Storm Station
Portola, California
63°
Overcast· Feels like 63°·Gentle breeze 9 mph WSW
A slight chance of rain showers before 2am. Cloudy, with a low around 45. Northeast wind 0 to 5 mph. Chance of precipitation is 20%.
-UV
-Air quality
33%Humidity
87%Cloud

What is measuring near here

The 5 instruments nearest Portola, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.4 miles away.

measured now3 instruments

Portola 1NWXPTC1

At a river or reservoir gauge/1.6 mi away/4,951 ft/98 ft above here

temp, wind, gust, humidity, pressure

Rank1,624of 3,115

Spring GardenCD018

Beside a road/19.9 mi away/3,799 ft/1,054 ft below here

temp, pavement temp, wind, visibility, precip

Rank2,101of 3,115

Truckee-TahoeTRK

At an airfield/38.1 mi away/5,899 ft/1,046 ft above here

temp, wind, gust, visibility, precip, pressure

Rank3,059of 3,115

measured daily2 instruments

PortolaPRAC1

At a cooperative observer's station/0.4 mi away/4,848 ft/5 ft below here

snowfall, snow depth, precip, high, low

Rank-

Portola 0.5 WNWCA-PM-16

In a volunteer observer's own ground/0.4 mi away/4,845 ft/8 ft below here

precip, snowfall, snow depth

Rank-

Station report

The weather at Truckee-Tahoe, drawn

The nearest airport reporting now, 38.1 mi from Portola. From its report of Sep 27, 2026, 1:15 AM 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 Truckee-Tahoe, 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 TRKFIG. A THE SKY OVER TRUCKEE-TAHOESECTION, 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 MORE0510TITLETruckee-Tahoe, the skySTATION REPORT · ASOS TRKTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-09-27IDSR-TRK-1DRAWN AS linework on paperSOURCES FB-SKY-001

The air

55.4 F with a dew point of 26.6 F, 33 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 6,500 ft up.

Chart of the air at Truckee-Tahoe: temperature 55.4 degrees Fahrenheit and dew point 26.6, 33 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 6,500 feet above the station; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT TRKFIG. B THE AIR AT TRUCKEE-TAHOETHE 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 F20 F30 F40 F50 F60 F70 FSATURATES 6,500 FT ABOVE THE STATION, AT 20.7 FTEMPERATURE 55.4 FDEW POINT 26.6 FSPREAD 28.8 FRELATIVE HUMIDITY 33 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 POINTTITLETruckee-Tahoe, the airSTATION REPORT · ASOS TRKTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-09-27IDSR-TRK-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south (190 degrees) at 7 mph, gusting 10 mph: force 2, a light breeze on the Beaufort scale. The strongest gust today was 10 mph.

Plan of the wind at Truckee-Tahoe, north up: blowing from 190 degrees, the south, at 7 miles an hour, gusting 10; beside it the Beaufort scale from calm to hurricane force, force 2, light breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT TRKFIG. C THE WIND AT TRUCKEE-TAHOEPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 190°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 7 MPH3GENTLE BREEZE8GUST, 10 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLETruckee-Tahoe, the windSTATION REPORT · ASOS TRKTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-09-27IDSR-TRK-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Truckee-Tahoe, 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 Portola

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