The Harrell 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.
Partly cloudy
Partly cloudy; warmer
Mostly sunny
Sunny
Mostly sunny
Mostly sunny
Mostly sunny
19° on Nov. 13, 2019, the coldest reading for this week of the year since 1940. Next is 20° in 1963.
Harrell’s center stands about 210 ft above sea level. Within three miles the land runs from 160 ft to 260 ft, a difference of 100 ft: gently rolling country.
Under the town center the state geologic map shows Terrace deposits (coarse-detrital, fine-detrital), from the Pleistocene, less than 2.6 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 64×. 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: Pleistocene, less than 2.6 million years old. About 21 mi of the line.
Coarse-detrital, fine-detrital. Age: Holocene, less than 12,000 years old. About 2 mi of the line.
Sand, clay. Age: Middle Eocene, 38 to 48 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 Harrell reaches the Gulf of America by way of Spring Branch, Lloyd Creek, the Ouachita, the Black River, the Red River, the Atchafalaya and the Lower Atchafalaya: about 460 river miles.
230 miles of the trip are on the Ouachita.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Harrell; river miles along the main stem, rounded.
Harrell has a humid subtropical climate. Summer afternoons average 93° in July; winter nights fall to about 32° in January. About 50 inches of rain fall in a normal year.
On November 14 Harrell normally reaches 66° and falls to 41°. The record high is 83°, in 1971; the record low 19°, in 2019. The most rain on this date, 3.02 in, fell in 1957.
Normals 1991–2020 and records since 1940 at Calion Lock & Dam, 15 miles south-southwest, 120 ft lower. NOAA, through RCC-ACIS.
