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Catheys Valley, California

Community in Mariposa County, California

Air quality

The air at Catheys Valley

Index 54, moderate, led by ozone. Read at 5 PM from its reporting area, Merced (CA), 22 miles off.

54Moderate
  • Fine particles (PM2.5)42Good-
  • Ozone54Moderate-
  • Coarse particles (PM10)50Good-

The days ahead

Moderate each day through Sat Oct 17, led by ozone. Yesterday measured 57, moderate.

Smoke, the next 42 hours

Little smoke near the ground through Sun 11 AM: the index from smoke stays at 6 or under.

FriSatSun

Precipitation

What has fallen at Catheys Valley

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 Catheys Valley, the next 42 hours

Visibility stays 10 miles or more through Sun 11 AM.

FriSatSun

On the radar over Catheys Valley, CaliforniaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 7 instruments nearest Catheys Valley, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 2.4 miles away.

measured now5 instruments

Catheys Valley RAWSCVBC1

A remote fire weather station/2.4 mi away/1,234 ft/188 ft below here

temp, wind, gust, humidity, pressure

Rank-

Citizen station DW4246DW4246

In a volunteer observer's own ground/19.5 mi away/181 ft/1,241 ft below here

temp, humidity, wind, precip, pressure

Rank-

SR-99 - Le Grand RoadCF108

Beside a road/20.3 mi away/200 ft/1,222 ft below here

temp, pavement temp, wind, visibility, precip

Rank-

MercedMCE

At an airfield/24.2 mi away/149 ft/1,273 ft below here

temp, wind, gust, visibility, precip, pressure

Rank-

Yosemite Village 12 W53150

At a climate reference station/27.3 mi away/6,620 ft/5,198 ft above here

temp, humidity, wind, solar, precip

Rank-

measured daily2 instruments

Mariposa 3.7 NNWCA-MP-1

In a volunteer observer's own ground/10.3 mi away/2,942 ft/1,520 ft above here

precip, snowfall, snow depth

Rank-

Exchequer DamEXQC1

At a dam/13.2 mi away/827 ft/595 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Merced, drawn

The nearest airport reporting now, 24.2 mi from Catheys Valley, California. From its report of Oct 16, 2026, 4:53 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 Merced, 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 MCEFIG. A THE SKY OVER MERCEDSECTION, 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 MORE0510TITLEMerced, the skySTATION REPORT · ASOS MCETYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-MCE-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

89.0 F with a dew point of 34.0 F, 14 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 12,400 ft up.

Chart of the air at Merced: temperature 89.0 degrees Fahrenheit and dew point 34.0, 14 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 12,400 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MCEFIG. B THE AIR AT MERCEDTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION02,0004,0006,0008,00010,00012,00014,00016,00010 F30 F50 F70 F90 FSATURATES 12,400 FT ABOVE THE STATION, AT 23.0 FTEMPERATURE 89.0 FDEW POINT 34.0 FSPREAD 55.0 FRELATIVE HUMIDITY 14 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 POINTTITLEMerced, the airSTATION REPORT · ASOS MCETYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-MCE-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Merced, north up: calm; beside it the Beaufort scale from calm to hurricane force, force 0, calm, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MCEFIG. C THE WIND AT MERCEDPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEMerced, the windSTATION REPORT · ASOS MCETYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-MCE-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Merced, in 6 sheets, each beside the Field Book plates that explain it

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Snow on the ground

Elsewhere in California

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

Near Catheys Valley

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

Near Catheys Valley

River and lake gauges