Storm Station
Sign in

Walnut, Iowa

City in Pottawattamie County, Iowa

Air quality

The air at Walnut

Index 27, good, led by fine particles. Read at 11 PM from its reporting area, Viking Lake State Park (IA), 36 miles off.

27Good
  • Fine particles (PM2.5)27Good-
  • Ozone18Good-

The days ahead

Good each day through Today, led by fine particles. Yesterday measured 34, good.

Smoke, the next 44 hours

No smoke near the ground through Sat 7 PM.

FriSat

Precipitation

What has fallen at Walnut

0.94 in in the last 24 hours, 1.05 in over the last 3 days, to Thu 10 PM. Measured by radar and rain gauges, as water.

Last 24 hours
0.94in
Last 3 days
1.05in

Visibility

How far you can see at Walnut, the next 44 hours

Visibility stays 8 miles or more through Sat 7 PM, lowest 8 miles Sat 6 AM.

FriSat

On the radar over Walnut, IowaReflectivityStorm topsRain rateRain, last 24 hoursForecast temperatureForecast rain totalEvery picture

What is measuring near here

The 6 instruments nearest Walnut, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 3.8 miles away.

measured now4 instruments

HarlanHNR

At an airfield/9.3 mi away/1,194 ft/152 ft below here

temp, wind, gust, visibility, precip, pressure

Rank237of 1,060

Irwin 3 ESEIRWI4

At a river or reservoir gauge/20.4 mi away/1,322 ft/24 ft below here

temp, wind, gust, humidity, pressure

Rank-

measured daily2 instruments

Lewis 3.7 NWIA-CS-8

In a volunteer observer's own ground/10.3 mi away/1,135 ft/211 ft below here

precip, snowfall, snow depth

Rank-

Atlantic 1 NEATLI4

At a cooperative observer's station/12.1 mi away/1,168 ft/178 ft below here

snowfall, snow depth, precip, high, low

Rank841of 1,060

Station report

The weather at Harlan, drawn

The nearest airport reporting now, 9.3 mi from Walnut, Iowa. From its report of Oct 15, 2026, 11:55 PM local time: 3 of its 6 sheets.

The sky

Scattered at 5,000 ft; visibility 10 mi or more.

Section of the sky over Harlan, height above the station to scale: scattered cloud with its base at 5,000 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT HNRFIG. A THE SKY OVER HARLANSECTION, 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 STATION01,0002,0003,0004,0005,0006,0007,0008,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETSCT 5,000 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYVISIBILITY, MILES: 10 MI OR MORE0510TITLEHarlan, the skySTATION REPORT · ASOS HNRTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-10-16IDSR-HNR-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

46.4 F with a dew point of 39.2 F, 76 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,700 ft up; the lowest cloud reported is at 5,000 ft.

Chart of the air at Harlan: temperature 46.4 degrees Fahrenheit and dew point 39.2, 76 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,700 feet above the station, against the lowest cloud reported at 5,000 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT HNRFIG. B THE AIR AT HARLANTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,0007,00030 F40 F50 F60 FSATURATES 1,700 FT ABOVE THE STATION, AT 37.6 FLOWEST CLOUD REPORTED, SCT 5,000 FTTEMPERATURE 46.4 FDEW POINT 39.2 FSPREAD 7.2 FRELATIVE HUMIDITY 76 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 POINTTITLEHarlan, the airSTATION REPORT · ASOS HNRTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-10-16IDSR-HNR-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the northwest (310 degrees) at 15 mph, gusting 22 mph: force 4, a moderate breeze on the Beaufort scale. The strongest gust today was 35 mph.

Plan of the wind at Harlan, north up: blowing from 310 degrees, the northwest, at 15 miles an hour, gusting 22; beside it the Beaufort scale from calm to hurricane force, force 4, moderate breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT HNRFIG. C THE WIND AT HARLANPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 310°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE13NOW, 15 MPH5FRESH BREEZE19GUST, 22 MPH6STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEHarlan, the windSTATION REPORT · ASOS HNRTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-10-16IDSR-HNR-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

-

Snow on the ground

Elsewhere in Iowa

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

Near Walnut

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

Near Walnut

River and lake gauges