The Twin Brooks 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.
Sunny
Mostly sunny; warmer
Mostly sunny
Partly cloudy
Partly cloudy
Partly cloudy; cooler
Showers likely
70° on Nov. 16, 2001, the hottest reading for this week of the year since 1956. Next is 67° in 1999.
Twin Brooks’s center stands about 1,260 ft above sea level. Within three miles the land runs from 1,190 ft to 1,520 ft, a difference of 330 ft: rolling country. The highest named summit within 15 miles is Punished Womans Mound, about 2,060 ft, 12 miles southwest.
Under the town center the state geologic map shows Carlile Shale, from the Late Cretaceous, 66 to 100 million 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 20×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale. Age: Late Cretaceous, 66 to 100 million years old. About 17 mi of the line.
Shale, bentonite. Age: Late Cretaceous, 66 to 100 million years old. About 6 mi of the line.
Granite. Age: Neoarchean, 2.5 to 2.8 billion years old. About 0.7 mi of the line.
Chalk, marlstone, shale. Age: Late Cretaceous, 66 to 100 million years old. 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 Twin Brooks reaches the Gulf of America by way of the South Fork Whetstone, the Whetstone, the Minnesota and the Mississippi: about 2,180 river miles.
Lakes on the way: Big Stone Lake and Lake Pepin.
1,750 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Twin Brooks; river miles along the main stem, rounded.
Twin Brooks has a warm-summer humid continental climate. Summer afternoons average 82° in July; winter nights fall to about 2° in January. A normal year brings about 59 inches of snow; with the rain, that comes to about 26 inches of water.
On November 14 Twin Brooks normally reaches 40° and falls to 21°. The record high is 66°, in 1990; the record low −15°, in 1959. The most rain on this date, 0.38 in, fell in 1997.
Normals 1991–2020 and records since 1956 at Summit 1 W, 15 miles west-northwest, 700 ft higher. NOAA, through RCC-ACIS.
