The Lisbon 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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17° on Nov. 13, 2019, the coldest reading for this week of the year since 1893. Next is 22° in 1970.
Lisbon’s center stands about 320 ft above sea level. Within three miles the land runs from 210 ft to 370 ft, a difference of 160 ft: gently rolling country.
Under the town center the state geologic map shows Cockfield Formation (clay, silt, sand), from the Eocene, 34 to 56 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.
Clay, marl. Age: Eocene, 34 to 56 million years old. About 13 mi of the line.
Clay, silt, sand. Age: Eocene, 34 to 56 million years old. About 7 mi of the line.
Clay. Age: Holocene, less than 12,000 years old. About 4 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 Lisbon reaches the Gulf of America by way of Bullock Creek, the Bayou D'Arbonne, the Ouachita, the Black River, the Red River, the Atchafalaya and the Lower Atchafalaya: about 420 river miles.
Lake on the way: Bayou D'Arbonne Lake.
130 miles of the trip are on the Ouachita.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lisbon; river miles along the main stem, rounded.
Lisbon has a humid subtropical climate. Summer afternoons average 92° in July; winter nights fall to about 32° in January. About 57 inches of rain fall in a normal year.
On November 14 Lisbon normally reaches 66° and falls to 41°. The record high is 84°, in 1955; the record low 22°, in 2019. The most rain on this date, 1.68 in, fell in 1970.
Normals 1991–2020 and records since 1893 at Homer 1 N, 11 miles west, 100 ft lower. NOAA, through RCC-ACIS.
