The Alcolu 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
Sunny; warmer
Sunny
Sunny
Sunny
Mostly sunny
Mostly sunny
3.68 inches of rain fell in two days, the most for this week of the year since records began in 1948. The next wettest, 2.83 inches, fell in 1979.
Alcolu’s center stands about 130 ft above sea level. Within three miles the land runs from 90 ft to 170 ft, a difference of 80 ft: gently rolling country.
Under the town center the state geologic map shows Bear Bluff Formation (sand, limestone), from the Tertiary, 2.6 to 66 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 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.
Sand, limestone. Age: Tertiary, 2.6 to 66 million years old. About 14 mi of the line.
Sand, clay. Age: Pliocene, 2.6 to 5.3 million years old. About 5 mi of the line.
Sand, gravel. Age: Quaternary, less than 2.6 million years old. About 3 mi of the line.
Limestone, sand. Age: Pleistocene, less than 2.6 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.
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 Alcolu reaches the Atlantic Ocean by way of the Pocotaligo and the Black River: about 130 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Alcolu; river miles along the main stem, rounded.
Alcolu has a humid subtropical climate. Summer afternoons average 91° in July; winter nights fall to about 35° in January. About 56 inches of rain fall in a normal year.
On November 14 Alcolu normally reaches 66° and falls to 43°. The record high is 84°, in 1989; the record low 20°, in 1977. The most rain on this date, 0.72 in, fell in 2000.
Normals 1991–2020 and records since 1948 at Manning, 4 miles south-southeast. NOAA, through RCC-ACIS.
