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A squall line is an elongated line of severe thunderstorms that can form along and/or ahead of a cold front. [11] [12] In the early 20th century, the term was used as a synonym for cold front. [13] The squall line contains heavy precipitation, hail, frequent lightning, strong straight-line winds, and possibly tornadoes and waterspouts. [14]
A weather radar image of a mesoscale convective vortex (MCV) over Pennsylvania with a leading squall line. A squall line, or quasi-linear convective system (QLCS), is a line of thunderstorms, often forming along or ahead of a cold front. In the early 20th century, the term was used as a synonym for cold front (which often are accompanied by ...
Of the four classifications of thunderstorms (supercell, squall line, multi-cell, and single-cell), supercells are the overall least common and have the potential to be the most severe. Supercells are often isolated from other thunderstorms, and can dominate the local weather up to 32 kilometres (20 mi) away. They tend to last 2–4 hours.
Lester C. Tichy (1905–1981) was a prolific 20th-century American architect and industrial designer.Tichy is perhaps best known for his association with the Pennsylvania Railroad, for which he created the infamous "Clamshell", an aluminum and steel canopy over the electronic ticketing area, in Penn Station’s Main Waiting Room in New York City.
The test measures a person's ability to match the angle and orientation of lines in space. [2] Subjects are asked to match two angled lines to a set of 11 lines that are arranged in a semicircle and separated 18 degrees from each other. [3] The complete test has 30 items, but short forms have also been created.
The ARL was established in 1945 by the U.S. Navy when the Harvard Underwater Sound Laboratory (USL) was terminated and its torpedo division was moved to Penn State. Eric Walker, the USL's assistant director, moved to Penn State to become its first director from 1945 until 1951, when he became the president of the university.