The Union 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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7.76 inches of rain fell in two days, the most for this week of the year since records began in 1973. The next wettest, 7.15 inches, fell in 2003.
Union’s center stands about 170 ft above sea level. Within three miles the land runs from 0 ft to 570 ft, a difference of 570 ft: hilly country. Open water lies within three miles. The highest named summit within 15 miles is Mount Washington, about 6,060 ft, 14 miles north-northwest.
Under the town center the state geologic map shows Younger glacial drift (fine-detrital, coarse-detrital), from the Pleistocene, less than 2.6 million years old.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 16×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Fine-detrital, coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 12 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.
Rain that falls on Union runs straight into Puget Sound and the Pacific Ocean.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Union; river miles along the main stem, rounded.
Union has a warm-summer Mediterranean climate. Summer afternoons average 76° in July; winter nights fall to about 35° in February. About 92 inches of rain fall in a normal year, with about 4 inches of snow.
On November 14 Union normally reaches 50° and falls to 39°. The record high is 65°, in 1995; the record low 25°, in 2014. The most rain on this date, 3.23 in, fell in 1975.
Normals 1991–2020 and records since 1973 at Cushman Powerhouse #2, 3 miles west-northwest, 150 ft lower. NOAA, through RCC-ACIS.
