The Walnut Grove 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
Partly cloudy; warmer
Mostly sunny
Sunny
Sunny
Partly cloudy
Mostly sunny
82° on Nov. 15, 1955, the hottest reading for this week of the year since 1894. Next is 82° in 2005.
Walnut Grove’s center stands about 860 ft above sea level. Within three miles the land runs from 820 ft to 1,310 ft, a difference of 490 ft: hilly country. The highest named summit within 15 miles is Chandler Mountain, about 1,500 ft, 10 miles south.
Under the town center the state geologic map shows Chickamauga Limestone, from the Ordovician, 445 to 487 million years old.
The section below crosses 13 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 20×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone. Age: Carboniferous, 299 to 324 million years old. About 10 mi of the line.
Sandstone, conglomerate. Age: Carboniferous, 299 to 324 million years old. About 5 mi of the line.
Limestone, shale. Age: Cambrian, 487 to 542 million years old. About 2 mi of the line.
Dolostone, limestone. Age: Cambrian to Ordovician, 445 to 542 million years old. About 1 mi of the line.
Dolostone, limestone. Age: Cambrian to Ordovician, 445 to 542 million years old. About 1 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 1 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 7 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 Walnut Grove reaches Mobile Bay and the Gulf of America by way of the Locust Fork, the Black Warrior, the Tombigbee and the Mobile: about 530 river miles.
170 miles of the trip are on the Tombigbee.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Walnut Grove; river miles along the main stem, rounded.
Walnut Grove has a humid subtropical climate. Summer afternoons average 91° in July; winter nights fall to about 33° in January. About 57 inches of rain fall in a normal year.
On November 14 Walnut Grove normally reaches 65° and falls to 41°. The record high is 79°, in 1959; the record low 17°, in 1907. The most rain on this date, 2.25 in, fell in 1957.
Normals 1991–2020 and records since 1894 at Oneonta, 12 miles southwest, 240 ft higher. NOAA, through RCC-ACIS.
