The Dumas 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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18° on Nov. 13, 2019, the coldest reading for this week of the year since 1959. Next is 21° in 1997.
Dumas’s center stands about 170 ft above sea level. Within three miles the land runs from 150 ft to 190 ft, a difference of 40 ft: nearly flat ground.
Under the town center the state geologic map shows Alluvium - Alluvial deposits of local streams or of overbank flow of major streams (coarse-detrital, fine-detrital), from the Holocene, less than 12,000 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.
Coarse-detrital, fine-detrital. Age: Holocene, less than 12,000 years old. About 12 mi of the line.
Coarse-detrital, fine-detrital. Age: Holocene, less than 12,000 years old. About 10 mi of the line.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 1 mi of the line.
Coarse-detrital, fine-detrital. Age: Holocene, less than 12,000 years old. About 0.4 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 Dumas reaches the Gulf of America by way of Cypress Creek, the Boeuf, the Ouachita, the Black River, the Red River, the Atchafalaya and the Lower Atchafalaya: about 430 river miles.
200 miles of the trip are on the Boeuf.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Dumas; river miles along the main stem, rounded.
Dumas has a humid subtropical climate. Summer afternoons average 90° in July; winter nights fall to about 34° in January. About 55 inches of rain fall in a normal year.
On November 14 Dumas normally reaches 63° and falls to 43°. The record high is 84°, in 1964; the record low 18°, in 2019. The most rain on this date, 0.90 in, fell in 2005.
Normals 1991–2020 and records since 1959 at Rohwer 2 NNE, 13 miles east-southeast. NOAA, through RCC-ACIS.
