The Vernonia 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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11° on Nov. 12, 1985, the coldest reading for this week of the year since 1967. Next is 12° in 1978.
Vernonia’s center stands about 620 ft above sea level. Within three miles the land runs from 600 ft to 1,140 ft, a difference of 540 ft: hilly country. The highest named summit within 15 miles is Round Top, about 3,000 ft, 15 miles south-southwest.
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 11×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Mudstone. Age: Middle Eocene to Late Eocene, 34 to 48 million years old. About 12 mi of the line.
Sandstone, siltstone. Age: Late Eocene to Early Miocene, 16 to 38 million years old. About 8 mi of the line.
Basalt. Age: Miocene, 5.3 to 23 million years old. About 3 mi of the line.
Sand, gravel, silt. Age: Holocene, less than 12,000 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 Vernonia reaches the Pacific Ocean by way of the Nehalem: about 95 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Vernonia; river miles along the main stem, rounded.
Vernonia has a warm-summer Mediterranean climate. Summer afternoons average 78° in August; winter nights fall to about 31° in February. About 48 inches of rain fall in a normal year, with about 1 inch of snow.
On November 14 Vernonia normally reaches 51° and falls to 34°. The record high is 68°, in 1970; the record low 11°, in 1985. The most rain on this date, 1.45 in, fell in 1981.
Normals 1991–2020 and records since 1967 at Vernonia No. 2, here. NOAA, through RCC-ACIS.
