The Walhalla 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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4.96 inches of rain fell in two days, the most for this week of the year since records began in 1896. The next wettest, 3.56 inches, fell in 1935.
Walhalla’s center stands about 1,020 ft above sea level. Within three miles the land runs from 840 ft to 1,130 ft, a difference of 290 ft: rolling country. The highest named summit within 15 miles is Medlin Mountain, about 3,200 ft, 15 miles north.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 13×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Hornblende-gneiss, amphibolite. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 8 mi of the line.
Biotite-gneiss, mica-schist. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 5 mi of the line.
Metasedimentary. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 5 mi of the line.
Biotite-gneiss. Age: Neoproterozoic, 542 to 1,000 million years old. About 3 mi of the line.
Gneiss. Age: Ordovician to Silurian, 422 to 487 million years old. About 2 mi of the line.
Gneiss. Age: Silurian to Devonian, 359 to 445 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. 1 smaller unit 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 Walhalla reaches the Atlantic Ocean by way of Cane Creek, the Seneca, Little Beaverdam Creek and the Savannah: about 350 river miles.
290 miles of the trip are on the Savannah.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Walhalla; river miles along the main stem, rounded.
Walhalla has a humid subtropical climate. Summer afternoons average 89° in July; winter nights fall to about 29° in January. About 61 inches of rain fall in a normal year, with about 2 inches of snow.
On November 14 Walhalla normally reaches 62° and falls to 37°. The record high is 82°, in 1999; the record low 19°, in 2013. The most rain on this date, 1.40 in, fell in 1961.
Normals 1991–2020 and records since 1896 at Walhalla, here. NOAA, through RCC-ACIS.
