The Flournoy 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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24° on Nov. 13, 1985, the coldest reading for this week of the year since 1903. Next is 25° in 1978.
Flournoy’s center stands about 560 ft above sea level. Within three miles the land runs from 500 ft to 810 ft, a difference of 310 ft: rolling country. The highest named summit within 15 miles is All Top, about 5,160 ft, 15 miles west.
Under the town center the state geologic map shows Quaternary alluvium and marine deposits (coarse-detrital), from the Pleistocene to Holocene, less than 2.6 million years old.
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 6×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone, conglomerate. Age: Miocene to Pleistocene, less than 23 million years old. About 8 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 8 mi of the line.
Siltstone-mudstone. Age: Early Cretaceous, 113 to 145 million years old. About 3 mi of the line.
Siltstone-mudstone. Age: Late Jurassic to Early Cretaceous, 100 to 164 million years old. About 2 mi of the line.
Serpentinite. Age: Middle Jurassic to Late Jurassic, 145 to 175 million years old. About 2 mi of the line.
Greenstone. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 0.3 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 Flournoy reaches San Francisco Bay and the Pacific Ocean by way of Thomes Creek and the Sacramento: about 240 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Flournoy; river miles along the main stem, rounded.
Flournoy has a hot-summer Mediterranean climate. Summer afternoons average 94° in July; winter nights fall to about 37° in December. About 21 inches of rain fall in a normal year.
On November 14 Flournoy normally reaches 66° and falls to 43°. The record high is 83°, in 2013; the record low 25°, in 1985. The most rain on this date, 2.26 in, fell in 1953.
Normals 1991–2020 and records since 1903 at Orland, 17 miles southeast, 310 ft lower. NOAA, through RCC-ACIS.
