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Riverpoint, Washington

Community in King County, Washington

Air quality

The air at Riverpoint

Index 17, good, led by fine particles. Read at 9 PM from its reporting area, Cascades of East King County (WA), 26 miles off.

17Good
  • Fine particles (PM2.5)17Good2.6 mi

The days ahead

Good each day through Sat Oct 17, led by fine particles. Yesterday measured 15, good.

Smoke, the next 44 hours

Little smoke near the ground through Sat 5 PM: the index from smoke stays at 17 or under.

FriSat

Precipitation

What has fallen at Riverpoint

None in the last 24 hours; 0.02 in over the last 3 days, to Thu 8 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 Riverpoint, the next 44 hours

Mist or haze: visibility falls to 2 miles Sat 11 AM.

FriSat

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

What is measuring near here

The 6 instruments nearest Riverpoint, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.5 miles away.

measured now4 instruments

measured daily2 instruments

Cedar LakeCEDW1

At a cooperative observer's station/5.1 mi away/1,568 ft/842 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Stampede Pass, drawn

The nearest airport reporting now, 22.9 mi from Riverpoint, Washington. From its report of Oct 15, 2026, 9:56 PM local time: 3 of its 5 sheets.

The sky

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

Section of the sky over Stampede Pass, 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 SMPFIG. A THE SKY OVER STAMPEDE PASSSECTION, 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 MORE0510TITLEStampede Pass, the skySTATION REPORT · ASOS SMPTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 5DATE2026-10-16IDSR-SMP-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

46.0 F with a dew point of 37.0 F, 71 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,100 ft up.

Chart of the air at Stampede Pass: temperature 46.0 degrees Fahrenheit and dew point 37.0, 71 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,100 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SMPFIG. B THE AIR AT STAMPEDE PASSTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00020 F30 F40 F50 F60 FSATURATES 2,100 FT ABOVE THE STATION, AT 35.0 FTEMPERATURE 46.0 FDEW POINT 37.0 FSPREAD 9.0 FRELATIVE HUMIDITY 71 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 POINTTITLEStampede Pass, the airSTATION REPORT · ASOS SMPTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 5DATE2026-10-16IDSR-SMP-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The column

At 3,967 ft above sea level, 14 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 25.87 inHg and the temperature at 44.9 F; the station's altimeter setting of 30.45 inHg means its barometer reads 26.33 inHg; it reports 46.0 F, 1.1 F warmer than standard.

Section from sea level of where Stampede Pass stands in the atmosphere, height to scale: the station 3,967 feet above sea level with 14 per cent of the air below it; the standard atmosphere's pressure there, 25.87 inches of mercury, and temperature, 44.9 degrees Fahrenheit; the altimeter setting of 30.45 and the station pressure it means, 26.33.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SMPFIG. D WHERE STAMPEDE PASS STANDS IN THE ATMOSPHERESECTION FROM SEA LEVEL, HEIGHT TO SCALE, THE STATION IN THE STANDARD ATMOSPHEREFT ABOVE SEA LEVEL05,00010,00015,000SEA LEVEL, 29.92 inHg IN THE STANDARD ATMOSPHERESTAMPEDE PASS14 PER CENT OF THE AIR BELOW IT3,967 FT10 PER CENT OF THE AIR BELOW, 2,890 FT20 PER CENT OF THE AIR BELOW, 6,050 FT30 PER CENT OF THE AIR BELOW, 9,540 FT40 PER CENT OF THE AIR BELOW, 13,470 FTSTANDARD PRESSURE HERE25.87 inHgSTANDARD TEMPERATURE HERE44.9 FALTIMETER SETTING, REPORTED30.45 inHgITS BAROMETER READS26.33 inHgTEMPERATURE, REPORTED46.0 FTITLEStampede Pass, the columnSTATION REPORT · ASOS SMPTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 3 of 5DATE2026-10-16IDSR-SMP-3DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The full report of Stampede Pass, in 5 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 Riverpoint

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

Near Riverpoint

River and lake gauges