The Risco 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
Sunny
Sunny
Mostly sunny
Mostly sunny
Mostly sunny
5.19 inches of rain fell in two days, the most for this week of the year since records began in 1960. The next wettest, 4.72 inches, fell in 2011.
Risco’s center stands about 280 ft above sea level. Within three miles the land runs from 270 ft to 280 ft, a difference of 10 ft: nearly flat ground.
Under the town center the state geologic map shows Holocene series (clay, silt, sand), from the Holocene, less than 12,000 years old.
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.
Clay, silt, sand. Age: Holocene, less than 12,000 years old. About 24 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 Risco reaches the Gulf of America by way of the Little River, the Right Hand Chute Little, Iron Mines Creek, the Saint Francis and the Mississippi: about 920 river miles.
690 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Risco; river miles along the main stem, rounded.
Risco has a humid subtropical climate. Summer afternoons average 92° in July; winter nights fall to about 27° in January. About 48 inches of rain fall in a normal year.
On November 14 Risco normally reaches 61° and falls to 39°. The record high is 79°, in 1985; the record low 15°, in 1986. The most rain on this date, 0.63 in, fell in 1970.
Normals 1991–2020 and records since 1960 at Malden Municipal Airport, 10 miles west-northwest. NOAA, through RCC-ACIS.
