The Petersburg 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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3.83 inches of rain fell in two days, the most for this week of the year since records began in 1890. The next wettest, 3.35 inches, fell in 1915.
Petersburg’s center stands about 830 ft above sea level. Within three miles the land runs from 720 ft to 1,150 ft, a difference of 430 ft: hilly country. The highest named summit within 15 miles is Stamp Hill, about 1,250 ft, 4 miles northeast.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 35×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Limestone, calcarenite. Age: Ordovician, 445 to 487 million years old. About 11 mi of the line.
Shale, limestone. Age: Ordovician, 445 to 487 million years old. About 8 mi of the line.
Chert. Age: Carboniferous, 324 to 359 million years old. About 5 mi of the line.
Limestone. Age: Ordovician, 445 to 487 million years old. About 0.6 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.
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 Petersburg reaches the Gulf of America by way of Cane Creek, the Elk River, the Tennessee, the Ohio and the Mississippi: about 1,400 river miles.
Lakes on the way: Guntersville Lake, White Lake (historical) and Pickwick Lake.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Petersburg; river miles along the main stem, rounded.
Petersburg has a humid subtropical climate. Summer afternoons average 91° in July; winter nights fall to about 27° in January. About 56 inches of rain fall in a normal year.
On November 14 Petersburg normally reaches 63° and falls to 36°. The record high is 78°, in 1985; the record low 17°, in 1986. The most rain on this date, 2.87 in, fell in 1915.
Normals 1991–2020 and records since 1890 at Lewisburg Experiment Sta, 12 miles northwest. NOAA, through RCC-ACIS.
