The Collinsville 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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85° on Nov. 13, 1964, the hottest reading for this week of the year since 1889. Next is 84° in 1921.
Collinsville’s center stands about 450 ft above sea level. Within three miles the land runs from 340 ft to 550 ft, a difference of 210 ft: rolling country. The highest named summit within 15 miles is Rock Gut Hill, about 640 ft, 14 miles northwest.
Under the town center the state geologic map shows Wilcox formation (sand, clay), from the Eocene, 34 to 56 million years old.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 63×. 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, clay. Age: Eocene, 34 to 56 million years old. About 23 mi of the line.
Claystone, clay. Age: Eocene, 34 to 56 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.
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 Collinsville reaches the Gulf of America by way of Suqualena Creek, Okatibbee Creek, the Chickasawhay, the Pascagoula and the West Pascagoula: about 270 river miles.
160 miles of the trip are on the Chickasawhay.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Collinsville; river miles along the main stem, rounded.
Collinsville has a humid subtropical climate. Summer afternoons average 93° in July; winter nights fall to about 36° in January. About 57 inches of rain fall in a normal year.
On November 14 Collinsville normally reaches 69° and falls to 43°. The record high is 84°, in 1921; the record low 21°, in 1963. The most rain on this date, 2.07 in, fell in 1929.
Normals 1991–2020 and records since 1889 from the Meridian Area threaded record (Meridian Key Field, 13 miles south-southeast, 160 ft lower). NOAA, through RCC-ACIS.
