The Martinsville 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.
Sunny
Mostly sunny; warmer
Sunny
Partly cloudy
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Mostly sunny
Mostly sunny
5.40 inches of rain fell in two days, the most for this week of the year since records began in 1930. The next wettest, 3.88 inches, fell in 2006.
Martinsville’s center stands about 1,000 ft above sea level. Within three miles the land runs from 690 ft to 1,120 ft, a difference of 430 ft: hilly country. The highest named summit within 15 miles is Fork Mountain, about 1,990 ft, 11 miles north.
Under the town center the state geologic map shows Fork Mountain Formation (mica-schist), from the Neoproterozoic to Cambrian, 487 to 1,000 million years old.
The section below crosses 10 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 23×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Norite. Age: Cambrian, 487 to 542 million years old. About 7 mi of the line.
Mica-schist. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 5 mi of the line.
Amphibolite. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 4 mi of the line.
Granite. Age: Cambrian, 487 to 542 million years old. About 2 mi of the line.
Gneiss. Age: Neoproterozoic, 542 to 1,000 million years old. About 2 mi of the line.
Mica-schist. Age: Neoproterozoic to Cambrian, 487 to 1,000 million 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. 4 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 Martinsville reaches Albemarle Sound and the Atlantic Ocean by way of the Smith, the Dan and the Roanoke: about 310 river miles.
Lake on the way: 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 Martinsville; river miles along the main stem, rounded.
Martinsville has a humid subtropical climate. Summer afternoons average 88° in July; winter nights fall to about 24° in January. A normal year brings about 9 inches of snow; with the rain, that comes to about 47 inches of water.
On November 14 Martinsville normally reaches 61° and falls to 32°. The record high is 79°, in 1999; the record low 16°, in 1976. The most rain on this date, 1.79 in, fell in 1972.
Normals 1991–2020 and records since 1930 at Martinsville Filter Plant, here, 220 ft lower. NOAA, through RCC-ACIS.
