The Hannibal 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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3.07 inches of rain fell in two days, the most for this week of the year since records began in 1975. The next wettest, 1.82 inches, fell in 2003.
Hannibal’s center stands about 730 ft above sea level. Within three miles the land runs from 600 ft to 1,330 ft, a difference of 730 ft: hilly country. The highest named summit within 15 miles is Riggs Knob, about 1,430 ft, 14 miles north-northeast.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 23×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Mudstone, shale, siltstone. Age: Carboniferous to Permian, 252 to 324 million years old. About 12 mi of the line.
Sandstone, siltstone, shale. Age: Carboniferous to Permian, 252 to 324 million years old. About 11 mi of the line.
Shale, siltstone, mudstone. Age: Carboniferous, 299 to 324 million years old. About 0.8 mi of the line.
Fine-detrital, coarse-detrital. Age: Quaternary, less than 2.6 million years old. About 0.6 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 Hannibal reaches the Gulf of America by way of the Ohio and the Mississippi: about 1,820 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 Hannibal; river miles along the main stem, rounded.
Hannibal has a hot-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 21° in January. About 45 inches of rain fall in a normal year.
On November 14 Hannibal normally reaches 54° and falls to 32°. The record high is 74°, in 1989; the record low 13°, in 2019. The most rain on this date, 0.66 in, fell in 1993.
Normals 1991–2020 and records since 1975 at Hannibal Locks And Dam, here, 110 ft lower. NOAA, through RCC-ACIS.
