The Blackburn 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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88° on Nov. 11, 1989, the hottest reading for this week of the year since 1922. Next is 86° in 2016.
Blackburn’s center stands about 800 ft above sea level. Within three miles the land runs from 740 ft to 970 ft, a difference of 230 ft: rolling country. The highest named summit within 15 miles is Reservoir Hill, about 1,010 ft, 7 miles southeast.
Under the town center the state geologic map shows Terrace Deposits (coarse-detrital, fine-detrital), from the Pleistocene, less than 2.6 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 60×. 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, limestone, sandstone. Age: Carboniferous, 299 to 324 million years old. About 8 mi of the line.
Shale, sandstone, limestone. Age: Carboniferous, 299 to 324 million years old. About 7 mi of the line.
Fine-detrital. Age: Holocene, less than 12,000 years old. About 5 mi of the line.
Shale, sandstone. Age: Carboniferous, 299 to 324 million years old. About 3 mi of the line.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 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 Blackburn reaches the Gulf of America by way of the Arkansas and the Mississippi: about 1,140 river miles.
Lakes on the way: Murray Lake and Ozark Lake.
600 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Blackburn; river miles along the main stem, rounded.
Blackburn has a humid subtropical climate. Summer afternoons average 94° in July; winter nights fall to about 24° in January. A normal year brings about 7 inches of snow; with the rain, that comes to about 37 inches of water.
On November 14 Blackburn normally reaches 63° and falls to 36°. The record high is 81°, in 2025; the record low 13°, in 1959. The most rain on this date, 1.85 in, fell in 1978.
Normals 1991–2020 and records since 1922 at Ralston, 12 miles northwest. NOAA, through RCC-ACIS.
