The Udall 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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84° on Nov. 16, 2016, the hottest reading for this week of the year since 1996. Next is 80° in 2005.
Udall’s center stands about 1,280 ft above sea level. Within three miles the land runs from 1,180 ft to 1,290 ft, a difference of 110 ft: gently rolling country.
Under the town center the state geologic map shows Sumner Group (shale), from the Permian, 252 to 299 million years old.
The section below crosses 3 rock units mapped at the surface.
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: Permian, 252 to 299 million years old. About 14 mi of the line.
Silt. Age: Pleistocene to Holocene, less than 2.6 million years old. About 8 mi of the line.
Shale, limestone. Age: Permian, 252 to 299 million years old. About 2 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 Udall reaches the Gulf of America by way of Stewart Creek, the Walnut, the Arkansas and the Mississippi: about 1,300 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 Udall; river miles along the main stem, rounded.
Udall has a humid subtropical climate. Summer afternoons average 92° in July; winter nights fall to about 24° in January. About 35 inches of rain fall in a normal year.
On November 14 Udall normally reaches 59° and falls to 36°. The record high is 76°, in 2020; the record low 16°, in 2018. The most rain on this date, 0.49 in, fell in 2022.
Normals 1991–2020 and records since 1996 at Winfield Strother Field Airport, 16 miles south-southeast, 130 ft lower. NOAA, through RCC-ACIS.
