The St. Martin 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.
St. Martin’s center stands about 9 ft above sea level. Within three miles the land runs from 0 ft to 70 ft, a difference of 70 ft: gently rolling country. Open water lies within three miles.
Under the town center the state geologic map shows Coastal deposits (fine-detrital, coarse-detrital), from the Holocene, less than 12,000 years old.
The section below crosses 2 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.
Sand, gravel. Age: Pliocene to Pleistocene, less than 5.3 million years old. About 11 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 5 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.
Rain that falls on St. Martin runs straight into the Gulf of America.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of St. Martin; river miles along the main stem, rounded.
St. Martin 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 St. Martin 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, 13 miles west). NOAA, through RCC-ACIS.
