The Sullivan 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.
Sunny
Mostly sunny; warmer
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Partly cloudy
Mostly sunny
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3.63 inches of rain fell in two days, the most for this week of the year since records began in 1904. The next wettest, 3.36 inches, fell in 1942.
Sullivan’s center stands about 680 ft above sea level. Within three miles the land runs from 600 ft to 690 ft, a difference of 90 ft: gently rolling country.
Under the town center the state geologic map shows Mattoon Formation (shale), from the Late Pennsylvanian, 304 to 307 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.
Shale. Age: Late Pennsylvanian, 304 to 307 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 Sullivan reaches the Gulf of America by way of Asa Creek, the Kaskaskia and the Mississippi: about 1,310 river miles.
Lakes on the way: Carlyle Reservoir and Lake Shelbyville.
1,090 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Sullivan; river miles along the main stem, rounded.
Sullivan has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 19° in January. A normal year brings about 14 inches of snow; with the rain, that comes to about 41 inches of water.
On November 14 Sullivan normally reaches 52° and falls to 34°. The record high is 76°, in 1971; the record low 9°, in 2019. The most rain on this date, 2.62 in, fell in 1993.
Normals 1991–2020 and records since 1904 at Windsor, 10 miles south. NOAA, through RCC-ACIS.
