Storm Station
Ottumwa, Iowa
59°
Light rain· Feels like 59°·Light breeze 6 mph E
Showers and thunderstorms before 7am, then drizzle between 7am and 1pm. Cloudy, with a high near 68. East southeast wind around 3 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch possible.
-UV
-Air quality
93%Humidity
93%Cloud

What is measuring near here

The 5 instruments nearest Ottumwa, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 0.5 miles away.

measured now3 instruments

Ottumwa (US 63)ROTI4

Beside a road/0.5 mi away/643 ft/5 ft below here

temp, pavement temp, wind, visibility, precip

Rank-

OttumwaOTM

At an airfield/6.0 mi away/846 ft/198 ft above here

temp, wind, gust, visibility, precip, pressure

Rank-

Red Rock DamRRMI4

At a dam/38.3 mi away/722 ft/74 ft above here

temp, wind, gust, humidity, pressure

Rank198of 652

measured daily2 instruments

Ottumwa 1.6 SIA-WP-1

In a volunteer observer's own ground/1.5 mi away/650 ft/2 ft above here

precip, snowfall, snow depth

Rank-

OttumwaOTWI4

At a cooperative observer's station/1.9 mi away/804 ft/156 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Red Rock Dam, drawn

The nearest instrument reporting now, 38.3 mi from Ottumwa. From its report of Sep 27, 2026, 5:00 AM local time: 3 of its 4 sheets.

The wind

From the east southeast (120 degrees) at 3 mph: force 1, a light air on the Beaufort scale.

Plan of the wind at Red Rock Dam, north up: blowing from 120 degrees, the east southeast, at 3 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 1, light air, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RRMI4FIG. C THE WIND AT RED ROCK DAMPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 120°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR1NOW, 3 MPH2LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLERed Rock Dam, the windSTATION REPORT · DCP RRMI4TYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 1 of 4DATE2026-09-27IDSR-RRMI4-1DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008

The column

At 722 ft above sea level, 3 per cent of the atmosphere's air lies below the station. The standard atmosphere puts the pressure there at 29.15 inHg and the temperature at 56.4 F.

Section from sea level of where Red Rock Dam stands in the atmosphere, height to scale: the station 722 feet above sea level with 3 per cent of the air below it; the standard atmosphere's pressure there, 29.15 inches of mercury, and temperature, 56.4 degrees Fahrenheit.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RRMI4FIG. D WHERE RED ROCK DAM STANDS IN THE ATMOSPHERESECTION FROM SEA LEVEL, HEIGHT TO SCALE, THE STATION IN THE STANDARD ATMOSPHEREFT ABOVE SEA LEVEL05,00010,00015,000SEA LEVEL, 29.92 inHg IN THE STANDARD ATMOSPHERERED ROCK DAM3 PER CENT OF THE AIR BELOW IT722 FT10 PER CENT OF THE AIR BELOW, 2,890 FT20 PER CENT OF THE AIR BELOW, 6,050 FT30 PER CENT OF THE AIR BELOW, 9,540 FT40 PER CENT OF THE AIR BELOW, 13,470 FTSTANDARD PRESSURE HERE29.15 inHgSTANDARD TEMPERATURE HERE56.4 FTITLERed Rock Dam, the columnSTATION REPORT · DCP RRMI4TYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 4DATE2026-09-27IDSR-RRMI4-2DRAWN AS linework on paperSOURCES FB-ENG-001, FB-ENG-003

The sun

On Sep 27 the noon sun stands 47 degrees above the horizon at 41.37 N, and the day is 11 h 47 min long. Level ground there takes 73 per cent of the noon sunlight a surface facing the sun would.

Elevation of the noon sun at Red Rock Dam, angles true: on Sep 27 it stands 47 degrees above the horizon, against 72 at the June solstice, 49 at the equinoxes and 25 at the December solstice; the day is 11 h 47 min long.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT RRMI4FIG. E THE SUN AT RED ROCK DAMELEVATION LOOKING WEST, SOUTH TO THE LEFT: THE NOON SUN ON THE DAY OF THE REPORT, AND AT THE SOLSTICES AND EQUINOXES; ANGLES TRUETHE STATIONJUNE SOLSTICE 72°EQUINOXES 49°DECEMBER SOLSTICE 25°SEP 27, 47°SOUTHANGLES TRUE; THE RAYS ARE OF ONE LENGTH AND DRAW DIRECTION ONLYDAY LENGTH 11 H 47 MINLEVEL GROUND TAKES 73 PER CENT OF THE NOON SUN A FACING SURFACE WOULDLATITUDE 41.37 N; THE SUN'S DECLINATION -1.8°TITLERed Rock Dam, the sunSTATION REPORT · DCP RRMI4TYPEELEVATIONSCALEANGLES TRUEREVAS REPORTED SHEET 3 of 4DATE2026-09-27IDSR-RRMI4-3DRAWN AS linework on paperSOURCES FB-ENG-007

The full report of Red Rock Dam, in 4 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 Ottumwa

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