The Ponemah 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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65° on Nov. 15, 2025, the hottest reading for this week of the year since 1943. Next is 64° in 1981.
Ponemah’s center stands about 1,190 ft above sea level. Within three miles the land runs from 1,160 ft to 1,410 ft, a difference of 250 ft: rolling country.
Under the town center the state geologic map shows Gabbro, peridotite, pyroxenite, lamprophyre, and metamorphic equivalents, from the Neoarchean, 2.5 to 2.8 billion years old.
The section below crosses 5 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.
Biotite-schist, migmatite. Age: Neoarchean, 2.5 to 2.8 billion years old. About 9 mi of the line.
Granitic. Age: Neoarchean, 2.5 to 2.8 billion years old. About 8 mi of the line.
Gabbro, peridotite, pyroxenite. Age: Neoarchean, 2.5 to 2.8 billion years old. About 3 mi of the line.
Felsic-volcanic. Age: Neoarchean, 2.5 to 2.8 billion years old. About 3 mi of the line.
Migmatite. Age: Neoarchean, 2.5 to 2.8 billion years old. About 1 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 Ponemah reaches Hudson Bay by way of Upper Red Lake, the Red Lake, the Red River of the North and the Nelson: about 1,150 river miles. Past the border it runs north through Canada to Hudson Bay.
Lakes on the way: Upper Red Lake and Lake Winnipeg.
400 miles of the trip are on the Nelson.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Ponemah; river miles along the main stem, rounded.
Ponemah has a warm-summer humid continental climate. Summer afternoons average 77° in July; winter nights fall to about −3° in January. About 23 inches of rain fall in a normal year.
On November 14 Ponemah normally reaches 35° and falls to 21°. The record high is 64°, in 2016; the record low −11°, in 1959. The most rain on this date, 0.81 in, fell in 1944.
Normals 1991–2020 and records since 1943 at Red Lake Indian Agcy, 11 miles south-southwest. NOAA, through RCC-ACIS.
