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Portsmouth, Iowa

City in Shelby County, Iowa

Air quality

The air at Portsmouth

Index 19, good, led by ozone. Read at 5 AM from its reporting area, Pisgah (IA), 24 miles off.

19Good
  • Ozone19Good19 ppb24.5 mi

The days ahead

Good each day through Today, led by ozone. Yesterday measured 20, good.

Smoke, the next 44 hours

No smoke near the ground through Sun 1 AM.

FriSat

Precipitation

What has fallen at Portsmouth

0.94 in in the last 24 hours, 1.00 in over the last 3 days, to Fri 5 AM. Measured by radar and rain gauges, as water.

Last 24 hours
0.94in
Last 3 days
1.00in

Visibility

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

Visibility stays 8 miles or more through Sun 1 AM, lowest 8 miles Sat 3 AM.

FriSat

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

What is measuring near here

The 6 instruments nearest Portsmouth, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 4.8 miles away.

measured now4 instruments

HarlanHNR

At an airfield/10.5 mi away/1,194 ft/38 ft below here

temp, wind, gust, visibility, precip, pressure

Rank237of 1,060

Irwin 3 ESEIRWI4

At a river or reservoir gauge/20.8 mi away/1,322 ft/90 ft above here

temp, wind, gust, humidity, pressure

Rank-

measured daily2 instruments

Portsmouth 4.8 WIA-HR-20

In a volunteer observer's own ground/4.8 mi away/1,345 ft/113 ft above here

precip, snowfall, snow depth

Rank-

LoganLOGI4

At a cooperative observer's station/15.4 mi away/1,142 ft/90 ft below here

snowfall, snow depth, precip, high, low

Rank134of 1,060

Station report

The weather at Harlan, drawn

The nearest airport reporting now, 10.5 mi from Portsmouth, Iowa. From its report of Oct 16, 2026, 5:55 AM local time: 3 of its 6 sheets.

The sky

Scattered at 2,700 ft, broken at 3,400 ft, overcast at 3,900 ft; the ceiling is 3,400 ft; visibility 10 mi or more.

Section of the sky over Harlan, height above the station to scale: scattered cloud with its base at 2,700 feet, broken cloud with its base at 3,400 feet, overcast cloud with its base at 3,900 feet, the ceiling at 3,400 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 STATION01,0002,0003,0004,0005,0006,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 3,900 FTOVERCAST, 8 EIGHTHS OF THE SKYBKN 3,400 FTBROKEN, 5 TO 7 EIGHTHS OF THE SKYSCT 2,700 FTSCATTERED, 3 TO 4 EIGHTHS OF THE SKYCEILING 3,400 FTVISIBILITY, 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 41.0 F, 81 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 1,200 ft up; the lowest cloud reported is at 2,700 ft.

Chart of the air at Harlan: temperature 46.4 degrees Fahrenheit and dew point 41.0, 81 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 1,200 feet above the station, against the lowest cloud reported at 2,700 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 STATION01,0002,0003,0004,00030 F40 F50 F60 FSATURATES 1,200 FT ABOVE THE STATION, AT 39.7 FLOWEST CLOUD REPORTED, SCT 2,700 FTTEMPERATURE 46.4 FDEW POINT 41.0 FSPREAD 5.4 FRELATIVE HUMIDITY 81 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 (320 degrees) at 21 mph, gusting 26 mph: force 5, a fresh breeze on the Beaufort scale. The strongest gust today was 31 mph.

Plan of the wind at Harlan, north up: blowing from 320 degrees, the northwest, at 21 miles an hour, gusting 26; beside it the Beaufort scale from calm to hurricane force, force 5, fresh 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 320°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE19NOW, 21 MPH6STRONG BREEZE25GUST, 26 MPH7NEAR 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

0in

Snow on the ground

Measured at Logan (LOGI4), 15.4 miles from here, read 15 Oct, 07:00. measured daily

Elsewhere in Iowa

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

Near Portsmouth

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

Near Portsmouth

River and lake gauges