The South Mahoning 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.
Chance of showers
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76° on Nov. 11, 2020, the hottest reading for this week of the year since 1943. Next is 73° in 1949.
South Mahoning’s center stands about 1,450 ft above sea level. Within three miles the land runs from 1,160 ft to 1,550 ft, a difference of 390 ft: rolling country. The highest named summit within 15 miles is Kinter Hill, about 2,110 ft, 9 miles east.
Under the town center the state geologic map shows Glenshaw Formation (shale), from the Carboniferous, 299 to 324 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 26×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale. Age: Carboniferous, 299 to 324 million years old. About 17 mi of the line.
Sandstone. Age: Carboniferous, 299 to 324 million years old. About 6 mi of the line.
Shale, clastic. Age: Carboniferous, 299 to 324 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 South Mahoning reaches the Gulf of America by way of North Branch Plum Creek, Plum Creek, Crooked Creek, the Allegheny, the Ohio and the Mississippi: about 2,030 river miles.
970 miles of the trip are on the Ohio.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of South Mahoning; river miles along the main stem, rounded.
South Mahoning has a warm-summer humid continental climate. Summer afternoons average 82° in July; winter nights fall to about 17° in January. A normal year brings about 34 inches of snow; with the rain, that comes to about 46 inches of water.
On November 14 South Mahoning normally reaches 50° and falls to 31°. The record high is 72°, in 1955; the record low 9°, in 1986. The most rain on this date, 1.05 in, fell in 1997.
Normals 1991–2020 and records since 1943 at Putneyville 2 SE Dam, 11 miles northwest, 170 ft lower. NOAA, through RCC-ACIS.
