The Grey Forest 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.
Chance of showers
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Mostly cloudy; cooler
Partly cloudy
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23° on Nov. 14, 2018, the coldest reading for this week of the year since 1885. Next is 26° in 1950.
Grey Forest’s center stands about 1,150 ft above sea level. Within three miles the land runs from 1,040 ft to 1,480 ft, a difference of 440 ft: hilly country. The highest named summit within 15 miles is Mount Smith, about 1,900 ft, 7 miles northwest.
Under the town center the state geologic map shows Glen Rose Limestone (limestone, marlstone), from the Early Cretaceous, 100 to 145 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 19×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Limestone, marlstone. Age: Early Cretaceous, 100 to 145 million years old. About 11 mi of the line.
Limestone. Age: Early Cretaceous, 100 to 113 million years old. About 4 mi of the line.
Limestone, carbonate. Age: Late Cretaceous, 66 to 72 million years old. About 4 mi of the line.
Limestone. Age: Late Cretaceous, 66 to 100 million years old. About 3 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 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 Grey Forest reaches the Gulf of America by way of Helotes Creek, Culebra Creek, Leon Creek, the Medina, the San Antonio, the Guadalupe and the South Guadalupe: about 280 river miles.
210 miles of the trip are on the San Antonio.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Grey Forest; river miles along the main stem, rounded.
Grey Forest has a humid subtropical climate. Summer afternoons average 96° in August; winter nights fall to about 41° in January. About 32 inches of rain fall in a normal year.
On November 14 Grey Forest normally reaches 72° and falls to 50°. The record high is 89°, in 1983; the record low 23°, in 2018. The most rain on this date, 1.59 in, fell in 1923.
Normals 1991–2020 and records since 1885 from the San Antonio Area threaded record (San Antonio International Airport, 13 miles east-southeast, 350 ft lower). NOAA, through RCC-ACIS.
