The Helena-West Helena 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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12° on Nov. 15, 1940, the coldest reading for this week of the year since 1892. Next is 18° in 1986.
Helena-West Helena’s center stands about 200 ft above sea level. Within three miles the land runs from 150 ft to 420 ft, a difference of 270 ft: rolling country. The highest named summit within 15 miles is Morrells Hill, about 380 ft, 9 miles north-northwest.
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.
Silt. Age: Pleistocene, less than 2.6 million years old. About 12 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 11 mi of the line.
Coarse-detrital, fine-detrital. Age: Holocene, less than 12,000 years old. About 0.8 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 Helena-West Helena reaches the Gulf of America by way of Big Creek, the White River and the Mississippi: about 710 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Helena-West Helena; river miles along the main stem, rounded.
Helena-West Helena has a humid subtropical climate. Summer afternoons average 90° in July; winter nights fall to about 32° in January. About 50 inches of rain fall in a normal year.
On November 14 Helena-West Helena normally reaches 62° and falls to 42°. The record high is 85°, in 1955; the record low 18°, in 1986. The most rain on this date, 2.24 in, fell in 1957.
Normals 1991–2020 and records since 1892 at Helena, here. NOAA, through RCC-ACIS.
