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Lake Ketchum, Washington

Community in Snohomish County, Washington

Air quality

The air at Lake Ketchum

Index 23, good, led by fine particles. Read at 1 PM from its reporting area, Mount Vernon (WA), 8 miles off.

23Good
  • Fine particles (PM2.5)23Good8.3 mi

The days ahead

Highest moderate, today, led by fine particles. Yesterday measured 17, good.

Smoke, the next 40 hours

Little smoke near the ground through Sun 5 AM: the index from smoke stays at 11 or under.

FriSatSun

Precipitation

What has fallen at Lake Ketchum

None in the last 24 hours; 0.02 in over the last 3 days, to Fri 1 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 Lake Ketchum, the next 46 hours

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

FriSatSun

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

What is measuring near here

The 6 instruments nearest Lake Ketchum, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 3.5 miles away.

measured now4 instruments

measured daily2 instruments

Padilla Bay FarmPBFW1

On a farm or research station/13.5 mi away/3 ft/240 ft below here

snowfall, snow depth, precip, high, low

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Station report

The weather at Arlington Muni, drawn

The nearest airport reporting now, 12.2 mi from Lake Ketchum, Washington. From its report of Oct 16, 2026, 1:56 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 Arlington Muni, 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 AWOFIG. A THE SKY OVER ARLINGTON MUNISECTION, 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 MORE0510TITLEArlington Muni, the skySTATION REPORT · ASOS AWOTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-AWO-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

77.0 F with a dew point of 44.0 F, 31 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 7,500 ft up.

Chart of the air at Arlington Muni: temperature 77.0 degrees Fahrenheit and dew point 44.0, 31 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 7,500 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT AWOFIG. B THE AIR AT ARLINGTON MUNITHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION02,0004,0006,0008,00010,00030 F40 F50 F60 F70 F80 F90 FSATURATES 7,500 FT ABOVE THE STATION, AT 37.0 FTEMPERATURE 77.0 FDEW POINT 44.0 FSPREAD 33.0 FRELATIVE HUMIDITY 31 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 POINTTITLEArlington Muni, the airSTATION REPORT · ASOS AWOTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-AWO-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south southwest (210 degrees) at 6 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at Arlington Muni, north up: blowing from 210 degrees, the south southwest, at 6 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 2, light breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT AWOFIG. C THE WIND AT ARLINGTON MUNIPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 210°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 6 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEArlington Muni, the windSTATION REPORT · ASOS AWOTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-AWO-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Arlington Muni, 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 Lake Ketchum

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

Near Lake Ketchum

River and lake gauges