The Sumatra 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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3.68 inches of rain fell in two days, the most for this week of the year since records began in 1901. The next wettest, 3.07 inches, fell in 2010.
Sumatra’s center stands about 40 ft above sea level. Within three miles the land runs from 20 ft to 80 ft, a difference of 60 ft: nearly flat ground.
Under the town center the state geologic map shows Undifferentiated sediments (sand, clay), from the Pleistocene to Holocene, less than 2.6 million years old.
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, clay. Age: Pleistocene to Holocene, less than 2.6 million years old. About 24 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 Sumatra reaches the Gulf of America by way of Black Creek, Owl Creek and the Apalachicola: about 30 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Sumatra; river miles along the main stem, rounded.
Sumatra has a humid subtropical climate. Summer afternoons average 89° in July; winter nights fall to about 40° in January. About 63 inches of rain fall in a normal year.
On November 14 Sumatra normally reaches 72° and falls to 47°. The record high is 85°, in 1964; the record low 24°, in 1968. The most rain on this date, 1.46 in, fell in 2008.
Normals 1991–2020 and records since 1901 at Wewahitchka, 14 miles west-northwest. NOAA, through RCC-ACIS.
