The Avard 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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87° on Nov. 17, 2016, the hottest reading for this week of the year since 1938. Next is 86° in 1989.
Avard’s center stands about 1,480 ft above sea level. Within three miles the land runs from 1,440 ft to 1,560 ft, a difference of 120 ft: gently rolling country.
Under the town center the state geologic map shows Flowerpot Shale (shale, siltstone), from the Permian, 252 to 299 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 43×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 12 mi of the line.
Shale, siltstone. Age: Permian, 252 to 299 million years old. About 8 mi of the line.
Gypsum, dolostone, shale. Age: Permian, 252 to 299 million years old. About 3 mi of the line.
Shale. Age: Permian, 252 to 299 million years old. About 1 mi of the line.
Sandstone. Age: Permian, 252 to 299 million years old. About 0.3 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 Avard reaches the Gulf of America by way of Eagle Chief Creek, the Cimarron, the Arkansas and the Mississippi: about 1,360 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 Avard; river miles along the main stem, rounded.
Avard has a humid subtropical climate. Summer afternoons average 96° in July; winter nights fall to about 22° in January. A normal year brings about 9 inches of snow; with the rain, that comes to about 28 inches of water.
On November 14 Avard normally reaches 61° and falls to 34°. The record high is 85°, in 1999; the record low 8°, in 1959. The most rain on this date, 0.48 in, fell in 2003.
Normals 1991–2020 and records since 1938 at Waynoka, 10 miles south-southwest. NOAA, through RCC-ACIS.
