Storm Station
Mertztown, Pennsylvania
58°
Light rain· Feels like 58°·Gentle breeze 9 mph N
Rain showers. Cloudy, with a high near 64. North wind 15 to 20 mph, with gusts as high as 40 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
-UV
-Air quality
83%Humidity
83%Cloud

What is measuring near here

The 5 instruments nearest Mertztown, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 1.4 miles away.

measured now3 instruments

AllentownXLL

At an airfield/10.5 mi away/400 ft/73 ft below here

temp, wind, gust, visibility, precip, pressure

Rank11of 544

Perkiomen Creek AT GraterfordGRAP1

At a river or reservoir gauge/22.1 mi away/161 ft/312 ft below here

temp, wind, gust, humidity, pressure

Rank301of 544

measured daily2 instruments

Mertztown 1.5 NWPA-BR-48

In a volunteer observer's own ground/1.4 mi away/484 ft/11 ft above here

precip, snowfall, snow depth

Rank-

PalmPLMP1

At a cooperative observer's station/12.3 mi away/289 ft/184 ft below here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Allentown, drawn

The nearest airport reporting now, 10.5 mi from Mertztown. From its report of Sep 27, 2026, 7:55 AM local time: 3 of its 6 sheets.

The sky

Overcast at 2,500 ft; the ceiling is 2,500 ft; visibility 5 mi.

Section of the sky over Allentown, height above the station to scale: overcast cloud with its base at 2,500 feet, the ceiling at 2,500 feet, and visibility of 5 mi.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT XLLFIG. A THE SKY OVER ALLENTOWNSECTION, 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 STATION05001,0001,5002,0002,5003,0003,5004,000ETAGESLOWTHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 2,500 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 2,500 FTVISIBILITY, MILES: 5 MI0510TITLEAllentown, the skySTATION REPORT · ASOS XLLTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-09-27IDSR-XLL-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

55.4 F with a dew point of 53.6 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 2,500 ft.

Chart of the air at Allentown: temperature 55.4 degrees Fahrenheit and dew point 53.6, 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 2,500 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT XLLFIG. B THE AIR AT ALLENTOWNTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,00040 F50 F60 F70 FSATURATES 400 FT ABOVE THE STATION, AT 53.2 FLOWEST CLOUD REPORTED, OVC 2,500 FTTEMPERATURE AND DEW POINT 55.4 F, 53.6 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 POINTTITLEAllentown, the airSTATION REPORT · ASOS XLLTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-09-27IDSR-XLL-2DRAWN AS linework on paperSOURCES FB-WAT-020, FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north northwest (340 degrees) at 9 mph: force 3, a gentle breeze on the Beaufort scale. The strongest gust today was 22 mph.

Plan of the wind at Allentown, north up: blowing from 340 degrees, the north northwest, at 9 miles an hour; beside it the Beaufort scale from calm to hurricane force, force 3, gentle breeze, marked.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT XLLFIG. C THE WIND AT ALLENTOWNPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 340°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE43GENTLE BREEZE8NOW, 9 MPH4MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLEAllentown, the windSTATION REPORT · ASOS XLLTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-09-27IDSR-XLL-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

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

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Snow on the ground

Elsewhere in Pennsylvania

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

Near Mertztown

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