Storm Station
Castalia, Iowa
58°
Overcast· Feels like 58°·Light air 2 mph SE
A chance of rain showers. Mostly cloudy, with a low around 56. Southeast wind around 3 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
-UV
-Air quality
87%Humidity
80%Cloud

What is measuring near here

The 5 instruments nearest Castalia, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 5.1 miles away.

measured now3 instruments

Decorah (IA 9)RDCI4

Beside a road/9.4 mi away/1,017 ft/228 ft below here

temp, pavement temp, wind, visibility, precip

Rank617of 652

DecorahDEH

At an airfield/11.9 mi away/1,157 ft/88 ft below here

temp, wind, gust, visibility, precip, pressure

Rank209of 652

measured daily2 instruments

Ossian 0.1 NNEIA-WH-2

In a volunteer observer's own ground/5.1 mi away/1,263 ft/18 ft above here

precip, snowfall, snow depth

Rank-

PostvillePSTI4

At a cooperative observer's station/6.1 mi away/1,148 ft/97 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Decorah, drawn

The nearest airport reporting now, 11.9 mi from Castalia. From its report of Sep 27, 2026, 3:55 AM local time: 3 of its 6 sheets.

The sky

Overcast at 3,200 ft; the ceiling is 3,200 ft; visibility 10 mi or more.

Section of the sky over Decorah, height above the station to scale: overcast cloud with its base at 3,200 feet, the ceiling at 3,200 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DEHFIG. A THE SKY OVER DECORAHSECTION, 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 STATION01,0002,0003,0004,0005,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 3,200 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 3,200 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEDecorah, the skySTATION REPORT · ASOS DEHTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-09-27IDSR-DEH-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

59.0 F with a dew point of 57.2 F, 94 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 400 ft up; the lowest cloud reported is at 3,200 ft.

Chart of the air at Decorah: temperature 59.0 degrees Fahrenheit and dew point 57.2, 94 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 400 feet above the station, against the lowest cloud reported at 3,200 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DEHFIG. B THE AIR AT DECORAHTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,00050 F60 F70 FSATURATES 400 FT ABOVE THE STATION, AT 56.7 FLOWEST CLOUD REPORTED, OVC 3,200 FTTEMPERATURE AND DEW POINT 59.0 F, 57.2 FRELATIVE HUMIDITY 94 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 POINTTITLEDecorah, the airSTATION REPORT · ASOS DEHTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-09-27IDSR-DEH-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

Calm.

Plan of the wind at Decorah, north up: calm; beside it the Beaufort scale from calm to hurricane force, force 0, calm, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT DEHFIG. C THE WIND AT DECORAHPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONCALMBEAUFORT FORCELEAST WIND, MPH0CALM0NOW, 0 MPH1LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEDecorah, the windSTATION REPORT · ASOS DEHTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-09-27IDSR-DEH-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

-in

Snow on the ground

Elsewhere in Iowa

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

Near Castalia

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