The Point Isabel 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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1° on Nov. 13, 2019, the coldest reading for this week of the year since 1893. Next is 5° in 1959.
Point Isabel’s center stands about 880 ft above sea level. Within three miles the land runs from 850 ft to 890 ft, a difference of 40 ft: nearly flat ground.
Under the town center the state geologic map shows Wabash Formation (limestone, dolostone), from the Silurian, 422 to 445 million years old.
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 24 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 Point Isabel reaches the Gulf of America by way of Wildcat Creek, Big Bayou, the Wabash River Old Channel, the Old Channel Wabash, the Ohio and the Mississippi: about 1,490 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 Point Isabel; river miles along the main stem, rounded.
Point Isabel has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 18° in January. A normal year brings about 24 inches of snow; with the rain, that comes to about 42 inches of water.
On November 14 Point Isabel normally reaches 50° and falls to 32°. The record high is 74°, in 1931; the record low 10°, in 1986. The most rain on this date, 1.63 in, fell in 1972.
Normals 1991–2020 and records since 1893 at Marion 2 N, 14 miles northeast. NOAA, through RCC-ACIS.
