The Alcorn State University 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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7.72 inches of rain fell in two days, the most for this week of the year since records began in 1893. The next wettest, 5.37 inches, fell in 1929.
Alcorn State University’s center stands about 260 ft above sea level. Within three miles the land runs from 160 ft to 410 ft, a difference of 250 ft: rolling country.
Under the town center the state geologic map shows Catahoula formation (sand), from the Miocene, 5.3 to 23 million years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 50×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sand. Age: Miocene, 5.3 to 23 million years old. About 16 mi of the line.
Silt, clay. Age: Holocene, less than 12,000 years old. About 5 mi of the line.
Clay. Age: Holocene, less than 12,000 years old. About 3 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 Alcorn State University reaches the Gulf of America by way of Judy Bayou, Cool Boiler Bayou, Dowd Creek and the Mississippi: about 420 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Alcorn State University; river miles along the main stem, rounded.
Alcorn State University has a humid subtropical climate. Summer afternoons average 93° in July; winter nights fall to about 36° in January. About 56 inches of rain fall in a normal year.
On November 14 Alcorn State University normally reaches 69° and falls to 43°. The record high is 89°, in 1921; the record low 20°, in 1907. The most rain on this date, 2.93 in, fell in 1957.
Normals 1991–2020 and records since 1893 at Port Gibson 1 NE, 12 miles northeast, 140 ft lower. NOAA, through RCC-ACIS.
