The Oma 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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3.26 inches of rain fell in two days, the most for this week of the year since records began in 1987. The next wettest, 1.62 inches, fell in 2005.
Oma’s center stands about 1,790 ft above sea level. Within three miles the land runs from 1,590 ft to 1,770 ft, a difference of 180 ft: gently rolling country.
Under the town center the state geologic map shows Puritan Quartz Monzonite (granodiorite, granite), from the Mesoarchean to Neoarchean, 2.6 to 2.9 billion years old.
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 60×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granite, granodiorite. Age: Mesoarchean to Neoarchean, 2.6 to 2.9 billion years old. About 9 mi of the line.
Basalt. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 5 mi of the line.
Granodiorite, granite. Age: Mesoarchean to Neoarchean, 2.6 to 2.9 billion years old. About 4 mi of the line.
Gneiss, amphibolite. Age: Neoarchean, 2.5 to 2.8 billion years old. About 4 mi of the line.
Gneiss, amphibolite. Age: Paleoarchean, 3.2 to 3.6 billion years old. About 2 mi of the line.
Biotite-schist. Age: Paleoproterozoic, 1.8 to 1.9 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.
Oma straddles the St. Lawrence Divide. Rain on the northwest side runs to Lake Superior; most of the rest goes to the Gulf of America.
From the center of town, a raindrop reaches the Gulf of America by way of Evelyn Creek, the Turtle, the Flambeau, the Chippewa and the Mississippi: about 2,000 river miles. One that lands on the northwest side reaches Lake Superior by way of the Montreal: about 40 river miles. From there it moves on through the Great Lakes, over Niagara Falls and down the St. Lawrence to the Atlantic.
Lakes on the way: Lipp Lake, Lake Wissota and Holcombe Flowage.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Oma; river miles along the main stem, rounded.
Oma has a warm-summer humid continental climate. Summer afternoons average 77° in July; winter nights fall to about 3° in January. A normal year brings about 155 inches of snow; with the rain, that comes to about 37 inches of water.
On November 14 Oma normally reaches 38° and falls to 24°. The record high is 68°, in 1999; the record low 3°, in 2018. The most rain on this date, 0.94 in, fell in 2000.
Normals 1991–2020 and records since 1987 at Hurley, 13 miles north-northwest, 350 ft lower. NOAA, through RCC-ACIS.
