The Annapolis 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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8.48 inches of rain fell in two days, the most for this week of the year since records began in 1946. The next wettest, 4.29 inches, fell in 2015.
Annapolis’s center stands about 660 ft above sea level. Within three miles the land runs from 590 ft to 1,040 ft, a difference of 450 ft: hilly country. The highest named summit within 15 miles is Taum Sauk Mountain, about 1,800 ft, 15 miles north.
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 19×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Dolostone. Age: Cambrian, 487 to 497 million years old. About 18 mi of the line.
Dolostone, shale, siltstone. Age: Cambrian, 487 to 497 million years old. About 4 mi of the line.
Rhyolite. Age: Mesoproterozoic, 1 to 1.6 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 Annapolis reaches the Gulf of America by way of Big Creek, the Saint Francis and the Mississippi: about 1,040 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 Annapolis; river miles along the main stem, rounded.
Annapolis has a humid subtropical climate. Summer afternoons average 89° in July; winter nights fall to about 23° in January. About 49 inches of rain fall in a normal year.
On November 14 Annapolis normally reaches 58° and falls to 35°. The record high is 80°, in 1955; the record low 8°, in 1986. The most rain on this date, 0.90 in, fell in 1957.
Normals 1991–2020 and records since 1946 at Clearwater Dam, 16 miles south-southwest. NOAA, through RCC-ACIS.
