The Pocahontas 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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5.81 inches of rain fell in two days, the most for this week of the year since records began in 1871. The next wettest, 5.63 inches, fell in 2011.
Pocahontas’s center stands about 320 ft above sea level. Within three miles the land runs from 250 ft to 450 ft, a difference of 200 ft: rolling country. The highest named summit within 15 miles is Bald Knob, about 640 ft, 13 miles north-northwest.
Under the town center the state geologic map shows Cotter and Jefferson City Dolomites (dolostone), from the Early Ordovician, 471 to 487 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 47×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Dolostone. Age: Early Ordovician, 471 to 487 million years old. About 11 mi of the line.
Sand. Age: Pleistocene, less than 2.6 million years old. About 6 mi of the line.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 5 mi of the line.
Coarse-detrital, fine-detrital. Age: Holocene, less than 12,000 years old. About 1 mi of the line.
Sandstone, mudstone. Age: Cretaceous, 66 to 145 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 Pocahontas reaches the Gulf of America by way of Marr Creek, the Black River, the White River and the Mississippi: about 970 river miles.
620 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Pocahontas; river miles along the main stem, rounded.
Pocahontas has a humid subtropical climate. Summer afternoons average 90° in July; winter nights fall to about 26° in January. A normal year brings about 6 inches of snow; with the rain, that comes to about 52 inches of water.
On November 14 Pocahontas normally reaches 59° and falls to 37°. The record high is 80°, in 1931; the record low 12°, in 2019. The most rain on this date, 3.81 in, fell in 1957.
Normals 1991–2020 and records since 1871 at Pocahontas 1, here. NOAA, through RCC-ACIS.
