The Mignon 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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87° on Nov. 14, 2024, the hottest reading for this week of the year since 1950. Next is 84° in 1958.
Mignon’s center stands about 530 ft above sea level. Within three miles the land runs from 450 ft to 790 ft, a difference of 340 ft: rolling country. The highest named summit within 15 miles is Horn Mountain, about 1,920 ft, 13 miles northeast.
Under the town center the state geologic map shows Sylacauga Marble Group; Shelvin Rock Church Formation, from the Cambrian to Ordovician, 445 to 542 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 15×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Phyllite, metaclastic. Age: Silurian to Devonian, 359 to 445 million years old. About 8 mi of the line.
Marble. Age: Cambrian to Ordovician, 445 to 542 million years old. About 6 mi of the line.
Phyllite, slate. Age: Cambrian to Ordovician, 445 to 542 million years old. About 4 mi of the line.
Marble, metasedimentary. Age: Cambrian to Ordovician, 445 to 542 million years old. About 3 mi of the line.
Quartzite, metaconglomerate. Age: Precambrian to Cambrian. About 1 mi of the line.
Shale. Age: Carboniferous, 299 to 324 million years old. About 0.7 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 Mignon reaches Mobile Bay and the Gulf of America by way of Shirtee Creek, Tallaseehatchee Creek, the Coosa, the Alabama and the Mobile: about 460 river miles.
Lake on the way: Lay Lake.
310 miles of the trip are on the Alabama.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Mignon; river miles along the main stem, rounded.
Mignon has a humid subtropical climate. Summer afternoons average 90° in July; winter nights fall to about 31° in January. About 57 inches of rain fall in a normal year, with about 2 inches of snow.
On November 14 Mignon normally reaches 65° and falls to 39°. The record high is 87°, in 2024; the record low 17°, in 2019. The most rain on this date, 1.42 in, fell in 1957.
Normals 1991–2020 and records since 1950 at Sylacauga 4 NE, 4 miles east-northeast. NOAA, through RCC-ACIS.
