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A group of hikers encountering quicksand on the banks of the Paria River, Utah Quicksand warning sign near Lower King Bridge, Western Australia. Quicksand is a shear thinning non-Newtonian fluid: when undisturbed, it often appears to be solid ("gel" form), but a less than 1% change in the stress on the quicksand will cause a sudden decrease in its viscosity ("sol" form).
Near the Eastern Kentucky town of Quicksand experienced flash floods early July 28, 2022, following overnight rainfall. Home and structures are flooded near Quicksand, Ky., Thursday, July 28, 2022.
PDS warnings for other alerts occur with even less frequency, and their criteria varies depending on the alert type to which the wording is applied. [54] Until September 30, 2007, local offices of the National Weather Service issued warnings for severe thunderstorms, tornadoes, flash flooding and marine hazards using geopolitical boundaries.
Quicksand forms when water saturates an area of loose sand, and the sand is agitated. When the water trapped in the batch of sand cannot escape, it creates liquefied soil that can no longer resist force. Quicksand can be formed by standing or (upwards) flowing underground water (as from an underground spring), or by earthquakes.
The National Weather Service has issued a lake effect snow warning for portions of northwestern Pennsylvania and western New York, where locally 2 feet to 3 feet of snow is possible, forecasts show.
Map shows probability of a white Christmas How old is too old to be shoveling snow? "I wouldn't want to draw a line in the sand with an age cutoff," Gibbs said when asked who should and should not ...
Sleet warning WSW (alt.: heavy sleet warning) – Heavy sleet accumulations of 1 to 2 inches (2.5 to 5.1 cm) or more, which may cause significant disruptions to travel or utilities, are imminent or expected to occur within 12 hours. Discontinued beginning with the 2008-2009 winter storm season and replaced by the winter storm warning for heavy ...
Tornado warnings are still in effect across parts of Louisiana and Mississippi, and the threat continues overnight when tornadoes can often be their deadliest. (5:57 p.m. ET) Winds Top 80 MPH