Storm Station
Union, Iowa
59°
Light rain· Feels like 59°·Light breeze 5 mph ESE
Showers and thunderstorms likely. Cloudy, with a low around 57. Southeast wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts less than a tenth of an inch possible.
-UV
-Air quality
90%Humidity
96%Cloud

What is measuring near here

The 6 instruments nearest Union, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 6.7 miles away.

measured now4 instruments

MarshalltownMIW

At an airfield/12.0 mi away/974 ft/23 ft above here

temp, wind, gust, visibility, precip, pressure

Rank6of 652

Steamboat Rock (US20)RSBI4

Beside a road/14.5 mi away/1,142 ft/191 ft above here

temp, pavement temp, wind, visibility, precip

Rank617of 652

AmesS2031

At a soil climate station/37.5 mi away/1,073 ft/122 ft above here

temp, humidity, soil temp, soil moisture

Rank-

Ames ScanAMMI4

At a river or reservoir gauge/37.6 mi away/1,073 ft/122 ft above here

temp, wind, gust, humidity, pressure

Rank199of 652

measured daily2 instruments

Conrad 5.2 NWIA-GY-7

In a volunteer observer's own ground/6.7 mi away/1,051 ft/100 ft above here

precip, snowfall, snow depth

Rank-

ZearingZRGI4

At a cooperative observer's station/13.6 mi away/1,056 ft/105 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Marshalltown, drawn

The nearest airport reporting now, 12.0 mi from Union. From its report of Sep 27, 2026, 4:53 AM local time: 3 of its 6 sheets.

The sky

A few clouds at 500 ft, broken at 2,800 ft, overcast at 3,900 ft; the ceiling is 2,800 ft; visibility 6 mi.

Section of the sky over Marshalltown, height above the station to scale: a few clouds cloud with its base at 500 feet, broken cloud with its base at 2,800 feet, overcast cloud with its base at 3,900 feet, the ceiling at 2,800 feet, and visibility of 6 mi.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MIWFIG. A THE SKY OVER MARSHALLTOWNSECTION, 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 STATION01,0002,0003,0004,0005,0006,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 3,900 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 2,800 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYFEW 500 FTA FEW CLOUDS, 1 TO 2 EIGHTHS OF THE SKYCEILING 2,800 FTVISIBILITY, MILES: 6 MI0510TITLEMarshalltown, the skySTATION REPORT · ASOS MIWTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-09-27IDSR-MIW-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

57.0 F with a dew point of 56.0 F, 96 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 200 ft up; the lowest cloud reported is at 500 ft.

Chart of the air at Marshalltown: temperature 57.0 degrees Fahrenheit and dew point 56.0, 96 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 200 feet above the station, against the lowest cloud reported at 500 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MIWFIG. B THE AIR AT MARSHALLTOWNTHE 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 200 FT ABOVE THE STATION, AT 55.7 FLOWEST CLOUD REPORTED, FEW 500 FTTEMPERATURE AND DEW POINT 57.0 F, 56.0 FRELATIVE HUMIDITY 96 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 POINTTITLEMarshalltown, the airSTATION REPORT · ASOS MIWTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-09-27IDSR-MIW-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the east (100 degrees) at 5 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at Marshalltown, north up: blowing from 100 degrees, the east, at 5 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 2, light breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT MIWFIG. C THE WIND AT MARSHALLTOWNPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 100°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 5 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEMarshalltown, the windSTATION REPORT · ASOS MIWTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-09-27IDSR-MIW-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

0in

Snow on the ground

Measured at Zearing (ZRGI4), 13.6 miles from here, read 26 Sep, 07:00. measured daily

Elsewhere in Iowa

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

Near Union

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