The Allyn 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.
Showers likely
Showers likely
Chance of showers
Mostly sunny
Chance of showers
Partly cloudy
Partly cloudy
4.20 inches of rain fell in two days, the most for this week of the year since records began in 1899. The next wettest, 3.56 inches, fell in 1983.
Allyn’s center stands about 40 ft above sea level. Within three miles the land runs from 10 ft to 420 ft, a difference of 410 ft: hilly country. Open water lies within three miles. The highest named summit within 15 miles is Gold Mountain, about 1,770 ft, 11 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 26×. 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 8 mi of the line.
Fine-detrital, coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 2 mi of the line.
Basalt. Age: Early Paleocene to Middle Eocene, 40 to 64 million years old. About 0.4 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 Allyn reaches Puget Sound and the Pacific Ocean by way of Sherwood Creek: about 1 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Allyn; river miles along the main stem, rounded.
Allyn has a warm-summer Mediterranean climate. Summer afternoons average 77° in August; winter nights fall to about 35° in February. About 57 inches of rain fall in a normal year, with about 3 inches of snow.
On November 14 Allyn normally reaches 52° and falls to 39°. The record high is 68°, in 1901; the record low 12°, in 1955. The most rain on this date, 2.45 in, fell in 2001.
Normals 1991–2020 and records since 1899 at Bremerton, 14 miles north-northeast. NOAA, through RCC-ACIS.
