The Roann 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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3.00 inches of rain fell in two days, the most for this week of the year since records began in 1922. The next wettest, 2.10 inches, fell in 1944.
Roann’s center stands about 760 ft above sea level. Within three miles the land runs from 710 ft to 810 ft, a difference of 100 ft: gently rolling country.
Under the town center the state geologic map shows Wabash Formation (limestone, dolostone), from the Silurian, 422 to 445 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.
Limestone, dolostone. Age: Silurian, 422 to 445 million years old. About 21 mi of the line.
Dolostone, limestone. Age: Silurian, 422 to 445 million years old. About 2 mi of the line.
Limestone, dolostone. Age: Devonian, 359 to 422 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 Roann reaches the Gulf of America by way of the Eel, the Wabash, Big Bayou, the Wabash River Old Channel, the Old Channel Wabash, the Ohio and the Mississippi: about 1,480 river miles.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Roann; river miles along the main stem, rounded.
Roann has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 18° in January. A normal year brings about 20 inches of snow; with the rain, that comes to about 40 inches of water.
On November 14 Roann normally reaches 52° and falls to 33°. The record high is 76°, in 1955; the record low 9°, in 1940. The most rain on this date, 1.52 in, fell in 1978.
Normals 1991–2020 and records since 1922 at Wabash, 10 miles south-southeast. NOAA, through RCC-ACIS.
