The Cathcart 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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5° on Nov. 15, 1955, the coldest reading for this week of the year since 1929. Next is 18° in 1978.
Cathcart’s center stands about 390 ft above sea level. Within three miles the land runs from 0 ft to 650 ft, a difference of 650 ft: hilly country. The highest named summit within 15 miles is Bald Hill, about 730 ft, 4 miles east-southeast.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 35×. 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 13 mi of the line.
Fine-detrital, coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 3 mi of the line.
Arkose. Age: Late Cretaceous to Eocene, 34 to 100 million years old. About 3 mi of the line.
Silt, sand. Age: Holocene, less than 12,000 years old. About 2 mi of the line.
Fine-detrital, coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 2 mi of the line.
Fine-detrital, coarse-detrital. Age: Late Pliocene to Pleistocene, less than 3.6 million years old. About 0.5 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 Cathcart reaches Puget Sound and the Pacific Ocean by way of the Snohomish: about 18 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Cathcart; river miles along the main stem, rounded.
Cathcart has a warm-summer Mediterranean climate. Summer afternoons average 75° in August; winter nights fall to about 31° in December. About 51 inches of rain fall in a normal year, with about 3 inches of snow.
On November 14 Cathcart normally reaches 49° and falls to 36°. The record high is 67°, in 1995; the record low 9°, in 1955. The most rain on this date, 1.92 in, fell in 2001.
Normals 1991–2020 and records since 1929 at Monroe, 5 miles east, 260 ft lower. NOAA, through RCC-ACIS.
