Storm Station
Port Costa, California
59°
Partly cloudy· Feels like 59°·Gentle breeze 9 mph WSW
Mostly cloudy, with a low around 54. Southwest wind around 12 mph, with gusts as high as 18 mph.
-UV
51Air quality
40%Humidity
64%Cloud

What is measuring near here

The 4 instruments nearest Port Costa, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.1 miles away.

measured now2 instruments

Boony Doon FireBONC1

At a river or reservoir gauge/2.1 mi away/69 ft/40 ft above here

temp, wind, gust, humidity, pressure

Rank385of 3,115

Concord/BuchananCCR

At an airfield/8.1 mi away/16 ft/13 ft below here

temp, wind, gust, visibility, precip, pressure

Rank7of 3,115

measured daily2 instruments

Benicia 1.3 SWCA-SO-10

In a volunteer observer's own ground/1.1 mi away/9 ft/20 ft below here

precip, snowfall, snow depth

Rank-

VallejoVLJC1

At a cooperative observer's station/3.7 mi away/362 ft/333 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Concord/Buchanan, drawn

The nearest airport reporting now, 8.1 mi from Port Costa. From its report of Sep 26, 2026, 11:53 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 Concord/Buchanan, 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 CCRFIG. A THE SKY OVER CONCORD/BUCHANANSECTION, 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 MORE0510TITLEConcord/Buchanan, the skySTATION REPORT · ASOS CCRTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-09-27IDSR-CCR-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

61.0 F with a dew point of 51.0 F, 70 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,300 ft up.

Chart of the air at Concord/Buchanan: temperature 61.0 degrees Fahrenheit and dew point 51.0, 70 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,300 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT CCRFIG. B THE AIR AT CONCORD/BUCHANANTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,00040 F50 F60 F70 FSATURATES 2,300 FT ABOVE THE STATION, AT 48.7 FTEMPERATURE 61.0 FDEW POINT 51.0 FSPREAD 10.0 FRELATIVE HUMIDITY 70 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 POINTTITLEConcord/Buchanan, the airSTATION REPORT · ASOS CCRTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-09-27IDSR-CCR-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south (180 degrees) at 12 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 18 mph.

Plan of the wind at Concord/Buchanan, north up: blowing from 180 degrees, the south, at 12 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 CCRFIG. C THE WIND AT CONCORD/BUCHANANPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 180°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 12 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEConcord/Buchanan, the windSTATION REPORT · ASOS CCRTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-09-27IDSR-CCR-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

-in

Snow on the ground

Elsewhere in California

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

Near Port Costa

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