The Dallas 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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Mostly sunny; warmer
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4.28 inches of rain fell in two days, the most for this week of the year since records began in 1947. The next wettest, 4.26 inches, fell in 2009.
Dallas’s center stands about 1,030 ft above sea level. Within three miles the land runs from 870 ft to 1,190 ft, a difference of 320 ft: rolling country. The highest named summit within 15 miles is Little Kennesaw Mountain, about 1,630 ft, 15 miles east-northeast.
Under the town center the state geologic map shows Biotite Gneiss/ Amphibolite (biotite-gneiss, amphibolite), from the Precambrian to Paleozoic.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 39×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Biotite-gneiss, amphibolite. Age: Precambrian to Paleozoic. About 9 mi of the line.
Biotite-gneiss. Age: Precambrian to Paleozoic. About 6 mi of the line.
Gneiss, granite. Age: Precambrian to Paleozoic. About 4 mi of the line.
Hornblende-gneiss, amphibolite. Age: Precambrian to Paleozoic. About 4 mi of the line.
Mica-schist. Age: Precambrian to Paleozoic. About 0.7 mi of the line.
Gneiss. Age: Precambrian to Paleozoic. 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 Dallas reaches Mobile Bay and the Gulf of America by way of Weaver Creek, Pumpkinvine Creek, the Etowah, the Coosa, the Alabama and the Mobile: about 710 river miles.
Lake on the way: Lay Lake.
310 miles of the trip are on the Alabama.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Dallas; river miles along the main stem, rounded.
Dallas has a humid subtropical climate. Summer afternoons average 90° in July; winter nights fall to about 31° in January. About 54 inches of rain fall in a normal year, with about 4 inches of snow.
On November 14 Dallas normally reaches 64° and falls to 39°. The record high is 80°, in 1989; the record low 21°, in 1986. The most rain on this date, 2.31 in, fell in 1972.
Normals 1991–2020 and records since 1947 at Dallas 7 NE, 7 miles northeast. NOAA, through RCC-ACIS.
