The Alna 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.
Mostly cloudy
Partly cloudy; warmer
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67° on Nov. 11, 2020, the hottest reading for this week of the year since 1965. Next is 66° in 2022.
Alna’s center stands about 50 ft above sea level. Within three miles the land runs from 10 ft to 350 ft, a difference of 340 ft: rolling country. The highest named summit within 15 miles is Beech Hill, about 560 ft, 8 miles north-northwest.
Under the town center the state geologic map shows Ordovician - Precambrian Z Cape Elizabeth Formation (slate), from the Neoproterozoic to Ordovician, 445 to 1,000 million years old.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 45×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Slate. Age: Neoproterozoic to Ordovician, 445 to 1,000 million years old. About 23 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 Alna reaches the Atlantic Ocean by way of Trout Brook and the Sheepscot: about 25 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Alna; river miles along the main stem, rounded.
Alna has a warm-summer humid continental climate. Summer afternoons average 78° in July; winter nights fall to about 15° in January. A normal year brings about 79 inches of snow; with the rain, that comes to about 49 inches of water.
On November 14 Alna normally reaches 46° and falls to 33°. The record high is 62°, in 1973; the record low 11°, in 2019. The most rain on this date, 1.03 in, fell in 2006.
Normals 1991–2020 and records since 1965 at Newcastle, 5 miles southeast, 160 ft higher. NOAA, through RCC-ACIS.
