 44 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 5,300 ft up.

Chart of the air at Kelso-Longveiw AWOS: temperature 71.0 degrees Fahrenheit and dew point 48.0, 44 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 5,300 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT KLSFIG. B THE AIR AT KELSO-LONGVEIW AWOSTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,0007,00030 F40 F50 F60 F70 F80 FSATURATES 5,300 FT ABOVE THE STATION, AT 43.0 FTEMPERATURE 71.0 FDEW POINT 48.0 FSPREAD 23.0 FRELATIVE HUMIDITY 44 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 POINTTITLEKelso-Longveiw AWOS, the airSTATION REPORT · ASOS KLSTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-17IDSR-KLS-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northwest (310 degrees) at 3 mph: force 1, a light air on the Beaufort scale.

Plan of the wind at Kelso-Longveiw AWOS, north up: blowing from 310 degrees, the northwest, 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 KLSFIG. C THE WIND AT KELSO-LONGVEIW AWOSPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 310°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEKelso-Longveiw AWOS, the windSTATION REPORT · ASOS KLSTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-17IDSR-KLS-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Kelso-Longveiw AWOS, 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 Castle Rock

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

Near Castle Rock

River and lake gauges