The Blue Ridge 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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4.37 inches of rain fell in two days, the most for this week of the year since records began in 1912. The next wettest, 4.32 inches, fell in 2020.
Blue Ridge’s center stands about 1,300 ft above sea level. Within three miles the land runs from 1,110 ft to 2,470 ft, a difference of 1,360 ft: steep hill country. The highest named summit within 15 miles is Flat Top Mountain, about 3,960 ft, 13 miles east-northeast.
Under the town center the state geologic map shows Conococheague Formation (limestone), from the Cambrian, 487 to 542 million years old.
The section below crosses 14 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 11×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granulite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 5 mi of the line.
Shale. Age: Cambrian, 487 to 542 million years old. About 3 mi of the line.
Shale. Age: Ordovician, 445 to 487 million years old. About 3 mi of the line.
Granulite, gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 2 mi of the line.
Quartzite, conglomerate, sandstone. Age: Cambrian, 487 to 542 million years old. About 2 mi of the line.
Biotite-gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 8 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 Blue Ridge reaches Albemarle Sound and the Atlantic Ocean by way of Glade Creek and the Roanoke: about 360 river miles.
Lakes on the way: Smith Mountain Lake and Roanoke Rapids Lake.
130 miles of the trip are on the Roanoke.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Blue Ridge; river miles along the main stem, rounded.
Blue Ridge has a humid subtropical climate. Summer afternoons average 88° in July; winter nights fall to about 29° in January. A normal year brings about 15 inches of snow; with the rain, that comes to about 43 inches of water.
On November 14 Blue Ridge normally reaches 60° and falls to 38°. The record high is 82°, in 1993; the record low 13°, in 1986. The most rain on this date, 1.68 in, fell in 1972.
Normals 1991–2020 and records since 1912 from the Roanoke Area threaded record (Roanoke-Blacksburg Regional Airport, 10 miles west-southwest, 160 ft lower). NOAA, through RCC-ACIS.
