The Ali Chuk 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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97° on Nov. 15, 1999, the hottest reading for this week of the year since 1944. Next is 95° in 2013.
Ali Chuk’s center stands about 1,740 ft above sea level. Within three miles the land runs from 1,660 ft to 2,600 ft, a difference of 940 ft: steep hill country. The highest named summit within 15 miles is Diaz Peak, about 3,820 ft, 12 miles north-northwest.
Under the town center the state geologic map shows Quaternary surficial deposits, undivided (sand, silt, clay), from the Pleistocene to Holocene, less than 2 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 12×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Gravel, sand. Age: Late Pliocene to Pleistocene, 0.8 to 3 million years old. About 5 mi of the line.
Basalt, andesite, dacite. Age: Middle Eocene to Late Miocene, 11 to 38 million years old. About 5 mi of the line.
Sand, silt, clay. Age: Pleistocene to Holocene, less than 2 million years old. About 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.
Ali Chuk has a hot desert climate. Summer afternoons average 104° in July; winter nights fall to about 41° in December. About 9 inches of rain fall in a normal year.
On November 14 Ali Chuk normally reaches 80° and falls to 48°. The record high is 96°, in 1999; the record low 34°, in 2000. The most rain on this date, 0.40 in, fell in 1978.
Normals 1991–2020 and records since 1944 at Organ Pipe Cactus Nm, 17 miles northwest. NOAA, through RCC-ACIS.
