Storm Station
Portsmouth, Iowa
67°
Light rain· Feels like 67°·Light breeze 8 mph SSE
A chance of showers and thunderstorms before 4am, then a chance of showers and thunderstorms between 4am and 5am, then a slight chance of showers and thunderstorms. Mostly cloudy. Low around 62, with temperatures rising to around 64 overnight. Southeast wind around 5 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
-UV
-Air quality
90%Humidity
87%Cloud

What is measuring near here

The 5 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 now3 instruments

HarlanHNR

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

temp, wind, gust, visibility, precip, pressure

Rank245of 652

Avoca (I-80)RAVI4

Beside a road/15.8 mi away/1,237 ft/5 ft above here

temp, pavement temp, wind, visibility, precip

Rank564of 652

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

Rank-

Station report

The weather at Harlan, drawn

The nearest airport reporting now, 10.5 mi from Portsmouth. From its report of Sep 27, 2026, 3:15 AM local time: 3 of its 6 sheets.

The sky

Overcast at 800 ft; the ceiling is 800 ft; visibility 10 mi or more.

Section of the sky over Harlan, height above the station to scale: overcast cloud with its base at 800 feet, the ceiling at 800 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 STATION05001,0001,5002,0002,5003,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 800 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 800 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLEHarlan, the skySTATION REPORT · ASOS HNRTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-09-27IDSR-HNR-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

64.4 F with a dew point of 64.4 F, 100 per cent relative humidity. The air is saturated at the ground; the lowest cloud reported is at 800 ft.

Chart of the air at Harlan: temperature 64.4 degrees Fahrenheit and dew point 64.4, 100 per cent relative humidity; the air saturated at the ground, against the lowest cloud reported at 800 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 STATION01,0002,0003,00050 F60 F70 F80 FSATURATED AT THE GROUNDLOWEST CLOUD REPORTED, OVC 800 FTTEMPERATURE AND DEW POINT 64.4 F, 64.4 FRELATIVE HUMIDITY 100 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 6DATE2026-09-27IDSR-HNR-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the south (170 degrees) at 5 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at Harlan, north up: blowing from 170 degrees, the south, 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 HNRFIG. C THE WIND AT HARLANPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 170°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 5 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEHarlan, the windSTATION REPORT · ASOS HNRTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-09-27IDSR-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 26 Sep, 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.