The Hagerstown 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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4.47 inches of rain fell in two days, the most for this week of the year since records began in 1949. The next wettest, 2.58 inches, fell in 1955.
Hagerstown’s center stands about 990 ft above sea level. Within three miles the land runs from 970 ft to 1,170 ft, a difference of 200 ft: 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.
Limestone, shale. Age: Ordovician, 445 to 487 million years old. About 10 mi of the line.
Limestone. Age: Silurian, 422 to 445 million years old. About 7 mi of the line.
Limestone, shale. Age: Ordovician, 445 to 487 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 Hagerstown reaches the Gulf of America by way of the Whitewater, the Great Miami, the Ohio and the Mississippi: about 1,550 river miles.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hagerstown; river miles along the main stem, rounded.
Hagerstown has a hot-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 17° in January. A normal year brings about 25 inches of snow; with the rain, that comes to about 44 inches of water.
On November 14 Hagerstown normally reaches 51° and falls to 31°. The record high is 78°, in 1955; the record low 6°, in 2019. The most rain on this date, 2.43 in, fell in 1993.
Normals 1991–2020 and records since 1949 at New Castle 3 SW, 13 miles west. NOAA, through RCC-ACIS.
