The Lyman 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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7.80 inches of rain fell in two days, the most for this week of the year since records began in 1893. The next wettest, 5.75 inches, fell in 1993.
Lyman’s center stands about 80 ft above sea level. Within three miles the land runs from 40 ft to 140 ft, a difference of 100 ft: gently rolling country.
Under the town center the state geologic map shows Citronelle formation (sand, gravel), from the Pliocene to Pleistocene, less than 5.3 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, sand. Age: Miocene, 5.3 to 23 million years old. About 9 mi of the line.
Sand, gravel. Age: Pliocene to Pleistocene, less than 5.3 million years old. About 7 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 6 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 Lyman reaches the Gulf of America by way of the Little Biloxi and the Biloxi: about 20 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lyman; river miles along the main stem, rounded.
Lyman has a humid subtropical climate. Summer afternoons average 91° in August; winter nights fall to about 42° in January. About 63 inches of rain fall in a normal year.
On November 14 Lyman normally reaches 70° and falls to 49°. The record high is 82°, in 1915; the record low 29°, in 1920. The most rain on this date, 4.60 in, fell in 1961.
Normals 1991–2020 and records since 1893 from the Gulfport Area threaded record (Gulfport - Biloxi Airport, 6 miles south-southeast). NOAA, through RCC-ACIS.
