The Vicksburg 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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9.80 inches of rain fell in two days, the most for this week of the year since records began in 1948. The next wettest, 5.75 inches, fell in 1948.
Vicksburg’s center stands about 240 ft above sea level. Within three miles the land runs from 50 ft to 380 ft, a difference of 330 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 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 56×. 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 13 mi of the line.
Clay. Age: Holocene, less than 12,000 years old. About 5 mi of the line.
Silt, clay. Age: Holocene, less than 12,000 years old. About 4 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 0.3 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 Vicksburg reaches the Gulf of America by way of Hennesseys Bayou and the Mississippi: about 450 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Vicksburg; river miles along the main stem, rounded.
Vicksburg has a humid subtropical climate. Summer afternoons average 93° in July; winter nights fall to about 38° in January. About 53 inches of rain fall in a normal year.
On November 14 Vicksburg normally reaches 68° and falls to 44°. The record high is 85°, in 1955; the record low 20°, in 2013. The most rain on this date, 1.59 in, fell in 1970.
Normals 1991–2020 and records since 1948 from the Tallulah-Vicksburg Area threaded record (Tallulah Vicksburg Regional Airport, 9 miles west, 160 ft lower). NOAA, through RCC-ACIS.
