The Walpack plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.
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3.42 inches of rain fell in two days, the most for this week of the year since records began in 1910. The next wettest, 2.83 inches, fell in 1970.
Walpack’s center stands about 1,310 ft above sea level. Within three miles the land runs from 340 ft to 1,520 ft, a difference of 1,180 ft: steep hill country. The highest named summit within 15 miles is Sunrise Mountain, about 1,630 ft, 11 miles northeast.
Under the town center the state geologic map shows Shawangunk Formation (sandstone, conglomerate), from the Silurian, 428 to 445 million years old.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 15×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Graywacke, siltstone. Age: Middle Ordovician to Late Ordovician, 445 to 471 million years old. About 10 mi of the line.
Black-shale. Age: Early Devonian to Middle Devonian, 384 to 422 million years old. About 5 mi of the line.
Sandstone, conglomerate. Age: Silurian, 428 to 445 million years old. About 4 mi of the line.
Siltstone, sandstone. Age: Silurian, 422 to 428 million years old. About 2 mi of the line.
Limestone. Age: Early Devonian to Middle Devonian, 384 to 422 million years old. About 2 mi of the line.
Siltstone. Age: Early Devonian, 394 to 422 million years old. About 1 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 2 smaller units along the line are not listed.
Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.
A raindrop that lands in Walpack reaches Delaware Bay and the Atlantic Ocean by way of Flat Brook and the Delaware: about 200 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Walpack; river miles along the main stem, rounded.
Walpack has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 19° in January. A normal year brings about 42 inches of snow; with the rain, that comes to about 54 inches of water.
On November 14 Walpack normally reaches 52° and falls to 32°. The record high is 72°, in 1931; the record low 11°, in 1986. The most rain on this date, 1.83 in, fell in 1972.
Normals 1991–2020 and records since 1910 at East Stroudsburg, 18 miles west-southwest, 840 ft lower. NOAA, through RCC-ACIS.
