The Okolona 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
Chance of showers
Chance of showers; warmer
Partly cloudy
Mostly sunny
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15° on Nov. 13, 2019, the coldest reading for this week of the year since 1890. Next is 17° in 1959.
Okolona’s center stands about 400 ft above sea level. Within three miles the land runs from 230 ft to 420 ft, a difference of 190 ft: gently rolling country. The highest named summit within 15 miles is Round Top Mountain, about 700 ft, 13 miles north-northwest.
Under the town center the state geologic map shows Sartoga Chalk (limestone), from the Late Cretaceous, 66 to 100 million years old.
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 37×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Coarse-detrital, fine-detrital. Age: Holocene, less than 12,000 years old. About 5 mi of the line.
Mudstone, sandstone. Age: Late Cretaceous, 66 to 100 million years old. About 4 mi of the line.
Sandstone. Age: Late Cretaceous, 66 to 100 million years old. About 4 mi of the line.
Limestone. Age: Late Cretaceous, 66 to 100 million years old. About 2 mi of the line.
Marlstone, sandstone. Age: Late Cretaceous, 66 to 100 million years old. About 2 mi of the line.
Shale. Age: Carboniferous, 299 to 324 million years old. 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 Okolona reaches the Gulf of America by way of South Fork Terre Noire Creek, Terre Noire Creek, the Little Missouri, the Ouachita, the Black River, the Red River, the Atchafalaya and the Lower Atchafalaya: about 560 river miles.
310 miles of the trip are on the Ouachita.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Okolona; river miles along the main stem, rounded.
Okolona has a humid subtropical climate. Summer afternoons average 92° in July; winter nights fall to about 30° in January. About 57 inches of rain fall in a normal year, with about 3 inches of snow.
On November 14 Okolona normally reaches 64° and falls to 40°. The record high is 84°, in 1955; the record low 15°, in 2019. The most rain on this date, 2.46 in, fell in 1980.
Normals 1991–2020 and records since 1890 at Prescott 2 NNW, 13 miles south-southwest. NOAA, through RCC-ACIS.
