Storm Station
Mercersburg, Pennsylvania
63° 66°/60°
Overcast· Feels like 63°·Gentle breeze 9 mph NNW
Cloudy, with a low around 58. Northwest wind around 13 mph, with gusts as high as 21 mph.
0UV Low
34Air quality
62%Humidity
100%Cloud
Now
3:15 AM
63feels63
now, overcast
Today
Sep 27
6660
32%
17mph
overcast
Mon
Sep 28
6959
10%
14mph
overcast
Tue
Sep 29
7360
drizzle light
Wed
Sep 30
8256
overcast
Thu
Oct 1
8858
overcast
Fri
Oct 2
8056
14%
drizzle
Sat
Oct 3
6346
30%
overcast
63°
66°60°
69°59°
73°60°
82°56°
88°58°
80°56°
63°46°

As of 3:15 AM in Mercersburg, Pennsylvania.

What is measuring near here

The 4 instruments nearest Mercersburg, how far away each one is, how high it stands, and what kind of measurement it makes. The nearest is 9.9 miles away.

measured now2 instruments

I-81 Franklin MM11 NBPA078

Beside a road/12.5 mi away/656 ft/91 ft above here

temp, pavement temp, wind, visibility, precip

Rank476of 543

Liberty - Raven RockXIF

At an airfield/26.1 mi away/1,141 ft/576 ft above here

temp, wind, gust, visibility, precip, pressure

Rank19of 543

measured daily2 instruments

Greencastle 0.3 SPA-FN-18

In a volunteer observer's own ground/9.9 mi away/607 ft/42 ft above here

precip, snowfall, snow depth

Rank-

Chambersburg 1 ESECHMP1

At a cooperative observer's station/15.9 mi away/643 ft/78 ft above here

snowfall, snow depth, precip, high, low

Rank-

Station report

The weather at Liberty - Raven Rock, drawn

The nearest airport reporting now, 26.1 mi from Mercersburg. From its report of Sep 27, 2026, 2:55 AM local time: 3 of its 6 sheets.

The sky

Overcast at 4,200 ft; the ceiling is 4,200 ft; visibility 10 mi or more.

Section of the sky over Liberty - Raven Rock, height above the station to scale: overcast cloud with its base at 4,200 feet, the ceiling at 4,200 feet, and visibility of 10 mi or more.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT XIFFIG. A THE SKY OVER LIBERTY - RAVEN ROCKSECTION, 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 STATION01,0002,0003,0004,0005,0006,0007,000ETAGESLOWMIDDLETHE STATIONTHE CEILOMETER READS TO 12,000 FT, ABOVE THIS SHEETOVC 4,200 FTOVERCAST, 8 EIGHTHS OF THE SKYCEILING 4,200 FTVISIBILITY, MILES: 10 MI OR MORE0510TITLELiberty - Raven Rock, the skySTATION REPORT · ASOS XIFTYPESECTIONSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 1 of 6DATE2026-09-27IDSR-XIF-1DRAWN AS linework on paperSOURCES FB-SKY-001, FB-SKY-017, FB-SKY-016, FB-SKY-018

The air

61.5 F with a dew point of 49.3 F, 64 per cent relative humidity. Air lifted from the station would cool to its dew point, where cloud forms, about 2,800 ft up; the lowest cloud reported is at 4,200 ft.

Chart of the air at Liberty - Raven Rock: temperature 61.5 degrees Fahrenheit and dew point 49.3, 64 per cent relative humidity; air lifted from the station cools along the dry rate and meets its dew point about 2,800 feet above the station, against the lowest cloud reported at 4,200 feet; height to scale.1122334455667788AABBCCDDEE© 2026 STORM STATION 247THE FIELD BOOKSTATION REPORT XIFFIG. B THE AIR AT LIBERTY - RAVEN ROCKTHE REPORTED TEMPERATURE AND DEW POINT, AND AIR LIFTED FROM THE STATION WITHOUT MIXING UNTIL IT SATURATES; HEIGHT ABOVE THE STATION TO SCALEFT ABOVE THE STATION01,0002,0003,0004,0005,0006,00040 F50 F60 F70 FSATURATES 2,800 FT ABOVE THE STATION, AT 46.5 FLOWEST CLOUD REPORTED, OVC 4,200 FTTEMPERATURE 61.5 FDEW POINT 49.3 FSPREAD 12.2 FRELATIVE HUMIDITY 64 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 POINTTITLELiberty - Raven Rock, the airSTATION REPORT · ASOS XIFTYPECHARTSCALEHEIGHT TO SCALEREVAS REPORTED SHEET 2 of 6DATE2026-09-27IDSR-XIF-2DRAWN AS linework on paperSOURCES FB-WAT-002, FB-ENG-011, FB-ENG-005

The wind

From the north northwest (340 degrees) at 5 mph: force 2, a light breeze on the Beaufort scale.

Plan of the wind at Liberty - Raven Rock, north up: blowing from 340 degrees, the north northwest, 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 XIFFIG. C THE WIND AT LIBERTY - RAVEN ROCKPLAN, NORTH UP: THE WIND AS REPORTED, AND WHERE IT SITS ON THE BEAUFORT SCALENESWTHE STATIONFROM 340°BEAUFORT FORCELEAST WIND, MPH0CALM01LIGHT AIR12LIGHT BREEZE4NOW, 5 MPH3GENTLE BREEZE84MODERATE BREEZE135FRESH BREEZE196STRONG BREEZE257NEAR GALE328GALE399STRONG GALE4710STORM5511VIOLENT STORM6412HURRICANE FORCE73TITLELiberty - Raven Rock, the windSTATION REPORT · ASOS XIFTYPEPLAN north upSCALENOT TO SCALEREVAS REPORTED SHEET 3 of 6DATE2026-09-27IDSR-XIF-3DRAWN AS linework on paperSOURCES FB-EVT-150, FB-ENG-008, FB-INS-002

The full report of Liberty - Raven Rock, in 6 sheets, each beside the Field Book plates that explain it

-in

Snow on the ground

Elsewhere in Pennsylvania

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

Near Mercersburg

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