The Ambrose 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.
Partly cloudy
Partly cloudy
Partly cloudy
Mostly cloudy
Chance of showers; cooler
Mostly cloudy
Mostly cloudy
−14° on Nov. 12, 2022, the coldest reading for this week of the year since 1963. Next is −11° in 1995.
Ambrose’s center stands about 2,060 ft above sea level. Within three miles the land runs from 1,980 ft to 2,230 ft, a difference of 250 ft: rolling country.
Under the town center the state geologic map shows Bullion Creek Formation (claystone, siltstone), from the Paleocene, 56 to 66 million years old.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 43×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Claystone, siltstone. Age: Paleocene, 56 to 66 million years old. About 8 mi of the line.
Siltstone, claystone, sandstone. Age: Paleocene, 56 to 66 million years old. About 7 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 Ambrose reaches Hudson Bay by way of the Souris, the Assiniboine, the Red River of the North and the Nelson: about 1,350 river miles. Past the border it runs north through Canada to Hudson Bay.
Lakes on the way: Lake Darling and Lake Winnipeg.
400 miles of the trip are on the Souris.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Ambrose; river miles along the main stem, rounded.
Ambrose has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about −3° in January. A normal year brings about 36 inches of snow; with the rain, that comes to about 15 inches of water.
On November 14 Ambrose normally reaches 35° and falls to 15°. The record high is 60°, in 1990; the record low −9°, in 2000. The most rain on this date, 0.22 in, fell in 1964.
Normals 1991–2020 and records since 1963 at Fortuna 1 W, 15 miles west-southwest, 290 ft higher. NOAA, through RCC-ACIS.
