The Ardmore 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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17° on Nov. 12, 2019, the coldest reading for this week of the year since 1941. Next is 20° in 1997.
Ardmore’s center stands about 890 ft above sea level. Within three miles the land runs from 630 ft to 940 ft, a difference of 310 ft: rolling country. The highest named summit within 15 miles is Capshaw Mountain, about 1,280 ft, 13 miles south-southeast.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 48×. 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, siltstone. Age: Carboniferous, 324 to 359 million years old. About 12 mi of the line.
Shale, limestone. Age: Ordovician, 445 to 487 million years old. About 6 mi of the line.
Limestone, calcarenite. Age: Ordovician, 445 to 487 million years old. About 3 mi of the line.
Chert. Age: Carboniferous, 324 to 359 million years old. About 3 mi of the line.
Fine-detrital, coarse-detrital. Age: Quaternary, less than 2.6 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 Ardmore reaches the Gulf of America by way of Piney Creek, Limestone Creek, the Tennessee, the Ohio and the Mississippi: about 1,370 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 Ardmore; river miles along the main stem, rounded.
Ardmore has a humid subtropical climate. Summer afternoons average 90° in July; winter nights fall to about 33° in January. About 59 inches of rain fall in a normal year, with about 1 inch of snow.
On November 14 Ardmore normally reaches 63° and falls to 42°. The record high is 77°, in 2011; the record low 22°, in 2014. The most rain on this date, 1.97 in, fell in 2005.
Normals 1991–2020 and records since 1941 at Athens, 16 miles south-southwest, 200 ft lower. NOAA, through RCC-ACIS.
