The Lucas 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.
Mostly sunny
Mostly sunny; warmer
Mostly sunny
Partly cloudy
Partly cloudy
Partly cloudy
Showers likely
77° on Nov. 13, 1999, the hottest reading for this week of the year since 1935. Next is 75° in 1939.
Lucas’s center stands about 1,080 ft above sea level. Within three miles the land runs from 1,050 ft to 1,110 ft, a difference of 60 ft: nearly flat ground.
Under the town center the state geologic map shows Granitic intrusion, from the Neoarchean, 2.5 to 2.8 billion 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 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.
Conglomerate, sandstone, mudstone. Age: Late Cretaceous, 72 to 100 million years old. About 15 mi of the line.
Mafic-volcanic, hypabyssal. Age: Archean to Paleoproterozoic. About 5 mi of the line.
Gabbroic, dioritic. Age: Archean to Paleoproterozoic. About 3 mi of the line.
Granitic. 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 Lucas reaches the Gulf of America by way of the Yellow Medicine, the Minnesota and the Mississippi: about 2,100 river miles.
Lake on the way: 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 Lucas; river miles along the main stem, rounded.
Lucas has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 4° in January. A normal year brings about 44 inches of snow; with the rain, that comes to about 29 inches of water.
On November 14 Lucas normally reaches 44° and falls to 23°. The record high is 70°, in 1953; the record low −8°, in 1940. The most rain on this date, 0.33 in, fell in 1983.
Normals 1991–2020 and records since 1935 at Marshall, 10 miles southwest. NOAA, through RCC-ACIS.
