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Rossmoor, California

Community in Orange County, California

Air quality

The air at Rossmoor

Index 70, moderate, led by nitrogen dioxide. Read at 11 PM from its reporting area, South Coastal LA (CA), 7 miles off.

70Moderate
  • Fine particles (PM2.5)41Good8.6 mi
  • Ozone15Good39 ppb8.6 mi
  • Coarse particles (PM10)23Good8.6 mi
  • Nitrogen dioxide70Moderate72.3 ppb8.4 mi
  • Sulfur dioxide0Good0.5 ppb20.9 mi
  • Carbon monoxide-0.4 ppm9.5 mi

The days ahead

Moderate each day through Today, led by coarse particles. Yesterday measured 45, good.

Smoke, the next 42 hours

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

FriSat

Precipitation

What has fallen at Rossmoor

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

Last 24 hours
0.00in
Last 3 days
0.00in

Visibility

How far you can see at Rossmoor, the next 42 hours

Visibility stays 10 miles or more through Sat 5 PM.

FriSat

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

What is measuring near here

The 6 instruments nearest Rossmoor, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.3 miles away.

measured now4 instruments

measured daily2 instruments

Los Alamitos 1.3 WSWCA-OR-56

In a volunteer observer's own ground/0.3 mi away/12 ft/5 ft below here

precip, snowfall, snow depth

Rank-

Santa Ana Fire STNSTAC1

At a cooperative observer's station/12.6 mi away/125 ft/108 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Los Alamitos AAF, drawn

The nearest airport reporting now, 1.6 mi from Rossmoor, California. From its report of Oct 15, 2026, 10:55 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 Los Alamitos 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 SLIFIG. A THE SKY OVER LOS ALAMITOS 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 MORE0510TITLELos Alamitos AAF, the skySTATION REPORT · ASOS SLITYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-SLI-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

82.4 F with a dew point of 37.2 F, 20 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 10,200 ft up.

Chart of the air at Los Alamitos AAF: temperature 82.4 degrees Fahrenheit and dew point 37.2, 20 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 10,200 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SLIFIG. B THE AIR AT LOS ALAMITOS 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 STATION02,0004,0006,0008,00010,00012,00020 F40 F60 F80 FSATURATES 10,200 FT ABOVE THE STATION, AT 28.0 FTEMPERATURE 82.4 FDEW POINT 37.2 FSPREAD 45.2 FRELATIVE HUMIDITY 20 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 POINTTITLELos Alamitos AAF, the airSTATION REPORT · ASOS SLITYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-SLI-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northeast (40 degrees) at 8 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 21 mph.

Plan of the wind at Los Alamitos AAF, north up: blowing from 40 degrees, the northeast, at 8 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT SLIFIG. C THE WIND AT LOS ALAMITOS AAFPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 40°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 8 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLELos Alamitos AAF, the windSTATION REPORT · ASOS SLITYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-SLI-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Los Alamitos AAF, 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 Rossmoor

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

Near Rossmoor

River and lake gauges