The Chackbay 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.
Sunny
Partly cloudy; warmer
Chance of showers
Partly cloudy
Partly cloudy
Partly cloudy
Mostly sunny
20° on Nov. 16, 1940, the coldest reading for this week of the year since 1893. Next is 24° in 1969.
Chackbay’s center stands about 12 ft above sea level. Within three miles the land runs from 0 ft to 70 ft, a difference of 70 ft: gently rolling country.
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 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Clay. Age: Holocene, less than 12,000 years old. About 14 mi of the line.
Silt, clay. Age: Holocene, less than 12,000 years old. About 7 mi of the line.
Clay. Age: Holocene, less than 12,000 years old. About 2 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 Chackbay reaches the Gulf of America by way of Grand Bayou, the Bayou Rond Pompon and the Bayou des Allemands: about 80 river miles.
Lake on the way: Lac des Allemands.
60 miles of the trip are on the Bayou des Allemands.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Chackbay; river miles along the main stem, rounded.
Chackbay has a humid subtropical climate. Summer afternoons average 92° in July; winter nights fall to about 44° in January. About 71 inches of rain fall in a normal year.
On November 14 Chackbay normally reaches 73° and falls to 52°. The record high is 88°, in 1909; the record low 27°, in 1907. The most rain on this date, 3.50 in, fell in 1914.
Normals 1991–2020 and records since 1893 at Thibodaux 4 SE, 9 miles south. NOAA, through RCC-ACIS.
