The Iglesia Antigua 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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3.85 inches of rain fell in two days, the most for this week of the year since records began in 1914. The next wettest, 2.51 inches, fell in 2023.
Iglesia Antigua’s center stands about 60 ft above sea level. Within three miles the land runs from 40 ft to 80 ft, a difference of 40 ft: nearly flat ground.
Under the town center the state geologic map shows Alluvium in Rio Grande, subdivided into areas predominantly of clay (silt, clay), from the Holocene, less than 12,000 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.
Silt, sand. Age: Holocene, less than 12,000 years old. About 12 mi of the line.
Silt, clay. Age: Holocene, less than 12,000 years old. About 9 mi of the line.
Sand. Age: Holocene, less than 12,000 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.
A raindrop that lands in Iglesia Antigua reaches the Gulf of America by way of the Arroyo Colorado: about 45 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Iglesia Antigua; river miles along the main stem, rounded.
Iglesia Antigua has a humid subtropical climate. Summer afternoons average 97° in August; winter nights fall to about 50° in January. About 26 inches of rain fall in a normal year.
On November 14 Iglesia Antigua normally reaches 80° and falls to 59°. The record high is 94°, in 1921; the record low 30°, in 2018. The most rain on this date, 1.28 in, fell in 2008.
Normals 1991–2020 and records since 1914 at Weslaco, 11 miles northwest. NOAA, through RCC-ACIS.
