The Hay Brook 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
Mostly sunny; warmer
Partly cloudy
Partly cloudy
Chance of showers
Partly cloudy
Showers likely
72° on Nov. 14, 1999, the hottest reading for this week of the year since 1904. Next is 70° in 1953.
Hay Brook’s center stands about 1,240 ft above sea level. Within three miles the land runs from 1,180 ft to 1,320 ft, a difference of 140 ft: gently rolling country.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 53×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granodiorite, granite. Age: Paleoproterozoic, 1.6 to 1.8 billion years old. About 16 mi of the line.
Sandstone, siltstone. Age: Mesoproterozoic, 1 to 1.2 billion years old. About 6 mi of the line.
Age: Paleoproterozoic, 1.8 to 2 billion years old. About 2 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 Hay Brook reaches the Gulf of America by way of the Knife, the Snake, the Saint Croix and the Mississippi: about 1,950 river miles.
Lakes on the way: Lake Pepin and Lake Mallalieu 175.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hay Brook; river miles along the main stem, rounded.
Hay Brook has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 0° in January. A normal year brings about 52 inches of snow; with the rain, that comes to about 32 inches of water.
On November 14 Hay Brook normally reaches 40° and falls to 23°. The record high is 72°, in 1999; the record low −5°, in 1919. The most rain on this date, 1.02 in, fell in 1909.
Normals 1991–2020 and records since 1904 at Mora, 15 miles south, 220 ft lower. NOAA, through RCC-ACIS.
