The Elmendorf 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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25° on Nov. 14, 2018, the coldest reading for this week of the year since 1941. Next is 30° in 2008.
Elmendorf’s center stands about 500 ft above sea level. Within three miles the land runs from 420 ft to 560 ft, a difference of 140 ft: gently rolling country. The highest named summit within 15 miles is Rocky Point, about 790 ft, 7 miles east-northeast.
Under the town center the state geologic map shows Wilcox Group, undivided (mudstone), from the Late Paleocene to Early Eocene, 48 to 59 million years old.
The section below crosses 4 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.
Sandstone. Age: Eocene, 34 to 56 million years old. About 11 mi of the line.
Mudstone. Age: Late Paleocene to Early Eocene, 48 to 59 million years old. About 11 mi of the line.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 2 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 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 Elmendorf reaches the Gulf of America by way of the San Antonio, the Guadalupe and the South Guadalupe: about 210 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Elmendorf; river miles along the main stem, rounded.
Elmendorf has a humid subtropical climate. Summer afternoons average 97° in August; winter nights fall to about 42° in January. About 30 inches of rain fall in a normal year.
Normals 1991–2020 and records since 1941 at San Antonio Stinson Municipal Airport, 10 miles northwest. NOAA, through RCC-ACIS.
