The Pontiac 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.
Mostly sunny
Partly cloudy; warmer
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Partly cloudy
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4.18 inches of rain fell in two days, the most for this week of the year since records began in 1902. The next wettest, 3.23 inches, fell in 1993.
Pontiac’s center stands about 800 ft above sea level. Within three miles the land runs from 650 ft to 1,020 ft, a difference of 370 ft: rolling country. The highest named summit within 15 miles is Timber Knob, about 1,440 ft, 15 miles north-northeast.
Under the town center the state geologic map shows Smithville Dolomite, Powell Dolomite, Cotter Dolomite, Jefferson City Dolomite (dolostone), from the Early Ordovician, 471 to 487 million years old.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 33×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Dolostone. Age: Early Ordovician, 471 to 487 million years old. About 16 mi of the line.
Dolostone. Age: Early Ordovician, 471 to 487 million years old. About 8 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 Pontiac reaches the Gulf of America by way of the White River and the Mississippi: about 1,050 river miles.
620 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Pontiac; river miles along the main stem, rounded.
Pontiac has a humid subtropical climate. Summer afternoons average 89° in July; winter nights fall to about 26° in January. A normal year brings about 8 inches of snow; with the rain, that comes to about 51 inches of water.
On November 14 Pontiac normally reaches 59° and falls to 38°. The record high is 83°, in 1999; the record low 11°, in 1940. The most rain on this date, 2.60 in, fell in 1926.
Normals 1991–2020 and records since 1902 at Mountain Home 1 NNW, 17 miles southeast. NOAA, through RCC-ACIS.
