The Smyrna 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
Mostly sunny
Sunny
Mostly sunny
Mostly sunny
Mostly sunny
82° on Nov. 16, 1958, the hottest reading for this week of the year since 1878. Next is 81° in 1985.
Smyrna’s center stands about 1,070 ft above sea level. Within three miles the land runs from 900 ft to 1,110 ft, a difference of 210 ft: rolling country. The highest named summit within 15 miles is Kennesaw Mountain, about 1,780 ft, 7 miles north-northwest.
Under the town center the state geologic map shows Mica Schist/ Gneiss/ Amphibolite (gneiss, mica-schist, amphibolite), from the Precambrian to Paleozoic.
The section below crosses 11 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 28×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Amphibolite, mica-schist, biotite-gneiss. Age: Precambrian to Paleozoic. About 6 mi of the line.
Amphibolite, biotite-gneiss, mica-schist. Age: Precambrian to Paleozoic. About 6 mi of the line.
Mica-schist. Age: Precambrian to Paleozoic. About 3 mi of the line.
Biotite-gneiss. Age: Precambrian to Paleozoic. About 3 mi of the line.
Gneiss, mica-schist, amphibolite. Age: Precambrian to Paleozoic. About 2 mi of the line.
Biotite-gneiss. Age: Precambrian to Paleozoic. 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. 5 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 Smyrna reaches the Gulf of America by way of Nickajack Creek, the Chattahoochee and the Apalachicola: about 410 river miles.
Lakes on the way: Walter F George Reservoir, West Point Lake and Bartletts Ferry Lake.
110 miles of the trip are on the Apalachicola.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Smyrna; river miles along the main stem, rounded.
Smyrna has a humid subtropical climate. Summer afternoons average 90° in July; winter nights fall to about 36° in January. About 50 inches of rain fall in a normal year, with about 2 inches of snow.
On November 14 Smyrna normally reaches 64° and falls to 44°. The record high is 80°, in 1955; the record low 22°, in 1969. The most rain on this date, 1.80 in, fell in 1888.
Normals 1991–2020 and records since 1878 from the Atlanta Area threaded record (Atlanta Hartsfield-Jackson International Airport, 18 miles south-southeast). NOAA, through RCC-ACIS.
