The Anna 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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78° on Nov. 11, 2020, the hottest reading for this week of the year since 1948. Next is 72° in 2010.
Anna’s center stands about 1,030 ft above sea level. Within three miles the land runs from 970 ft to 1,080 ft, a difference of 110 ft: gently rolling country.
Under the town center the state geologic map shows Cincinnati Group as used by Wickstrom (1990) (shale, dolostone, limestone), from the Ordovician, 445 to 487 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.
Shale, dolostone, limestone. Age: Ordovician, 445 to 487 million years old. About 13 mi of the line.
Dolostone. Age: Silurian, 425 to 445 million years old. About 8 mi of the line.
Dolostone, limestone, shale. Age: Silurian, 422 to 445 million years old. About 3 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 Anna reaches the Gulf of America by way of Clay Creek, Loramie Creek, the Great Miami, the Ohio and the Mississippi: about 1,610 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 Anna; river miles along the main stem, rounded.
Anna has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 18° in January. About 42 inches of rain fall in a normal year.
On November 14 Anna normally reaches 52° and falls to 32°. The record high is 71°, in 1989; the record low 2°, in 2019. The most rain on this date, 1.93 in, fell in 1972.
Normals 1991–2020 and records since 1948 at Sidney 1 S, 9 miles south. NOAA, through RCC-ACIS.
