The Grady 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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87° on Nov. 13, 1955, the hottest reading for this week of the year since 1884. Next is 84° in 1941.
Grady’s center stands about 190 ft above sea level. Within three miles the land runs from 170 ft to 210 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 7 mi of the line.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 3 mi of the line.
Marl. Age: Late Eocene, 34 to 38 million years old. About 1 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 Grady reaches the Gulf of America by way of Cypress Creek, Boggy Bayou, Clay Bayou, the Bayou Macon, the Tensas, the Black River, the Red River, the Atchafalaya and the Lower Atchafalaya: about 520 river miles.
200 miles of the trip are on the Bayou Macon.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Grady; river miles along the main stem, rounded.
Grady has a humid subtropical climate. Summer afternoons average 92° in July; winter nights fall to about 34° in January. About 51 inches of rain fall in a normal year.
On November 14 Grady normally reaches 63° and falls to 42°. The record high is 87°, in 1955; the record low 19°, in 1907. The most rain on this date, 2.45 in, fell in 1922.
Normals 1991–2020 and records since 1884 from the Pine Bluff Area threaded record (Pine Bluff Grider Field, 15 miles west-northwest). NOAA, through RCC-ACIS.
